Article: 97618 of rec.radio.amateur.homebrew From: David Subject: Re: Matching to Crystal Filter References: <1149479064.193604.313210@g10g2000cwb.googlegroups.com> <6DOgg.3511$ap3.1380@news-server.bigpond.net.au> <1149555185.183482.145350@i40g2000cwc.googlegroups.com> <0N5hg.4093$ap3.1712@news-server.bigpond.net.au> <1149589731.458222.322640@c74g2000cwc.googlegroups.com> Message-ID: Date: Wed, 07 Jun 2006 05:03:24 GMT Jim, I have RFsim99. Do you have an example model for the filter ? thanks David Jim wrote: > David wrote: >> Andy, >> >> Thanks. I am using single-ended output from the SA602 as well as for the >> SA605 input. I decouple the unused output/input with 100n Cap in each >> case. >> >> How do you know the match is working correctly ? My concern is that when >> I build the circuit and sweep it with a sig gen and tune it for peak, >> how do I know the match to is correct in the first place. >> >> Regards >> >> David >> > > > > > For RF matching and filter responses, I like to use RFSIMM99 which is an > impedance analysis program using Sparameters. > > The Sparameters are generally for active devices, but it also does a nice > job with resistors, inductors, and capacitors. One trick it has is a > tolerance analysis routine using monte carlo to choose randomg component > tolerances. Very useful when testing to see if a particular circuit is > likely to be tempermental, or if it will tolerate component variation..... > > Just do a websearch for RFSIMM99 and you will find the program, it is > freeware. > > > > Jim Pennell > N6BIU > > > Article: 97619 of rec.radio.amateur.homebrew From: David Subject: Re: Matching to Crystal Filter References: <1149479064.193604.313210@g10g2000cwb.googlegroups.com> <6DOgg.3511$ap3.1380@news-server.bigpond.net.au> <1149555185.183482.145350@i40g2000cwc.googlegroups.com> <0N5hg.4093$ap3.1712@news-server.bigpond.net.au> <1149589731.458222.322640@c74g2000cwc.googlegroups.com> <1149590567.761761.284670@y43g2000cwc.googlegroups.com> Message-ID: Date: Wed, 07 Jun 2006 05:51:07 GMT Andy, What did you use to measure the voltage on the top of the tank ? I have a 300MHz scope but the probe still seems to load down the circuit being measured. Thanks Regards David Andy wrote: > Andy write: > > I found an App note on the web that will > show you how to use it. > > > http://www.ece.utah.edu/~cfurse/microwave/LECTURE/L15/L15.html > > You can probly find more by doing a google search on : > > " Rp Impedance Matching " > Article: 97620 of rec.radio.amateur.homebrew From: Alan Peake Subject: Re: Identifying Surplus Toroid Material Date: Wed, 07 Jun 2006 18:29:07 +1000 Message-ID: <44868E53.7030408@killspam.internode.on.net> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> <98GdnbXiy_p29hjZnZ2dnUVZ8qqdnZ2d@pipex.net> <-JqdnTLcL5XQWBjZRVnyjQ@bt.com> <128bigq9gr415d4@corp.supernews.com> Bob Furtaw wrote: > Hams can not design good Q circuits. I always hear them complaining on the > air. I hear "a lousy Q, a lousy Q" followed by their call signs. :-) Love it!! Actually, I measure Q by the following Method (for ferrite or iron powder cores): First, wind about 10 turns on the toroid. Then put a capacitor across it - preferrably a 1% mica or similar. Now, connect to a signal generator via a non-inductive resistor, put an oscilloscope (preferrably with a X10 probe) across the parallel tuned circuit and find the resonant frequency Fr. Add a smaller amount of capacitance across the circuit and re-measure the Fr. Measure the signal generator voltage and the voltage across the tuned circuit at resonance. Now you have all the data necessary to calculate the inductance, stray capacitance and Q. Vary the resistor so that the voltage drop across it at resonance is about the same as the voltage across the tuned circuit to maximise the measuement of Q. If the Q is lower than expected, try a range of Fr by changing the number of turns and/or the resonating capacitance. How accurate is this? Good enough for my purposes :) 73 de Alan VK2ADB Article: 97621 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Identifying Surplus Toroid Material Date: Wed, 07 Jun 2006 01:39:57 -0700 Message-ID: <128d470n782a25b@corp.supernews.com> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> <98GdnbXiy_p29hjZnZ2dnUVZ8qqdnZ2d@pipex.net> <-JqdnTLcL5XQWBjZRVnyjQ@bt.com> <128bigq9gr415d4@corp.supernews.com> Reg Edwards wrote: > There is a coil. > It is 1" in diameter. > It is 2" long. > It has 20 turns. > > How accurately can coil Q be determined at 30 MHz? > > (1) Using an Autec antenna analyser? > (2) Using the best commercially available instrument. Those are good questions, although not particularly germane to the current discussion. A toroid is much easier to measure than an air core inductor with fair accuracy, since the field is largely confined. What makes solenoidal coils relatively difficult is the problem of avoiding coupling to the measuring device and nearby objects. I'll mention again that ferrites are most commonly used at RF for wideband transformers, baluns, and EMI suppression. In those applications, Q is typically very low (1 or less) and generally immaterial. To answer the question, though, I first note that your program predicts a Q of about 500 for this coil, with a Z of about 960 ohms and an ESR of about 1.4 ohms at 30 MHz. If it's correct, an antenna analyzer would be poor choice for measuring it for several reasons -- poor accuracy at that high an impedance, poor resolution of the ESR, and residual resistance in the measuring device. So probably +/- 50% would be wishful thinking. On the other hand, a good Q meter might make 20% if you could get the coil far enough away from the fixture, and I could probably do around 30% with my GR impedance bridge. But what's the point you're trying to make? Roy Lewallen, W7EL Article: 97622 of rec.radio.amateur.homebrew Message-ID: <4486C69D.EEADB75A@coaxguy.net> From: Oscar Subject: Re: High Quality Coax Connectors & Adapters atvery low prices References: Date: Wed, 07 Jun 2006 12:29:17 GMT I don't see the original posts, I filter them out put sales@aaarfproducts.com in sender field put AAA RF in subject field and no more of the ads. coax guy Article: 97623 of rec.radio.amateur.homebrew From: MAc Subject: Re: Good IC-based CW transmitter/reciever? Date: Wed, 07 Jun 2006 22:43:18 +0200 Message-ID: References: <1149707873.537462.90360@j55g2000cwa.googlegroups.com> dave.harper wrote: > I've been doing some browsing on the net, but I'm having trouble > finding a schematic for a good IC-based transmitter/reciever for CW (or > RTTY, AMTOR, etc). Does anyone know of a good circuit/schematic for > this? Simple or complicated? Mono or multiband? If you need something simple and monoband just look for "Aquarius" by sp5ddj ( www.qsl.net/sp5ddj/ ) Over 100 working. MAc Article: 97624 of rec.radio.amateur.homebrew From: "Mitchell" Subject: 8875 Date: Thu, 8 Jun 2006 14:29:36 -0400 Message-ID: Are there any replacement tubes available that are pin compatible with the 8875. I have the Dentron 2500. Thanks, Mitchell Article: 97625 of rec.radio.amateur.homebrew From: nospam@nouce.bellatlantic.net Subject: Re: Modulated VXO + IF = HF FSK transmitter? Message-ID: <2hqg825obq5mg4tl6h6ts59m063i3c5m01@4ax.com> References: Date: Thu, 08 Jun 2006 18:38:14 GMT On Thu, 08 Jun 2006 01:44:30 -0500, Ben Jackson wrote: >I've been brainstorming ways to make a cheap HF APRS beacon. HF APRS >is on 10.151, or more precisely, mark = 10.149.200 and space = 10.149.400. >It occured to me that if I had an appropriate crystal, FSK could be >a simple matter of driving two different voltages into a VXO. Of >course it's not easy to find a suitable crystal. I grabbed the list of >all crystals on Digikey and paired them up and sorted for the best >pairs producing mixer products near 10.149. The most promising combo >is 25MHz - 14.85MHz = 10.150MHz requiring 800Hz worst case pull to MARK >which is .006% of 14.85MHz. > >So the idea is to use something like SA602A with the 25MHz LO and a >VXO driven by a microcontroller providing a ~14.85MHz "IF" with the >FSK signal (300 baud packet). > >Has anyone tried something similar? Yes direct FM for a special project (not ham) years ago and it was very good. >I'm not sure if the VXO will >slew fast enough or accurately enough. I'm also wondering if a one- >time calibration of the VXO voltages would keep the output accurate >enough for a normal radio+TNC setup to consistently receive it. It will. I've built many FM transmitters using crystal control and FM via varactor applied to the crystal. Slew rate is not a problem. Accuracy is a matter of maintaining control. Pulling either crystal 200hz is a trivial matter and even pulling them .01% is not difficult. The best way to change crystal frequency accuratly and repeatably is to use a doide (1n4148 will do well) and a series cap(air variable for stability). The diode is use as a saturated switch and will essentially switch in the CAPin or out and thereby lower the frequency repeatably with very little sensitvity to the diodes characteristics. Many older transceivers used such a circuit in the BFO or VFO to get a fixed offset for TX or RX only. >Any ideas appreciated! One problem I forsee is that those crystals will drift as they age and they are usually 50ppm types that are not great at temperature stability. The aging problem is a matter of resetting things after a month or of operation, they will drift less over time. The temperature sensitivity is a matter of keeping a resonably constant temperature (+-10degrees F should do). Any crystal controlled TX (or RX) will have the the crystal aging drift. It's likely many forget this. Old landmobile radio techs know of this and remember it less than fondly. Allison Article: 97626 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Identifying Surplus Toroid Material Date: Fri, 09 Jun 2006 02:52:25 -0700 Message-ID: <128ih6tr5d8np4c@corp.supernews.com> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> <98GdnbXiy_p29hjZnZ2dnUVZ8qqdnZ2d@pipex.net> <-JqdnTLcL5XQWBjZRVnyjQ@bt.com> <128bigq9gr415d4@corp.supernews.com> <44868E53.7030408@killspam.internode.on.net> A couple of people have mentioned how they do inductor Q measurement. Here's how I do it: I make a parallel tuned circuit with the inductor and an air variable capacitor. I've found that even mica capacitors often have a low enough Q to affect the measurement of reasonable Q inductors. The variable C also lets me do the measurement at the frequency of interest. I couple into and out of the parallel circuit with 1 pF capacitors, connecting one to a signal generator and the other to a 50 ohm termination and a scope. (If you calculate the parallel equivalent of the coupling cap and terminating resistor, you'll find that you need either a low or very high value of termination to avoid affecting the measurement.) I've now got a signal generator with a digital frequency readout, but I used to use an old high level generator which I tapped into in order to hook up a frequency counter. I peak the scope signal at the frequency of interest. Then I vary the frequency slightly and find the precise center frequency and the -3 dB frequencies. The Q is simply the center frequency divided by the 3 dB bandwidth. For ease in making measurements, I built a simple 3 dB switchable attenuator and put it in line with the signal generator, terminating the output in 50 ohms at the Q meter so the attenuator would work properly. I measure the center frequency with the attenuator in, then switch it out and find the -3 dB frequencies by adjusting the frequency for the same output level as before. If you use the attenuator, the detector doesn't have to be linear, so you could do away with the scope and use just about any kind of detector like a diode and DVM. Using this method I get within about 10% of an HP Q meter at HF, at least up to a Q of 300 or so, which is about the best I usually get with a powdered iron toroid core. Roy Lewallen, W7EL Article: 97627 of rec.radio.amateur.homebrew From: "Steve N." Subject: Re: 8875 Date: Fri, 9 Jun 2006 10:15:53 -0500 Message-ID: References: I don't believe there is a direct replacement. There is / was, on the web, a mod to use another less expensive 4CX400A. It was writen by Bob Alper, W6KT in 1996. It replaces the tube sockets Seems do be dead now: http://www.svetlana.com/docs/TechBulletins/technoteNo14.html Goran, SM2YER, lists other mods, but the links were too slow to respond for me to look at them. http://support2.overkalix.se/~sm2yer/shack/amp_mla2500/ Ahhhh! Here it is from a Google search 6/9/2006: T R U S T G O O G L E ! ! http://dk9ip.ba-karlsruhe.de/pdf/mla2500/technoteNo14.html Do a search on "Dentron MLA2500 Alper". Maybe it's still somewhere. I have a soft copy. Here's an excerpt: The major problem for MLA-2500 owners is that there is no economical source for the 8875 tubes used as the active amplifiers. For under $350 including sockets and tubes, the amplifier can be converted to run two Svetlana Electron Devices, Inc. 4CX400A tetrodes. (The price of a Svetlana 4CX400A is $140.) . In performing the conversion, five specific needs must be addressed. These are: - Modification of the final amplifier tube area. - Adding a screen power supply. - Meter switching board change. - Adding a bias power supply. - Installing the passive input grid circuit. 73, Steve, K9DCI "Mitchell" wrote in message news:aa250$44886c95$471c706c$28099@ALLTEL.NET... > Are there any replacement tubes available that are pin compatible with the > 8875. I have the Dentron 2500. > > Thanks, > Mitchell > > Article: 97628 of rec.radio.amateur.homebrew From: Alan Peake Subject: Re: Identifying Surplus Toroid Material Date: Sat, 10 Jun 2006 17:44:26 +1000 Message-ID: <448A785A.2070505@killspam.internode.on.net> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> <98GdnbXiy_p29hjZnZ2dnUVZ8qqdnZ2d@pipex.net> <-JqdnTLcL5XQWBjZRVnyjQ@bt.com> <128bigq9gr415d4@corp.supernews.com> <44868E53.7030408@killspam.internode.on.net> <128ih6tr5d8np4c@corp.supernews.com> Roy Lewallen wrote: > A couple of people have mentioned how they do inductor Q measurement. > Here's how I do it: ........ Good method. I have done that before but my current RF sig gen doesn't have very good output level regulation, nor is the output adjustable - it's only a one-transistor sig gen after all:) They wouldn't let me take my H-P with me when I retired :(] Alan Article: 97629 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Identifying Surplus Toroid Material Date: Sat, 10 Jun 2006 03:11:01 -0700 Message-ID: <128l6lmegnj5a1c@corp.supernews.com> References: <1148854357.331638.81030@y43g2000cwc.googlegroups.com> <447D4641.4020705@killspam.internode.on.net> <44853980.1010105@killspam.internode.on.net> <98GdnbXiy_p29hjZnZ2dnUVZ8qqdnZ2d@pipex.net> <-JqdnTLcL5XQWBjZRVnyjQ@bt.com> <128bigq9gr415d4@corp.supernews.com> <44868E53.7030408@killspam.internode.on.net> <128ih6tr5d8np4c@corp.supernews.com> <448A785A.2070505@killspam.internode.on.net> Alan Peake wrote: > > Good method. I have done that before but my current RF sig gen doesn't > have very good output level regulation, nor is the output adjustable - > it's only a one-transistor sig gen after all:) > They wouldn't let me take my H-P with me when I retired :(] Neither of those should be a problem. The absolute level isn't important, and the amount you have to adjust the frequency for a single measurement is small -- for inductors of reasonable Q, anyway -- so the level probably won't change much over that small range unless the level stability is extraordinarily bad. I've got a one-FET homebrew oscillator I made a long time ago with an extra transistor or two for a crude ALC that keeps it reasonably flat over the whole HF range. But you shouldn't need an ALC for most Q measurements. Roy Lewallen, W7EL Article: 97630 of rec.radio.amateur.homebrew From: "RST Engineering" Subject: Canada: Repeaters Up The Alcan (sorta OT) Message-ID: Date: Sat, 10 Jun 2006 18:59:57 -0700 Sorry for posting this OT, but those *&^&*(**& over on rec.radio. amateur.misc make it impossible to post a serious question on that group. Leaving Wednesday from Northern California for a trip up the Alcan to Anchorage. Anybody got a good series of repeaters going up the highway through Canada? Jim Article: 97631 of rec.radio.amateur.homebrew From: **THE-RFI-EMI-GUY** Subject: Re: Weller Tech Sheets References: Message-ID: Date: Sun, 11 Jun 2006 02:23:33 GMT This is a multi-part message in MIME format. --------------010708010402050905070501 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Do you have any tips on fixing a Weller EC-2002-A? It still regulates and heats, but the temperature display is dead. When first turned on it flashes "FFF" for a split second. I think maybe bad filter capacitor or something. Any thoughts on fixing? This is a nice unit I had just bought spare iron and tips for it. Tried another iron, and also measured proper resistance on the thermistor. g. beat <@ wrote: >One of the most frequent questions I receive is concerning the deterioration >of the white silicon or vinyl cords on the older Weller TCP series soldering >irons. > >Weller does sell part number TC217, which is a black replacement cord with 3 >pin plug already installed. >This is a good solution for the irons that have the Lightweight Nylon handle >with black heater insulator/plug-in (after 1977) and mate to the WTCPN and >later stations. > >However, this is an expensive solution for the earlier TCP irons that had a >phenolic handle/finger heat shield, such as the WTCPK (military set with >4-pin Jones plug) or W-TCP and WTCPL stations. > >For these units, you have to cut off the 3-pin plug (expensive part of the >assembly) from the replacement cord to wire the Jones plug or directly wire >to the TCP base unit. > >The phenolic handle irons used a metal ground strap that also serves as the >cord's clamp and strain relief. >Removal and replacement of the old cord from this metal ground strap is >difficult (and can be dangerous without proper tools) > >Some restorers have used silicon or fiberglass/silicon sleeving or silicon >tubing to build a new cord by removing the old vinyl or broken silicon >insulation. > >Another option is to use a replacement silicon cord from Rapid electronics >(UK), order code 85-0590 >which sells for 3.88 British pounds - considerably cheaper. This cable is >not appropriate for the lightweight nylon handle, since it is slightly >larger in outside diameter and uses the next high wire gauge 20 AWG .. >instead of the original 22 AWG used by Weller. > > Rapid order code 85-0590 Silicone, heat-resistant cable for soldering >irons. > > > a.. Especially recommended for use with mains powered irons. > b.. Ideal for educational applications. > c.. Survives contact with a heated soldering iron tip. > d.. Convert existing PVC cabled irons to safer silicone cable. > e.. Pre-stripped and tinned. > f.. Overall length 1.5 metres. > g.. Suitable for use with all irons using 3-cored flexible cable. > > g. beat > > >====== >"g. beat >" <@ wrote in message >news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com... > > >>I have been slowly scanning my collection of Weller Tech Sheets and posting >>these on BAMA. >> >>Some of these instruction, parts and repair sheets go back to Weller >>Electric in the mid 1960s -- >>and are no longer available from CooperTools / Weller. >>http://bama.edebris.com/manuals/weller/ >> >>w9gb >> >> > > > > -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P --------------010708010402050905070501 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Do you have any tips on fixing a Weller EC-2002-A? It still regulates and heats, but the temperature display is dead. When first turned on it flashes "FFF" for a split second. I think maybe bad filter capacitor or something. Any thoughts on fixing? This is a nice unit I had just bought spare iron and tips for it. Tried another iron, and also measured proper resistance on the thermistor.

g. beat <@ wrote: 
One of the most frequent questions I receive is concerning the deterioration
of the white silicon or vinyl cords on the older Weller TCP series soldering 
irons.

Weller does sell part number TC217, which is a black replacement cord with 3 
pin plug already installed.
This is a good solution for the irons that have the Lightweight Nylon handle 
with black heater insulator/plug-in (after 1977) and mate to the WTCPN and 
later stations.

However, this is an expensive solution for the earlier TCP irons that had a 
phenolic handle/finger heat shield, such as the WTCPK (military set with 
4-pin Jones plug) or W-TCP and WTCPL stations.

For these units, you have to cut off the 3-pin plug (expensive part of the 
assembly) from the replacement cord to wire the Jones plug or directly wire 
to the TCP base unit.

The phenolic handle irons used a metal ground strap that also serves as the 
cord's clamp and strain relief.
Removal and replacement of the old cord from this metal ground strap is 
difficult (and can be dangerous without proper tools)

Some restorers have used silicon or fiberglass/silicon sleeving or silicon 
tubing to build a new cord by removing the old vinyl or broken silicon 
insulation.

Another option is to use a replacement silicon cord from Rapid electronics 
(UK), order code 85-0590
which sells for 3.88 British pounds - considerably cheaper.  This cable is 
not appropriate for the lightweight nylon handle, since it is slightly 
larger in outside diameter and uses the next high wire gauge 20 AWG .. 
instead of the original 22 AWG used by Weller.

      Rapid order code 85-0590  Silicone, heat-resistant cable for soldering 
irons.


        a.. Especially recommended for use with mains powered irons.
        b.. Ideal for educational applications.
        c.. Survives contact with a heated soldering iron tip.
        d.. Convert existing PVC cabled irons to safer silicone cable.
        e.. Pre-stripped and tinned.
        f.. Overall length 1.5 metres.
        g.. Suitable for use with all irons using 3-cored flexible cable.

      g. beat


======
"g. beat >" <@<spam protected> wrote in message 
news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com...
  
I have been slowly scanning my collection of Weller Tech Sheets and posting 
these on BAMA.

Some of these instruction, parts and repair sheets go back to Weller 
Electric in the mid 1960s -- 
and are no longer available from CooperTools / Weller.
http://bama.edebris.com/manuals/weller/

w9gb
    


  

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P
--------------010708010402050905070501-- Article: 97632 of rec.radio.amateur.homebrew From: **THE-RFI-EMI-GUY** Subject: Re: FCC tutorial on looking up schematic/info using ID number References: <1149865881.746342.289440@h76g2000cwa.googlegroups.com> <1149885762.986782.203720@u72g2000cwu.googlegroups.com> Message-ID: Date: Sun, 11 Jun 2006 02:26:42 GMT This is a multi-part message in MIME format. --------------050903000206050107090902 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Make sure you are clicking the correct hyperlink. The FCC pages are weird. Also it could be that the manufacturer excercised secrecy in what is allowed to be shown. I also notced a number of products have been certified and later undergone major changes not reflected on the database as having a permissable change. n4aeq wrote: >Thanks John, i can get it to display a list of documents that are in >.pdf but i there is no >way to click or open the docs. They just show the list of docs, >pitcures & other, does this mean i need to do something else? Is a >login required before the link will be active? > >John wrote: > > >>"John" wrote in message >>news:rM-dnTtr1L2MKhTZnZ2dnUVZ_tmdnZ2d@comcast.com... >> >> >>>"n4aeq" wrote in message >>>news:1149865881.746342.289440@h76g2000cwa.googlegroups.com... >>> >>> >>>>Im trying to lookup schematics/info the FCCs website: >>>> >>>>https://gullfoss2.fcc.gov/prod/oet/cf/eas/reports/GenericSearch.cfm >>>> >>>>I have the website but havent had much luck looking anything up using >>>>fcc id #, sense this >>>>is my first attempt then maybe theirs something im doing wrong on the >>>>search page. Alot >>>>of people seem to use the site for schematics and other good >>>>information, seems like >>>>it would great for the ham/experimenter. Any help getting started at >>>>looking up information >>>>on the fcc website would be appreciated. >>>> >>>> >>>> >>>https://gullfoss2.fcc.gov/prod/oet/cf/eas/reports/GenericSearch.cfm >>> >>> >>> >>> >>I hit transmit too soon. >>Note that the FCC ID is entered in pieces, the first 3 characters in the >>first block, and all of the rest in the second block. That is all that you >>have to enter. Try PY3WG511-F as an example. There are lots of >>documents available. >> >> > > > -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P --------------050903000206050107090902 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Make sure you are clicking the correct hyperlink. The FCC pages are weird. Also it could be that the manufacturer excercised secrecy in what is allowed to be shown. I also notced a  number of products have been certified and later undergone major changes not reflected on the database as having a permissable change.

n4aeq wrote:
Thanks John, i can get it to display a list of documents that are in
.pdf but i there is no
way to click or open the docs.  They just show the list of docs,
pitcures & other, does this mean i need to do something else? Is a
login required before the link will be active?

John wrote:
  
"John" <noaddress@noaddress.invalid> wrote in message
news:rM-dnTtr1L2MKhTZnZ2dnUVZ_tmdnZ2d@comcast.com...
    
"n4aeq" <tucker@conninc.com> wrote in message
news:1149865881.746342.289440@h76g2000cwa.googlegroups.com...
      
Im trying to lookup schematics/info the FCCs website:

https://gullfoss2.fcc.gov/prod/oet/cf/eas/reports/GenericSearch.cfm

I have the website but havent had much luck looking anything up using
fcc id #, sense this
is my first attempt then maybe theirs something im doing wrong on the
search page.  Alot
of people seem to use the site for schematics and other good
information,  seems like
it would great for the ham/experimenter.  Any help getting started at
looking up information
on the fcc website would be appreciated.

        
https://gullfoss2.fcc.gov/prod/oet/cf/eas/reports/GenericSearch.cfm


      
I hit transmit too soon.
Note that the FCC ID is entered in pieces, the first 3 characters in the
first block, and all of the rest in the second block.  That is all that you
have to enter.  Try PY3WG511-F as an example.  There are lots of
documents available.
    

  

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P
--------------050903000206050107090902-- Article: 97633 of rec.radio.amateur.homebrew From: **THE-RFI-EMI-GUY** Subject: Re: Weller Tech Sheets References: Message-ID: Date: Sun, 11 Jun 2006 03:35:55 GMT This is a multi-part message in MIME format. --------------030508010505030800020405 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Thanks for the tips. The controller died while using the original iron. I will make sure the new one is compatible. Thanks again g. beat <@ wrote: > BE VERY CAREFUL ON USING REPLACEMENT IRONS (EC-1201 series) ON THE > EARLY "EC" SERIES MODEL BASE UNITS > > WELLER CHANGED THE PIN OUTS OF THE 5-pin CONNECTOR FOR THE IRON AND > BASES WITH THE EC SERIES !! > THEY ARE DIFFERENT (EC-1201 is different from EC-1201-A and EC1201 P > ... etc.) !!! > > THIS CAN DAMAGE CONTROL BOARDS OR IRONS !! > > Greg > > "**THE-RFI-EMI-GUY**" > wrote in message > news:F8Lig.10221$Ui7.8851@tornado.tampabay.rr.com... > Do you have any tips on fixing a Weller EC-2002-A? It still > regulates and heats, but the temperature display is dead. When > first turned on it flashes "FFF" for a split second. I think maybe > bad filter capacitor or something. Any thoughts on fixing? This is > a nice unit I had just bought spare iron and tips for it. Tried > another iron, and also measured proper resistance on the thermistor. > > g. beat <@ wrote: > >>One of the most frequent questions I receive is concerning the deterioration >>of the white silicon or vinyl cords on the older Weller TCP series soldering >>irons. >> >>Weller does sell part number TC217, which is a black replacement cord with 3 >>pin plug already installed. >>This is a good solution for the irons that have the Lightweight Nylon handle >>with black heater insulator/plug-in (after 1977) and mate to the WTCPN and >>later stations. >> >>However, this is an expensive solution for the earlier TCP irons that had a >>phenolic handle/finger heat shield, such as the WTCPK (military set with >>4-pin Jones plug) or W-TCP and WTCPL stations. >> >>For these units, you have to cut off the 3-pin plug (expensive part of the >>assembly) from the replacement cord to wire the Jones plug or directly wire >>to the TCP base unit. >> >>The phenolic handle irons used a metal ground strap that also serves as the >>cord's clamp and strain relief. >>Removal and replacement of the old cord from this metal ground strap is >>difficult (and can be dangerous without proper tools) >> >>Some restorers have used silicon or fiberglass/silicon sleeving or silicon >>tubing to build a new cord by removing the old vinyl or broken silicon >>insulation. >> >>Another option is to use a replacement silicon cord from Rapid electronics >>(UK), order code 85-0590 >>which sells for 3.88 British pounds - considerably cheaper. This cable is >>not appropriate for the lightweight nylon handle, since it is slightly >>larger in outside diameter and uses the next high wire gauge 20 AWG .. >>instead of the original 22 AWG used by Weller. >> >> Rapid order code 85-0590 Silicone, heat-resistant cable for soldering >>irons. >> >> >> a.. Especially recommended for use with mains powered irons. >> b.. Ideal for educational applications. >> c.. Survives contact with a heated soldering iron tip. >> d.. Convert existing PVC cabled irons to safer silicone cable. >> e.. Pre-stripped and tinned. >> f.. Overall length 1.5 metres. >> g.. Suitable for use with all irons using 3-cored flexible cable. >> >> g. beat >> >> >>====== >>"g. beat >" <@ wrote in message >>news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com... >> >> >>>I have been slowly scanning my collection of Weller Tech Sheets and posting >>>these on BAMA. >>> >>>Some of these instruction, parts and repair sheets go back to Weller >>>Electric in the mid 1960s -- >>>and are no longer available from CooperTools / Weller. >>>http://bama.edebris.com/manuals/weller/ >>> >>>w9gb >>> >>> >> >> >> >> > >-- >Joe Leikhim K4SAT >"The RFI-EMI-GUY"© > >"Treason doth never prosper: what's the reason? >For if it prosper, none dare call it treason." > >"Follow The Money" ;-P > > > -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P --------------030508010505030800020405 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Thanks for the tips. The controller died while using the original iron. I will make sure the new one is compatible. Thanks again

g. beat <@ wrote:
BE VERY CAREFUL ON USING REPLACEMENT IRONS (EC-1201 series) ON THE EARLY "EC" SERIES MODEL BASE UNITS
 
WELLER CHANGED THE PIN OUTS OF THE 5-pin CONNECTOR FOR THE IRON AND BASES WITH THE EC SERIES !!
THEY ARE DIFFERENT (EC-1201 is different from EC-1201-A and EC1201 P ... etc.) !!!   
 
THIS CAN DAMAGE CONTROL BOARDS OR IRONS !!
 
Greg 
Do you have any tips on fixing a Weller EC-2002-A? It still regulates and heats, but the temperature display is dead. When first turned on it flashes "FFF" for a split second. I think maybe bad filter capacitor or something. Any thoughts on fixing? This is a nice unit I had just bought spare iron and tips for it. Tried another iron, and also measured proper resistance on the thermistor.

g. beat <@ wrote: 
One of the most frequent questions I receive is concerning the deterioration
of the white silicon or vinyl cords on the older Weller TCP series soldering 
irons.

Weller does sell part number TC217, which is a black replacement cord with 3 
pin plug already installed.
This is a good solution for the irons that have the Lightweight Nylon handle 
with black heater insulator/plug-in (after 1977) and mate to the WTCPN and 
later stations.

However, this is an expensive solution for the earlier TCP irons that had a 
phenolic handle/finger heat shield, such as the WTCPK (military set with 
4-pin Jones plug) or W-TCP and WTCPL stations.

For these units, you have to cut off the 3-pin plug (expensive part of the 
assembly) from the replacement cord to wire the Jones plug or directly wire 
to the TCP base unit.

The phenolic handle irons used a metal ground strap that also serves as the 
cord's clamp and strain relief.
Removal and replacement of the old cord from this metal ground strap is 
difficult (and can be dangerous without proper tools)

Some restorers have used silicon or fiberglass/silicon sleeving or silicon 
tubing to build a new cord by removing the old vinyl or broken silicon 
insulation.

Another option is to use a replacement silicon cord from Rapid electronics 
(UK), order code 85-0590
which sells for 3.88 British pounds - considerably cheaper.  This cable is 
not appropriate for the lightweight nylon handle, since it is slightly 
larger in outside diameter and uses the next high wire gauge 20 AWG .. 
instead of the original 22 AWG used by Weller.

      Rapid order code 85-0590  Silicone, heat-resistant cable for soldering 
irons.


        a.. Especially recommended for use with mains powered irons.
        b.. Ideal for educational applications.
        c.. Survives contact with a heated soldering iron tip.
        d.. Convert existing PVC cabled irons to safer silicone cable.
        e.. Pre-stripped and tinned.
        f.. Overall length 1.5 metres.
        g.. Suitable for use with all irons using 3-cored flexible cable.

      g. beat


======
"g. beat >" <@<spam protected> wrote in message 
news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com...
  
I have been slowly scanning my collection of Weller Tech Sheets and posting 
these on BAMA.

Some of these instruction, parts and repair sheets go back to Weller 
Electric in the mid 1960s -- 
and are no longer available from CooperTools / Weller.
http://bama.edebris.com/manuals/weller/

w9gb
    


  

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P

    

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P
--------------030508010505030800020405-- Article: 97634 of rec.radio.amateur.homebrew Message-ID: <448B90A9.5020605@nettally.com> From: **THE-RFI-EMI-GUY** Subject: Re: Weller Tech Sheets References: Date: Sun, 11 Jun 2006 03:35:44 GMT This is a multi-part message in MIME format. --------------030805070401060702030604 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Thanks for the tips. The controller died while using the original iron. I will make sure the new one is compatible. Thanks again g. beat <@ wrote: > BE VERY CAREFUL ON USING REPLACEMENT IRONS (EC-1201 series) ON THE > EARLY "EC" SERIES MODEL BASE UNITS > > WELLER CHANGED THE PIN OUTS OF THE 5-pin CONNECTOR FOR THE IRON AND > BASES WITH THE EC SERIES !! > THEY ARE DIFFERENT (EC-1201 is different from EC-1201-A and EC1201 P > ... etc.) !!! > > THIS CAN DAMAGE CONTROL BOARDS OR IRONS !! > > Greg > > "**THE-RFI-EMI-GUY**" > wrote in message > news:F8Lig.10221$Ui7.8851@tornado.tampabay.rr.com... > Do you have any tips on fixing a Weller EC-2002-A? It still > regulates and heats, but the temperature display is dead. When > first turned on it flashes "FFF" for a split second. I think maybe > bad filter capacitor or something. Any thoughts on fixing? This is > a nice unit I had just bought spare iron and tips for it. Tried > another iron, and also measured proper resistance on the thermistor. > > g. beat <@ wrote: > >>One of the most frequent questions I receive is concerning the deterioration >>of the white silicon or vinyl cords on the older Weller TCP series soldering >>irons. >> >>Weller does sell part number TC217, which is a black replacement cord with 3 >>pin plug already installed. >>This is a good solution for the irons that have the Lightweight Nylon handle >>with black heater insulator/plug-in (after 1977) and mate to the WTCPN and >>later stations. >> >>However, this is an expensive solution for the earlier TCP irons that had a >>phenolic handle/finger heat shield, such as the WTCPK (military set with >>4-pin Jones plug) or W-TCP and WTCPL stations. >> >>For these units, you have to cut off the 3-pin plug (expensive part of the >>assembly) from the replacement cord to wire the Jones plug or directly wire >>to the TCP base unit. >> >>The phenolic handle irons used a metal ground strap that also serves as the >>cord's clamp and strain relief. >>Removal and replacement of the old cord from this metal ground strap is >>difficult (and can be dangerous without proper tools) >> >>Some restorers have used silicon or fiberglass/silicon sleeving or silicon >>tubing to build a new cord by removing the old vinyl or broken silicon >>insulation. >> >>Another option is to use a replacement silicon cord from Rapid electronics >>(UK), order code 85-0590 >>which sells for 3.88 British pounds - considerably cheaper. This cable is >>not appropriate for the lightweight nylon handle, since it is slightly >>larger in outside diameter and uses the next high wire gauge 20 AWG .. >>instead of the original 22 AWG used by Weller. >> >> Rapid order code 85-0590 Silicone, heat-resistant cable for soldering >>irons. >> >> >> a.. Especially recommended for use with mains powered irons. >> b.. Ideal for educational applications. >> c.. Survives contact with a heated soldering iron tip. >> d.. Convert existing PVC cabled irons to safer silicone cable. >> e.. Pre-stripped and tinned. >> f.. Overall length 1.5 metres. >> g.. Suitable for use with all irons using 3-cored flexible cable. >> >> g. beat >> >> >>====== >>"g. beat >" <@ wrote in message >>news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com... >> >> >>>I have been slowly scanning my collection of Weller Tech Sheets and posting >>>these on BAMA. >>> >>>Some of these instruction, parts and repair sheets go back to Weller >>>Electric in the mid 1960s -- >>>and are no longer available from CooperTools / Weller. >>>http://bama.edebris.com/manuals/weller/ >>> >>>w9gb >>> >>> >> >> >> >> > >-- >Joe Leikhim K4SAT >"The RFI-EMI-GUY"© > >"Treason doth never prosper: what's the reason? >For if it prosper, none dare call it treason." > >"Follow The Money" ;-P > > > -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P --------------030805070401060702030604 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Thanks for the tips. The controller died while using the original iron. I will make sure the new one is compatible. Thanks again

g. beat <@ wrote:
BE VERY CAREFUL ON USING REPLACEMENT IRONS (EC-1201 series) ON THE EARLY "EC" SERIES MODEL BASE UNITS
 
WELLER CHANGED THE PIN OUTS OF THE 5-pin CONNECTOR FOR THE IRON AND BASES WITH THE EC SERIES !!
THEY ARE DIFFERENT (EC-1201 is different from EC-1201-A and EC1201 P ... etc.) !!!   
 
THIS CAN DAMAGE CONTROL BOARDS OR IRONS !!
 
Greg 
Do you have any tips on fixing a Weller EC-2002-A? It still regulates and heats, but the temperature display is dead. When first turned on it flashes "FFF" for a split second. I think maybe bad filter capacitor or something. Any thoughts on fixing? This is a nice unit I had just bought spare iron and tips for it. Tried another iron, and also measured proper resistance on the thermistor.

g. beat <@ wrote: 
One of the most frequent questions I receive is concerning the deterioration
of the white silicon or vinyl cords on the older Weller TCP series soldering 
irons.

Weller does sell part number TC217, which is a black replacement cord with 3 
pin plug already installed.
This is a good solution for the irons that have the Lightweight Nylon handle 
with black heater insulator/plug-in (after 1977) and mate to the WTCPN and 
later stations.

However, this is an expensive solution for the earlier TCP irons that had a 
phenolic handle/finger heat shield, such as the WTCPK (military set with 
4-pin Jones plug) or W-TCP and WTCPL stations.

For these units, you have to cut off the 3-pin plug (expensive part of the 
assembly) from the replacement cord to wire the Jones plug or directly wire 
to the TCP base unit.

The phenolic handle irons used a metal ground strap that also serves as the 
cord's clamp and strain relief.
Removal and replacement of the old cord from this metal ground strap is 
difficult (and can be dangerous without proper tools)

Some restorers have used silicon or fiberglass/silicon sleeving or silicon 
tubing to build a new cord by removing the old vinyl or broken silicon 
insulation.

Another option is to use a replacement silicon cord from Rapid electronics 
(UK), order code 85-0590
which sells for 3.88 British pounds - considerably cheaper.  This cable is 
not appropriate for the lightweight nylon handle, since it is slightly 
larger in outside diameter and uses the next high wire gauge 20 AWG .. 
instead of the original 22 AWG used by Weller.

      Rapid order code 85-0590  Silicone, heat-resistant cable for soldering 
irons.


        a.. Especially recommended for use with mains powered irons.
        b.. Ideal for educational applications.
        c.. Survives contact with a heated soldering iron tip.
        d.. Convert existing PVC cabled irons to safer silicone cable.
        e.. Pre-stripped and tinned.
        f.. Overall length 1.5 metres.
        g.. Suitable for use with all irons using 3-cored flexible cable.

      g. beat


======
"g. beat >" <@<spam protected> wrote in message 
news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com...
  
I have been slowly scanning my collection of Weller Tech Sheets and posting 
these on BAMA.

Some of these instruction, parts and repair sheets go back to Weller 
Electric in the mid 1960s -- 
and are no longer available from CooperTools / Weller.
http://bama.edebris.com/manuals/weller/

w9gb
    


  

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P

    

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P
--------------030805070401060702030604-- Article: 97635 of rec.radio.amateur.homebrew From: David Subject: Re: 44.545MHz LO References: Message-ID: Date: Sun, 11 Jun 2006 09:39:25 GMT John, Are you using them in a series resonant circuit or parallel ? Have you tried an inductor in series with the crystal (say 500nH to 800nH) ? Regards David John Wilkinson wrote: > Hi, > I need a good second LO at 44.545MHz. > I have a few crystals that I bought, that are say they are 44.545MHz, but > are really 44.548MHz. I tried pulling the frquency somewhat, but to no > great avail. > I have read that overtone crystals are hard to pull. > > Does anyone know where I can get good quality crystals at this frequency? > > Or how I may combine some easily available crystal frequencies to get > either 44.545MHz or 45.455MHz? > > Best regards, > John. Article: 97636 of rec.radio.amateur.homebrew From: Paul Keinanen Subject: Re: 44.545MHz LO Message-ID: References: Date: Sun, 11 Jun 2006 13:16:54 +0300 On Mon, 12 Jun 2006 08:23:33 +0100, John Wilkinson wrote: >I have a few crystals that I bought, that are say they are 44.545MHz, but >are really 44.548MHz. I tried pulling the frquency somewhat, but to no >great avail. Overtone crystals do not oscillate at the _accurate_ integer multiple of the fundamental frequency due to end effects. Have you tried to run the crystal in the fundamental mode ? If the produced frequency is close enough to 14.84833.. MHz, just put a separate tripler after the oscillator. >I have read that overtone crystals are hard to pull. The pulling range is proportional to 1/NČ and since the needed pulling range would be 67 ppm and assuming 3rd overtone crystals, the comparable pulling range for fundamental mode crystals would be 600 ppm, which indeed is quite a lot. Paul OH3LWR Article: 97637 of rec.radio.amateur.homebrew From: "W3JDR" References: Subject: Re: 44.545MHz LO Message-ID: <7xSig.2129$X02.440@trnddc02> Date: Sun, 11 Jun 2006 10:47:31 GMT John, Most overtone crystals are designed for operation on their series resonance. There is also a parallel resonance, usually a few khz higher than the series resonance. The fact that your oscillator is putting out a signal a few khz higher than the frequency marked on the crystal is a good indicator that you might be operating the crystal in the parallel mode. You shouldn't have to resort to any 'tricks' like operating it in its fundamental mode & multiplying, or putting frequency 'pulling' components in the circuit. It should come very close to the marked frequency if you use the correct circuit. Can you refer to a circuit that's similar to yours so we can look at it and recommend what might be wrong? Joe W3JDR "John Wilkinson" wrote in message news:f645hxvffzbd$.1vs281zx2v9r1$.dlg@40tude.net... > Hi, > I need a good second LO at 44.545MHz. > I have a few crystals that I bought, that are say they are 44.545MHz, but > are really 44.548MHz. I tried pulling the frquency somewhat, but to no > great avail. > I have read that overtone crystals are hard to pull. > > Does anyone know where I can get good quality crystals at this frequency? > > Or how I may combine some easily available crystal frequencies to get > either 44.545MHz or 45.455MHz? > > Best regards, > John. Article: 97638 of rec.radio.amateur.homebrew From: David Subject: Schematic for Low Capacitance Fet Buffer Message-ID: Date: Sun, 11 Jun 2006 11:45:53 GMT Hi, I am looking for a circuit for a low capacitance FET circuit to act as a Buffer/Amp for VHF signals (ie. to probe Oscillators etc). (Homebrew Active Probe). I have searched quite a bit on www but cannot locate a suitable design. Thanks in advance Regards David Article: 97639 of rec.radio.amateur.homebrew From: "mocio_Vileda" Subject: schematicxdiode-capacitance Date: Sun, 11 Jun 2006 14:04:04 +0200 Message-ID: <448c06d0$0$972$5fc30a8@news.tiscali.it> I need a capacitance meter scheme to test just varicap and several diodes , has anyone link(s)? Article: 97640 of rec.radio.amateur.homebrew From: Larry Gagnon Subject: Re: Canada: Repeaters Up The Alcan (sorta OT) Date: Sun, 11 Jun 2006 09:12:04 -0700 Message-ID: References: On Sat, 10 Jun 2006 18:59:57 -0700, RST Engineering wrote: > Leaving Wednesday from Northern California for a trip up the Alcan to > Anchorage. Anybody got a good series of repeaters going up the highway > through Canada? Being as the Alaska HighWay runs through Alberta, British Columbia, the Yukon and Alaska it is a simple matter to search google for repeaters in those areas. Try these to start: http://www.rac.ca/opsinfo/repeater.htm#Repeater%20Listings%20for%20locations%20in%20Canada http://www.bcarcc.org/ Larry VE7EA Article: 97641 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Schematic for Low Capacitance Fet Buffer Date: Sun, 11 Jun 2006 18:23:56 -0000 Message-ID: <128ontsrct6et9d@corp.supernews.com> References: >I am looking for a circuit for a low capacitance FET circuit to act as a >Buffer/Amp for VHF signals (ie. to probe Oscillators etc). (Homebrew >Active Probe). > >I have searched quite a bit on www but cannot locate a suitable design. One starting point might be a homebrew active-FET oscilloscope probe design shown by Robert Pease in "Troubleshooting Analog Circuits" (page 16). As shown, it has a bandwidth of 90 MHz, slew rate of 300 V/usec, input Z of 10^11 ohms in parallel with 0.29 pF. Construction is "ugly" style, with components soldered together in midair to minimize parasitic capacitance to ground. It uses a cascoded pair of 2N5486 or 2N5485 JFETs, driving a 2N3904/2N3906 buffer, and takes +/-15 VDC supply voltage. I suspect that its bandwidth might be improved by using faster bipolar-buffer transistors (maybe MPSH-something-or-other) and possibly J310 or U310 JFETs for the front end. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Article: 97642 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: schematicxdiode-capacitance Date: Sun, 11 Jun 2006 18:31:14 -0000 Message-ID: <128oobi3pe6n72b@corp.supernews.com> References: <448c06d0$0$972$5fc30a8@news.tiscali.it> In article <448c06d0$0$972$5fc30a8@news.tiscali.it>, mocio_Vileda wrote: >I need a capacitance meter scheme to test just varicap and several diodes >, >has anyone link(s)? Check out the AADE meter (www.aade.com) - it's the least expensive decently-accurate meter system I know of. I understand it's a kitted version of a project described in an electronics or radio magazine a few years ago (I don't know where the article appeared). A complete schematic is in the manual, which can be downloaded from AADE's site. The kit is (in my opinion) extremely well thought out; the meter I built went together in about an hour, worked first time, and behaves just as AADE says it should. *Very* nicely done. The little-or-no-extra-equipment approach would be to wire up your varicap arrangement in an oscillator circuit, resonating against a well-known inductance, and measured with a frequency counter or oscilloscope. Getting good accuracy in the face of all of the unknown parasitic reactances of such a circuit is going to be a huge headache, though. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! Article: 97643 of rec.radio.amateur.homebrew From: "RST Engineering" References: Subject: Re: Canada: Repeaters Up The Alcan (sorta OT) Message-ID: Date: Sun, 11 Jun 2006 16:47:45 -0700 Thank you, sir, I appreciate the information, but I've got a list of repeaters from Vancouver up to Anchorage. I've also got a list of repeaters in Northern California, and I know for a fact that I could monitor 90% of them for days on end without hearing anybody. What I wanted most of all was a list of GOOD repeaters, ones with activity on them, between Vancouver and the border of Alaska. I'll worry about Anchorage when I get there. How about it; any recommendations for "good" repeaters? Jim "Larry Gagnon" wrote in message news:pan.2006.06.11.16.12.00.350031@fakeuniserve.com... > On Sat, 10 Jun 2006 18:59:57 -0700, RST Engineering wrote: > >> Leaving Wednesday from Northern California for a trip up the Alcan to >> Anchorage. Anybody got a good series of repeaters going up the highway >> through Canada? > > Being as the Alaska HighWay runs through Alberta, British Columbia, the > Yukon and Alaska it is a simple matter to search google for repeaters in > those areas. > > Try these to start: > > http://www.rac.ca/opsinfo/repeater.htm#Repeater%20Listings%20for%20locations%20in%20Canada > http://www.bcarcc.org/ > > > Larry VE7EA > Article: 97644 of rec.radio.amateur.homebrew From: David Subject: Re: Schematic for Low Capacitance Fet Buffer References: <128ontsrct6et9d@corp.supernews.com> Message-ID: Date: Mon, 12 Jun 2006 01:09:45 GMT Dave, Thanks for the tip. I don't want to purchase an entire book for one circuit though. I do have some BF998 Dual Gate Mosfets, maybe I can make up a circuit based on these. I need around 1pF input capacitance and 1 Meg Ohm, Frequency up to a couple of hundred MHz. Regards David Dave Platt wrote: >> I am looking for a circuit for a low capacitance FET circuit to act as a >> Buffer/Amp for VHF signals (ie. to probe Oscillators etc). (Homebrew >> Active Probe). >> >> I have searched quite a bit on www but cannot locate a suitable design. > > One starting point might be a homebrew active-FET oscilloscope probe > design shown by Robert Pease in "Troubleshooting Analog Circuits" > (page 16). > > As shown, it has a bandwidth of 90 MHz, slew rate of 300 V/usec, input > Z of 10^11 ohms in parallel with 0.29 pF. Construction is "ugly" > style, with components soldered together in midair to minimize > parasitic capacitance to ground. > > It uses a cascoded pair of 2N5486 or 2N5485 JFETs, driving a > 2N3904/2N3906 buffer, and takes +/-15 VDC supply voltage. > > I suspect that its bandwidth might be improved by using faster > bipolar-buffer transistors (maybe MPSH-something-or-other) and > possibly J310 or U310 JFETs for the front end. > Article: 97645 of rec.radio.amateur.homebrew From: **THE-RFI-EMI-GUY** Subject: Re: Weller Tech Sheets References: Message-ID: Date: Mon, 12 Jun 2006 01:35:47 GMT This is a multi-part message in MIME format. --------------080401010201080301080203 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit thanks! g. beat <@ wrote: > I have a sheet that shows the different pin-outs .. will get that on > BAMA -- when I have chance to scan. > > Greg > > "**THE-RFI-EMI-GUY**" > wrote in message > news:vcMig.10226$Ui7.5511@tornado.tampabay.rr.com... > Thanks for the tips. The controller died while using the original > iron. I will make sure the new one is compatible. Thanks again > > g. beat <@ wrote: > >> BE VERY CAREFUL ON USING REPLACEMENT IRONS (EC-1201 series) ON >> THE EARLY "EC" SERIES MODEL BASE UNITS >> >> WELLER CHANGED THE PIN OUTS OF THE 5-pin CONNECTOR FOR THE IRON >> AND BASES WITH THE EC SERIES !! >> THEY ARE DIFFERENT (EC-1201 is different from EC-1201-A and >> EC1201 P ... etc.) !!! >> >> THIS CAN DAMAGE CONTROL BOARDS OR IRONS !! >> >> Greg >> >> "**THE-RFI-EMI-GUY**" > > wrote in message >> news:F8Lig.10221$Ui7.8851@tornado.tampabay.rr.com... >> Do you have any tips on fixing a Weller EC-2002-A? It still >> regulates and heats, but the temperature display is dead. >> When first turned on it flashes "FFF" for a split second. I >> think maybe bad filter capacitor or something. Any thoughts >> on fixing? This is a nice unit I had just bought spare iron >> and tips for it. Tried another iron, and also measured proper >> resistance on the thermistor. >> >> g. beat <@ wrote: >> >>>One of the most frequent questions I receive is concerning the deterioration >>>of the white silicon or vinyl cords on the older Weller TCP series soldering >>>irons. >>> >>>Weller does sell part number TC217, which is a black replacement cord with 3 >>>pin plug already installed. >>>This is a good solution for the irons that have the Lightweight Nylon handle >>>with black heater insulator/plug-in (after 1977) and mate to the WTCPN and >>>later stations. >>> >>>However, this is an expensive solution for the earlier TCP irons that had a >>>phenolic handle/finger heat shield, such as the WTCPK (military set with >>>4-pin Jones plug) or W-TCP and WTCPL stations. >>> >>>For these units, you have to cut off the 3-pin plug (expensive part of the >>>assembly) from the replacement cord to wire the Jones plug or directly wire >>>to the TCP base unit. >>> >>>The phenolic handle irons used a metal ground strap that also serves as the >>>cord's clamp and strain relief. >>>Removal and replacement of the old cord from this metal ground strap is >>>difficult (and can be dangerous without proper tools) >>> >>>Some restorers have used silicon or fiberglass/silicon sleeving or silicon >>>tubing to build a new cord by removing the old vinyl or broken silicon >>>insulation. >>> >>>Another option is to use a replacement silicon cord from Rapid electronics >>>(UK), order code 85-0590 >>>which sells for 3.88 British pounds - considerably cheaper. This cable is >>>not appropriate for the lightweight nylon handle, since it is slightly >>>larger in outside diameter and uses the next high wire gauge 20 AWG .. >>>instead of the original 22 AWG used by Weller. >>> >>> Rapid order code 85-0590 Silicone, heat-resistant cable for soldering >>>irons. >>> >>> >>> a.. Especially recommended for use with mains powered irons. >>> b.. Ideal for educational applications. >>> c.. Survives contact with a heated soldering iron tip. >>> d.. Convert existing PVC cabled irons to safer silicone cable. >>> e.. Pre-stripped and tinned. >>> f.. Overall length 1.5 metres. >>> g.. Suitable for use with all irons using 3-cored flexible cable. >>> >>> g. beat >>> >>> >>>====== >>>"g. beat >" <@ wrote in message >>>news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com... >>> >>> >>>>I have been slowly scanning my collection of Weller Tech Sheets and posting >>>>these on BAMA. >>>> >>>>Some of these instruction, parts and repair sheets go back to Weller >>>>Electric in the mid 1960s -- >>>>and are no longer available from CooperTools / Weller. >>>>http://bama.edebris.com/manuals/weller/ >>>> >>>>w9gb >>>> >>>> >>> >>> >>> >>> >> >>-- >>Joe Leikhim K4SAT >>"The RFI-EMI-GUY"© >> >>"Treason doth never prosper: what's the reason? >>For if it prosper, none dare call it treason." >> >>"Follow The Money" ;-P >> >> >> > >-- >Joe Leikhim K4SAT >"The RFI-EMI-GUY"© > >"Treason doth never prosper: what's the reason? >For if it prosper, none dare call it treason." > >"Follow The Money" ;-P > > > -- Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Treason doth never prosper: what's the reason? For if it prosper, none dare call it treason." "Follow The Money" ;-P --------------080401010201080301080203 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit thanks!

g. beat <@ wrote:
I have a sheet that shows the different pin-outs .. will get that on BAMA -- when I have chance to scan.
 
Greg
Thanks for the tips. The controller died while using the original iron. I will make sure the new one is compatible. Thanks again

g. beat <@ wrote:
BE VERY CAREFUL ON USING REPLACEMENT IRONS (EC-1201 series) ON THE EARLY "EC" SERIES MODEL BASE UNITS
 
WELLER CHANGED THE PIN OUTS OF THE 5-pin CONNECTOR FOR THE IRON AND BASES WITH THE EC SERIES !!
THEY ARE DIFFERENT (EC-1201 is different from EC-1201-A and EC1201 P ... etc.) !!!   
 
THIS CAN DAMAGE CONTROL BOARDS OR IRONS !!
 
Greg 
Do you have any tips on fixing a Weller EC-2002-A? It still regulates and heats, but the temperature display is dead. When first turned on it flashes "FFF" for a split second. I think maybe bad filter capacitor or something. Any thoughts on fixing? This is a nice unit I had just bought spare iron and tips for it. Tried another iron, and also measured proper resistance on the thermistor.

g. beat <@ wrote: 
One of the most frequent questions I receive is concerning the deterioration
of the white silicon or vinyl cords on the older Weller TCP series soldering 
irons.

Weller does sell part number TC217, which is a black replacement cord with 3 
pin plug already installed.
This is a good solution for the irons that have the Lightweight Nylon handle 
with black heater insulator/plug-in (after 1977) and mate to the WTCPN and 
later stations.

However, this is an expensive solution for the earlier TCP irons that had a 
phenolic handle/finger heat shield, such as the WTCPK (military set with 
4-pin Jones plug) or W-TCP and WTCPL stations.

For these units, you have to cut off the 3-pin plug (expensive part of the 
assembly) from the replacement cord to wire the Jones plug or directly wire 
to the TCP base unit.

The phenolic handle irons used a metal ground strap that also serves as the 
cord's clamp and strain relief.
Removal and replacement of the old cord from this metal ground strap is 
difficult (and can be dangerous without proper tools)

Some restorers have used silicon or fiberglass/silicon sleeving or silicon 
tubing to build a new cord by removing the old vinyl or broken silicon 
insulation.

Another option is to use a replacement silicon cord from Rapid electronics 
(UK), order code 85-0590
which sells for 3.88 British pounds - considerably cheaper.  This cable is 
not appropriate for the lightweight nylon handle, since it is slightly 
larger in outside diameter and uses the next high wire gauge 20 AWG .. 
instead of the original 22 AWG used by Weller.

      Rapid order code 85-0590  Silicone, heat-resistant cable for soldering 
irons.


        a.. Especially recommended for use with mains powered irons.
        b.. Ideal for educational applications.
        c.. Survives contact with a heated soldering iron tip.
        d.. Convert existing PVC cabled irons to safer silicone cable.
        e.. Pre-stripped and tinned.
        f.. Overall length 1.5 metres.
        g.. Suitable for use with all irons using 3-cored flexible cable.

      g. beat


======
"g. beat >" <@<spam protected> wrote in message 
news:Z7GdneQKhZ6AfBfZnZ2dnUVZ_sKdnZ2d@comcast.com...
  
I have been slowly scanning my collection of Weller Tech Sheets and posting 
these on BAMA.

Some of these instruction, parts and repair sheets go back to Weller 
Electric in the mid 1960s -- 
and are no longer available from CooperTools / Weller.
http://bama.edebris.com/manuals/weller/

w9gb
    


  

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P

    

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P

    

-- 
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P
--------------080401010201080301080203-- Article: 97646 of rec.radio.amateur.homebrew From: Larry Gagnon Subject: Re: Canada: Repeaters Up The Alcan (sorta OT) Date: Sun, 11 Jun 2006 21:39:50 -0700 Message-ID: References: On Sun, 11 Jun 2006 16:47:45 -0700, RST Engineering wrote: > What I wanted most of all was > a list of GOOD repeaters, ones with activity on them, between Vancouver and > the border of Alaska. I'll worry about Anchorage when I get there. > > How about it; any recommendations for "good" repeaters? > > Jim Well Jim, this is way off topic for this newsgroup but I don't think on any 2M repeater, except those in very large cities, will you find too much activity. AFAIAK 2M repeaters are "ham radio telephones". Most of the time folks call only those they know and talk to only those they know. A bit of a "club" thing really. I have never found 2M to be much good on the road except for the odd occasion - much prefer mobile HF CW and have had MUCH better luck getting QSO's going doing that than I ever did while travelling with my VHF rig alone. For what it's worth - just my opinion. Also, as you know the population density in Canada, especially northern Canada is significantly less than in the USA so there will always be less activity than you may be used to. Cheers....Larry VE7EA Article: 97647 of rec.radio.amateur.homebrew From: "W3JDR" References: <7xSig.2129$X02.440@trnddc02> <1qnq3zucb2g9h$.sz8r3sm5zo8$.dlg@40tude.net> Subject: Re: 44.545MHz LO Message-ID: Date: Mon, 12 Jun 2006 10:15:37 GMT John, It's hard to tell exactly what you have from a verbal description, but I have a suggestion for a test you can make. Basically, the crystal will look like a small resistance of about 50 ohms or so at its series resonant frequency. Replace the crystal with a 50 ohm resistor (of course, do what you have to do to preserve the DC bias) and see if the circuit oscillates and can be tuned through the crystal frequency. If it doesn't oscillate, chances are that your circuit won't work with a series mode crystal. Also in general, if you are using a tapped-capacitor colpitts circuit, you can remove the connnection from the junction of the two capacitors to whereever it was connected, and replace that connection with the resistor. If that works, it should oscillate when you replace the resistor with the crystal. Joe W3JDR "John Wilkinson" wrote in message news:1qnq3zucb2g9h$.sz8r3sm5zo8$.dlg@40tude.net... > On Sun, 11 Jun 2006 10:47:31 GMT, W3JDR wrote: > >> John, >> >> Most overtone crystals are designed for operation on their series >> resonance. >> There is also a parallel resonance, usually a few khz higher than the >> series >> resonance. The fact that your oscillator is putting out a signal a few >> khz >> higher than the frequency marked on the crystal is a good indicator that >> you >> might be operating the crystal in the parallel mode. >> >> You shouldn't have to resort to any 'tricks' like operating it in its >> fundamental mode & multiplying, or putting frequency 'pulling' components >> in >> the circuit. It should come very close to the marked frequency if you use >> the correct circuit. >> >> >> Can you refer to a circuit that's similar to yours so we can look at it >> and >> recommend what might be wrong? >> >> Joe >> W3JDR >> >> >> "John Wilkinson" wrote in message >> news:f645hxvffzbd$.1vs281zx2v9r1$.dlg@40tude.net... >>> Hi, >>> I need a good second LO at 44.545MHz. >>> I have a few crystals that I bought, that are say they are 44.545MHz, >>> but >>> are really 44.548MHz. I tried pulling the frquency somewhat, but to no >>> great avail. >>> I have read that overtone crystals are hard to pull. >>> >>> Does anyone know where I can get good quality crystals at this >>> frequency? >>> >>> Or how I may combine some easily available crystal frequencies to get >>> either 44.545MHz or 45.455MHz? >>> >>> Best regards, >>> John. > > Hi, > Thanks, > The circuit I am using is a simple JFET J310 with a tuned drain circuit. > The XTAL is connected from the gate to the drain via a 10nF cap. > > Another was a colpits oscillator, with a 2N3904 transistor. The XTAL was > used in palce of the usual L and C. > > > Regards, > John. Article: 97648 of rec.radio.amateur.homebrew From: John Wilkinson Subject: Re: 44.545MHz LO References: <7xSig.2129$X02.440@trnddc02> Date: Mon, 12 Jun 2006 20:32:34 +0100 Message-ID: <1qnq3zucb2g9h$.sz8r3sm5zo8$.dlg@40tude.net> On Sun, 11 Jun 2006 10:47:31 GMT, W3JDR wrote: > John, > > Most overtone crystals are designed for operation on their series resonance. > There is also a parallel resonance, usually a few khz higher than the series > resonance. The fact that your oscillator is putting out a signal a few khz > higher than the frequency marked on the crystal is a good indicator that you > might be operating the crystal in the parallel mode. > > You shouldn't have to resort to any 'tricks' like operating it in its > fundamental mode & multiplying, or putting frequency 'pulling' components in > the circuit. It should come very close to the marked frequency if you use > the correct circuit. > > > Can you refer to a circuit that's similar to yours so we can look at it and > recommend what might be wrong? > > Joe > W3JDR > > > "John Wilkinson" wrote in message > news:f645hxvffzbd$.1vs281zx2v9r1$.dlg@40tude.net... >> Hi, >> I need a good second LO at 44.545MHz. >> I have a few crystals that I bought, that are say they are 44.545MHz, but >> are really 44.548MHz. I tried pulling the frquency somewhat, but to no >> great avail. >> I have read that overtone crystals are hard to pull. >> >> Does anyone know where I can get good quality crystals at this frequency? >> >> Or how I may combine some easily available crystal frequencies to get >> either 44.545MHz or 45.455MHz? >> >> Best regards, >> John. Hi, Thanks, The circuit I am using is a simple JFET J310 with a tuned drain circuit. The XTAL is connected from the gate to the drain via a 10nF cap. Another was a colpits oscillator, with a 2N3904 transistor. The XTAL was used in palce of the usual L and C. Regards, John. Article: 97649 of rec.radio.amateur.homebrew From: "Caveat Lector" References: <14WdnfhzxthMoxDZRVnyuQ@pipex.net> Subject: Re: Canada: Repeaters Up The Alcan (sorta OT) Message-ID: Date: Mon, 12 Jun 2006 09:18:50 -0700 >>What I wanted most of all was >> a list of GOOD repeaters, ones with activity on them, between Vancouver >> and the border of Alaska. I'll worry about Anchorage when I get there. >> >> How about it; any recommendations for "good" repeaters? What I have found for the "farmland" repeaters is they are not amenable to entertaining travelers. Emergencies - yes. Recommend a restaurant - sometimes. Want to talk about crop disease and prices -- they will talk for hours. Hint - put a YL on the mic -- that will draw out some responses (;-) -- CL -- I doubt, therefore I might be ! Article: 97650 of rec.radio.amateur.homebrew From: Skipp says hello Subject: Re: 8875 Date: Mon, 12 Jun 2006 18:59:55 +0000 (UTC) Message-ID: References: Hi Mitchell, The 8875 is its own beast... but you can find them surplus from guy who mod their original Dentron Amplifiers out. I have a 2500 that I'll some day rebuild with a different tube so who knows... I may even sell my used tubes on ebay. You can also post a want over on the yahoo rfamplifiers group, which is a pretty large group about both rf and audio amplifiers... http://groups.yahoo.com/group/rfamplifiers/ and the group does both tube and solid state amplifiers... cheers, skipp : Mitchell wrote: : Are there any replacement tubes available that are pin compatible with the : 8875. I have the Dentron 2500. : Thanks, : Mitchell Article: 97651 of rec.radio.amateur.homebrew From: Roy Lewallen Subject: Re: Schematic for Low Capacitance Fet Buffer Date: Mon, 12 Jun 2006 13:11:11 -0700 Message-ID: <128rij2d49tbm98@corp.supernews.com> References: <128ontsrct6et9d@corp.supernews.com> <1150129300.948601.199300@f14g2000cwb.googlegroups.com> skavanagh72nospam@yahoo.ca wrote: > David wrote: > >> I need around 1pF input capacitance and 1 Meg Ohm, Frequency up to a >> couple of hundred MHz. > > These specs are probably rather optimistic, in my opinion. I would > probably consider something like a large resistor in series with the > input of a cascode amplifier (cascode chosen to reduce effective input > capacitance due to feedback). Or perhaps a resistive voltage divider, > rather than just a series resistor, in an attempt to get flat response > over frequency. But there really is no such thing as a 1 Meg resistor > at VHF. The stray capacitance across resistors limits the maximum > achievable impedance to perhaps tens of kilohms. The "totem pole" follower (a FET source follower with a matched FET as the source "resistor") was widely used by Tektronix. It provides flat, near unity gain over a very wide bandwidth, with high input resistance and low input capacitance. It would be very difficult to make a cascode amplifier with response that flat. The 1 meg ohm resistor is to establish the DC and low frequency impedance. The unavoidable shunt C from the FETs and other sources makes it immaterial at high frequencies. I agree that 1 pF is optimistic -- it would be very difficult to achieve. You would probably have to do some bootstrapping to reduce the C to that level, if you can do it at all, and bootstrapping becomes more difficult as frequency increases. > . . . Roy Lewallen, W7EL Article: 97652 of rec.radio.amateur.homebrew Subject: bricks From: Allan Butler Date: Mon, 12 Jun 2006 21:56:35 -0500 Message-ID: <1150166962_35@64triton.net> Hi there: I am looking for resources to obtain schematics, pc layouts and such for solid state RF amplifiers. I am interested in everything from 6 meters up to 432 MHz. I know there is someone that advertises in QST but the May issue of this year did not have them in the advertising section. I am looking for amps that work off of 13.8 volts and anywhere from 100 watts up to about 150 watts output. Any information that you might have would be greatly appreciated. ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----