Article: 94696 of rec.radio.amateur.homebrew
From: "Ralph Mowery" <rmowery28146@earthlink.net>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com>
Subject: Re: 20meter propagation question...
Message-ID: <PSf7f.19552$QE1.776@newsread2.news.atl.earthlink.net>
Date: Tue, 25 Oct 2005 01:28:15 GMT


"J Shrum" <shrumj@madisontelco.com> wrote in message
news:u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com...
> Greetings. I've only been a ham for a couple years. Not really done
anything
> w/ it however. Just homebrewed a thing or two, but never made any QSO's. I
> just acquired a 5w 20m rig (all my budget could allow).
> Can someone give me any tips on how to know when 20m is open? What time of
> year or time of day is typically good for 20?
> I tried looking over some MUF charts... but its greek to me at this point.
> I've tried googling, but unless I know exactly how to phrase my search,
I'm
> coming up empty...
>
> Any pointers would be great.
> Thanks
> Jim
> KC9FFX
>

Turn the rig on and listen.  20 meters is open about any time of the year
especially during the daylight hours.




Article: 94697 of rec.radio.amateur.homebrew
From: "AG4QC" <Joel@cyberbest.com>
References: <QoQ6f.45$XE2.313475@news.sisna.com> <pan.2005.10.24.14.30.00.234000@fakeuniserve.com>
Subject: Re: Curtis 8044 keyer chip
Message-ID: <Sjf7f.47$Gp3.237712@news.sisna.com>
Date: Mon, 24 Oct 2005 19:50:52 -0500

Thanks to everyone.. I called MFJ and they didn't have a replacement chip... 
This is for a 422 keyer I bought off E-Bay  Of course, it was suppose to be 
working .. But it had a blown keyer chip.. It's on it's way back for a 
refund.. <shrug>

Yeah, I used the K-10 chip in a QRP rig a while ago. They have a nice 
product and it's small.. Actually I have the battery version of the K-12, 
(using a watch battery) mounted in a mouse that I use for QRP.. Talk about 
cool and easy to do!...

Joe  AG4QC

"Larry Gagnon" <lagagnon@fakeuniserve.com> wrote in message 
news:pan.2005.10.24.14.30.00.234000@fakeuniserve.com...
> On Sun, 23 Oct 2005 13:13:00 -0500, WildBlue wrote:
>
>> I have been looking high and low for a Curtis 8044 (16 pin) Keyer chip. 
>> I
>> can't seem to find one anywhere..
>>
>> Anyone have any ideas?
>>
>> Joe
>> AG4QC
>
> If you need a replacement the other poster gave you the details. But if
> you want a MUCH more powerful keyer chip, for less, try
> http://www.k1el.com
>
> Larry VE7EA 




Article: 94698 of rec.radio.amateur.homebrew
From: "AG4QC" <Joel@cyberbest.com>
References: <n9R6f.47$CY1.276622@news.sisna.com> <435BF1D1.8040207@invalid.invalid> <79fd8$435c058b$4232bd92$14023@COQUI.NET> <435CE593.2090101@invalid.invalid>
Subject: Re: EAS decoder..
Message-ID: <yvf7f.48$Yi.18451@news.sisna.com>
Date: Mon, 24 Oct 2005 20:03:22 -0500

Most of the radios I see have only warning watch and statement.. The Amber 
alerts come in as watches.. So you can't distinguish between them and normal 
weather warning..  My Midland model WR-100 has led's for the alert types so 
I am thinking about taking that voltage to start things off..  But I never 
thought about the amber alerts.. I know most people around here monitor the 
repeater around the clock.. I'm not sure how receptive they would be to a 
repeated amber alert at 2am.

Joe  AG4QC

"Doug Smith W9WI" <w9wi@invalid.invalid> wrote in message 
news:435CE593.2090101@invalid.invalid...
> Bill wrote:
>> Agreed.  Locally here they have been advertising EAS type consumer 
>> radios.  From what I gather from the blurb they seem like the real thing 
>> with programmable municipality codes, programmable to your choice of 
>> alert tones, etc.  I don't know what a S.A.M.E. is , maybe the same thing 
>> ?  (Oops, sri for the pun)
>
> <ouch!>
>
> S.A.M.E. = Specific Area Message Encoding.  It decodes the EAS bursts so 
> you can program it to only respond to alerts for your area, as opposed to 
> the older radios that keyed on the alert tone & would go off for 
> everything.
>
>> I haven't bothered to hear a brand name or price but I suspect its cheap 
>> enough to negate building your own from scratch.
>
> Radio Shack sells them, for well under $100.  However, the model I had can 
> only be programmed for location, not for alert type.  (i.e. you can 
> program which counties it'll go off for, but it'll go off for all types of 
> alert for those counties.  If they issue another Amber Alert at 3am I'm 
> going to turn the d*mned thing off...)
> -- 
> Doug Smith W9WI
> Pleasant View (Nashville), TN  EM66
> http://www.w9wi.com
> 




Article: 94699 of rec.radio.amateur.homebrew
Message-ID: <435DAFD5.8AA536F2@spamfree.com>
From: wendy <wendy_williams@spamfree.com>
Subject: Re: 20meter propagation question...
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com>
Date: Tue, 25 Oct 2005 04:08:56 GMT

hi jim,

you should be able to copy wwv at 14.000 mhz anytime,

what type of antenna are you using  (dipole, long wire)
tuner also ?  How high is your antenna ?

73 wendy


J Shrum wrote:

> Greetings. I've only been a ham for a couple years. Not really done anything
> w/ it however. Just homebrewed a thing or two, but never made any QSO's. I
> just acquired a 5w 20m rig (all my budget could allow).
> Can someone give me any tips on how to know when 20m is open? What time of
> year or time of day is typically good for 20?
> I tried looking over some MUF charts... but its greek to me at this point.
> I've tried googling, but unless I know exactly how to phrase my search, I'm
> coming up empty...
>
> Any pointers would be great.
> Thanks
> Jim
> KC9FFX



Article: 94700 of rec.radio.amateur.homebrew
Date: Tue, 25 Oct 2005 01:01:02 -0400
From: Bill <exray@coqui.net>
Subject: Re: 20meter propagation question...
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <435DAFD5.8AA536F2@spamfree.com>
Message-ID: <f31fe$435dbc10$4232bd43$7990@COQUI.NET>

wendy wrote:
> hi jim,
> 
> you should be able to copy wwv at 14.000 mhz anytime,

Ouch!  Try 15.000 Mhz.

-Bill


Article: 94701 of rec.radio.amateur.homebrew
From: nospam@nouce.bellatlantic.net
Subject: Re: Shunt feedback in broadband RF amps
Message-ID: <6v5sl11kbgh2e7k2enrq5quhtv0pj8ehki@4ax.com>
References: <1129701535.404399.192870@f14g2000cwb.googlegroups.com> <l5qajd.ne1.ln@tg6124.ab0wr.net> <1130224504.589121.286790@o13g2000cwo.googlegroups.com>
Date: Tue, 25 Oct 2005 11:51:42 GMT

Since your top posting...

The series C has enough reactance to be effective to fairly low
frequencies.   Consider that the 0.1uf cap seen has reactance of 
10ohms  around 150Khz thats insignificant compared to the resistor.
If the resistor is 1000 ohm then R=C around 2khz.  

What you have to ask is what frequency does the capacitors
reactance become equal to the series resistor?  For even a
.1uF cap that's a fairly low frequency.   I suspect not recognizing
that detail may be confusing.  As you get to very low frequencies
that cap may appear to be insignificant but those frequencies are
very low.

To appreciate that revisit those circuits in question and calculate
the capacitor Xc for 1khz, 10khz 100khz and 1Mhz.  

Allison

On 25 Oct 2005 00:15:04 -0700, meara.london@virgin.net wrote:

>Thanks to all who responded to my question.
>
>I went back and took a closer look at other editions of the Handbook,
>and at Solid State Design for the Radio Amateur (SSDRA).
>
>The Handbooks all seem to suggest that the shunt feedback networks
>using a resistor and a cap in series will somehow result in more
>negative feedback at lower frequencies.  Given that capacitive
>reactance varies inversely with freq, I still can't see how this
>happens. Tim's message seems to provide one possible explanation, but
>I'm kind of surprised that I haven't seen mention of this in the ham
>literature.
>
>When SSDRA discusses shunt feedback, (Chapter 8, page 188) they have a
>resistor, a blocking cap, and an inductor all in series between the
>collector and the base in a common emmiter amp. "The inductor has the
>effect of decreasing the feedback at high frequencies, while the 470
>ohm resistor is the dominant element at low frequencies."  That's easy
>to see.  But without the inductor (no inductor in the Handbook
>presentations) it is hard to see how this works.
>
>Thanks again to all,
>
>73  Bill  M0HBR  CU2JL N2CQR
>http://www.qsl.net/n2cqr
>
>tim gorman wrote:
>> meara.london@virgin.net wrote:
>>
>> >
>> >
>> > I'm having trouble understanding how the typical shunt feedback
>> > networks used in RF (solid state) amps work.  I'm looking at the 1993
>> > ARRL Handbook.   Typical common base broadband amp.  For the shunt
>> > feedback (from collector to base) they have two resistors: 560 ohms in
>> > series with 3300 ohms.  The 3300 ohm is bypassed by a .01 uf cap.
>> >
>> > So far so good.  But then the text explains that because you have
>> > rising gain characteristics when the frequency drops you need something
>> > to reduce gain at lower frequencies.  That's why the negative feedback
>> > helps.
>> >
>> > Here's where I'm having trouble: "As the operating frequency is
>> > decreased the negative feedback increases becasue the network feedback
>> > reactance becomes lower."  Huh?  Wouldn't that network's reactance
>> > INCREASE as frequency is lowered?  The only part of it with reactance
>> > is the .01 cap, correct?
>> >
>> > Help!  73!
>> >
>> > Bill M0HBR  N2CQR CU2JL
>> > http://www.qsl.net/n2cqr
>>
>> I think to actually figure this out you will need to write the gain transfer
>> equation for the amplifier. Many of the replies here are talking about an
>> RF amplifier but are analyzing the feedback at DC.
>>
>> Remember that the output of a transistor is NOT in phase with the input. As
>> the base voltage goes UP the collector voltage goes DOWN. (think of a
>> transistor used as a switch - when the base is biased off the no current
>> flows and the collector is at power supply potential - when the switch is
>> biased on then current flows and the collector is driven toward the
>> potential of the emitter -- i.e. the collector voltage goes down) For RF
>> the actual phase difference between input and output is dependent upon the
>> input and output impedances of the transistor as well as the gain transfer
>> characteristic (things like transit times of the current carriers and
>> junctions widths and all sorts of stuff figure in here). *THEN* you have to
>> consider the phase contribution of the RC network in the collector to base
>> network. At some RF frequency the collector is 180deg out of phase with the
>> input so a direct feedback link from the collector to the base would be
>> *negative*. It is quite possible that the phase relationships of this
>> particular amplifier are such that the negative feedback increases as the
>> frequency goes down.
>>
>> You would just have to write the equations and see where they take you.
>> 
>> tim ab0wr



Article: 94702 of rec.radio.amateur.homebrew
From: microwaves@blueyonder.co.uk (Peter)
Subject: Re: Putting the "Real" back into _REAL_ Ham Radio
Message-ID: <435e3ebe.14301885@news.blueyonder.co.uk>
References: <1129970452.489970.290430@g47g2000cwa.googlegroups.com> <435a0211$1_1@mk-nntp-2.news.uk.tiscali.com>
Date: Tue, 25 Oct 2005 14:20:25 GMT

On Sat, 22 Oct 2005 10:10:42 +0100, "realradioham"
<realradioham@tiscali.co.uk> wrote:

>I'm not a technical pursuit old boy...
>
>RRH
>"Polymath" <aiyr.r.bean@lycos.co.uk> wrote in message 
>news:1129970452.489970.290430@g47g2000cwa.googlegroups.com...
>> _REAL_ Ham Radio is a technical pursuit.
>>


Please don't  quote bean in full. Many of us have him in our killfiles
and we don't wish to see anything he's posted.


Article: 94703 of rec.radio.amateur.homebrew
From: microwaves@blueyonder.co.uk (Peter)
Subject: Re: Putting the "Real" back into _REAL_ Ham Radio
Message-ID: <435f3f00.14367779@news.blueyonder.co.uk>
References: <1129970452.489970.290430@g47g2000cwa.googlegroups.com> <gTOdne6vLo5vAMfeUSdV9g@ptd.net>
Date: Tue, 25 Oct 2005 14:21:29 GMT

On Sat, 22 Oct 2005 16:15:47 -0400, Bob Schreibmaier <k3ph@ptd.net>
wrote:

>The Armenian judges gave this a 9.8 on the Olympic Troll-O-Meter,
>but they were overruled by the umpires in instant replay, who
>awarded it a 2.6.


Bean eis not a troll.... just one very sick (in the mind) person..
just ignore him.


Article: 94704 of rec.radio.amateur.homebrew
From: "The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk>
Subject: Re: FAQ
Date: Tue, 25 Oct 2005 16:54:31 +0100
Message-ID: <djlkg8$8rh$1@newsg4.svr.pol.co.uk>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com>


> > Yet another reason I will never obtain a ham ticket.
>
> Good news for ham radio!

Yep, there will be no one left on Ham soon after all the old farts have
died...

> > You seem to think that
> > your little piece of paper raises your IQ.
>
> Yet with you cber IQ you couldn't pass the test even though the answers
> to the questions are available.

Try taking an IQ test and i bet theres hardly any difference between you and
most people on CB. The only test you would outshine most CBers would be
radio related...




Article: 94705 of rec.radio.amateur.homebrew
From: "William E. Sabin" <w.sabin@mchsi.com>
References: <1129701535.404399.192870@f14g2000cwb.googlegroups.com> <IlM5f.445451$x96.139037@attbi_s72>
Subject: Re: Shunt feedback in broadband RF amps
Message-ID: <h5t7f.274516$084.214715@attbi_s22>
Date: Tue, 25 Oct 2005 16:31:09 GMT

Here is a repeat of my previous input on this topic.

Bill W0IYH

"William E. Sabin" <w.sabin@mchsi.com> wrote in message 
news:IlM5f.445451$x96.139037@attbi_s72...
> The 1994 ARRL handbook, page 4-23, Fig 53C shows the feedback amplifier 
> that you describe.  However, it is a common-emitter circuit, not a 
> common-base circuit.  The 3300 ohm resistor returns to +12 V DC and 
> provides DC base current for the 2N5109.  The 0.01 uF bypass makes the 560 
> ohm resistor the main source of this feedback at radio frequencies.
>
> There are two kinds of feedback in the circuit.  One is the 560 ohms in 
> the base circuit.  The author calls this "negative feedback".  I call this 
> "voltage feedback". This feedback does not change very much over the HF 
> region.
>
> The other feedback (he calls it "degenerative feedback") is a 10 ohm 
> resistor in the emitter in series with a 100 resistor which is shunted by 
> 0.01uF.  I call this "current feedback".  This feedback increases at low 
> radio frequency because the impedance from emitter to ground increases at 
> low radio frequencies.  This is the feedback that the text is referring to 
> in the text and it is correct.  This kind of feedback increases at low 
> frequency.  If the 0.01 uF were replaced by a 1.0 uF this increase in 
> feedback would be a lot less at low radio frequencies.
>
> The author, probably DeMaw, got his terminology slightly mixed up but he 
> is referring to the emitter to ground current feedback, not the collector 
> to base voltage feedback.
>
> If you have a copy of the 2004 Handbook, chapter 17 has a sidebar 
> discussion of negative feedback that is interesting. Later editions may 
> have deleted it.
>
> Bill W0IYH
>
> <meara.london@virgin.net> wrote in message 
> news:1129701535.404399.192870@f14g2000cwb.googlegroups.com...
>> I'm having trouble understanding how the typical shunt feedback
>> networks used in RF (solid state) amps work.  I'm looking at the 1993
>> ARRL Handbook.   Typical common base broadband amp.  For the shunt
>> feedback (from collector to base) they have two resistors: 560 ohms in
>> series with 3300 ohms.  The 3300 ohm is bypassed by a .01 uf cap.
>>
>> So far so good.  But then the text explains that because you have
>> rising gain characteristics when the frequency drops you need something
>> to reduce gain at lower frequencies.  That's why the negative feedback
>> helps.
>>
>> Here's where I'm having trouble: "As the operating frequency is
>> decreased the negative feedback increases becasue the network feedback
>> reactance becomes lower."  Huh?  Wouldn't that network's reactance
>> INCREASE as frequency is lowered?  The only part of it with reactance
>> is the .01 cap, correct?
>>
>> Help!  73!
>>
>> Bill M0HBR  N2CQR CU2JL
>> http://www.qsl.net/n2cqr
>>
>
> 




Article: 94706 of rec.radio.amateur.homebrew
From: "Caveat Lector" <UALLBeware@9984reader.com>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com>
Subject: Re: 20meter propagation question...
Message-ID: <Blt7f.13869$i%.11388@fed1read07>
Date: Tue, 25 Oct 2005 09:48:49 -0700

You can tell where 20M is open world wide by using the NCDXF/IARU beacon 
system
See URL:
http://www.ncdxf.org/Beacon/intro.html

Specifically 14.100 MHz
If the morse code is too fast --

see URL:
http://www.ncdxf.org/Beacon/BeaconPrograms.html

For programs that will tell which beacons are transmitting

Be sure your computer clock is accurate to within a fraction of a second --  
See URL:
http://www.locutuscodeware.com/swatch.htm
-- 
CL -- I doubt, therefore I might be !






"J Shrum" <shrumj@madisontelco.com> wrote in message 
news:u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com...
> Greetings. I've only been a ham for a couple years. Not really done 
> anything
> w/ it however. Just homebrewed a thing or two, but never made any QSO's. I
> just acquired a 5w 20m rig (all my budget could allow).
> Can someone give me any tips on how to know when 20m is open? What time of
> year or time of day is typically good for 20?
> I tried looking over some MUF charts... but its greek to me at this point.
> I've tried googling, but unless I know exactly how to phrase my search, 
> I'm
> coming up empty...
>
> Any pointers would be great.
> Thanks
> Jim
> KC9FFX
> 




Article: 94707 of rec.radio.amateur.homebrew
From: <n5tde@earthlink.net>
Subject: Closing station, PCB shop, going QRT
Message-ID: <liA7f.229$m81.227@newsread1.news.atl.earthlink.net>
Date: Wed, 26 Oct 2005 00:42:57 GMT

For sale: 1) a complete computer controlled PCB machine, computer software,
manual, design software and manuals, all that is needed is a small air
compressor. Router bits and drills of misc. sizes. The machine is by T-Tech.
Does double sided with a .00008 offset resolution or better. I do not have
the thru hole plating, T-Tech works with you on that or rig your own.
Numerous support computers, the slowest 800 MHz 2) Icom 706 original, Icom
706 MkII GS, Kenwood 1000 general receiver, Kenwood TS450 (needs audio work)
spare 6146 finals, driver 12AT7, O'scope(TV repair 6MHz type), HP counter
says 50 MHZ top end, worked to 100Mhz with total accuracy, Kenwood 732A
2m/440 transceiver, HP7475 Plotter up to 18x24 multicolor, Heathkit Station:
SB101, SB600, SB200, swr,phone patch, HW160 minus top w/homemade power
supply, Two large air caps and roller inductor for unbilt matcher, MFJ dual
meter matcher, Kantronics KPC-3 with updated firmware complete APRS station,
Several audio I/O PCB 1 working proto for digital modes, 14 Mhz Psk31
transceiver QRP about 5 watts out, MFJ 160-6 matcher , 6 meter 3 ele. beam,
2 meter 4 elem. beam, J-pole, 440 6 element beam home design, Large
component collection in 50 bin cases, large SMT collection, proto kits
unused, 25 ea. ISD2560 voice chips, 30 2cx250s with sockets-or as a whole
about
15kw between 10 meter and 440mhz-(commercial RF shield testing of
helicopters). No power supply for it, Multitude of 110:24v 1amp ct. power
transformers. Fluke meter, old test equip: RF generator, Heath Gate dip osc
with all coils plus 440 coil, numerous meters etc. Web site all
documentation/support/financial etc., will sign noncompete agreement. Make
offer N5TDE@Gardcircuits.com




Article: 94708 of rec.radio.amateur.homebrew
From: <n5tde@earthlink.net>
References: <cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com>
Subject: Re: HF Power Amplifier
Message-ID: <5pA7f.234$m81.46@newsread1.news.atl.earthlink.net>
Date: Wed, 26 Oct 2005 00:50:09 GMT

1) what bands 2) what power 3) how much money do you want to spend? N5TDE
"Dennis, KA6GDT" <wdwyman@comcast.net> wrote in message
news:cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com...
> Can anyone direct me to an area where I could find plans and/or directions
> to construct a HF power amplifier?
>
>




Article: 94709 of rec.radio.amateur.homebrew
From: <n5tde@earthlink.net>
References: <jpvll1tsjafrmsgmoskph4td69hc88ccpt@4ax.com>
Subject: Re: High Q caps for 60 Khz loop antenna?
Message-ID: <esA7f.237$m81.72@newsread1.news.atl.earthlink.net>
Date: Wed, 26 Oct 2005 00:53:30 GMT

Someone tell Trabem about polystyrene and/or NPO disc please!!!!!!!!!! N5TDE

<TRABEM> wrote in message news:jpvll1tsjafrmsgmoskph4td69hc88ccpt@4ax.com...
> What caps should I use for a resonant loop antenna for VLF? I have
> some antenna plans and need .2 uf total capacitance to resonate a loop
> antenna at 60 Khz.
>
> I know I should avoid electrolytic and tantalum due to their poor
> temperature stability.
>
> Disc ceramics are so poor thermally that they are out of the question,
> especially since the caps are going to be outdoors.
>
> Silver Mica's are horribly expensive these days, and aren't available
> much past .01uf anyway.
>
> I have a Mouser catalog and plan to order from them soon, but it's not
> clear which type of cap I should order.
>
> Any suggestions for 50,000 pF caps that don't cost a fortune?
>
> Note that this is a receive only antenna so voltage rating and current
> carrying capacity are not an issue.
>
> Thanks.
>
> T




Article: 94710 of rec.radio.amateur.homebrew
Date: Tue, 25 Oct 2005 21:08:34 -0400
From: Bill <exray@coqui.net>
Subject: Re: High Q caps for 60 Khz loop antenna?
References: <jpvll1tsjafrmsgmoskph4td69hc88ccpt@4ax.com> <esA7f.237$m81.72@newsread1.news.atl.earthlink.net>
Message-ID: <d7185$435ed715$4232bd3b$24791@COQUI.NET>

n5tde@earthlink.net wrote:

> Someone tell Trabem about polystyrene and/or NPO disc please!!!!!!!!!! N5TDE

Where can you buy .2uf NP0 discs?

-Bill


Article: 94711 of rec.radio.amateur.homebrew
From: tim gorman <tgorman2@cox.net>
Subject: Re: Shunt feedback in broadband RF amps
References: <1129701535.404399.192870@f14g2000cwb.googlegroups.com> <l5qajd.ne1.ln@tg6124.ab0wr.net> <1130224504.589121.286790@o13g2000cwo.googlegroups.com>
Message-ID: <sirmjd.sg1.ln@tg6124.ab0wr.net>
Date: Tue, 25 Oct 2005 22:01:47 -0500

Again, the common emitter amplifier gives you 180deg of phase change. If
this were to be applied directly to the base of the transistor through only
a resistor, you would get direct cancellation at a level determnined by the
size of the resistor. The feedback network throws in a phase change
proportional to the tangent of the reactance and the resistance part of the
network. I think the tangent function for the feedback will look something
like:

            w(k1) / [k2 + w(k3)] 

where w is the radian freq. and k1, k2, and k3 are constants made up of R1,
R2, and C. k1 = C(R2)**2 or something like that.

As the freq goes up the phase change gets larger - i.e. it moves the phase
difference between the collector and the base away from 180deg., which
means less negative feedback. The maximum phase change contribution from
the RC network would be 45deg as w gets very, very large (arctan 1 = 45).
As the frequency goes down, the phase change contribution from the RC
circuit gets to be smaller and smaller which means the feedback moves
closer and closer to being 180deg - which means more negative feedback. (as
w approaches zero arctan 0 = 0)

This is probably only good for RF frequencies. Say, above 1Mhz. I would have
to actually write out the transfer characteristic and graph it to see
exactly what happens. Conceptually, it makes sense though.

tim ab0wr



meara.london@virgin.net wrote:

> 
> 
> Thanks to all who responded to my question.
> 
> I went back and took a closer look at other editions of the Handbook,
> and at Solid State Design for the Radio Amateur (SSDRA).
> 
> The Handbooks all seem to suggest that the shunt feedback networks
> using a resistor and a cap in series will somehow result in more
> negative feedback at lower frequencies.  Given that capacitive
> reactance varies inversely with freq, I still can't see how this
> happens. Tim's message seems to provide one possible explanation, but
> I'm kind of surprised that I haven't seen mention of this in the ham
> literature.
> 
> When SSDRA discusses shunt feedback, (Chapter 8, page 188) they have a
> resistor, a blocking cap, and an inductor all in series between the
> collector and the base in a common emmiter amp. "The inductor has the
> effect of decreasing the feedback at high frequencies, while the 470
> ohm resistor is the dominant element at low frequencies."  That's easy
> to see.  But without the inductor (no inductor in the Handbook
> presentations) it is hard to see how this works.
> 
> Thanks again to all,
> 
> 73  Bill  M0HBR  CU2JL N2CQR
> http://www.qsl.net/n2cqr
> 
> tim gorman wrote:
>> meara.london@virgin.net wrote:
>>
>> >
>> >
>> > I'm having trouble understanding how the typical shunt feedback
>> > networks used in RF (solid state) amps work.  I'm looking at the 1993
>> > ARRL Handbook.   Typical common base broadband amp.  For the shunt
>> > feedback (from collector to base) they have two resistors: 560 ohms in
>> > series with 3300 ohms.  The 3300 ohm is bypassed by a .01 uf cap.
>> >
>> > So far so good.  But then the text explains that because you have
>> > rising gain characteristics when the frequency drops you need something
>> > to reduce gain at lower frequencies.  That's why the negative feedback
>> > helps.
>> >
>> > Here's where I'm having trouble: "As the operating frequency is
>> > decreased the negative feedback increases becasue the network feedback
>> > reactance becomes lower."  Huh?  Wouldn't that network's reactance
>> > INCREASE as frequency is lowered?  The only part of it with reactance
>> > is the .01 cap, correct?
>> >
>> > Help!  73!
>> >
>> > Bill M0HBR  N2CQR CU2JL
>> > http://www.qsl.net/n2cqr
>>
>> I think to actually figure this out you will need to write the gain
>> transfer equation for the amplifier. Many of the replies here are talking
>> about an RF amplifier but are analyzing the feedback at DC.
>>
>> Remember that the output of a transistor is NOT in phase with the input.
>> As the base voltage goes UP the collector voltage goes DOWN. (think of a
>> transistor used as a switch - when the base is biased off the no current
>> flows and the collector is at power supply potential - when the switch is
>> biased on then current flows and the collector is driven toward the
>> potential of the emitter -- i.e. the collector voltage goes down) For RF
>> the actual phase difference between input and output is dependent upon
>> the input and output impedances of the transistor as well as the gain
>> transfer characteristic (things like transit times of the current
>> carriers and junctions widths and all sorts of stuff figure in here).
>> *THEN* you have to consider the phase contribution of the RC network in
>> the collector to base network. At some RF frequency the collector is
>> 180deg out of phase with the input so a direct feedback link from the
>> collector to the base would be *negative*. It is quite possible that the
>> phase relationships of this particular amplifier are such that the
>> negative feedback increases as the frequency goes down.
>>
>> You would just have to write the equations and see where they take you.
>> 
>> tim ab0wr



Article: 94712 of rec.radio.amateur.homebrew
From: "DrDeath" <drdeath555usb@yahoo.com>
Subject: Re: FAQ
Date: Tue, 25 Oct 2005 23:20:00 -0500
Message-ID: <11lu0vit6iemo2a@corp.supernews.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com>

"Cmdr Buzz Corey" <me@that.ten> wrote in message 
news:rPadnWnAaYiN1sDeRVn-pw@gbronline.com...
> DrDeath wrote:
>> "Jock." <real_classs_a@yahoo.co.uk> wrote in message 
>> news:56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com...
>>
>>>On Fri, 21 Oct 2005 19:11:52 +0100, "The Magnum"
>>><magnum@NOSPAMmag2781.freeserve.co.uk> wrote:
>>>
>>>
>>>>Hold about a bit matey boy... Just because someone uses a CB doesnt make
>>>>them a lower class person or less intellectual than an Amateur radio 
>>>>user.
>>>>They may have brains far exceeding yours on several topics, just not on
>>>>radio. Just because you know a bit about radio doesnt make you a higher
>>>>class of person... IT JUST MEANS YOU KNOW ABOUT RADIO'S..... now try
>>>>learning common sense, respect for ones fellow man and remember.. 
>>>>Amateur
>>>>Radio.. Just like CB.. is JUST A HOBBY...
>>>>I love the bit though where you say "it is neither my wish to insult 
>>>>them"
>>>>but you manage to do it anyhow...
>>>>10-4 over and out .. or in your case QRT..
>>>
>>>Another CB-er and potential F-class adherent.
>>>
>>>(You can spot them the minute they put finger to keyboard).
>>
>>
>> Yet another reason I will never obtain a ham ticket.
>
> Good news for ham radio!
>
>> You seem to think that your little piece of paper raises your IQ.
>
> Yet with you cber IQ you couldn't pass the test even though the answers to 
> the questions are available.

I have taken the sample test and passed. You only want to perpetuate the 
stereotype that CB ops are stupid. All you have proved to me is how stupid 
you are. 




Article: 94713 of rec.radio.amateur.homebrew
From: "DrDeath" <drdeath555usb@yahoo.com>
Subject: Re: FAQ
Date: Tue, 25 Oct 2005 23:24:40 -0500
Message-ID: <11lu184i0245b71@corp.supernews.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk>

"The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk> wrote in message 
news:djlkg8$8rh$1@newsg4.svr.pol.co.uk...
>
>> > Yet another reason I will never obtain a ham ticket.
>>
>> Good news for ham radio!
>
> Yep, there will be no one left on Ham soon after all the old farts have
> died...
>
>> > You seem to think that
>> > your little piece of paper raises your IQ.
>>
>> Yet with you cber IQ you couldn't pass the test even though the answers
>> to the questions are available.
>
> Try taking an IQ test and i bet theres hardly any difference between you 
> and
> most people on CB. The only test you would outshine most CBers would be
> radio related...
>
I doubt he knows as much about radio than I do. And from what I have read of 
his posts, his IQ is certainly lower than my 147 




Article: 94714 of rec.radio.amateur.homebrew
From: Roy Lewallen <w7el@eznec.com>
Subject: Re: High Q caps for 60 Khz loop antenna?
Date: Wed, 26 Oct 2005 00:18:42 -0700
Message-ID: <11lubej9h9gtmbb@corp.supernews.com>
References: <jpvll1tsjafrmsgmoskph4td69hc88ccpt@4ax.com> <esA7f.237$m81.72@newsread1.news.atl.earthlink.net> <d7185$435ed715$4232bd3b$24791@COQUI.NET> <k8vtl11b66bt5jtv3bjed58fl0j23hnbsk@4ax.com>

TRABEM wrote:
> On Tue, 25 Oct 2005 21:08:34 -0400, Bill <exray@coqui.net> wrote:
> 
> 
>>n5tde@earthlink.net wrote:
>>
>>
>>>Someone tell Trabem about polystyrene and/or NPO disc please!!!!!!!!!! N5TDE
>>
>>Where can you buy .2uf NP0 discs?
>>
> 
> 
> And, even if we could buy them, why would we use a disc ceramic cap in
> an environment that was not controlled due to stability issues?
> 
> I'm totally lost by the suggestion of a disc ceramic.

You shouldn't lump "ceramic cap" into a single group and assume it has 
one set of characteristics. There are many types of ceramic capacitors, 
with widely varying characteristics. The four most common groups are:

1. Hi-K. These are made with a class of ceramic having a very high 
dielectric constant. This results in physically small capacitors which 
are excellent for many RF applications such as bypassing. Their small 
physical size results in a high self resonant frequency for a given 
capacitance. The tradeoff is instability in nearly every other respect. 
They have a very high temperature coefficient, are sensitive to humidity 
and physical stress, and the capacitance varies with frequency and 
applied voltage. A common type is Z5U, which has a specified maximum 
capacitance change of +22 - 56% over the temperature range of +10 to +85 C.

2. "Temperature stable". These are made with ceramic which has 
considerably lower dielectric constant than used for the hi-k types. 
Consequently, they're larger for the same capacitance. Their temperature 
coefficient is much lower, and they're much less sensitive to other 
factors. They're good for many general purpose uses such as low- to 
moderate-Q filters and resonant circuits, coupling, and so forth. Q can 
be quite good. A common type is X7R, which has a specified maximum 
capacitance change of +/- 15% over the temperature range of -55 to +125 C.

3. Temperature compensating. These are much larger yet, being made from 
ceramics with a low and controlled temperature coefficient. They're 
typically very stable with respect to voltage, frequency, mechanical 
stress, and humidity. A common type is P2G (N150), which has a 
temperature coefficient of -150 +/-30 ppm/C.

4. NPO. (Common type is C0G.) These are made from a sandwich of two 
temperature compensating types with equal and opposite coefficients. 
They have excellent Q and are very stable. They're good for use in 
resonant circuits including oscillator tanks, high-Q filters, and other 
demanding applications. Q can be very good. A common type is C0G, which 
has a temperature coefficient of 0 +/-30 ppm/C.

NPO capacitors are substantially larger than "temperture stable" types, 
and much larger than hi-k types. You won't typically find them in large 
values.

Roy Lewallen, W7EL


Article: 94715 of rec.radio.amateur.homebrew
From: KE7CYW  <KE7CYW @yahoo.com>
Subject: Re: FAQ
Date: Wed, 26 Oct 2005 10:01:04 -0400
Message-ID: <ml2vl1p1td4sahb5r0v2abnc53pm2o3u4m@4ax.com>

Jock. <real_classs_a@yahoo.co.uk> wrote:
> On Fri, 21 Oct 2005 19:11:52 +0100, "The Magnum"
> <magnum@NOSPAMmag2781.freeserve.co.uk> wrote:
>
> >Hold about a bit matey boy... Just because someone uses a CB doesnt make
> >them a lower class person or less intellectual than an Amateur radio
> >user. They may have brains far exceeding yours on several topics, just
> >not on radio. Just because you know a bit about radio doesnt make you a
> >higher class of person... IT JUST MEANS YOU KNOW ABOUT RADIO'S..... now
> >try learning common sense, respect for ones fellow man and remember..
> >Amateur Radio.. Just like CB.. is JUST A HOBBY...
> >I love the bit though where you say "it is neither my wish to insult
> >them" but you manage to do it anyhow...
> >10-4 over and out .. or in your case QRT..
>
> Another CB-er and potential F-class adherent.
>
> (You can spot them the minute they put finger to keyboard).
>
Hey Jock, I found your picture on the web, you
look like a cock supporter.

http://static.flickr.com/4/4412967_7a90c34fe3_m.jpg

CB rules, and you hold cock.

_________________________________________
Usenet Zone Free Binaries Usenet Server
More than 140,000 groups
Unlimited download
http://www.usenetzone.com to open account


Article: 94716 of rec.radio.amateur.homebrew
From: "Caveat Lector" <UALLBeware@9984reader.com>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com>   <Blt7f.13869$i%.11388@fed1read07> <1130263534.713168.18350@g44g2000cwa.googlegroups.com>
Subject: Re: 20meter propagation question...
Message-ID: <e5M7f.13945$i%.193@fed1read07>
Date: Wed, 26 Oct 2005 07:08:28 -0700

Unlike 6M beacons which transmit continously on a specific frequency, the 
NCDXF/IARU Beacon system has 18 beacons around the world transmitting on the 
same frequency in rotation. Please read URL:
http://www.ncdxf.org/Beacon/BeaconSchedule.html

You do not need to copy the beacon ID in Morse code, programs are available 
to ID the beacon transmitting. The program does not read the code, rather it 
is time based. That is your computer clock is precisely on time and the 
beacons are precisely on time also. The program shows a world map and which 
beacon is currently transmitting

The NCDXF/IARU system is a great propagation aid real time -- world wide.

Further there are beacons systems on 14.100, 18.110, 21.150, 24.930, and 
28.200 megaHertz.

-- 
CL -- I doubt, therefore I might be !


"an_old_friend" <konstans@hotmail.com> wrote in message 
news:1130263534.713168.18350@g44g2000cwa.googlegroups.com...
>
> Caveat Lector wrote:
>> You can tell where 20M is open world wide by using the NCDXF/IARU beacon
>> system
>> See URL:
>> http://www.ncdxf.org/Beacon/intro.html
>>
>> Specifically 14.100 MHz
>> If the morse code is too fast --
>
> you need to read the code if the question is the band open at all
>
> indeed I listen for beacons on 6m myself and code at any speed is too
> fast but if I can hear em esp if I can a bunch of em the band my well
> be open enough to use
>>
>> see URL:
>> http://www.ncdxf.org/Beacon/BeaconPrograms.html
>>
>> For programs that will tell which beacons are transmitting
>>
>> Be sure your computer clock is accurate to within a fraction of a 
>> second --
>> See URL:
>> http://www.locutuscodeware.com/swatch.htm
>> --
>> CL -- I doubt, therefore I might be !
>>
>>
>>
>>
>>
>>
>> "J Shrum" <shrumj@madisontelco.com> wrote in message
>> news:u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com...
>> > Greetings. I've only been a ham for a couple years. Not really done
>> > anything
>> > w/ it however. Just homebrewed a thing or two, but never made any 
>> > QSO's. I
>> > just acquired a 5w 20m rig (all my budget could allow).
>> > Can someone give me any tips on how to know when 20m is open? What time 
>> > of
>> > year or time of day is typically good for 20?
>> > I tried looking over some MUF charts... but its greek to me at this 
>> > point.
>> > I've tried googling, but unless I know exactly how to phrase my search,
>> > I'm
>> > coming up empty...
>> >
>> > Any pointers would be great.
>> > Thanks
>> > Jim
>> > KC9FFX
>> >
> 




Article: 94717 of rec.radio.amateur.homebrew
From: "Caveat Lector" <UALLBeware@9984reader.com>
References: <cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com> <f-idndYb6f5iOcLenZ2dnUVZ_s6dnZ2d@iswest.net>
Subject: Re: HF Power Amplifier
Message-ID: <UIN7f.13956$i%.8334@fed1read07>
Date: Wed, 26 Oct 2005 08:59:01 -0700

Try URL:

http://ac6v.com/techref.htm#AMP

Several homebrew projects there
-- 
CL -- I doubt, therefore I might be !


> Dennis, KA6GDT wrote:
>> Can anyone direct me to an area where I could find plans and/or 
>> directions to construct a HF power amplifier?




Article: 94718 of rec.radio.amateur.homebrew
From: "Asimov" <Asimov@-removethis-bbs.juxtaposition.dynip.com>
Subject: Re: High Q caps for 60 Khz loop antenna?
Message-ID: <MSGID_1=3a167=2f133.0_435f81eb@fidonet.org>
References: <d7185$435ed715$4232bd3b$24791@COQUI.NET>
Date: Wed, 26 Oct 2005 16:11:07 GMT

"Bill" bravely wrote to "All" (25 Oct 05  21:08:34)
 --- on the heady topic of "Re: High Q caps for 60 Khz loop antenna?"

 Bi> From: Bill <exray@coqui.net>
 Bi> Xref: core-easynews rec.radio.amateur.homebrew:88513

 Bi> n5tde@earthlink.net wrote:

 > Someone tell Trabem about polystyrene and/or NPO disc please!!!!!!!!!! N5TDE

 Bi> Where can you buy .2uf NP0 discs?

 Bi> -Bill

How about 10 of 0.02uF?

 A*s*i*m*o*v

... "If it ain't broke, you're not tryin!" - Red Green



Article: 94719 of rec.radio.amateur.homebrew
From: Larry Gagnon <lagagnon@fakeuniserve.com>
Subject: Re: 20meter propagation question...
Date: Wed, 26 Oct 2005 09:15:01 -0700
Message-ID: <pan.2005.10.26.16.15.01.557456@fakeuniserve.com>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com>

On Mon, 24 Oct 2005 19:51:54 -0500, J Shrum wrote:

> Greetings. I've only been a ham for a couple years. Not really done anything
> w/ it however. Just homebrewed a thing or two, but never made any QSO's. I
> just acquired a 5w 20m rig (all my budget could allow).
> Can someone give me any tips on how to know when 20m is open? What time of
> year or time of day is typically good for 20?

Jim: 20M usually has signals readable almost ANY day from 6AM to 7PM from
all over North America and sometimes beyond. Only in the worst propagation
conditions can you not hear any signals.

I suspect one of 3 things if you are asking this question:

1) you don't get on the air enough and listen for signals
2) your antenna is very bad, untuned, or in mineshaft
3) your receiver is almost dead.

Check the band more often, check your antenna and check your receiver.

Larry VE7EA
  


Article: 94720 of rec.radio.amateur.homebrew
From: "Caveat Lector" <UALLBeware@9984reader.com>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <pan.2005.10.26.16.15.01.557456@fakeuniserve.com> <PY-dnYG7AfJ8TMLeRVn-sQ@madisontelco.com>
Subject: Re: 20meter propagation question...
Message-ID: <_nQ7f.13973$i%.2620@fed1read07>
Date: Wed, 26 Oct 2005 12:01:32 -0700

LISTEN TO THE NCDXF/IARU BEACONS -- THEY RUN 24 HOURS A DAY

-- 
CL -- I doubt, therefore I might be !






"J Shrum" <shrumj@madisontelco.com> wrote in message 
news:PY-dnYG7AfJ8TMLeRVn-sQ@madisontelco.com...
> Thanks for all the replies folks... I work during the day, and haven't 
> really been listening except later in the night... so that would explain 
> why its so quiet at night. I took a quick listen during the day today... 
> and oh yeah, big difference.
>
> Thanks for the help folks..
>
>
>
> "Larry Gagnon" <lagagnon@fakeuniserve.com> wrote in message 
> news:pan.2005.10.26.16.15.01.557456@fakeuniserve.com...
>> On Mon, 24 Oct 2005 19:51:54 -0500, J Shrum wrote:
>>
>>> Greetings. I've only been a ham for a couple years. Not really done 
>>> anything
>>> w/ it however. Just homebrewed a thing or two, but never made any QSO's. 
>>> I
>>> just acquired a 5w 20m rig (all my budget could allow).
>>> Can someone give me any tips on how to know when 20m is open? What time 
>>> of
>>> year or time of day is typically good for 20?
>>
>> Jim: 20M usually has signals readable almost ANY day from 6AM to 7PM from
>> all over North America and sometimes beyond. Only in the worst 
>> propagation
>> conditions can you not hear any signals.
>>
>> I suspect one of 3 things if you are asking this question:
>>
>> 1) you don't get on the air enough and listen for signals
>> 2) your antenna is very bad, untuned, or in mineshaft
>> 3) your receiver is almost dead.
>>
>> Check the band more often, check your antenna and check your receiver.
>>
>> Larry VE7EA
>>
>
> 




Article: 94721 of rec.radio.amateur.homebrew
From: Roy Lewallen <w7el@eznec.com>
Subject: Re: High Q caps for 60 Khz loop antenna?
Date: Wed, 26 Oct 2005 14:08:12 -0700
Message-ID: <11lvs1tc16ukv3a@corp.supernews.com>
References: <jpvll1tsjafrmsgmoskph4td69hc88ccpt@4ax.com> <esA7f.237$m81.72@newsread1.news.atl.earthlink.net> <d7185$435ed715$4232bd3b$24791@COQUI.NET> <k8vtl11b66bt5jtv3bjed58fl0j23hnbsk@4ax.com> <11lubej9h9gtmbb@corp.supernews.com>

I want to thank Tom Bruhns for sending me some corrections to my rather 
outdated information about NPO capacitors. First, they're no longer 
being made as a sandwich of two ceramic types as I said, but with a 
single ceramic. Second, they're now available in quite large values -- 
Tom points out that AVX has them up to 0.1 uF in 1812 SMT size. Finally, 
here's some information Tom sent from an AVX data sheet that gives some 
additional quantitative information about the characteristics of these 
parts:

---------

C0G (NP0) is the most popular formulation of the “temperature-
compensating,” EIA Class I ceramic materials. Modern
C0G (NP0) formulations contain neodymium, samarium and
other rare earth oxides.
C0G (NP0) ceramics offer one of the most stable capacitor
dielectrics available. Capacitance change with temperature
is 0 ±30ppm/°C which is less than ±0.3% Δ C from -55°C
to +125°C. Capacitance drift or hysteresis for C0G (NP0)
ceramics is negligible at less than ±0.05% versus up to
±2% for films. Typical capacitance change with life is less
than ±0.1% for C0G (NP0), one-fifth that shown by most
other dielectrics. C0G (NP0) formulations show no aging
characteristics.
The C0G (NP0) formulation usually has a “Q” in excess
of 1000 and shows little capacitance or “Q” changes with
frequency. Their dielectric absorption is typically less than
0.6% which is similar to mica and most films.

---------

As you can see from the characteristics, modern NPO ceramic capacitors 
can be used for very demanding applications, and are often the best choice.

Roy Lewallen, W7EL

Roy Lewallen wrote:

> . . .
> 
> 4. NPO. (Common type is C0G.) These are made from a sandwich of two 
> temperature compensating types with equal and opposite coefficients. 
> They have excellent Q and are very stable. They're good for use in 
> resonant circuits including oscillator tanks, high-Q filters, and other 
> demanding applications. Q can be very good. A common type is C0G, which 
> has a temperature coefficient of 0 +/-30 ppm/C.
> 
> NPO capacitors are substantially larger than "temperture stable" types, 
> and much larger than hi-k types. You won't typically find them in large 
> values.


Article: 94722 of rec.radio.amateur.homebrew
From: "T.E.O" <rfmscpa@earthlink.net>
References: <cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com>
Subject: Re: HF Power Amplifier
Message-ID: <amU7f.2279$yX2.908@newsread2.news.pas.earthlink.net>
Date: Wed, 26 Oct 2005 23:32:22 GMT

http://www.somis.org/perfect_amp.html



"Dennis, KA6GDT" <wdwyman@comcast.net> wrote in message
news:cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com...
> Can anyone direct me to an area where I could find plans and/or directions
> to construct a HF power amplifier?
>
>




Article: 94723 of rec.radio.amateur.homebrew
From: "T.E.O" <rfmscpa@earthlink.net>
References: <cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com>
Subject: Re: HF Power Amplifier
Message-ID: <4oU7f.2280$yX2.354@newsread2.news.pas.earthlink.net>
Date: Wed, 26 Oct 2005 23:34:24 GMT

http://oak.cats.ohiou.edu/~postr/bapix/813amp.htm




"Dennis, KA6GDT" <wdwyman@comcast.net> wrote in message
news:cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com...
> Can anyone direct me to an area where I could find plans and/or directions
> to construct a HF power amplifier?
>
>




Article: 94724 of rec.radio.amateur.homebrew
From: "Dan/W4NTI" <w4nti@mindNOSPAMATALLspring.com>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <435DAFD5.8AA536F2@spamfree.com>
Subject: Re: 20meter propagation question...
Message-ID: <iPV7f.1665$AS6.301@newsread3.news.atl.earthlink.net>
Date: Thu, 27 Oct 2005 01:11:42 GMT

Sorry Wendy... must of been a typo, right?   WWV is on 15 Mhz.

Dan/W4NTI

"wendy" <wendy_williams@spamfree.com> wrote in message 
news:435DAFD5.8AA536F2@spamfree.com...
> hi jim,
>
> you should be able to copy wwv at 14.000 mhz anytime,
>
> what type of antenna are you using  (dipole, long wire)
> tuner also ?  How high is your antenna ?
>
> 73 wendy
>
>
> J Shrum wrote:
>
>> Greetings. I've only been a ham for a couple years. Not really done 
>> anything
>> w/ it however. Just homebrewed a thing or two, but never made any QSO's. 
>> I
>> just acquired a 5w 20m rig (all my budget could allow).
>> Can someone give me any tips on how to know when 20m is open? What time 
>> of
>> year or time of day is typically good for 20?
>> I tried looking over some MUF charts... but its greek to me at this 
>> point.
>> I've tried googling, but unless I know exactly how to phrase my search, 
>> I'm
>> coming up empty...
>>
>> Any pointers would be great.
>> Thanks
>> Jim
>> KC9FFX
> 




Article: 94725 of rec.radio.amateur.homebrew
From: "David  Thompson" <thompson@mindspring.com>
Subject: Problem with soldering gun
Message-ID: <XhZ7f.712$2y.119@newsread2.news.atl.earthlink.net>
Date: Thu, 27 Oct 2005 05:09:11 GMT

My sister bought me a Radio Shack Dual Heat soldering gun (150W/230W).  This
was to supplement
my 120 watt 45 year old Weller.  This after my WW II vintage 120 iron died
on me.

My main use was to solder coax connectors.  The Gun seems to work Ok on
soldering joints in say a SB220 amplifier.  But the first thing I noticed is
that the tip is much to large to fit into the area where the PL-259 outside
allows you to solder that to the shield thru the wholes in the 259.  No
problem but if you leave the gun on too long the area of the tip gets red
hot about 1/2" back from the actual tip.

My old Weller does a better but inadequate job of soldering the 259 shield.

Why does the gun allow the tip to get red hot away from the actual tip.  The
tip is almost new.  I notice its made from a silver metal not copper as with
most Weller tips.  Radio Shack tells me its made by Weller
and they are not aware of the problem.

bad tip or maybe a bad winding in the gun?  any ideas?

Dave K4JRB




Article: 94726 of rec.radio.amateur.homebrew
Message-ID: <43607616$0$5437$626a14ce@news.free.fr>
From: F8BOE <f8boe@bluemail.ch>
Subject: Re: Problem with soldering gun
Date: Thu, 27 Oct 2005 08:39:56 +0200
References: <XhZ7f.712$2y.119@newsread2.news.atl.earthlink.net>

Hello,

It may sound funny, but that's why I never used a soldering gun and perhaps
never will... My 25W JBC with 0.8 and 1.2 mm tips is quite fine for
electronic components and connector soldering.

You should be the one who takes an 18 wheeler to pick up a beer pack.
Shouldn't you? Perhaps a Mig welder could do the connector job... Hi!
I hope you'll never mount connectors for other Hams without any serious DC
and HF shortcut tests.

100W+ soldering irons are pretty good for plumber jobs or for desoldering
fast and clean, but definitely not for your aim.

73 de F8BOE Olivier ...-.-



David  Thompson wrote:

> My sister bought me a Radio Shack Dual Heat soldering gun (150W/230W). 
> This was to supplement
> my 120 watt 45 year old Weller.  This after my WW II vintage 120 iron died
> on me.
> 
> My main use was to solder coax connectors.  The Gun seems to work Ok on
> soldering joints in say a SB220 amplifier.  But the first thing I noticed
> is that the tip is much to large to fit into the area where the PL-259
> outside
> allows you to solder that to the shield thru the wholes in the 259.  No
> problem but if you leave the gun on too long the area of the tip gets red
> hot about 1/2" back from the actual tip.
> 
> My old Weller does a better but inadequate job of soldering the 259
> shield.
> 
> Why does the gun allow the tip to get red hot away from the actual tip. 
> The
> tip is almost new.  I notice its made from a silver metal not copper as
> with
> most Weller tips.  Radio Shack tells me its made by Weller
> and they are not aware of the problem.
> 
> bad tip or maybe a bad winding in the gun?  any ideas?
> 
> Dave K4JRB



Article: 94727 of rec.radio.amateur.homebrew
Message-ID: <4360DD5F.6080400@invalid.invalid>
From: Doug Smith W9WI <w9wi@invalid.invalid>
Subject: Re: Problem with soldering gun
References: <XhZ7f.712$2y.119@newsread2.news.atl.earthlink.net> <43607616$0$5437$626a14ce@news.free.fr>
Date: Thu, 27 Oct 2005 14:00:07 GMT

F8BOE wrote:
 >>My main use was to solder coax connectors.  The Gun seems to work Ok on

> 100W+ soldering irons are pretty good for plumber jobs or for desoldering
> fast and clean, but definitely not for your aim.

??!!

Well, maybe if Dave's doing BNCs or N connectors then a 100W+ unit is 
too big.  But "...of soldering the 259 shield.", PL-259s are a 
completely different case.  I had a 70/140W "dual-power" gun, and it 
really wasn't adequate for doing PL-259s.

Managed to find a 200W+ Weller at a Lowe's store in Clarksville, and it 
does the trick.  You've really GOT to have that heat, a PL-259 shell is 
an awfully good heat sink...

 >>Why does the gun allow the tip to get red hot away from the actual tip.

Mine doesn't, though it does get hot enough to melt solder a fair 
distance from the actual tip.  I guess I expected that.

First thing I'd suspect, especially if you're having trouble soldering 
PL-259s with a 230W gun, is that the tips aren't making adequate contact 
with the secondary of the transformer, the metal tubes coming out of the 
handle.  At the risk of stating the obvious, those little nuts at the 
end of the tubes are good and tight, right?

 >tip is almost new.  I notice its made from a silver metal not copper 
as with most Weller tips.

The tips for mine are silver in color.  I guess I figured they were 
tinned copper but could be wrong.

-- 
Doug Smith W9WI
Pleasant View (Nashville), TN  EM66
http://www.w9wi.com



Article: 94728 of rec.radio.amateur.homebrew
From: "DrDeath" <drdeath555usb@yahoo.com>
Subject: Re: FAQ
Date: Thu, 27 Oct 2005 11:03:45 -0500
Message-ID: <11m1uj3tniis6b5@corp.supernews.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com>

"Cmdr Buzz Corey" <me@that.ten> wrote in message 
news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
> DrDeath wrote:
>>
>> I doubt he knows as much about radio than I do. And from what I have read 
>> of his posts, his IQ is certainly lower than my 147
> 147? Yeah right.

I realize that it is hard for you to comprehend that, with me being a CBer. 
Challenging a belief system can be tough. Like your belief that all CBers 
are to stupid to pass the ham test, that we sit around all day swilling beer 
and saying "ten-fer good buddy". Or my favorite belief you hold, "I have a 
ham ticket, that makes me special." 




Article: 94729 of rec.radio.amateur.homebrew
From: "Harold E. Johnson" <w4zcb@mchsi.com>
References: <XhZ7f.712$2y.119@newsread2.news.atl.earthlink.net> <43607616$0$5437$626a14ce@news.free.fr> <4360DD5F.6080400@invalid.invalid>
Subject: Re: Problem with soldering gun
Message-ID: <e278f.519660$xm3.414290@attbi_s21>
Date: Thu, 27 Oct 2005 16:15:06 GMT

A trick demonstrated to me by a friend in New Mexico. (I use "N"'s and it 
doesn't bother me, but he was putting a 259 on a piece of coax and managed 
to amaze me.) You use a soldering gun, but with NO tip at all! He pushed the 
gun sans tip into the ring where the holes for the solder to the braid are, 
and pulled the trigger. In very little time, the I*I*R losses had the 259 
hot enough to melt solder and he flowed it into the braid. Gets the heat 
into the right place, Give it a try.

W4ZCB 




Article: 94730 of rec.radio.amateur.homebrew
From: "The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk>
Subject: Re: FAQ
Date: Thu, 27 Oct 2005 17:28:24 +0100
Message-ID: <djqv7i$lh6$1@newsg1.svr.pol.co.uk>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com>


"DrDeath" <drdeath555usb@yahoo.com> wrote in message
news:11m1uj3tniis6b5@corp.supernews.com...
> "Cmdr Buzz Corey" <me@that.ten> wrote in message
> news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
> > DrDeath wrote:
> >>
> >> I doubt he knows as much about radio than I do. And from what I have
read
> >> of his posts, his IQ is certainly lower than my 147
> > 147? Yeah right.
>
> I realize that it is hard for you to comprehend that, with me being a
CBer.
> Challenging a belief system can be tough. Like your belief that all CBers
> are to stupid to pass the ham test, that we sit around all day swilling
beer
> and saying "ten-fer good buddy". Or my favorite belief you hold, "I have a
> ham ticket, that makes me special."

Why on earth would anyone want to pass an Amateur test to talk to guys like
this is beyond me. At least with CB you can have a laugh and also use it
sensibly without having to dedicate your whole life to the bloody thing....
Those people who look down on CB because they are amateurs really...really
need to get out and experience some life..... and i dont mean down to the
ham rallys to buy some more of someones junk to fill their houses with. Not
all Amateurs are like this but theres a lot that are, and a lot of them sit
in these newsgroups trying to prove something. Sad old farts....




Article: 94731 of rec.radio.amateur.homebrew
From: Jock. <real_classs_a@yahoo.co.uk>
Subject: Re: FAQ
Date: Thu, 27 Oct 2005 16:44:42 +0000
Message-ID: <uu02m1pacuecg6k3fphacaqvo5fna8lh63@4ax.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com>

On Thu, 27 Oct 2005 11:03:45 -0500, "DrDeath" <drdeath555usb@yahoo.com> wrote:

>"Cmdr Buzz Corey" <me@that.ten> wrote in message 
>news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
>> DrDeath wrote:
>>>
>>> I doubt he knows as much about radio than I do. And from what I have read 
>>> of his posts, his IQ is certainly lower than my 147
>> 147? Yeah right.
>
>I realize that it is hard for you to comprehend that, with me being a CBer. 
>Challenging a belief system can be tough. Like your belief that all CBers 
>are to stupid to pass the ham test, that we sit around all day swilling beer 
>and saying "ten-fer good buddy". Or my favorite belief you hold, "I have a 
>ham ticket, that makes me special." 

Any moron can pick up a microphone.

-- 

73 de Jock.

Old Glory - a common misspelling. Only the first "l"
is necessary.


Article: 94733 of rec.radio.amateur.homebrew
From: bigamps <bigamps@louder.still.net>
Subject: Re: FAQ
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com>
Message-ID: <JF78f.511$lg.48@news01.roc.ny>
Date: Thu, 27 Oct 2005 16:57:13 GMT

DrDeath wrote:
> "Cmdr Buzz Corey" <me@that.ten> wrote in message 
> news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
> 
>>DrDeath wrote:
>>
>>>I doubt he knows as much about radio than I do. And from what I have read 
>>>of his posts, his IQ is certainly lower than my 147
>>
>>147? Yeah right.
> 
> 
> I realize that it is hard for you to comprehend that, with me being a CBer. 
> Challenging a belief system can be tough. Like your belief that all CBers 
> are to stupid...
         ^^

147?


Article: 94734 of rec.radio.amateur.homebrew
From: et472@FreeNet.Carleton.CA (Michael Black)
Subject: Re: Problem with soldering gun
Date: 27 Oct 2005 16:58:07 GMT
Message-ID: <djr0uv$ilq$1@theodyn.ncf.ca>
References: <XhZ7f.712$2y.119@newsread2.news.atl.earthlink.net> <43607616$0$5437$626a14ce@news.free.fr> <4360DD5F.6080400@invalid.invalid>


Doug Smith W9WI (w9wi@invalid.invalid) writes:
> 

> First thing I'd suspect, especially if you're having trouble soldering 
> PL-259s with a 230W gun, is that the tips aren't making adequate contact 
> with the secondary of the transformer, the metal tubes coming out of the 
> handle.  At the risk of stating the obvious, those little nuts at the 
> end of the tubes are good and tight, right?
> 
And maybe more important, the nuts can be tight but the copper is still
not making good contact.  Loosening the nuts and retightening is important
in this case.

I've not bought a tip for mine in thirty years (which means I only bought
them for a couple of years).  Someone gave me a yard or so of multi-strand
wire left over from a TV transmitter installation, the punchline being
that each strand was the diameter of the wire used for the soldering
gun tips.  I measured the real tip, and used it as a template to cut
the wire to the needed size. It's all worked fine, and the fact
that it's not plated doesn't really matter because the tips don't cost
me a thing.  That yard of wire is still supplying the tips.


   Michael  VE2BVW



Article: 94735 of rec.radio.amateur.homebrew
From: James Skalski <jskalski@yahoo.com>
Subject: VNA and tank circuits?
Message-ID: <gQ88f.5702$0V6.3968@trndny06>
Date: Thu, 27 Oct 2005 18:16:44 GMT

Has anyone used a VNA to set up taps on an amplifier tank circuit or 
used one to set up taps on a coil in a transmatch? Maybe a small 
capacitor on the anode lead instead of the finals to match capacitance 
and then measure from the output of the amplifier with antenna relays in 
"on" position. (no other power to the amp :)
I am thinking that the caps can be set to expected  mid band capacitance 
for each band. Then work on the inductor taps to get the plate impedance.
Or should I just measure the inductor and make the taps based on the 
inductance measurement? It seems that if the tank circuit parts were in 
place the taps would be more accurate.
I am looking for a tutorial for non engineer types. (tards :))
or a simple explanation. Step by step would be nice.
This is the hard part about making an amp? right? I mean besides the 
drilling and metal cutting, and locating parts. Maybe others might be 
helped as well by a good explanation.
Jim n2go


Article: 94736 of rec.radio.amateur.homebrew
From: "Steve Nosko" <suteuve.nosukowicuz@moutouroula.com>
Subject: Re: Problem with soldering gun
Date: Thu, 27 Oct 2005 13:17:39 -0500
Message-ID: <djr5k3$imp$1@engnntp2.cig.mot.com>
References: <XhZ7f.712$2y.119@newsread2.news.atl.earthlink.net>   <43607616$0$5437$626a14ce@news.free.fr>   <4360DD5F.6080400@invalid.invalid> <1130431775.836010.79240@g43g2000cwa.googlegroups.com>

Two good posts below, HOWEVER...


Guns, in general, should not be used for PL259s -- though W4ZCB's method is
a good one.  I have used this technique in the past, but don't
recallspecificlly on what, just that is was a massive solderiang job.  I
also have a device, resistance solderer, that designed to do this and is
used for doing dental soldering...and now, PL259s.  This type of tool puts
the full power available into the stuff being soldered.   If it is enough to
quickly heat the object, then it works.

In its normal mode. a gun puts the power into the whole gun "wire" and this
must then transfer heat to the work through conduction - usually via a very
small contact point which is an inefficent thermal conveyor.  The remaining
gun "wire" is accepting the vase bulk of the power and, therefore it is
wasted (un-used to heat the work).

Soldering things like PL259 generally requires thermal capacity, not just
temperature.  "Guns" are not well suited for this work.  This is
accomplished with a LARGE tip.  You need to get in, heat quickly and get out
quickly.  The large tip allows you to heat, in a shirt time, the _work_,
which also has a large thermal mass, without cooling the tip appreciably.
To do a good job, you should be able to heat the shell in less than
something like 2 seconds, apply solder, let it flow and get out in a total
of something line 5-6 seconds.

I think the gun tip-wires turn red-hot, back from the tip, because you are
using the PL259 to keep the real "tip" cool and continuing to run the high
current through the tip WAY too long.  The power needed to maintain the
tip's temperature is not enough alone.  It is not really the wattage of the
heater, but the thermal capacity of the large tip that gives the amount of
and rate of heat transfer needed.

73, Steve, K.9,D;C'I


A trick demonstrated to me by a friend in New Mexico. (I use "N"'s and it
doesn't bother me, but he was putting a 259 on a piece of coax and managed
to amaze me.) You use a soldering gun, but with NO tip at all! He pushed the
gun sans tip into the ring where the holes for the solder to the braid are,
and pulled the trigger. In very little time, the I*I*R losses had the 259
hot enough to melt solder and he flowed it into the braid. Gets the heat
into the right place, Give it a try.

W4ZCB


<hhc314@yahoo.com> wrote in message
news:1130431775.836010.79240@g43g2000cwa.googlegroups.com...
> Guys, electronics technology and densities have changed quite a bit
> over the past 40 or so years.
>
> My first two soldering tools back in the 1950s were a 100-Watt American
> Beauty soldering iron, and a Weller Soldering Gun. By around 1965, both
> were too large and bulky to do precision work on the by then modern
> electronic, so I purchased a 37-Watt pencil iron (an Ungar Woodburner
> we called it at that time) which served my needs up to roughly 1989,
> when I added a miniature, variable temperature soldering iron to my
> collection which remains in use today.
>
> That original Weller Soldering Gun fell into disuse at least 25 years
> ago, except for emergency use in panic situation to light cigarettes,
> although I do take note of the fact that it was very useful for making
> quick-fix field repairs on the older, low-density, vacuum tube
> electronics, tinning the ends of power cords, etc.
>
> I continue to use the 100-Watt American Beauty through this day, but
> only for relatively heavy job like soldering the braid on RG-8U cables
> to the connectors.  Works fine on that application, particularly since
> its temperature tends to remain rather constant so it doesn't either
> oxidize most solders or destroy the item that the cable is being
> attached to.
>
> Arguably, most of the soldering I do today is performed by my
> temperature controlled iron, generally at temperature settings of 625
> or 720 degrees depending on the particular solder that I am using. Once
> or twice a year do I resort resort to the American Beauty. (It was a
> gift from my dad back in 1955 and remains in occasional use through
> this day.)
>
> Even years back, I simply can't remember any soldering iron tip that
> was pure copper (except for some of those antique iron that you heated
> on your gas stove). Soldering iron tips are usually plated with an iron
> coating, and for very good reason. The iron coating slow the pitting
> and eventual disolution of the tip in molten solder, which in turn
> extends the life of the tip.
>
> Kindest regards,  Harry C.
>
> p.s., I now recall that the earliest Weller Soldering Gun tips were
> bare copper, which required you to replace them at the rate of about 1
> tip per week in regular daily use. Those sold today are iron coated.
> Still, today I know of no one using Weller Soldering Guns for
> electronics, however, for the arts and crafts they can be very useful.
>




Article: 94737 of rec.radio.amateur.homebrew
From: "Steve Nosko" <suteuve.nosukowicuz@moutouroula.com>
Subject: Re: Wideband RF blocking
Date: Thu, 27 Oct 2005 13:33:48 -0500
Message-ID: <djr6ic$jaf$1@engnntp2.cig.mot.com>
References: <11lol6n6q2qsjc0@corp.supernews.com>

A resistor alone has also been used.  I have used a combination of L & R and
L with ferrite beads as well.
While the 500 ohm (10:1) guideline is a good one, teh impedance can drop
well below that before causing trouble.

ALso, the suggestion of the resistor to "dampen" a resonance is valid.  You
can take the choke above self resonance this way (self resonant freq can be
in the upper part of your freq range).  In the past, chokes were specially
wound to raise the self resonant freq, but for this range, I suspect there
isn't much help there.
73, Steve, K,9.D;C'I

P.S.
Paralleling caps and series'ing inductors is generally frowned upon.  If
needed, parallel caps are usually separated by a bead or resistor.  I've not
seen series chokes used.


"Joel Kolstad" <JKolstad71HatesSpam@yahoo.com> wrote in message
news:11lol6n6q2qsjc0@corp.supernews.com...
> In a receiver, for wideband (10-150MHz) biasing of a MMIC amplifier using
> inductors between the RF trace and the power rails, I'm finding that  a
single
> inductor tends not to work so well due to (1) wanting a largish inductor
(say,
> one with 500 ohms of reactance at 10MHz in a 50 ohm system --> 8uH) but
(2)
> not going beyond the self-resonant frequency of the inductor, which of
course
> is smaller the larger the inductance (that 8uH inductor might typically
have
> an SRF of 50MHz, noticeably below the 150MHz I'm trying to achieve RF
blocking
> to!).
>
> Is there a better means of providing wideband DC biasing/RF blocking than
just
> placing a large and small inductor in series?  I've run SPICE simulations
of
> this, and -- just as when you stack multiple capacitors in parallel for
wider
> RF coupling -- there are significant anti-resonances that drop the overall
> reactance of the pair of inductors to much less than 500 ohm (even less
than
> 50 ohms!) unless you're very careful in the choice of individual inductor
> SRFs, inductances, etc.
>
> Thanks,
> ---Joel Kolstad
>
>




Article: 94738 of rec.radio.amateur.homebrew
From: "Steve Nosko" <suteuve.nosukowicuz@moutouroula.com>
Subject: Re: Choice of iron powder toriod?
Date: Thu, 27 Oct 2005 13:35:44 -0500
Message-ID: <djr6m0$jcb$1@engnntp2.cig.mot.com>
References: <drW2f.17270$iM2.1412876@news.xtra.co.nz> <ve73f.431088$_o.170171@attbi_s71> <vXW3f.1513$D13.478@newssvr11.news.prodigy.com> <3B74f.437160$x96.227112@attbi_s72> <MUY4f.1931$dO2.1625@newssvr29.news.prodigy.net> <MY25f.493976$xm3.194708@attbi_s21> <4354FDA4.196B67C2@earthlink.net> <jX75f.442295$x96.129381@attbi_s72> <3F95f.2019$dO2.694@newssvr29.news.prodigy.net>


"Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
news:3F95f.2019$dO2.694@newssvr29.news.prodigy.net...
> Hello Bill,
>
> >    ...
>
> Then again a SW engineer once told me that nothing is truly analog.
> There is always that smallest digital step, the quantum.
> Regards, Joerg


    Poor fella's got it bass ackward.

73, Steve, K,9;D.C'I




Article: 94739 of rec.radio.amateur.homebrew
From: "Harold E. Johnson" <w4zcb@mchsi.com>
References: <gQ88f.5702$0V6.3968@trndny06>
Subject: Re: VNA and tank circuits?
Message-ID: <UP98f.480874$_o.130534@attbi_s71>
Date: Thu, 27 Oct 2005 19:24:36 GMT


"James Skalski" <jskalski@yahoo.com> wrote in message 
news:gQ88f.5702$0V6.3968@trndny06...
> Has anyone used a VNA to set up taps on an amplifier tank circuit or used 
> one to set up taps on a coil in a transmatch? Maybe a small capacitor on 
> the anode lead instead of the finals to match capacitance and then measure 
> from the output of the amplifier with antenna relays in "on" position. (no 
> other power to the amp :)

You bet Jim, ONLY way to do it! Put the tube in the socket, place a 1/4 watt 
resistor plate to ground of the value of your plate load, stick the VNA on 
the output port (Refl mode) and tune for maximum return loss. You should 
readily get 40 dB to 50 dB, log the settings and you're all tuned up. (Don't 
forget to pull the resistor before you apply power, although if you do, it 
will remove itself in short order.)

You can measure the caps and place tap on the inductors where you get return 
loss or measure the inductor and tune the caps for RL. Use the data in the 
handbook for expected values for the plate load resistance transformation 
and whether it's a Pi or Pi-L network.

Regards
W4ZCB 




Article: 94740 of rec.radio.amateur.homebrew
From: "Steve Nosko" <suteuve.nosukowicuz@moutouroula.com>
Subject: Re: Choice of iron powder toriod?
Date: Thu, 27 Oct 2005 13:38:29 -0500
Message-ID: <djr6r5$jj9$1@engnntp2.cig.mot.com>
References: <drW2f.17270$iM2.1412876@news.xtra.co.nz> <ve73f.431088$_o.170171@attbi_s71> <vXW3f.1513$D13.478@newssvr11.news.prodigy.com> <3B74f.437160$x96.227112@attbi_s72> <MUY4f.1931$dO2.1625@newssvr29.news.prodigy.net> <MY25f.493976$xm3.194708@attbi_s21> <4354FDA4.196B67C2@earthlink.net> <jX75f.442295$x96.129381@attbi_s72> <3F95f.2019$dO2.694@newssvr29.news.prodigy.net> <Eti5f.8621$lN2.115@fe04.lga> <MPG.1dc0285a10282227989c49@news.individual.net>


"Keith Williams" <krw@att.bizzzz> wrote in message
news:MPG.1dc0285a10282227989c49@news.individual.net...
> In article <Eti5f.8621$lN2.115@fe04.lga>, tmoranwms@charter.net
> says...
> > "Joerg" <notthisjoergsch@removethispacbell.net> wrote in message
> > news:3F95f.2019$dO2.694@newssvr29.news.prodigy.net...
> > > Then again a SW engineer once told me that nothing is truly analog.
> > > There is always that smallest digital step, the quantum.
> >
> > So, digital is base two, and analog is base 1.6 x 10^19? ;-)
>
> Not really.  Analog's bits are just smaller. ;-)
> -- Keith

That's what he said... 10^18 smaller
73, Steve, K,9.D;C'I




Article: 94741 of rec.radio.amateur.homebrew
From: "Steve Nosko" <suteuve.nosukowicuz@moutouroula.com>
Subject: Re: Choice of iron powder toriod?
Date: Thu, 27 Oct 2005 13:39:28 -0500
Message-ID: <djr6t1$jk8$1@engnntp2.cig.mot.com>
References: <drW2f.17270$iM2.1412876@news.xtra.co.nz> <ve73f.431088$_o.170171@attbi_s71> <vXW3f.1513$D13.478@newssvr11.news.prodigy.com> <3B74f.437160$x96.227112@attbi_s72> <MUY4f.1931$dO2.1625@newssvr29.news.prodigy.net> <MY25f.493976$xm3.194708@attbi_s21> <4354FDA4.196B67C2@earthlink.net> <jX75f.442295$x96.129381@attbi_s72> <3F95f.2019$dO2.694@newssvr29.news.prodigy.net> <Eti5f.8621$lN2.115@fe04.lga> <D6v5f.3535$tV6.3277@newssvr27.news.prodigy.net> <43568483.CCBB8C37@hotmail.com> <MPG.1dc0529ba3517d20989c55@news.individual.net>


"Keith Williams" <krw@att.bizzzz> wrote in message
news:MPG.1dc0529ba3517d20989c55@news.individual.net...
> In article <43568483.CCBB8C37@hotmail.com>,
> rabbitsfriendsandrelations@hotmail.com says...
> >
> >
> > Joerg wrote:
> >
> > > Still, the digital guys kept telling us "Some day we'll get there
> > > ........
> >
> > How long have they been saying that ????        ;-)
>
> We've been getting half the way there every two years or so. ;-)
>
> -- 
>   Keith



Don-chya love it ? !

73, Steve, K9DCI




Article: 94742 of rec.radio.amateur.homebrew
From: Skipp does mostly decafe now <skippdecafeguy@yahoo.com>
Subject: Re: HF Power Amplifier
Date: Thu, 27 Oct 2005 21:26:12 +0000 (UTC)
Message-ID: <djrglk$il8$2@skeeter.ucdavis.edu>
References: <cd2dnYCct7_j6MPenZ2dnUVZ_s6dnZ2d@comcast.com>

Hi Dennis, 

You're always welcome over on the Yahoo RFAmplifiers Group: 

http://groups.yahoo.com/group/rfamplifiers 

So is everyone else... 

cheers,
skipp 
www.radiowrench.com/sonic 

: Dennis, KA6GDT <wdwyman@comcast.net> wrote:
: Can anyone direct me to an area where I could find plans and/or directions 
: to construct a HF power amplifier? 




Article: 94743 of rec.radio.amateur.homebrew
Subject: Re: FAQ
From: Steveo <moparholic@hotmail.com>
Date: 27 Oct 2005 21:31:33 GMT
Message-ID: <20051027173133.767$xa@newsreader.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com>

"DrDeath" <drdeath555usb@yahoo.com> wrote:
> "Cmdr Buzz Corey" <me@that.ten> wrote in message
> news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
> > DrDeath wrote:
> >>
> >> I doubt he knows as much about radio than I do. And from what I have
> >> read of his posts, his IQ is certainly lower than my 147
> > 147? Yeah right.
>
> I realize that it is hard for you to comprehend that, with me being a
> CBer. Challenging a belief system can be tough. Like your belief that all
> CBers are to stupid to pass the ham test, that we sit around all day
> swilling beer and saying "ten-fer good buddy". Or my favorite belief you
> hold, "I have a ham ticket, that makes me special."
>
Ask him his call.


Article: 94744 of rec.radio.amateur.homebrew
Subject: Post of the week to rrcb
From: Steveo <moparholic@hotmail.com>
Date: 27 Oct 2005 21:33:16 GMT
Message-ID: <20051027173316.222$0w_-_@newsreader.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <djqv7i$lh6$1@newsg1.svr.pol.co.uk>

"The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk> wrote:
>> Why on earth would anyone want to pass an Amateur test to talk to guys
> like this is beyond me. At least with CB you can have a laugh and also
> use it sensibly without having to dedicate your whole life to the bloody
> thing.... Those people who look down on CB because they are amateurs
> really...really need to get out and experience some life..... and i dont
> mean down to the ham rallys to buy some more of someones junk to fill
> their houses with. Not all Amateurs are like this but theres a lot that
> are, and a lot of them sit in these newsgroups trying to prove something.
> Sad old farts....
>
IAWTP.


Article: 94745 of rec.radio.amateur.homebrew
Subject: Re: FAQ
From: Steveo <moparholic@hotmail.com>
Date: 27 Oct 2005 21:35:32 GMT
Message-ID: <20051027173532.064$f2@newsreader.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <uu02m1pacuecg6k3fphacaqvo5fna8lh63@4ax.com>

Jock. <real_classs_a@yahoo.co.uk> wrote:
> Any moron can pick up a microphone.
>
As proved my so many. License doesn't mean squat to me or K1man. <g>


Article: 94746 of rec.radio.amateur.homebrew
Subject: Re: FAQ
From: Steveo <moparholic@hotmail.com>
Date: 27 Oct 2005 21:37:43 GMT
Message-ID: <20051027173743.813$t5@newsreader.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com>

Cmdr Buzz Corey <me@that.ten> wrote:
> I find that those who brag about their IQs is about all they have to
> brag about.
>
Do you ever take a time-out from your CB posts to really ponder it, JJ?


Article: 94747 of rec.radio.amateur.homebrew
From: kb9rqz@amsat.org
Subject: looking for toughts on protable SSTV units
Date: Thu, 27 Oct 2005 18:31:13 -0400
Message-ID: <37l2m1h5raugrv01fhb77aadm5g1lagb04@4ax.com>

as the ownwer and using of one the Kenwoods VC-H1 a handheld all in
one unit for SSTV I was wondering whta folks wants simlarly portable
stuff are doing
_________________________________________
Usenet Zone Free Binaries Usenet Server
More than 140,000 groups
Unlimited download
http://www.usenetzone.com to open account


Article: 94748 of rec.radio.amateur.homebrew
Subject: BFO, CW, sideband question
From: Jaggy Taggy <outhouse@midcoast.com>
Message-ID: <BF86E6F4.B8E9%outhouse@midcoast.com>
Date: Fri, 28 Oct 2005 00:19:58 GMT

Who decides to which side of the carrier the BFO will heterodyne a CW
signal.
I mean there must be convention, otherwise we would have to find out on an
individual basis, but what is this convention???

Uwe



Article: 94749 of rec.radio.amateur.homebrew
Message-ID: <4361A237.72611D5F@earthlink.net>
From: "Michael A. Terrell" <mike.terrell@earthlink.net>
Subject: Re: 20meter propagation question...
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <435DAFD5.8AA536F2@spamfree.com> <iPV7f.1665$AS6.301@newsread3.news.atl.earthlink.net>
Date: Fri, 28 Oct 2005 03:58:36 GMT

Dan/W4NTI wrote:
> 
> Sorry Wendy... must of been a typo, right?   WWV is on 15 Mhz.


   Unless the receiver is really out of alignment! ;-)

-- 
?

Michael A. Terrell
Central Florida


Article: 94750 of rec.radio.amateur.homebrew
Date: Fri, 28 Oct 2005 00:21:17 -0400
From: Bill <exray@coqui.net>
Subject: Re: 20meter propagation question...
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <435DAFD5.8AA536F2@spamfree.com> <iPV7f.1665$AS6.301@newsread3.news.atl.earthlink.net> <4361A237.72611D5F@earthlink.net>
Message-ID: <e8cad$4361a73e$4232bd3f$26358@COQUI.NET>

Michael A. Terrell wrote:

> Dan/W4NTI wrote:
> 
>>Sorry Wendy... must of been a typo, right?   WWV is on 15 Mhz.
> 
> 
> 
>    Unless the receiver is really out of alignment! ;-)
> 

well, the IF image on many 'lesser' general coverage rigs with 455 kc IF 
would fall within a pointer width of 14000 so the OP may have been 
correct with his statement.

:)

-Bill


Article: 94751 of rec.radio.amateur.homebrew
From: "DrDeath" <drdeath555usb@yahoo.com>
Subject: Re: FAQ
Date: Fri, 28 Oct 2005 01:03:08 -0500
Message-ID: <11m3fou1v521m84@corp.supernews.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <uu02m1pacuecg6k3fphacaqvo5fna8lh63@4ax.com>

"Jock." <real_classs_a@yahoo.co.uk> wrote in message 
news:uu02m1pacuecg6k3fphacaqvo5fna8lh63@4ax.com...
> On Thu, 27 Oct 2005 11:03:45 -0500, "DrDeath" <drdeath555usb@yahoo.com> 
> wrote:
>
>>"Cmdr Buzz Corey" <me@that.ten> wrote in message
>>news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
>>> DrDeath wrote:
>>>>
>>>> I doubt he knows as much about radio than I do. And from what I have 
>>>> read
>>>> of his posts, his IQ is certainly lower than my 147
>>> 147? Yeah right.
>>
>>I realize that it is hard for you to comprehend that, with me being a 
>>CBer.
>>Challenging a belief system can be tough. Like your belief that all CBers
>>are to stupid to pass the ham test, that we sit around all day swilling 
>>beer
>>and saying "ten-fer good buddy". Or my favorite belief you hold, "I have a
>>ham ticket, that makes me special."
>
> Any moron can pick up a microphone.

Same with a keyboard. 




Article: 94752 of rec.radio.amateur.homebrew
From: "DrDeath" <drdeath555usb@yahoo.com>
Subject: Re: FAQ
Date: Fri, 28 Oct 2005 01:18:07 -0500
Message-ID: <11m3gl19ubk2259@corp.supernews.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com>

"Cmdr Buzz Corey" <me@that.ten> wrote in message 
news:NaCdnWeH65OynvzeRVn-gA@gbronline.com...
> DrDeath wrote:
>> "Cmdr Buzz Corey" <me@that.ten> wrote in message 
>> news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
>>
>>>DrDeath wrote:
>>>
>>>>I doubt he knows as much about radio than I do. And from what I have 
>>>>read of his posts, his IQ is certainly lower than my 147
>>>
>>>147? Yeah right.
>>
>>
>> I realize that it is hard for you to comprehend that, with me being a 
>> CBer. Challenging a belief system can be tough. Like your belief that all 
>> CBers are to stupid to pass the ham test, that we sit around all day 
>> swilling beer and saying "ten-fer good buddy". Or my favorite belief you 
>> hold, "I have a ham ticket, that makes me special."
>
> I find that those who brag about their IQs is about all they have to brag 
> about. I know people with IQs higher then yours who couldn't find their 
> way to the bathroom and back without help, so what does you IQ prove? 
> Nothing.

I only pointed it out to show that you believe those that use cb radio and 
those with no ham ticket are intellectually inferior. So yes, I proved that 
quite clearly.

>
> As far as knowing more about radio, I converted my first transmitter, a 
> Heath DX-60 from controlled carrier AM (you even know what controlled 
> carrier AM is without looking it up?) to high level plate modulation (you 
> even know what high level plate modulation is without looking it up?). I 
> once designed and built my own SSB 80-10 meter transmitter plus many other 
> pieces of ham equipment. Also constructed a 15 meter three element beam 
> using gamma matching (you even know what gamma matching is without looking 
> it up?). What have you designed and built for your 'good buddy ten-fer 
> ther' cb hobby, mister IQ?

I don't need to look up any of those items.
I am in the process of building a ssb radio to match the linear I built last 
year. Though I am certain I spend a great deal less time working on those 
types of projects as I have other interests in my life. 




Article: 94753 of rec.radio.amateur.homebrew
From: "DrDeath" <drdeath555usb@yahoo.com>
Subject: Re: FAQ
Date: Fri, 28 Oct 2005 01:22:43 -0500
Message-ID: <11m3gtmnn90m2f4@corp.supernews.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <20051027173133.767$xa@newsreader.com>

"Steveo" <moparholic@hotmail.com> wrote in message 
news:20051027173133.767$xa@newsreader.com...
> "DrDeath" <drdeath555usb@yahoo.com> wrote:
>> "Cmdr Buzz Corey" <me@that.ten> wrote in message
>> news:WJCdnaayK53mTcLeRVn-iA@gbronline.com...
>> > DrDeath wrote:
>> >>
>> >> I doubt he knows as much about radio than I do. And from what I have
>> >> read of his posts, his IQ is certainly lower than my 147
>> > 147? Yeah right.
>>
>> I realize that it is hard for you to comprehend that, with me being a
>> CBer. Challenging a belief system can be tough. Like your belief that all
>> CBers are to stupid to pass the ham test, that we sit around all day
>> swilling beer and saying "ten-fer good buddy". Or my favorite belief you
>> hold, "I have a ham ticket, that makes me special."
>>
> Ask him his call.

OK Hey Cmdr Buzz Corey, whats your call? 




Article: 94755 of rec.radio.amateur.homebrew
From: "William E. Sabin" <w.sabin@mchsi.com>
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <4361B359.6040805@invalid.invalid>
Subject: Re: BFO, CW, sideband question
Message-ID: <Gzo8f.281640$084.253205@attbi_s22>
Date: Fri, 28 Oct 2005 12:11:18 GMT

My FT1000MP mark V allows either USB or LSB CW reception, according to front 
panel  push buttons.

Bill W0IYH

"Doug Smith W9WI" <w9wi@invalid.invalid> wrote in message 
news:4361B359.6040805@invalid.invalid...
> Jaggy Taggy wrote:
>> Who decides to which side of the carrier the BFO will heterodyne a CW
>> signal.
>> I mean there must be convention, otherwise we would have to find out on 
>> an
>> individual basis, but what is this convention???
>
> A BFO will heterodyne a signal on *both* sides of the carrier.  Most 
> modern receivers are designed to filter out the heterodyne on one side. 
> For CW signals, which side depends on the manufacturer.  (i.e. there is no 
> convention!)
> -- 
> Doug Smith W9WI
> Pleasant View (Nashville), TN  EM66
> http://www.w9wi.com
> 




Article: 94756 of rec.radio.amateur.homebrew
From: "Caveat Lector" <UALLBeware@9984reader.com>
References: <BF86E6F4.B8E9%outhouse@midcoast.com>
Subject: Re: BFO, CW, sideband question
Message-ID: <GNp8f.14121$i%.722@fed1read07>
Date: Fri, 28 Oct 2005 06:34:49 -0700

When in the CW mode, My Kenwood TS-870 defaults to the USB, by pushing CW 
REV, it goes to LSB
Handy when in a DX pileup, the split is a few KHz up and the big guns are 
obliterating the weak DX station

-- 
CL -- I doubt, therefore I might be !






"Jaggy Taggy" <outhouse@midcoast.com> wrote in message 
news:BF86E6F4.B8E9%outhouse@midcoast.com...
> Who decides to which side of the carrier the BFO will heterodyne a CW
> signal.
> I mean there must be convention, otherwise we would have to find out on an
> individual basis, but what is this convention???
>
> Uwe
> 




Article: 94757 of rec.radio.amateur.homebrew
From: et472@FreeNet.Carleton.CA (Michael Black)
Subject: Re: 20meter propagation question...
Date: 28 Oct 2005 14:48:04 GMT
Message-ID: <djtdn4$ic$1@theodyn.ncf.ca>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <435DAFD5.8AA536F2@spamfree.com> <iPV7f.1665$AS6.301@newsread3.news.atl.earthlink.net> <4361A237.72611D5F@earthlink.net> <e8cad$4361a73e$4232bd3f$26358@COQUI.NET>


Bill (exray@coqui.net) writes:
> Michael A. Terrell wrote:
> 
>> Dan/W4NTI wrote:
>> 
>>>Sorry Wendy... must of been a typo, right?   WWV is on 15 Mhz.
>> 
>> 
>> 
>>    Unless the receiver is really out of alignment! ;-)
>> 
> 
> well, the IF image on many 'lesser' general coverage rigs with 455 kc IF 
> would fall within a pointer width of 14000 so the OP may have been 
> correct with his statement.
> 
> :)
> 
> -Bill

And of course, the receivers that had such bad image rejection tended to
have lousy dial calibration too.

    Michael  VE2BVW



Article: 94758 of rec.radio.amateur.homebrew
From: "Mike Andrews" <mikea@mikea.ath.cx>
Subject: Re: 20meter propagation question...
Date: Fri, 28 Oct 2005 15:02:30 +0000 (UTC)
Message-ID: <djtei6$3gq$4@puck.litech.org>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com> <435DAFD5.8AA536F2@spamfree.com> <iPV7f.1665$AS6.301@newsread3.news.atl.earthlink.net> <4361A237.72611D5F@earthlink.net> <e8cad$4361a73e$4232bd3f$26358@COQUI.NET> <djtdn4$ic$1@theodyn.ncf.ca>

Michael Black <et472@freenet.carleton.ca> wrote:

> Bill (exray@coqui.net) writes:
>> Michael A. Terrell wrote:
>> 
>>> Dan/W4NTI wrote:
>>> 
>>>>Sorry Wendy... must of been a typo, right?   WWV is on 15 Mhz.
>>> 
>>> 
>>> 
>>>    Unless the receiver is really out of alignment! ;-)
>>> 
>> 
>> well, the IF image on many 'lesser' general coverage rigs with 455 kc IF 
>> would fall within a pointer width of 14000 so the OP may have been 
>> correct with his statement.
>> 
>> :)
>> 
>> -Bill

> And of course, the receivers that had such bad image rejection tended to
> have lousy dial calibration too.

As in "WWV comes in from 14.35 to 15.60, roughly." 

I had one of those. 

-- 
(About Cobalt): They're not servers. They're Fisher-Price toys with
delusions of grandeur. One of these days, I'm expecting someone to enter
my office with a pull-along version of the Qube. playing a silly little
tune as it rolls through the door... -- Chris King, in the Monastery


Article: 94759 of rec.radio.amateur.homebrew
From: novatech@eskimo.com (Steven Swift)
Subject: Re: best material for turning a closet into a Faraday cage
Date: 28 Oct 2005 15:10:50 GMT
Message-ID: <djtf1q$cb9$1@eskinews.eskimo.com>
References: <1129698816.759523.298440@g43g2000cwa.googlegroups.com> <uiE5f.7728$nk2.5933@trnddc07>

"SignalFerret" <signalferret@verizon.net> writes:

>Check this article out.

>www.qsl.net/n9zia/wireless/pdf/julaug1998-p64.pdf

[...]

>Come to think of it, of all the screen rooms, and sheet metal shielded rooms 
>I've ever been in the biggest problem was ventilation.

>Robert N3LGC 

You can get aluminum or copper window screen material and they work really
well without affecting ventilation much.

-- 
Steven D. Swift, novatech@eskimo.com, http://www.novatech-instr.com
NOVATECH INSTRUMENTS, INC.      P.O. Box 55997
206.301.8986, fax 206.363.4367  Seattle, Washington 98155 USA 


Article: 94760 of rec.radio.amateur.homebrew
From: hexter@blazenet.net (Gudmundur)
Subject: Re: A, An, or The FAQ
Date: Fri, 28 Oct 2005 22:50:59 -0000
Message-ID: <11m5aqjf77uufed@corp.supernews.com>
References: <1130522688.763854.113650@g44g2000cwa.googlegroups.com>

In article <1130522688.763854.113650@g44g2000cwa.googlegroups.com>, 
aiyr.r.bean@lycos.co.uk says...
>
>What is Ham Radio?


 Do you have some point to prove here you ignorant bandwidth waster?
What kind of asswipe constantly posts the same dribble when in fact
newsgroup articles are archived?

 What is Polymath?

 He is a self important asshole who's self assumed duty is to educate
folks about that which he knows nothing but only quotes things he has
heard or read. No actual brain activity belongs to PolyDouche.

 Why do you constantly keep this up?? You prove you are to newsgroups
the very thing you hate most about others.

 Why waste the space on this newsgroup, and why waste the bandwidth???
If you want something to play with stick your hands in your pocket and
play. You are the lowest form of life that exists.

 You Polymath are truely worthless, no one here learns from your constant
post of the same dribble and in fact no self respectable ham would act
in the way you do, proving you are among the most childish of the very
CB'ers you seem to hate.

 Suck me, blow us, or just blow away!!  Fuck your useless posts!!!
Go talk politics with the WalMartians at your local WalMart.

 Do you have nothing better to do than post the same worthless note?
Are you that lonely and disfunctional? You don't even rate as high
on the evolutionary scale as the idiots of 3898khz.

 You have made a name for yourself indeed  Polymath the biggest asshole
known to any newsgroup.

 Tell us of anything electronic or ham related that you ever built. Give
us something of value. You can't and you know it and it pisses you off
to look at such a worthless asshole in the mirror each and every morning
and the worst part is tomorrow isn't looking any better.

 Take your worthless post, print ten thousand copies and shove one up
your ass each morning while you contemplate your own suicide. If you
lack the methods and means to such an end I'll be the first in line to
by you a complete suicide do-it-yourself kit.

 Opinions expressed here are my own but reflected by the entire newgroup
and anyone else with 2 or more functioning brain cells.

 Piss off pal and take your idiotic plagerised post with you.
 



Article: 94761 of rec.radio.amateur.homebrew
From: "From the shack of G1LVN" <gareth.paley@gmail.invalid.com>
Subject: Re: A, An, or The FAQ
Date: Fri, 28 Oct 2005 23:25:06 +0000 (UTC)
Message-ID: <djuc0i$k4r$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com>
References: <1130522688.763854.113650@g44g2000cwa.googlegroups.com> <11m5aqjf77uufed@corp.supernews.com>

"Gudmundur" <hexter@blazenet.net> wrote in message
news:11m5aqjf77uufed@corp.supernews.com...

please don't cross post this is what happened our regular cross poster on
uk.radio.amateur

http://tinyurl.com/5mcwk

It gets worse:

http://tinyurl.com/cdudd


-- 
drei unt siebzig  deG1LVN
http://www.outpimp.com/?x=481566961
--------------------------------------
read rfc1855.txt first and
remove .invalid to reply




Article: 94762 of rec.radio.amateur.homebrew
From: nothermark <trash@gnomex.cotse.net>
Subject: Re: Pulsing LEDs for higher efficiency
Message-ID: <obn5m1l5jf3dh5gkri8gkggojeeaoss4lm@4ax.com>
References: <2-idnQXJaNeGAdDeRVn-rg@comcast.com>
Date: Sat, 29 Oct 2005 02:30:36 GMT

On Wed, 12 Oct 2005 19:28:03 -0400, "Tom Coates"
<tecoatesHatesSpam@comcast.net> wrote:

>I want to build some emergency lighting equipment using LEDs and 12V. A
>friend told me that it is possible to get more light per Watt by pulsing the
>LED to instantaneous levels well above its average ratings.
>
>Is this true, if you include power consumed in the pulsing circuit?
>
>If it is, can anyone suggest a simple and cheap circuit and the appropriate
>operating values?
>
>The reason for the 12V requirement is that I'm also working on a solar
>charger for my transceiver batteries and want to use the same charger for
>the lighting batteries.
>
>Suggestions would be appreciated.
>
>Tom, N3IJ
>

take a look at the new crop of 1W LED flashlights that are on the
market.  A lot of very white light from these modules.  No need to
bother with trying t get intensity, something like 8 hours off 3 AAA
batteries. 


Article: 94763 of rec.radio.amateur.homebrew
Subject: Re: BFO, CW, sideband question
From: Jaggy Taggy <outhouse@midcoast.com>
Message-ID: <BF88698C.BDE6%outhouse@midcoast.com>
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com>
Date: Sat, 29 Oct 2005 03:49:25 GMT

I started this thread because there is a bit of confusion in my head
regarding where the signal is, where the carrier is and what is indicated on
my radio dial.

And by the way, I do have an older radio, a Kenwood TS 830, not a modern
radio. My radio-display shifts on transmit to a frequency 800 Hz higher than
what was displayed on receive.

So I assume it displays the carrier frequency on transmit, while on receive
it displays the heterodyned frequency, which on my radio happens to be
lower, but as some indicated in this group, this is an arbitrary choice made
by the people at Kenwood.


The ARRL CW transmissions frequencies, for example, seem to be given for the
carrier which is not what my radio displays (my radio displays 800HZ lower
on receive) and therefore I need to adjust my radio to a different frequency
than what is advertised.

This is confusing to me.


It is also confusing me that I can't receive SSB on the lower bands using
USB (and a slight retune), I need to use LSB.
I don't know why since I learned that the two sidebands contain the same
info. 


And the more I think about it the more I realize that I don't really
understand this whole topic very well...

Uwe





On 10/28/05 9:45 AM, in article
1130507121.872430.44070@z14g2000cwz.googlegroups.com, "Tim Shoppa"
<shoppa@trailing-edge.com> wrote:

>> Who decides to which side of the carrier the BFO will
>> heterodyne a CW signal.
> 
> For many SSB+CW transceivers, the maker of the transceiver decided on a
> default sideband at manufacture time.  Usually USB for rigs that are
> capable of both sidebands.
> 
> For the oldest SSB equipment you don't get a choice of sideband:
> 14MHz and above comes out on USB, 7MHz and below come out on LSB, due
> to the 9MHz IF + 5MHz VFO scheme.
> 
>> I mean there must be convention, otherwise
>> we would have to find out on an individual basis
> 
> It doesn't matter as long as you're consistent between your TX and RX,
> AND you make sure you're inside your band.
> 
> With most (all?) modern synthesized transceivers the frequency on the
> display is that of the CW transmission in CW mode, but on older SSB+CW
> rigs there was an offset (between a few hundred Hz and a few kHz)
> between the dial and the actual CW transmission frequency (which was in
> the sideband - the dial was calibrated to the suppressed carrier
> frequency in USB/LSB).  The offset was usually mentioned in the manual
> (or in fancier rigs with RIT/XIT could be dialed in).
> 
> Tim.
> 



Article: 94764 of rec.radio.amateur.homebrew
Date: Sat, 29 Oct 2005 00:05:17 -0400
From: Bill <exray@coqui.net>
Subject: Re: BFO, CW, sideband question
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com> <BF88698C.BDE6%outhouse@midcoast.com>
Message-ID: <69a7b$4362f4ff$4232bdbf$27241@COQUI.NET>

Jaggy Taggy wrote:

> 
> And by the way, I do have an older radio, a Kenwood TS 830, not a modern
> radio. My radio-display shifts on transmit to a frequency 800 Hz higher than
> what was displayed on receive.

The 'true' CW frequency would be that of zero-beat as opposed to where 
you 'hear' the signal.  The rig assumes that you are listening to a beat 
note offset by about 800 Hz and compensates accordingly on transmit.
> 
> So I assume it displays the carrier frequency on transmit, while on receive
> it displays the heterodyned frequency, which on my radio happens to be
> lower, but as some indicated in this group, this is an arbitrary choice made
> by the people at Kenwood.

I think we're saying the same thing.
> 
>> 
> It is also confusing me that I can't receive SSB on the lower bands using
> USB (and a slight retune), I need to use LSB.
> I don't know why since I learned that the two sidebands contain the same
> info. 

Alas, a SSB station is only transmitting one of the sidebands!  This by 
convention is LSB on 40 and below and USB on 20 or above.  If a station 
WERE to xmt USB on 75 meters, for instance, you would have to use the 
USB position and would not be able to detect it in LSB.

-Bill


Article: 94765 of rec.radio.amateur.homebrew
Subject: Re: BFO, CW, sideband question
From: Jaggy Taggy <outhouse@midcoast.com>
Message-ID: <BF8884F5.C396%outhouse@midcoast.com>
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com> <BF88698C.BDE6%outhouse@midcoast.com> <69a7b$4362f4ff$4232bdbf$27241@COQUI.NET>
Date: Sat, 29 Oct 2005 05:46:22 GMT

> Alas, a SSB station is only transmitting one of the sidebands!  This by
> convention is LSB on 40 and below and USB on 20 or above.  If a station
> WERE to xmt USB on 75 meters, for instance, you would have to use the
> USB position and would not be able to detect it in LSB.
> 
> -Bill


Right Bill, but why. Could I not retune my receiver so that I would catch
the transmitted sideband with my "LSB window"?

I guess from experience the answer is no, and that is also what you said,
but what is the reason??

Uwe



Article: 94766 of rec.radio.amateur.homebrew
From: "Peter" <bra�nbuster@lineone.net>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com>   <1129905039.542653.237720@f14g2000cwb.googlegroups.com>   <1129907164.767284.255910@g49g2000cwa.googlegroups.com> <1129920662.717947.78290@g44g2000cwa.googlegroups.com>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 06:25:32 +0100
Message-ID: <43630f8d.0@entanet>

"Polymath" <aiyr.r.bean@lycos.co.uk> wrote...
> Unbeknown to me, this thread had already been cross-posted to
> the CB groups, and I would have removed that cross-posting
> had I been aware of it.

Why, so that you can abuse people behind their back?  What would be the point
of replying to someone, but cutting out the group that the OP uses?

> In respect of that, I apologise if my remarks have caused
> any offence to the CB community.

I would bet that, if this was cross-posted to *real" tech groups, many qualified
engineers would also be offended by your suggestion that you are a "higher"
level of person.

> However, I do not withdraw my
> remarks - they are my opinion as to the relative
> standing of Radio Hams and of CB Radio
> enthusiasts where the playing-field is that of Radio
> Hams.

Playing field?  So this is nothing more than a game to you, see who can cause the
most offence.

Your problem is that you are blaming the wrong people.
Maybe this is all just an excuse, a cover for your hatred of CB, nothing to do with
Amateur rules.  Otherwise you would direct your comments and anger at those
making the changes.

> However, having said that, the material quoted below
> serves, I think, to illustrate quite well the
> intellectual standing of CB Radio enthusiasts
> upon which I have commented.....

You write a message which anyone of at least average intelligence will know will offend
certain groups of people, then pretend to be shocked when some respond angrily.  You
may be a Ham, but that doesn't mean you can act.

Before putting the angry response down to "CB mentality", take a look through the Google
archives at all the serious abuse sent to newsgroups by some licensed Amateurs.
Six of one, half a dozen of the other.


Regards,

Peter.




Article: 94767 of rec.radio.amateur.homebrew
From: "Peter" <bra�nbuster@lineone.net>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 06:25:34 +0100
Message-ID: <43630f8e.0@entanet>

"Polymath" <aiyr.r.bean@lycos.co.uk> wrote...
> Because although CBers are in a different intellectual
> class to Radio Hams, it is neither my wish to insult
> them nor to enter into a discourse with them.

NO...
It IS your intention to insult them, just behind their backs so you run less risk
of them replying.  Your post was not really intended as an "FAQ", it was purely
a relatively "safe" release for your personal anger.

Wuss.


> CBers have the right to besport their habits in the
> appropriate place as do all the lower classes, which
> in this context is rrcb (and urrcb).

If you must start seeing this as a class system, look up "Amateur" in a dictionary.
Please consider the meaning of the word before suggesting that an "Amateur" is
above the professionals who design and build equipment to the standards set by
Governments, standards far above that required by an *amateur* producing
equipment for his own personal use.


> > >A CB Radio hobbyist, on the other hand, sees no difference between
> > >a Ham Radio licence and a CB Radio licence. To him, they are
> > >sisters-under-the-skin. Wrongly, the CB Radio Hobbyist then
> > >tries to classify himself as the equal of the Radio
> > >Ham when, in fact, he is nothing of the kind. A sure sign of
> > >a CB Radio hobbyist is if he holds, or has ever held, a licence
> > >issued under the gangrenous degeneration that is the
> > >M3/CB Fools' Licence scheme.
> > >
> > >-----ooooo-----
> > >
> > >One group of people who claim to be of the standard of
> > >Radio Hams but who are in reality nothing more than an
> > >apology for the failure of a CBer are those class B
> > >licensees who falsely proclaimed that they were against
> > >the use of a Morse Test to control access to the HF
> > >bands, until, that is, a test was introduced at their
> > >intellectual level, the intellectual level of 6-year-olds.
> > >
> > >6 year-olds simply lack the mathematical tool kit to
> > >enable them to handle even the simplest algebraic manipulation
> > >for Ohm's Law and thus, the disgraceful Class Ber's in
> > >the aforementioned category are not Radio Hams by any stretch
> > >of the imagination!


Comparing, as you call them, "disgraceful Class Ber's" to 6 year old children is clearly
intended to insult people.

Please think before displaying such ignorance and stupidity by blaming CBers for the rules...
they have absolutely NO CONTROL over such matters.  CBers neither set the rules nor claim to
represent "members", that woukld be Ofcom and the RSGB.

CBers do NOT see Amateur and CB as "sisters", it is people like the RSGB, the RA and Ofcom and
a certain magazine publisher who see it that way and make decisions to mix, combine and change
rules and formats.
Any sensible CBer would prefer to keep Amateur and CB separate, as they are separate services
for totally different purposes.

If you must get so angry, do yourself a couple of favours...
  1. Blame and whine at the correct people, those able to make the changes.
  2. Watch your blood pressure, OM.


I agree with keeping the Amateur requirements higher.  I agree that it is now too
simple, and has been for some years.  I believe that Amateur radio should be for those
with a real interest in radio, and tests should be set to allow those people through - not
to get the licence figures up.
But it's pointless blaming people for taking what is on offer, sitting the test required to
get their licence.


Regards,

Peter.





Article: 94768 of rec.radio.amateur.homebrew
Date: Sat, 29 Oct 2005 02:29:39 -0400
From: Bill <exray@coqui.net>
Subject: Re: BFO, CW, sideband question
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com> <BF88698C.BDE6%outhouse@midcoast.com> <69a7b$4362f4ff$4232bdbf$27241@COQUI.NET> <BF8884F5.C396%outhouse@midcoast.com>
Message-ID: <1821e$436316d6$4232bdbf$6261@COQUI.NET>

Jaggy Taggy wrote:

>>Alas, a SSB station is only transmitting one of the sidebands!  This by
>>convention is LSB on 40 and below and USB on 20 or above.  If a station
>>WERE to xmt USB on 75 meters, for instance, you would have to use the
>>USB position and would not be able to detect it in LSB.
>>
>>-Bill
> 
> 
> 
> Right Bill, but why. Could I not retune my receiver so that I would catch
> the transmitted sideband with my "LSB window"?
> 
> I guess from experience the answer is no, and that is also what you said,
> but what is the reason??
> 
> Uwe
> 

Visualize a LSB signal as having the carrier frequency at 7000 kcs (or 
more precisely, phantom carrier).  The audio sidebands tune down to 
6997.  A USB signal on the same freq has the audio sidebands from 7000 
to 7003.

To tune to an SSB signal (and have it intelligible) you have to tune to 
the phantom carrier freq.  You can't fool the rcvr by going 3kc hi or 
low and switching sidebands.  Yes, the signal is there - to wit you can 
hear it - but you can't detect it.

Why?  Think about how BFO injection works.  Take a fixed freq BFO of 
7000 in this case for simplicity. 7000 beating against an USB audio 
sideband at 7001 gives you a bit of 1 kc audio information.  Repeat the 
same with an audio sideband at 7002...you get the 2kc audio information. 
  If you try to fool the radio by tuning to 7003 and selecting LSB, yes 
you have duplicated the bandpass from 7003-7000 but all that audio 
information is now inverted.

In most rigs nowadays there's a single filter of about 2-3kc width that 
is used for both sidebands.  When you select USB or LSB you're simply 
moving the bfo freq from one edge to the other.

Thats all an oversimplification but does it make sense?

-Bill


Article: 94769 of rec.radio.amateur.homebrew
From: "Wor" <damir.brcko@zg.htnet.hr>
Subject: Re: BFO, CW, sideband question
Date: Sat, 29 Oct 2005 08:53:02 +0200
Message-ID: <djv68l$ou3$1@bagan.srce.hr>
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com> <BF88698C.BDE6%outhouse@midcoast.com> <43630C0E.1080204@invalid.invalid>

Hi!
Just to make things more complex (or simple). When you tune from LSB to USB
you also change the frequency of BFO, putting it on one side or another of
the IF filter. If you listen to LSB on USB position you can put the
simulated carrier frequency on the right place, but signal is out of IF
passband.
Sorry for my bad English. Hope you understand.
Damir 9A3IV




Article: 94770 of rec.radio.amateur.homebrew
From: "Bill" <bcrann1@hotmail.com>
Subject: Cheap Repeater Controller???
Message-ID: <IbF8f.8354$ki7.678793@news20.bellglobal.com>
Date: Sat, 29 Oct 2005 04:36:30 -0230

I am in the process of building a 2M repeater.  I have everything except for 
a controller.  I am looking for a cheap controller or a circuit to build my 
own.  I don't need anything fancy.  Also is there any PC Controller software 
besides EchoStation?

Bill 




Article: 94771 of rec.radio.amateur.homebrew
From: Spike <Aero.Spike@Technologies.invalid>
Subject: Re: A, An, or The FAQ
Date: Sat, 29 Oct 2005 09:26:06 +0100
Message-ID: <8cc6m11qjr1g479cn5lc7hj52hg1spnjl0@4ax.com>
References: <1130522688.763854.113650@g44g2000cwa.googlegroups.com> <11m5aqjf77uufed@corp.supernews.com> <1130560272.304565.325300@o13g2000cwo.googlegroups.com> <1130561627.408477.47620@z14g2000cwz.googlegroups.com> <djv2tv$2c2a$1@news.mattsnetwork.co.uk>


Polymouth wrote:

>> it is ALWAYS open for others to publish their own FAQs.

Well, here's a Frequently Posted Rubbish (FPR) to start things off:

Ham Radio (sic) is full of myths.

Do not be taken in by them, no matter how badly expressed.

The following is a collection of items that have been claimed as facts
by supporters of UK 'ham radio' (sic), that needed correcting in order
not to mislead the uncritical reader

Bookmark for future reference, as these items tend to recur.

New items added. This is Version V. It replaces all other Versions.

[ ] In the UK, no repeat no licence of any kind is necessary to
specify, design, construct, modify, repair, own, or (under some
circumstances) test an Amateur transmitter.

[ ] A pass in a current examination for a UK Amateur Licence qualifies
the successful candidate for the issue of a UK Licence. Holders of the
appropriate levels of licence are permitted to operate transmitting
equipment that is not subject to a formal approvals procedure, and to
carry out technical investigations. A qualification for a Licence, or
the Licence itself, is not, repeat not, a qualification to specify,
design, construct, modify, repair, or own transmitting equipment. 
See above.

 [ ] Before sunrise on Friday, September 1st, 1939, Germany attacked
Poland at 4:45am, when the Battleship "Schleswig-Holstein", on a
so-called goodwill visit, opened fire on the Polish naval depot and
garrison at Westeplatte. World War II had begun. An hour later, first
German units crossed the Polish border. Britain entered the war two
days later. She did not repeat not start WWII.

 [ ] Because the 'dimensions' of both sides of the Radar Range
Equation need a term having the units of square metres in order to
balance, references to ratios of these terms expressed in terms of
decibels does not repeat not imply that they are in themselves a ratio
of powers.

 [ ] FM can be demodulated by an AM receiver using the 'Slope
Detection' method. Placing an NBFM signal entirely within a channel in
a channelised AM receiver is not repeat not Slope Detection.

 [ ] A company's Returns Policy is not repeat not an admission that it
deliberately produces shoddy goods, no matter how well wrapped at the
time of purchase.

 [ ] An IP Address in the headers of one's posts is not repeat not
Secret Information.

 [ ] An exemplary driver is not repeat not one who makes an obscene
gesture to show that the other driver is an idiot.

 [ ] An exemplary driver is not repeat not one who repeats an obscene
gesture to confirm that the other driver is an idiot.

 [ ] XRC is not repeat not a suitable method of differentiating
between the 80 percent of metals that have FCC crystal structure.

 [ ] Millimetre-waves are not repeat not generated by 'nuclear
emissions'.

 [ ] The length of the day on this planet is not repeat not 23H20.

 [ ] A spring/damper model is not repeat not a mechanical analogue of
a capacitor/inductor.

 [ ] Dehumidifiers do not repeat not work by absorbing heat.

 [ ] Gas Company piping is not repeat not blue in colour.

 [ ] 1 deciBel is not repeat not equal to 10 Bels.

----------

from
Aero Spike


Article: 94772 of rec.radio.amateur.homebrew
Subject: Re: FAQ
From: Steveo <moparholic@hotmail.com>
Date: 29 Oct 2005 10:15:44 GMT
Message-ID: <20051029061544.320$Ru@newsreader.com>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com> <11m3gl19ubk2259@corp.supernews.com> <QtadncqrxfwMa__eRVn-2Q@gbronline.com>

Cmdr Buzz Corey <me@that.ten> wrote:
> DrDeath wrote:
>
> > I don't need to look up any of those items.
> > I am in the process of building a ssb radio to match the linear I built
> > last year. Though I am certain I spend a great deal less time working
> > on those types of projects as I have other interests in my life.
> >
> >
>
> Care to give some details like what method of SSB generation this here
> radio will use?
>
Care to tell us your call sign, buzzard?


Article: 94773 of rec.radio.amateur.homebrew
From: "realradioham" <realradioham@tiscali.co.uk>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com>
Subject: Re: A, An, or The FAQ
Date: Sat, 29 Oct 2005 11:52:38 +0100
Message-ID: <43635474$1_2@mk-nntp-2.news.uk.tiscali.com>


"Polymath" <mysteron@mailblocks.com> wrote in message 
news:1130581695.118149.40220@g47g2000cwa.googlegroups.com...
> Some interesting details about 'Polymouth'
>
> http://tinyurl.com/cdudd
>
> http://tinyurl.com/5mcwk
>
>
>
The above bad press has done nothing but harm to the public perception of 
ham radio.  Are you proud of your behaviour????

RRH 




Article: 94774 of rec.radio.amateur.homebrew
From: "William E. Sabin" <w.sabin@mchsi.com>
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com> <BF88698C.BDE6%outhouse@midcoast.com> <43630C0E.1080204@invalid.invalid> <djv68l$ou3$1@bagan.srce.hr>
Subject: Re: BFO, CW, sideband question
Message-ID: <x7K8f.283670$084.68522@attbi_s22>
Date: Sat, 29 Oct 2005 12:43:09 GMT

Modern radios such as the FT1000MP Mk V automatically change the internal 
local oscillator frequencies so that USB, LSB and CW appear on the same 
indicated signal frequency, which is what we want.  In CW we get a certain 
pitch frequency such as 500 Hz (not zero beat) at the signal frequency. The 
value of this pitch frequency can be changed from the front panel by the 
operator to suit his preference.

In my homebrew rcvr I use the CW USB setting only. As I tune up the band I 
hear the high pitch of a signal first and it then decreases pitch as I 
continue to tune up the band (my preference). I use a single xtal filter 
frequency for USB/LSB and a single xtal filter frequency for CW. The BFO 
xtal frequency and the VFO frequency counter digital readout (not the actual 
VFO frequency itself) are automatically changed to their correct values in 
LSB, CW or USB mode. In CW mode I then have a 500 Hz beat note, which is 
what I want, not zero beat, and the CW BFO xtal is then the correct value 
for CW USB.

For a brief description of my homebrew rcvr see QRZ.COM, W0IYH.

Bill W0IYH

"Wor" <damir.brcko@zg.htnet.hr> wrote in message 
news:djv68l$ou3$1@bagan.srce.hr...
> Hi!
> Just to make things more complex (or simple). When you tune from LSB to 
> USB
> you also change the frequency of BFO, putting it on one side or another of
> the IF filter. If you listen to LSB on USB position you can put the
> simulated carrier frequency on the right place, but signal is out of IF
> passband.
> Sorry for my bad English. Hope you understand.
> Damir 9A3IV
>
> 




Article: 94775 of rec.radio.amateur.homebrew
Message-ID: <43637AB4.30009@invalid.invalid>
From: Doug Smith W9WI <w9wi@invalid.invalid>
Subject: Re: BFO, CW, sideband question
References: <BF86E6F4.B8E9%outhouse@midcoast.com> <1130507121.872430.44070@z14g2000cwz.googlegroups.com> <BF88698C.BDE6%outhouse@midcoast.com> <43630C0E.1080204@invalid.invalid> <SN6dnfdoQoFOwv7eRVn-ug@bright.net>
Date: Sat, 29 Oct 2005 13:35:51 GMT

Scott wrote:
> Actually, I think the convention is LSB below 9 MHz and USB above 9 MHz. 
>  That comes from the fact that most old rigs used 9 MHz as the I.F. 
> Doesn't really matter though since our voice bands are 40M and 20M (CW 
> only on 30M), so by convention, we use LSB on 40M and below and USB on 
> 20M and above.  However, one can reverse this if one desires.  It will 
> just confuse new people when they try to tune you in and wonder why they 
> can't get you tuned in...

Yeah, and more than once I've scratched my head about what type of voice 
encryption someone was using in the middle of 20 meters before it dawned 
on me to try listening on LSB<grin>!

The 10MHz figure is somewhat arbitrary since indeed there are no amateur 
voice frequencies between 7.3 and 14.1MHz - and commercial services 
don't follow our LSB/USB convention.

As I understood it, the decision to use different sidebands in the two 
spectrum areas came from the design of some early SSB equipment.  If you 
used a 9MHz IF and a 5.0-5.5MHz VFO, you could cover both 80 and 20 
meters without having to mess with heterodyne oscillators.  But since 
you'd be using addition on 20 vs. subtraction on 80, the sidebands would 
flip.

(there's GOT to be a better way to say that but it's too darned early in 
the morning!)

At the time either there wasn't a phone band yet on 40 or phone 
privileges there were very new & SSBers didn't care that much about it. 
  15 was also very new or non-existant, and I suspect most SSBers didn't 
believe anyone had a receiver stable enough to receive SSB on 28MHz!
-- 
Doug Smith W9WI
Pleasant View (Nashville), TN  EM66
http://www.w9wi.com



Article: 94776 of rec.radio.amateur.homebrew
From: "The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 14:46:17 +0100
Message-ID: <djvuff$5ln$1@news7.svr.pol.co.uk>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com> <11m3gl19ubk2259@corp.supernews.com> <mpmdnd58QYc6aP_eRVn-vA@gbronline.com>


"Cmdr Buzz Corey" <me@that.ten> wrote in message
news:mpmdnd58QYc6aP_eRVn-vA@gbronline.com...
> DrDeath wrote:
> >
> >
> > I don't need to look up any of those items.
> > I am in the process of building a ssb radio to match the linear I built
last
> > year.
>
> Sure you are.

Why? cant you afford to buy one??




Article: 94777 of rec.radio.amateur.homebrew
From: "The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 14:47:23 +0100
Message-ID: <djvuhh$hhi$1@news6.svr.pol.co.uk>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com> <11m3gl19ubk2259@corp.supernews.com> <QtadncqrxfwMa__eRVn-2Q@gbronline.com>

> Care to give some details like what method of SSB generation this here
> radio will use? Will this be a transmitter or tranceiver? What will the
> IF frequency be? To go with your linear? So you are just another law
> breaking cber I see.

Does this mean you think all CB'ers are law breakers???




Article: 94778 of rec.radio.amateur.homebrew
From: "EL84" <el84@nospam.aol.com>
Subject: Re: A, An, or The FAQ
Date: Sat, 29 Oct 2005 17:12:14 +0100
Message-ID: <3shlb4Fo0sp9U1@individual.net>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com>


"Polymath" <aiyr.r.bean@lycos.co.uk> wrote in message 
news:1130583009.229261.45330@g43g2000cwa.googlegroups.com...
> that he resorts to a Japanese ISP to
> get round kill files.
>
Oh dear, I see geography is not a strong point of yours either, how long has 
Taipei been part of Japan. Check again soft arse, working in that Japanese 
labour camp is brainwashing you.




Article: 94779 of rec.radio.amateur.homebrew
From: "jim.gm4dhj" <jim.gm4dhj@ntlworld.com>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com> <dY-dnd-CFNJL8P7eRVn-oQ@giganews.com>
Subject: Re: A, An, or The FAQ
Message-ID: <_DN8f.7718$sA4.4104@newsfe2-win.ntli.net>
Date: Sat, 29 Oct 2005 16:42:34 GMT


> And I'm afraid you shouldn't have messed with me, I don't forget...
> -- 
> huLLy

yes you do...... 




Article: 94780 of rec.radio.amateur.homebrew
From: Jock. <real_classs_a@yahoo.co.uk>
Subject: Re: A, An, or The FAQ
Date: Sat, 29 Oct 2005 16:54:00 +0000
Message-ID: <28a7m1llsmgsbjhrrbv55935nn0and8kie@4ax.com>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com> <3shlb4Fo0sp9U1@individual.net>

On Sat, 29 Oct 2005 17:12:14 +0100, "EL84" <el84@nospam.aol.com> wrote:

>Oh dear, I see geography is not a strong point of yours either, how long has 
>Taipei been part of Japan.

It used to be part of Japan ...

-- 

73 de Jock.

"You will always find that those who are most apt to
boast of national merit, have little or no merit of
their own to depend on". -  Oliver Goldsmith.


Article: 94781 of rec.radio.amateur.homebrew
From: "johan aeq" <pe1aeq@amsat.og>
References: <IbF8f.8354$ki7.678793@news20.bellglobal.com>
Subject: Re: Cheap Repeater Controller???
Date: Sat, 29 Oct 2005 19:00:45 +0200
Message-ID: <71819$4363ac6c$52ad139c$30039@news.versatel.nl>

Sorry,
i had a program thar did just the steering you need.
It worked via the soundcard of the computer.
if i can find it i will give you the url.
It also worked as a "parrot repeater".
Greetings Johan PE1AEQ

"Bill" <bcrann1@hotmail.com> schreef in bericht
news:IbF8f.8354$ki7.678793@news20.bellglobal.com...
> I am in the process of building a 2M repeater.  I have everything except
for
> a controller.  I am looking for a cheap controller or a circuit to build
my
> own.  I don't need anything fancy.  Also is there any PC Controller
software
> besides EchoStation?
>
> Bill
>
>




Article: 94782 of rec.radio.amateur.homebrew
From: "jim.gm4dhj" <jim.gm4dhj@ntlworld.com>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com> <dY-dnd-CFNJL8P7eRVn-oQ@giganews.com> <_DN8f.7718$sA4.4104@newsfe2-win.ntli.net> <TuqdnaNPmP9JNP7enZ2dnUVZ_tGdnZ2d@giganews.com>
Subject: Re: A, An, or The FAQ
Message-ID: <GlO8f.7805$sA4.5924@newsfe2-win.ntli.net>
Date: Sat, 29 Oct 2005 17:31:18 GMT


"huLLy" <thisainthamradio@aol.com> wrote in message 
news:TuqdnaNPmP9JNP7enZ2dnUVZ_tGdnZ2d@giganews.com...
> jim.gm4dhj wrote:
>>> And I'm afraid you shouldn't have messed with me, I don't forget...
>>> --
>>> huLLy
>>
>> yes you do......
>
> Oh no I don't!
> -- 
> huLLy

I don't ...you do...... 




Article: 94783 of rec.radio.amateur.homebrew
From: "jim.gm4dhj" <jim.gm4dhj@ntlworld.com>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com> <dY-dnd-CFNJL8P7eRVn-oQ@giganews.com> <_DN8f.7718$sA4.4104@newsfe2-win.ntli.net> <TuqdnaNPmP9JNP7enZ2dnUVZ_tGdnZ2d@giganews.com> <GlO8f.7805$sA4.5924@newsfe2-win.ntli.net> <2eadnRoZ1r8EKf7enZ2dnUVZ_tCdnZ2d@giganews.com>
Subject: Re: A, An, or The FAQ
Message-ID: <YCO8f.23675$65.4812@newsfe6-win.ntli.net>
Date: Sat, 29 Oct 2005 17:49:44 GMT


"huLLy" <thisainthamradio@aol.com> wrote in message 
news:2eadnRoZ1r8EKf7enZ2dnUVZ_tCdnZ2d@giganews.com...
> jim.gm4dhj wrote:
>
>> I don't ...you do......
>
> I hope you're not going on about that tuner.
>
> As you've given up, it would have been a waste of time now, wouldn't it?
> -- 
> huLLy

what tuner ? ..... 




Article: 94784 of rec.radio.amateur.homebrew
From: "jim.gm4dhj" <jim.gm4dhj@ntlworld.com>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com> <dY-dnd-CFNJL8P7eRVn-oQ@giganews.com> <_DN8f.7718$sA4.4104@newsfe2-win.ntli.net> <TuqdnaNPmP9JNP7enZ2dnUVZ_tGdnZ2d@giganews.com> <GlO8f.7805$sA4.5924@newsfe2-win.ntli.net> <2eadnRoZ1r8EKf7enZ2dnUVZ_tCdnZ2d@giganews.com> <YCO8f.23675$65.4812@newsfe6-win.ntli.net> <uqqdnZVn27IeKv7eRVn-hA@giganews.com>
Subject: Re: A, An, or The FAQ
Message-ID: <%fP8f.37338$S_1.34666@newsfe5-win.ntli.net>
Date: Sat, 29 Oct 2005 18:33:31 GMT


"huLLy" <thisainthamradio@aol.com> wrote in message 
news:uqqdnZVn27IeKv7eRVn-hA@giganews.com...
> jim.gm4dhj wrote:
>> "huLLy" <thisainthamradio@aol.com> wrote in message
>> news:2eadnRoZ1r8EKf7enZ2dnUVZ_tCdnZ2d@giganews.com...
>>> jim.gm4dhj wrote:
>>>
>>>> I don't ...you do......
>>>
>>> I hope you're not going on about that tuner.
>>>
>>> As you've given up, it would have been a waste of time now, wouldn't
>>> it? --
>>> huLLy
>>
>> what tuner ? .....
>
> Never attempt a coherent argument with an incoherent scotsman
> -- 
> huLLy
> Mobile phone 07976 123278
> ICQ 136-987-925
> 




Article: 94785 of rec.radio.amateur.homebrew
From: "jim.gm4dhj" <jim.gm4dhj@ntlworld.com>
References: <1130581695.118149.40220@g47g2000cwa.googlegroups.com> <1130583009.229261.45330@g43g2000cwa.googlegroups.com> <dY-dnd-CFNJL8P7eRVn-oQ@giganews.com> <_DN8f.7718$sA4.4104@newsfe2-win.ntli.net> <TuqdnaNPmP9JNP7enZ2dnUVZ_tGdnZ2d@giganews.com> <GlO8f.7805$sA4.5924@newsfe2-win.ntli.net> <2eadnRoZ1r8EKf7enZ2dnUVZ_tCdnZ2d@giganews.com> <YCO8f.23675$65.4812@newsfe6-win.ntli.net> <uqqdnZVn27IeKv7eRVn-hA@giganews.com>
Subject: Re: A, An, or The FAQ
Message-ID: <EgP8f.37339$S_1.33443@newsfe5-win.ntli.net>
Date: Sat, 29 Oct 2005 18:34:12 GMT


"huLLy" <thisainthamradio@aol.com> wrote in message 
news:uqqdnZVn27IeKv7eRVn-hA@giganews.com...
> jim.gm4dhj wrote:
>> "huLLy" <thisainthamradio@aol.com> wrote in message
>> news:2eadnRoZ1r8EKf7enZ2dnUVZ_tCdnZ2d@giganews.com...
>>> jim.gm4dhj wrote:
>>>
>>>> I don't ...you do......
>>>
>>> I hope you're not going on about that tuner.
>>>
>>> As you've given up, it would have been a waste of time now, wouldn't
>>> it? --
>>> huLLy
>>
>> what tuner ? .....
>
> Never attempt a coherent argument with an incoherent scotsman
> -- 
> huLLy

what tuner ? ...... 




Article: 94786 of rec.radio.amateur.homebrew
From: "The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 20:41:03 +0100
Message-ID: <dk0j8s$let$1@news7.svr.pol.co.uk>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com> <11m3gl19ubk2259@corp.supernews.com> <QtadncqrxfwMa__eRVn-2Q@gbronline.com> <djvuhh$hhi$1@news6.svr.pol.co.uk> <a6adnYBSCIIWM_7enZ2dnUVZ_s6dnZ2d@gbronline.com>


"Cmdr Buzz Corey" <me@that.ten> wrote in message
news:a6adnYBSCIIWM_7enZ2dnUVZ_s6dnZ2d@gbronline.com...
> The Magnum wrote:
> >>Care to give some details like what method of SSB generation this here
> >>radio will use? Will this be a transmitter or tranceiver? What will the
> >>IF frequency be? To go with your linear? So you are just another law
> >>breaking cber I see.
> >
> >
> > Does this mean you think all CB'ers are law breakers???
> >
> >
>
> No, not all chicken banders are law breakers, but a very large portion
are.
>
> If Dr IQ is running an external linear he certainly is. If he is going
> to build a cb transmitter, which will not be type accepted and put it on
> the air he certainly will be.

Type approved.... hmm, its a bit of a strange one that ... which makes me
think "type approved" for Amateur is something home made from bits of
anything.... not tested by anyone... just soldered together by an Amateur so
it must be perfect ...right? No spurious emmisions or any interference
because the person cobbling it together is an Amateur...... Now no
disrespect here is aimed at Amateurs, just some of the laws governing the
hobby seem to be crazy. Amateurs building their own kit and having it tested
via some professional body before use i can accept.... but does that ticket
mean you can build your own "boots" and use it no matter how bad it may be
made? It seems so..... sod type approval eh. Or were you just relating to
"licence conditions"
I know a few Amateurs who are law breakers too. Using their illegally
adapted Amateur equipment to listen in to CB frequencies i believe is a NO
NO, unless you have a CB licence... to which would Amateurs actually bother
to get a CB licence? Are the radios actually legal to use on the CB bands??
i dont know 100% so i ask the question. We all do things from time to time
that are deemed illegal.... so your statement on "No, not all chicken
banders are law breakers, but a very large portion are" could be said
against any group of people.

Whats your opinion on M3's? Do you encorage them or see them as a stain on
Amateur radio? Im just curious by the way.

Regards,
Graham





Article: 94787 of rec.radio.amateur.homebrew
From: Polymath <aiyr.r.bean@lyos.co.uk>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 17:12:27 -0400
Message-ID: <ebp7m1h4r4f6eg2v9m1sm5bljg2ek0u5hl@4ax.com>

"huLLy" <thisainthamradio@aol.com> wrote:
> Polymath wrote:
>
> > It's purpose is to fill the coffers of a Brit publishing
> > company, the RSCB - The Radio Society for Citizen's Band.
> >
>
> It's 'its' you fuckwit!
>
Thanks for correcting me....I'm a dumbass.












G4SDW 
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Article: 94788 of rec.radio.amateur.homebrew
From: Nedlar <Sam@Techno.invalid>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 23:47:24 +0100
Message-ID: <etu7m19r639tn6a2v9j3teb8vkf9jpok43@4ax.com>
References: <WJCdnaayK53mTcLeRVn-iA@gbronline.com>   <11m1uj3tniis6b5@corp.supernews.com>   <NaCdnWeH65OynvzeRVn-gA@gbronline.com>   <11m3gl19ubk2259@corp.supernews.com>   <QtadncqrxfwMa__eRVn-2Q@gbronline.com>   <djvuhh$hhi$1@news6.svr.pol.co.uk>   <a6adnYBSCIIWM_7enZ2dnUVZ_s6dnZ2d@gbronline.com>   <dk0j8s$let$1@news7.svr.pol.co.uk>   <t9SdnSFdvdD_QP7eRVn-tg@gbronline.com> <1130618638.849629.218260@o13g2000cwo.googlegroups.com> <5vqdnbys6tnhff7enZ2dnUVZ_tCdnZ2d@giganews.com>

On Sat, 29 Oct 2005 21:50:03 +0100, "huLLy" <thisainthamradio@aol.com>
wrote:


>It's 'its' you fuckwit!

Why don't you correct your CB chum Magnum?
His postings are typical of the semi-literate, brain-dead CBr.


Article: 94789 of rec.radio.amateur.homebrew
From: "The Magnum" <magnum@NOSPAMmag2781.freeserve.co.uk>
Subject: Re: FAQ
Date: Sun, 30 Oct 2005 00:01:02 +0100
Message-ID: <dk0v07$pjq$1@newsg2.svr.pol.co.uk>
References: <1129903535.253354.121770@g47g2000cwa.googlegroups.com>   <k5uhl1pm9kmh9ojl2a1s7mcjgvuqki1fai@4ax.com> <1129905039.542653.237720@f14g2000cwb.googlegroups.com> <djbb26$2eb$1@newsg1.svr.pol.co.uk> <56mil11d1o9mpajvcsq8fnfocq43gv0te1@4ax.com> <11loti63r2mj524@corp.supernews.com> <rPadnWnAaYiN1sDeRVn-pw@gbronline.com> <djlkg8$8rh$1@newsg4.svr.pol.co.uk> <11lu184i0245b71@corp.supernews.com> <WJCdnaayK53mTcLeRVn-iA@gbronline.com> <11m1uj3tniis6b5@corp.supernews.com> <NaCdnWeH65OynvzeRVn-gA@gbronline.com> <11m3gl19ubk2259@corp.supernews.com> <QtadncqrxfwMa__eRVn-2Q@gbronline.com> <djvuhh$hhi$1@news6.svr.pol.co.uk> <a6adnYBSCIIWM_7enZ2dnUVZ_s6dnZ2d@gbronline.com> <dk0j8s$let$1@news7.svr.pol.co.uk> <t9SdnSFdvdD_QP7eRVn-tg@gbronline.com>


"Cmdr Buzz Corey" <me@that.ten> wrote in message
news:t9SdnSFdvdD_QP7eRVn-tg@gbronline.com...
> The Magnum wrote:
> > "Cmdr Buzz Corey" <me@that.ten> wrote in message
> > news:a6adnYBSCIIWM_7enZ2dnUVZ_s6dnZ2d@gbronline.com...
> >
> >>The Magnum wrote:
> >>
> >>>>Care to give some details like what method of SSB generation this here
> >>>>radio will use? Will this be a transmitter or tranceiver? What will
the
> >>>>IF frequency be? To go with your linear? So you are just another law
> >>>>breaking cber I see.
> >>>
> >>>
> >>>Does this mean you think all CB'ers are law breakers???
> >>>
> >>>
> >>
> >>No, not all chicken banders are law breakers, but a very large portion
> >
> > are.
> >
> >>If Dr IQ is running an external linear he certainly is. If he is going
> >>to build a cb transmitter, which will not be type accepted and put it on
> >>the air he certainly will be.
> >
> >
> > Type approved.... hmm, its a bit of a strange one that ... which makes
me
> > think "type approved" for Amateur is something home made from bits of
> > anything.... not tested by anyone... just soldered together by an
Amateur so
> > it must be perfect ...right? No spurious emmisions or any interference
> > because the person cobbling it together is an Amateur...... Now no
> > disrespect here is aimed at Amateurs, just some of the laws governing
the
> > hobby seem to be crazy. Amateurs building their own kit and having it
tested
> > via some professional body before use i can accept.... but does that
ticket
> > mean you can build your own "boots" and use it no matter how bad it may
be
> > made? It seems so..... sod type approval eh. Or were you just relating
to
> > "licence conditions"
>
> Maybe the rules are different where you are, but in the US amateurs can
> construct any of their equipment, but it *is their responsibility* to
> test it and make sure it operates legally. If it doesn't they can be
> held accountable by the FCC. Granted, there are few today, due to lack
> of technical knowledge that can do that. It wasn't that long ago
> however, that finding a ham station completely constructed by the
> amateur wasn't uncommon or often surplus military gear would be modified
> for use on the amateur bands. With the plug-and-talk equipment of today,
> easier test with given answers that can be memorized, the technical
> expertise of the amateur is sadly lacking

Ive seen a few of the ex military gear on my frequent walks around the radio
rally meetings held in the UK at various times of the year. Ive even seen
small tanks for sale :o)

> > I know a few Amateurs who are law breakers too. Using their illegally
> > adapted Amateur equipment to listen in to CB frequencies i believe is a
NO
> > NO, unless you have a CB licence...
>
> In the US any ham or anyone else can legally listen in on cb frequencies.
>
> > to which would Amateurs actually bother
> > to get a CB licence?
>
> Since there is no requirement here for a cb license I don't suppose any
> amateur would bother.
>
> > Are the radios actually legal to use on the CB bands??
>
> Only radios that are type accepted for cb use are legal to use on the cb
> bands. There is a problem here with imported radios that have 'expanded'
> channels that will also operate on the 10 meter ham band. These radios
> are not 'type certified' for cb use and they are purchased by unlicensed
> persons and are often used on the 10 meter band. Some time back it was a
> popular thing for amateurs to take cb radios and convert them for use on
> the 10 meter band, just change the crystals, peak up the circuits and
> you had a nice little mobile 10 meter radio. Once modified as such the
> radios were no longer type certified nor legal for cb use but perfectly
> legal for amateur use.

Indeed. But what i was getting at was Amateur radios that can access the CB
bands not CB's themselves. I know in the UK if an amateur wants to converse
on the 27MHz CB band he needs a CB licence.. his Amateur licence doesnt
cover him/her for it. (or whether thats just M3 im not sure) Im sure someone
will let us know.

> > i dont know 100% so i ask the question. We all do things from time to
time
> > that are deemed illegal.... so your statement on "No, not all chicken
> > banders are law breakers, but a very large portion are" could be said
> > against any group of people.
>
> True, but there is a much larger percentage of illegal operation on the
> cb band than on the amateur bands, at least here in the US. And we have
> the 'freebanders' who for some strange reason think they have the right
> to operate on the frequencies between the upper end of the cb band and
> the lower end of 10 meters plus just about anywhere else they chose.
> >
> > Whats your opinion on M3's? Do you encorage them or see them as a stain
on
> > Amateur radio? Im just curious by the way.
>
> I must confess I haven't acquainted myself with M3's. Is this a test
> free amateur license?

In the UK its a simple test (which only an idiot would fail) to get people
started on the Amateur bands. I think the main frequencies being 2m. Im not
sure where else they can go but its limited compaired to a full amateur and
the powers less. Most UK Amateurs are horrified that their airspace is being
invaded by these "CB type lowlife" (their words not mine) which suprises me
as i firmly believe anyone gaining their M3 licence would go on to
Intermediate... etc not stop there so i cant see why the "old hams" arent
encoraging them rather than belittling them.
http://rsgb.org.uk/beginners/ under foundation

Regards,
Graham




Article: 94790 of rec.radio.amateur.homebrew
From: Jock. <real_classs_a@yahoo.co.uk>
Subject: Re: FAQ
Date: Sat, 29 Oct 2005 23:34:56 +0000
Message-ID: <jn18m1dbft25gtviiae5k49n54828ekkqs@4ax.com>
References: <11m1uj3tniis6b5@corp.supernews.com>   <NaCdnWeH65OynvzeRVn-gA@gbronline.com>   <11m3gl19ubk2259@corp.supernews.com>   <QtadncqrxfwMa__eRVn-2Q@gbronline.com>   <djvuhh$hhi$1@news6.svr.pol.co.uk>   <a6adnYBSCIIWM_7enZ2dnUVZ_s6dnZ2d@gbronline.com>   <dk0j8s$let$1@news7.svr.pol.co.uk>   <t9SdnSFdvdD_QP7eRVn-tg@gbronline.com> <1130618638.849629.218260@o13g2000cwo.googlegroups.com> <5vqdnbys6tnhff7enZ2dnUVZ_tCdnZ2d@giganews.com> <etu7m19r639tn6a2v9j3teb8vkf9jpok43@4ax.com>

On Sat, 29 Oct 2005 23:47:24 +0100, Nedlar <Sam@Techno.invalid> wrote:

>On Sat, 29 Oct 2005 21:50:03 +0100, "huLLy" <thisainthamradio@aol.com>
>wrote:
>
>
>>It's 'its' you fuckwit!
>
>Why don't you correct your CB chum Magnum?
>His postings are typical of the semi-literate, brain-dead CBr.

Yes, but he's a Yank. Illiteracy is expected of them.

-- 

73 de Jock.

"You will always find that those who are most apt to
boast of national merit, have little or no merit of
their own to depend on". -  Oliver Goldsmith.


Article: 94791 of rec.radio.amateur.homebrew
From: "Bill" <bcrann1@hotmail.com>
References: <IbF8f.8354$ki7.678793@news20.bellglobal.com> <71819$4363ac6c$52ad139c$30039@news.versatel.nl>
Subject: Re: Cheap Repeater Controller???
Message-ID: <PHU8f.8606$ki7.742129@news20.bellglobal.com>
Date: Sat, 29 Oct 2005 22:14:46 -0230

Thanks

Bill

"johan aeq" <pe1aeq@amsat.og> wrote in message 
news:71819$4363ac6c$52ad139c$30039@news.versatel.nl...
> Sorry,
> i had a program thar did just the steering you need.
> It worked via the soundcard of the computer.
> if i can find it i will give you the url.
> It also worked as a "parrot repeater".
> Greetings Johan PE1AEQ
>
> "Bill" <bcrann1@hotmail.com> schreef in bericht
> news:IbF8f.8354$ki7.678793@news20.bellglobal.com...
>> I am in the process of building a 2M repeater.  I have everything except
> for
>> a controller.  I am looking for a cheap controller or a circuit to build
> my
>> own.  I don't need anything fancy.  Also is there any PC Controller
> software
>> besides EchoStation?
>>
>> Bill
>>
>>
>
> 




Article: 94792 of rec.radio.amateur.homebrew
From: "xpyttl" <xpyttl_NOSPAM@earthling.net>
References: <neu6f.5518$q%.3129@newssvr12.news.prodigy.com> <wqu6f.4701$i%.795@fed1read07> <gnP6f.3543$D13.3524@newssvr11.news.prodigy.com>
Subject: Re: Ham radio kits
Message-ID: <PVU8f.5313$7s1.3181@fe04.lga>
Date: Sat, 29 Oct 2005 20:59:23 -0400

Jatin

There are all sorts of kit vendors out there.  www.qrqrci.org has quite an 
extensive list.  But I would agree with Lector, if the price of the Elecraft 
doesn't scare you off, it is a really great radio ... any one of them.

Notice that they are really for different users.  The KX1 is designed to be 
"trail-friendly".  By that they mean not only small and light, but 
convenient if you are sitting on a log.  The K1 is a nice portable rig, and 
with the internal tuner and batteries, it is a great hotel-room or picnic 
table rig.  The K2 is more of a base rig, although lots and lots of folks 
use them portable.  To many people, the K2 is the "ultimate" rig.

..

"Jatin" <TripleDerby100-ng@yahoo.com> wrote in message 
news:gnP6f.3543$D13.3524@newssvr11.news.prodigy.com...
> Thanks. Just what I was looking for!
>
> Jatin
> ==========
>
>
>
>
> Caveat Lector wrote:
>> Lots of Ham Radio kits available at URL:
>> http://ac6v.com/kits.htm#HAM
>>
>> Many different vendors
>>
>> If you can afford it and have the time -- try an Elecraft -- great 
>> transceiver
>> http://www.elecraft.com/
>> 




Article: 94793 of rec.radio.amateur.homebrew
From: "xpyttl" <xpyttl_NOSPAM@earthling.net>
References: <u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com>
Subject: Re: 20meter propagation question...
Message-ID: <zaV8f.5317$7s1.847@fe04.lga>
Date: Sat, 29 Oct 2005 21:17:15 -0400

Jim

20 meters is mostly a daytime band, especially now that we are near the 
bottom of the sunspot cycle.  What that means, though, is daylight at 
midpath, and on 20, paths tend to be long (even for QRP).  So if the sun is 
overhead say, 500 miles from you, there is a decent chance of hearing 
something.

Depending on how far up in 9-land you are, 20 may close fairly early. 
However, up here in the frozen north, there is often over the pole 
propagation that seems to open up an hour or two after the band "closes".

If you listen during the day, you will hear the signals shift from the east 
to the west with the sun.  When all you can hear is California, the band 
will probably be closing soon.  But then again, depending on all sorts of 
vagaries, it may soon be time to listen for Hawaii, Japan or Australia.

Don't be afraid to make a call.  On 20 CW, 5 watts is more than enough.  20 
is a fairly quiet band, and QRP signals don't get absorbed the way they do 
on the lower frequencies.  Once I tried a contest at a half a watt, and my 
QSO rates were barely different than at 5 which in turn really weren't 
noticably different than 100.  They did fall off as I started to approach a 
tenth, though.  This is with a dipole at about 30 feet - nothing fancy.

Early morning is nice for Europe.  Midday the states.  Sunset look for South 
America.

If you keep an eye on the propagation numbers, here are a few clues.  The 
"flux" as it applies to 20 really has to do with how CLOSE you can talk. 
You will find that contacts closer than about 500 miles are tough on 20 
unless the flux is high.  A high flux might also help 20 stay open a little 
longer after the sun sets.  The K index jumping tends to indicate that we 
have taken a hit from a burp the sun has made.  An intial rapid rise will 
mean the bands will be very noisy for a short while, but in an hour or two 
propagation will suddenly get very good for a little while.  Then, a few 
days later, we -might- get hit with the follow on, which will essentially 
shut things down for a day.  Whether we get hit depends on the exact place 
on the sun that burped.  The initial radiation blast travels very quickly to 
earth, and the matter that follows takes a lot longer.  Thats why the 
multi-day delay.  The initial radiation blast causes the earth's magnetic 
field to rock and roll for a few hours, which is why the noise.  When it 
settles down, though, the ionosphere is ionized as if the flux were high. 
Then when the matter reaches earth (if it does) it will badly distort the 
magnetic field for a day or sometimes more, making for very bad conditions.

If you can find some writings by Paul Harden, read them.  This guy has lots 
of great stuff on propagation.

..

"J Shrum" <shrumj@madisontelco.com> wrote in message 
news:u5qdnYCt0JA2HMDeRVn-tQ@madisontelco.com...
> Greetings. I've only been a ham for a couple years. Not really done 
> anything
> w/ it however. Just homebrewed a thing or two, but never made any QSO's. I
> just acquired a 5w 20m rig (all my budget could allow).
> Can someone give me any tips on how to know when 20m is open? What time of
> year or time of day is typically good for 20?
> I tried looking over some MUF charts... but its greek to me at this point.
> I've tried googling, but unless I know exactly how to phrase my search, 
> I'm
> coming up empty...
>
> Any pointers would be great.
> Thanks
> Jim
> KC9FFX
> 




Article: 94794 of rec.radio.amateur.homebrew
From: Jatin <TripleDerby100-ng@yahoo.com>
Subject: Re: Ham radio kits
References: <neu6f.5518$q%.3129@newssvr12.news.prodigy.com> <wqu6f.4701$i%.795@fed1read07> <gnP6f.3543$D13.3524@newssvr11.news.prodigy.com> <PVU8f.5313$7s1.3181@fe04.lga>
Message-ID: <wsW8f.9972$tV6.8142@newssvr27.news.prodigy.net>
Date: Sun, 30 Oct 2005 02:44:44 GMT

xpyttl wrote:
> Jatin
> 
> There are all sorts of kit vendors out there.  www.qrqrci.org has quite an 
> extensive list.  But I would agree with Lector, if the price of the Elecraft 
> doesn't scare you off, it is a really great radio ... any one of them.

Is there a typo in the url that you mentioned? I couldn't connect to it.

> Notice that they are really for different users.  The KX1 is designed to be 
> "trail-friendly".  By that they mean not only small and light, but 
> convenient if you are sitting on a log.  The K1 is a nice portable rig, and 
> with the internal tuner and batteries, it is a great hotel-room or picnic 
> table rig.  The K2 is more of a base rig, although lots and lots of folks 
> use them portable.  To many people, the K2 is the "ultimate" rig.

I am considering Elecraft, hopefully that would be a Christmas gift :)

Jatin
=================


Article: 94795 of rec.radio.amateur.homebrew
From: James Skalski <jskalski@yahoo.com>
Subject: wanted: Cardwell-Johnson capacitor
Message-ID: <R159f.6046$lg7.5020@trndny02>
Date: Sun, 30 Oct 2005 14:47:13 GMT

I need a Cardwell Johnson 153-6-1 air variable
36-496pF  3500VDC
Please state condition and price.
Jim n2go


Article: 94797 of rec.radio.amateur.homebrew
From: nospam@nouce.bellatlantic.net
Subject: Re: Shunt feedback in broadband RF amps
Message-ID: <289cm1tajo90dbe0auh3e451kp41h0d08f@4ax.com>
References: <1129701535.404399.192870@f14g2000cwb.googlegroups.com> <l5qajd.ne1.ln@tg6124.ab0wr.net> <1130224504.589121.286790@o13g2000cwo.googlegroups.com> <sirmjd.sg1.ln@tg6124.ab0wr.net> <1130740987.959950.273460@g47g2000cwa.googlegroups.com>
Date: Mon, 31 Oct 2005 14:11:25 GMT

On 30 Oct 2005 22:43:07 -0800, meara.london@virgin.net wrote:

>Tim: Thanks again for your help, and thanks again to all the others
>who've replied to my question.
>
>I see what you are saying.  I reached back to Terman's description of
>these kinds of feedback netwoks in tube circuits.  I think he describes
>just what you are presenting (but I think your presentation is
>clearer!)
>
>Obviously I'm still struggling with some very basic amplifier issues.
>Am I correct in thinking that shunt feedback would have a number of
>different advantages in a common emitter transistor amp?  Looks to me
>like the feedback network would give the designer the chance to:
>1). Manipulate the input and output impedances
>2). Counteract the tendency of the amp to "take off" becasue of the
>rising gain characteristic (as frequency is lowered).
>3). Reduce any distortion (IMD) generated in the amplifier itself.
>
>I'm most shaky on #3.  Am I correct in thinking that if you have some
>sort of spur or IMD product generated in the amp itelf (say in the
>collector circuit)the negative feedback provided by the shunt tends to
>nock some (most? all?) of this distortion down?

#3)
Negative feedback of any kind then to make a circuit with nonlinear
action (however small it may be) more linear.   IMD (InterModulation
Distortion) is a mixing action from nolinearity that occurs when two
signals are passing through an amplifier that has distortion, less
distortion, less IMD.

Allison
KB!GMX







Article: 94798 of rec.radio.amateur.homebrew
From: Manuel Presnitz <mpy@gmx.net>
Subject: WTB: M32(A) Module for Wavetek 3001
Date: 31 Oct 2005 15:11:45 GMT
Message-ID: <3smqhhFoukrpU1@news.dfncis.de>

I am searching a working M32 or M32A Module for the Wavetek 3001 Signal 
Generator.

Or if you have an entire Wavetek 3001 that you may not be using, or wish to 
dispose of, I'm interested, too - at a reasonable price.

Please contact me, if you can help: mpy@gmx.net


Thanks in advance,
Manuel DO1MPY


Article: 94799 of rec.radio.amateur.homebrew
From: "Paul van Dam" <p.h.m.van.dam@hccnet.nl>
Subject: Permeability tuned inductors
Date: Mon, 31 Oct 2005 21:39:53 -0000
Message-ID: <436680ee$0$11070$e4fe514c@news.xs4all.nl>

Looking for a source of permeability tuned inductors.

Don't know wether these are still manufactured these days.
25 years ago most high end VFO's (or PTO's) had these inductors, eg Collins,
Drake etc.
Also heavily used in construction of analog car radio's.

Regards,

Paul van Dam, PA7UL




Article: 94800 of rec.radio.amateur.homebrew
From: James Skalski <jskalski@yahoo.com>
Subject: Defibrillator caps for ham use?
Message-ID: <siz9f.5733$cg6.5357@trndny04>
Date: Tue, 01 Nov 2005 01:12:56 GMT

Has anyone use a oil filled cap from a debrillator for a high voltage 
amplifier?  What are the differences in this cap?

Jim n2go


Article: 94801 of rec.radio.amateur.homebrew
From: tim gorman <tgorman2@cox.net>
Subject: Re: Shunt feedback in broadband RF amps
References: <1129701535.404399.192870@f14g2000cwb.googlegroups.com> <l5qajd.ne1.ln@tg6124.ab0wr.net> <1130224504.589121.286790@o13g2000cwo.googlegroups.com> <sirmjd.sg1.ln@tg6124.ab0wr.net> <1130740987.959950.273460@g47g2000cwa.googlegroups.com>
Message-ID: <6vj6kd.3nb.ln@tg6124.ab0wr.net>
Date: Mon, 31 Oct 2005 20:29:58 -0600

meara.london@virgin.net wrote:

> 
> 
> Tim: Thanks again for your help, and thanks again to all the others
> who've replied to my question.
> 
> I see what you are saying.  I reached back to Terman's description of
> these kinds of feedback netwoks in tube circuits.  I think he describes
> just what you are presenting (but I think your presentation is
> clearer!)
> 
> Obviously I'm still struggling with some very basic amplifier issues.
> Am I correct in thinking that shunt feedback would have a number of
> different advantages in a common emitter transistor amp?  Looks to me
> like the feedback network would give the designer the chance to:
> 1). Manipulate the input and output impedances
> 2). Counteract the tendency of the amp to "take off" becasue of the
> rising gain characteristic (as frequency is lowered).
> 3). Reduce any distortion (IMD) generated in the amplifier itself.
> 
> I'm most shaky on #3.  Am I correct in thinking that if you have some
> sort of spur or IMD product generated in the amp itelf (say in the
> collector circuit)the negative feedback provided by the shunt tends to
> nock some (most? all?) of this distortion down?
> 
> Thanks, 73
> Bill M0HBR N2CQR CU2JL
> http://www.qsl.net/n2cqr
> 
> 
> 

Bill,

Negative feedback can be used to help fix input and output impedances. You
have to be careful with shunt type negative feedback to make sure you don't
have any regions where the phase change becomes 0deg. This can happen when
you have both capacitive and inductive reactances in the circuit. That is
one reason parasitic oscillations happen at very high frequencies. Even
connecting wires on resistors can look like inductors at very high
frequencies.

As far as negative feedback having an impact on distortion, you must be very
careful to identify what kinds of distortion you are speaking of and have a
good feel for what the feedback networks are doing. Negative feedback,
improperly designed, can cause audio amplifiers to not be "flat" across the
audio spectrum. This can be considered to be distortion.

Negative feedback, improperly applied can cause gain compression, e.g. in an
RF Linear Amplifier, which distorts the dynamic range of the applied
modulation causing a distortion which impacts intelligibility. 

IMD distortion is typically caused by a non-linear device. Since a
transistor is an inherently non-linear device (it is based on "diode"
junctions) at low voltage levels since it acts like an on-off switch, there
will always be some level of IMD that negative feedback won't help. 

Where negative feedback *can* help is in keeping a Class A amplifier
operating in the Class A region. This will minimize IMD. If you get an
amplifier out of the Class A region, there is bound to be some IMD. If you
are running a Class B amplifier in push-pull this is a "psuedo" Class A
amplifier and negative feedback that would keep each amplifer right at
cutoff for the negative part of the input would help minimize IMD
distortion. If you are running a Class C amplifier, negative feedback won't
help much because you are running a non-linear amplifer to begin with.

Hope this helps.

tim ab0wr



Article: 94802 of rec.radio.amateur.homebrew
From: "Bill" <bcrann1@hotmail.com>
Subject: Standard GX3000 Programming???
Message-ID: <d_C9f.3781$J14.193229@news20.bellglobal.com>
Date: Tue, 1 Nov 2005 01:54:45 -0330

Can anyone tell me how to change the programming of a GX3000 with a standard 
EPROM programmer.  I had the instructions but lost them during a move.  It 
was something like take the frequency multiply by 45?? convert to hex and 
add an zero???  Something along those lines.  Thanks in advance.

Bill