Article: 93717 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: antialiasing filter for undersampling Date: Tue, 19 Jul 2005 10:41:52 -0700 Message-ID: <11dqenrd8vcck97@corp.supernews.com> References: <1121792084.340672.150270@g47g2000cwa.googlegroups.com> "Hernán Sánchez" wrote in message news:1121792084.340672.150270@g47g2000cwa.googlegroups.com... "The signal (at IF) is at 44MHz and the bandwidth is 1MHz. How can I design the antialiasing filter for undersampling with that information?" Slap a bandpass filter that's 1MHz wide at 44MHz around the signal input path. Sample at something better than 2MHz (depending on how ideal your bandpass filter is -- realistically you'll probably need to sample at 2.5MHz or better... and things are simpler if you could manage to sample at 4MHz so that 44MHz ends up translated directly to DC rather than some offset). Article: 93718 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Finishing Aluminum Date: Tue, 19 Jul 2005 18:07:31 -0000 Message-ID: <11dqgb35mbqnn9f@corp.supernews.com> References: <11dof81dvap8mcb@corp.supernews.com> >>>Am I correct in understanding that TSP, also called Sugar Soap.... >>Nope. TSP is Tri-sodium phosphate... > >So what is in Draino? The Draino brand drain-unclogger I have seen is a mixture of lye pellets, and granulated aluminum. When dumped into a drain and watered, the lye and aluminum react, generating hydrogen gas, quite a bit of heat, and often some steam. The heat helps break up the gunk clogging the drain. "Red Devil" brand drain-unclogger is just lye, without the aluminum. If I recall correctly it even comes with instructions for making lye soap, using lye and fat. -- 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: 93719 of rec.radio.amateur.homebrew From: "Joel Kolstad" Subject: Re: antialiasing filter for undersampling Date: Tue, 19 Jul 2005 11:19:10 -0700 Message-ID: <11dqgtpmtkiit9c@corp.supernews.com> References: <1121792084.340672.150270@g47g2000cwa.googlegroups.com> <11dqenrd8vcck97@corp.supernews.com> <1121795356.943014.296270@z14g2000cwz.googlegroups.com> "Hernán Sánchez" wrote in message news:1121795356.943014.296270@z14g2000cwz.googlegroups.com... "Thanks for your answer... so, the basic idea is to design a filter at the frequency of IF (44MHz in this case) with a bandwidth equal to the BW of the data (1Mhz in this case)... am I right ?" Yes, that's it! Article: 93720 of rec.radio.amateur.homebrew From: "Mario Bros" References: <5jlld1pi35n5hpsb5o6nqfkhq69uv48opq@4ax.com> <1121749815.727527.170530@o13g2000cwo.googlegroups.com> <1121792209.561835.27280@z14g2000cwz.googlegroups.com> Subject: Re: TCXO Clipped Sine Wave Message-ID: Date: Tue, 19 Jul 2005 19:13:39 GMT Hi Tom, my TCXO is GTXO-531 GOLLEDGE-UK product. The parameters: Clipped Sine Wave 1.0V p-p Test Load 10k//10pF Phase noise (@1.0Khz): -135dbc/Hz max To this point I have 2 possible ways: 1) TCXO+HelicalFilter480Mhz+BFR96 Buffer+HelicalFilter480Mhz 2) TCXO+Ampli-Multiplier x3(120 Mhz)+Ampli-Multiplier x4(480Mhz)+Helical Filter480Mhz Also here, perhaps it is the case to make some test. But, to the first impact, what you tasks? 73's de IK6GQC Rocco "K7ITM" ha scritto nel messaggio news:1121792209.561835.27280@z14g2000cwz.googlegroups.com... > Hi Rocco, > > I would use the multiplication. Within the loop bandwidth of the PLL, > the phase noise will be determined by the crystal oscillator used as a > reference PLUS the noise contributed by the PLL chip itself (the phase > comparator and loop filter/amplifier), and outside the loop bandwidth, > it will be determined by the VCO used in the PLL. The important > thing, whether you use a PLL or multiplication, is to start with a > reference which has low phase noise. In fact, your TCXO may have good > phase noise...I don't know...I only know that some I've tested have not > been as clean as I'd like. But I'm also setting pretty high standards > for what I'm doing. > > If I were in your shoes, I would build the multiplier system just as > you first described, and use the TCXO you have, and if it proves to be > too noisy (phase noise), then look for a better oscillator. If you can > make even a crude measurement of the oscillator's phase noise before > you start, that would be good, too, just to know where you are > starting. My comment in my earlier posting was just to make you aware > to look at phase noise, not to change the basic way you are going about > it. > > Cheers, > Tom > Article: 93721 of rec.radio.amateur.homebrew From: "Mario Bros" References: <5jlld1pi35n5hpsb5o6nqfkhq69uv48opq@4ax.com> <1121749815.727527.170530@o13g2000cwo.googlegroups.com> <1121792209.561835.27280@z14g2000cwz.googlegroups.com> <1121803004.681756.140670@g43g2000cwa.googlegroups.com> Subject: Re: TCXO Clipped Sine Wave Message-ID: Date: Tue, 19 Jul 2005 20:05:41 GMT Ok Tom, just the second solution wants more job but creed also I that I am the better . Thanks still for the good suggestions. 73's de IK6GQC Rocco "K7ITM" ha scritto nel messaggio news:1121803004.681756.140670@g43g2000cwa.googlegroups.com... > Hi Rocco, > > The specified phase noise seems respectable to me. The ones I've been > looking at have some very nice characteristics that I need, but phase > noise about -115dBc/Hz at 1kHz offset. > > Though it might look like more work, I would use (2). If I used (1), > I would have a buffer amplifier from the oscillator, driving something > to generate rich harmonics...since you need an even harmonic, use an > assymetrical harmonic generator. Square waves, for example, have > extremely low even-order harmonics ("theoretically" zero). But with > (2), you can use a square wave to get the 3rd harmonic, and not have to > filter much 2nd or 4th, since there is little of either of those in > your square wave. A relatively simple filter at 120MHz will suffice. > Then the 480MHz helical must attenuate only signals 120MHz away, not > signals 40MHz away like in (1). > > At least, that is my take on it. There are tradeoffs, always, and > therefore you will see different designs to accomplish the same thing, > and all will work. > > Cheers, > Tom > Article: 93722 of rec.radio.amateur.homebrew Date: Tue, 19 Jul 2005 17:57:00 -0400 From: -ex- Subject: Re: Simple questions on receivers References: <1121199166.494373.59190@g49g2000cwa.googlegroups.com> <1121402521.763416.59680@z14g2000cwz.googlegroups.com> <3ab17$42d74ce4$4232bd6a$15556@COQUI.NET> <1121640125.959490.41200@g47g2000cwa.googlegroups.com> <50c4f$42daf364$4232bd1b$8913@COQUI.NET> <1121799542.755969.248720@o13g2000cwo.googlegroups.com> Message-ID: Comments interspersed, and staying with the BCB range scenario... dave.harper wrote: > -ex- wrote: > > >>In practice the coil Q is determined primarily by the form dielectric, >>wire size, wire spacing, diameter/length ratio/neary coupling effects, >>etc. R is far enough down the list that its generally not even >>considered. > > > Ah, so the voltage drop across the coil (due to the small internal > resistance) and the close proximity of the wires give it some > capacitance? Does this affect performance or just screw add unwanted > capacitance? The internal capacitance of the turns isn't enough to radically change the basic LC resonance. Instead it tends to result more like dielectric leakage > > Wouldn't adding space between wires cause some eddy currents and lower > the L of the coil? Again, not significantly in the BCB example. Take for instance, a 4" diameter coil wound with #18 wire, however many turns it takes. Lets say 60. Winding the coil close-spaced as opposed to about one-wire-diameter spacing will require a few less turns (maybe 10%) to get the same L. But the close spacing WILL result in lower Q once you re-establish the same inductance. There can be more than one reason for this...is it the winding spacing or the length/diameter ratio or more dielectric loss that causes this? (Its certainly not the R). Its impossible to say because you can't have one without the other! Smaller coils, say toilet-paper tube size, don't exhibit this effect - or at least not to the same degree. But there's a whole different geometry there and its not optimum. Nobody really knows exactly what goes on here other than trial-and-error experiments to see how they behave. > > Does wire coating make a difference regarding the dielectric? Or is it > another capacitance-altering effect? Yes it does. One of the tests on a good high Q coil is to set it up on a Q-meter then touch a piece of your coil-form material (or wire-insulation) to the coil and see how it behaves on the Q-meter. It shouldn't move. Lossy core material/insulation will cause a visible effect with this test. I'll reiterate in case someone jumps in and reads this without reading the earlier parts of the thread...you won't see this happen with a low-q coil but as you get higher in Q it becomes more and more evident. In fact, with a big solenoid coil and Q>500 you pretty much have to tie the sample material onto the end of a stick to do this test because of hand effects. Not to be confused with resonance detuning effects. There's no good rule of thumb for insulated wire other than a test like this. There's quite a bit of insulation material in 660-strand litz and thats darn good wire. No way to make a comparison because BARE litz can't exist! I don't think I've ever heard a comparison made between say bare 16-18 wire vs enamelled. I tend to think any difference would approach the 'too difficult to evaluate' range. -Bill Article: 93723 of rec.radio.amateur.homebrew From: "RadioGuy" References: <%LaCe.3098$5N3.2973@bgtnsc05-news.ops.worldnet.att.net> <5dokd1hq1vqimmh0vm8qntl6bq1dgvoptl@4ax.com> <92d74$42da6856$4232bd57$23078@COQUI.NET> Subject: Re: Finishing Aluminum Message-ID: <_KeDe.449146$cg1.391010@bgtnsc04-news.ops.worldnet.att.net> Date: Tue, 19 Jul 2005 22:01:30 GMT -ex- wrote in message news:92d74$42da6856$4232bd57$23078@COQUI.NET... > Wes Stewart wrote: > > On Sat, 16 Jul 2005 16:40:27 GMT, "RadioGuy" > > > > >>On simple projects I print or photocopy text then affix them onto to the > >>aluminum surface (after a first coat of acrylic on the aluminum) with white > >>glue then with multiple sprays of acrylic affix them permanently to the > >>surface. It worked real nice with a bandpass filter project---I secured the > >>graph of the filter characteristics onto the minibox for reference. > > > > > > Nice idea. I use the ruboff lettering (Datak) but of course they > > don't have any BPF response curves, [g] > > > > > On a bare metal panel the homebrew inkjet waterslide decals work quite > well and you could do your response curve with that method. > > -Bill It took me awhile to figure out what waterslide decals were---then I remembered! The last time I used them was many decades ago on model airplanes. What a great idea... the possiblities are endless. A Google search for 'waterslide decals' came up with many hits. http://www.inkjetdecalpaper.com/inkjet.html http://www.papilio.com/top%20pages/inkjet-water-slide-decal.htm Thanks RG Article: 93724 of rec.radio.amateur.homebrew From: "Roger Leone" References: <42dcd55d$1@news.iconz.co.nz> Subject: Re: Want to Build HF Amp using 3-500z Tube Message-ID: Date: Wed, 20 Jul 2005 01:47:02 GMT Kevin: This website should give you some useful ideas: http://ac6v.com/homebrew.htm#AMP Roger K6XQ Article: 93725 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA: 71A, 6146A, 5Y3/6087 TUBES Message-ID: Date: Wed, 20 Jul 2005 13:04:06 GMT See these tubes at : http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy other tubes and items coming as well. Check back often, tnx heytubeguy Article: 93726 of rec.radio.amateur.homebrew From: "Polymath" References: <6294-42D94D12-102@storefull-3255.bay.webtv.net> <42DA3D21.4080306@bloomer.net> <42da3e51$1_2@x-privat.org> <1121725307.731291@r2d2.vermontel.net> Subject: Re: build a variable capacitor Date: Wed, 20 Jul 2005 17:50:19 +0100 Message-ID: <42de8096_2@x-privat.org> Without following your link.....well done that man! "Jozef" wrote in message news:1121725307.731291@r2d2.vermontel.net... >I have recently built a very large pi-network transmatch with two very big >homemade variable capacitors. They can be seen at: >http://www.metaphoria.us/hamradio/transmatch.html > > "Polymath" wrote in message > news:42da3e51$1_2@x-privat.org... >> "Manufacture" = "Make By Hand" Article: 93727 of rec.radio.amateur.homebrew From: Tim Wescott Subject: Re: build a variable capacitor Date: Wed, 20 Jul 2005 11:14:52 -0700 Message-ID: <11dt54egdujan1c@corp.supernews.com> References: <6294-42D94D12-102@storefull-3255.bay.webtv.net> <1121882761.325048.274360@g44g2000cwa.googlegroups.com> K7ITM wrote: > The discussions in this thread make me wonder... it seems like the > tough part of making variable caps in the "classical" shape is making > the plates. In my distant past, I was involved in making modest > quantities of punched aluminum parts, and found a shop that was willing > to make a punch/die set for the parts, even though my initial order was > for only a couple hundred of them. (Eventually I ordered enough to > wear out the punch/die set and they made another one...probably did > 10,000 or so total.) Once you pay for the punch/die, the parts become > pretty cheap, and the uniformity is vastly superior to what you could > reasonably do by hand. So, the question becomes, if the plates (rotors > and stators) were available in maybe two or three different basic > sizes, how many frustrated hams would be interested in buying them? > Might it be enough to make the punch economical? Would you be willing > to pay, say, two dollars per plate for 0.0625" thick plates with 3" > rotor diameter? A set of 25 such plates, using 0.1" gap (good for > maybe 7kV peak?--provided the edges are properly rounded), would give > you about 190pF. Do the people who would be trying to build such > things already have the ability to do the rest of the parts, or would > they need to be included too? Does someone already sell kits of > capacitor parts? For short runs today laser cutting would be better -- the programming and setup costs are much lower than tooling. The quality will approach that of a good die set and exceed that of a poor one. There will be a point where things'll be cheaper to punch out with a die set, but it'd probably be in the thousands if not tens of thousands of plates. > > That's obviously way beyond what the OP needs for a receiving loop, of > course! For that, I'd probably use a varactor diode...or find a radio > receiver to scrap one out of if I wanted to stay mechanical. > > Cheers, > Tom > I wouldn't use a varactor to tune a recieving loop because of intermod. Antique Radio Supply and others have various variable caps for sale. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 93728 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: build a variable capacitor Date: Wed, 20 Jul 2005 20:41:16 -0000 Message-ID: <11dtdnc15mr3o30@corp.supernews.com> References: <6294-42D94D12-102@storefull-3255.bay.webtv.net> <1121882761.325048.274360@g44g2000cwa.googlegroups.com> <11dt54egdujan1c@corp.supernews.com> <1121890868.502275.229060@g47g2000cwa.googlegroups.com> In article <1121890868.502275.229060@g47g2000cwa.googlegroups.com>, K7ITM wrote: >Good point about other tooling methods (laser cutting not the only one >available), but the question remains, how many people would actually be >interested in buying plates, at what cost levels? (At the time I was >making the other parts, soft tooling was cheaper for very short runs, >but the shop that did the punch/die was set up to make such tools at >very low cost and easily beat the soft tooling for modest runs. You >just need to decide how many of your parts you want, and go shopping.) At the price you suggested (a couple of dollars per plate), the cost of putting together a good-sized air variable is going to be fairly fierce. It may be somewhat less than the cost of a new, commercially manufactured AVC, but it's probably not competitive with the cost of used-but-serviceable air variables at hamfest/fleamarket prices. You might find that it was appealing only to those who needed a fairly specific size/capacitance/standoff-voltage combination, not available used. You might find it attractive to specialize a bit. One not-uncommon application for large air variable caps these days, is people who want to make a magnetic-loop transmitting antenna. In this application, keeping resistive losses in the cap to a minimum is very desirable to help keep the Q and efficiency as not-terribly-low as possible. One way to do this is to use a welded rotor/shaft assembly, and welded stator plates, to reduce resistive losses. This is beyond the capabilities of most homebrewers, I think. An alternative is to use a soldered construction, which can't be done easily with aluminum but which is relatively easy if your shaft and spacers are brass, and the plates are either brass, or PC-board material (double-sided would work best). Hence, you might increase the demand for such stamped or laser-cut plates if you were able to offer them in materials other than aluminum. The materials cost for brass would probably be higher than for aluminum, but you might be able to offer plates in double-sided FR4 for prices no more than aluminum. -- 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: 93729 of rec.radio.amateur.homebrew From: Tim Wescott Subject: Re: build a variable capacitor Date: Wed, 20 Jul 2005 14:21:27 -0700 Message-ID: <11dtg28gev6c506@corp.supernews.com> References: <6294-42D94D12-102@storefull-3255.bay.webtv.net> <1121882761.325048.274360@g44g2000cwa.googlegroups.com> <11dt54egdujan1c@corp.supernews.com> <1121890868.502275.229060@g47g2000cwa.googlegroups.com> <11dtdnc15mr3o30@corp.supernews.com> Dave Platt wrote: > In article <1121890868.502275.229060@g47g2000cwa.googlegroups.com>, > K7ITM wrote: > > >>Good point about other tooling methods (laser cutting not the only one >>available), but the question remains, how many people would actually be >>interested in buying plates, at what cost levels? (At the time I was >>making the other parts, soft tooling was cheaper for very short runs, >>but the shop that did the punch/die was set up to make such tools at >>very low cost and easily beat the soft tooling for modest runs. You >>just need to decide how many of your parts you want, and go shopping.) > > > At the price you suggested (a couple of dollars per plate), the cost > of putting together a good-sized air variable is going to be fairly > fierce. It may be somewhat less than the cost of a new, commercially > manufactured AVC, but it's probably not competitive with the cost of > used-but-serviceable air variables at hamfest/fleamarket prices. You > might find that it was appealing only to those who needed a fairly > specific size/capacitance/standoff-voltage combination, not available > used. > > You might find it attractive to specialize a bit. One not-uncommon > application for large air variable caps these days, is people who want > to make a magnetic-loop transmitting antenna. In this application, > keeping resistive losses in the cap to a minimum is very desirable > to help keep the Q and efficiency as not-terribly-low as possible. > > One way to do this is to use a welded rotor/shaft assembly, and welded > stator plates, to reduce resistive losses. This is beyond the > capabilities of most homebrewers, I think. An alternative is to use a > soldered construction, which can't be done easily with aluminum but > which is relatively easy if your shaft and spacers are brass, and the > plates are either brass, or PC-board material (double-sided would work > best). > > Hence, you might increase the demand for such stamped or laser-cut > plates if you were able to offer them in materials other than > aluminum. The materials cost for brass would probably be higher than > for aluminum, but you might be able to offer plates in double-sided > FR4 for prices no more than aluminum. > At two bucks a pop for plates you _ought_ to be burning up most of your money in setup, tooling and handling, with very little going to the actual material. Hence brass shouldn't be too much more expensive. I might be more interested in a kit that would let me saw plates out of FR4 and assemble a precision cap -- so if you supplied frame & shaft pieces that would accept .031 or .062 FR4 that would be a cool thing. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Article: 93730 of rec.radio.amateur.homebrew From: Gary Morton Subject: Linear amplifier input mathcing circuit Message-ID: Date: Wed, 20 Jul 2005 22:45:48 GMT I bought a heatsink/PCB containing two RF transistors (2N6080, 2N6083) at a radio rally. I'm not sure what frequency it was for but it looks like a 2m or possibly a 70cm amplifier. It appears to be from the back end of some rig. It has antenna switching relay and decoupling and RF loads on the collectors. I intend to re-use it to make a 20W linear for 4m. I have stripped off all the matching parts between the stages (trimmers, Ls and surface mount type Cs). When I tested the transistors with a multimeter I was relieved to see that the BE and BC diodes gave a good reading which suggests that the transistors are intact. I have been reading a lot about linear amplifiers and matching circuits from the usual authors in RSGB and ARRL books. I am slowly getting an understanding of what is going on. I also have a Motorola databook which gives the datasheet for the two devices. The databook shows that the input is capacitive below 180MHz and down to 130MHz (3.18-j4.3). Extending the line on the smith chart it appears that the input gets more capacitive at 70MHz. My understanding was that a capacitive input would be counter-acted using a series inductor, however the original amplifier clearly had a capacitor from base to ground. In PW April 96 I stumbled across a 50MHz linear amplifier based on a 2N6080 and 2N6082 combo (TA6U2 from Spectrum Communications - which may still be available today). For both stages there is 1nF of capacitance from base to ground. In a third design for which I have the schematic a 2m amplifier using a 2N6080 as the first stage also has capacitance from base to ground. I'm puzzled. Anyway I constructed a T type input match using 200pF trimmers and a 3 turn coil rescued from the original circuit: C from i/p to common, C from common to gnd, L from common to transistor base. I read somewhere that this was called a "sloppy match". Using a MFJ259B as a signal generator I can adjust the trimmers to get a match at both 50MHz or 70MHz. Interestingly adjusting from the centre frequency the bandwidth of SWR less than 1.1 is greater at 50MHz than 70MHz. I'm guessing that this match circuit has multiple solutions for a fixed L depending upon Q, and that Q is lower at 50MHz. I understood that the L in my match would combine with the L of the transistor input impedance which would just result in a bigger overall L in the match circuit. Certainly this circuit appears to work. ->So why in three seperate designs do I see large capacitance between the base of the transistor and ground? Using the usual formula Zout=(Vcc*Vcc)/(2*Po)=(13*13)/(2*4)=21 I have added a 100nF and 22ohm resistor in series from the collector to ground to give what I hope is a sensible load (to test out the circuit). This will later be replaced with another match circuit, which I assume will need to match from 20ohm instead of 50ohm (as needed for the first stage). When experimenting without the proper match circuit do you even need a load, or is my idea sensible? regards... --Gary (M1GRY) Article: 93731 of rec.radio.amateur.homebrew Date: Wed, 20 Jul 2005 20:33:30 -0400 From: -ex- Subject: Re: Simple questions on receivers References: <1121199166.494373.59190@g49g2000cwa.googlegroups.com> <1121402521.763416.59680@z14g2000cwz.googlegroups.com> <3ab17$42d74ce4$4232bd6a$15556@COQUI.NET> <1121640125.959490.41200@g47g2000cwa.googlegroups.com> <50c4f$42daf364$4232bd1b$8913@COQUI.NET> <1121799542.755969.248720@o13g2000cwo.googlegroups.com> <1121889338.699737.244800@g43g2000cwa.googlegroups.com> Message-ID: <564e2$42deed69$4232bd15$32086@COQUI.NET> dave.harper wrote: > -ex- wrote: > > >>From what I've read here and elsewhere, I'm debating either making a > spider coil or a tight wound 4" cylinder ( about 1" length). Is there > any significant advantage to either? They're going to be very similar in performance. If you do the solenoid (cylinder), go with one wire spacing between turns instead of tight wound. Thats been pretty well proven to give a bit better Q. And 16-18 ga wire is also in the 'best' range for both the spider-web and solenoid. Next step up would be some serious litz wire. > > I can see with a powered ferrite core how the spacing would make less > of a difference... but if tight winding results in a lower Q/other > effects, why space the windings for air-core, crystal radio coils, > period? I'm not 100% sure I understand the question....On a rook/basketweave/spider coil there's inherent spacing already. And a solenoid coil will also do better that way...on larger coils. The way I understand it is that there are several factors at work - primarily interwinding capacitance and overall l/d ratio. In practice, as you change one you also change the other. You can compensate one for the other somewhat with a different diameter coil, different gauge wire, etc but the general concensus is that 4"/16-18 wire/~1 wire diameter spacing is pretty close to the best you can squeeze out of that class of coil. HTH. -Bill Article: 93732 of rec.radio.amateur.homebrew From: inagaddadavida@webtv.net (Jim) Subject: coupling loop for loop antenna Date: Wed, 20 Jul 2005 19:31:59 -0500 Message-ID: <3302-42DEECFF-96@storefull-3251.bay.webtv.net> i see two different designs on the net for receiving loops. one is to wind the pickup loop with the main loop, and another is to use a 1/5 size loop off center at the bottom. what are the pros and cons for each setup? what benefit is there to a pickup winding as opposed to just inductive coupling to the internal loopstick by proximity? Article: 93733 of rec.radio.amateur.homebrew Date: Wed, 20 Jul 2005 21:01:27 -0400 From: -ex- Subject: Re: Simple questions on receivers References: <1121199166.494373.59190@g49g2000cwa.googlegroups.com> <1121402521.763416.59680@z14g2000cwz.googlegroups.com> <3ab17$42d74ce4$4232bd6a$15556@COQUI.NET> <1121640125.959490.41200@g47g2000cwa.googlegroups.com> <50c4f$42daf364$4232bd1b$8913@COQUI.NET> <1121799542.755969.248720@o13g2000cwo.googlegroups.com> <1121889338.699737.244800@g43g2000cwa.googlegroups.com> <1121892299.067606.143910@z14g2000cwz.googlegroups.com> <1121899530.437296.324800@f14g2000cwb.googlegroups.com> Message-ID: dave.harper wrote: > > K7ITM wrote: > >>Huh? You wrote, "if tight winding results in a lower Q/other >>effects, why space the windings for air-core, crystal radio coils, >>period?" Do you not want a higher Q? Generally, people try for the >>highest unloaded Q they can get, under some set of constraints. > > > Sorry, I made a typo. Rather, why do people tight-wrap coils, period? > Just ease of construction? > > >>Close spacing lowers the Q mainly because the current in the wire is no >>longer radially symmetrical, if you look at a cross-section of the >>(round) wire. That raises the RF resistance of the wire. For decent >>(low-loss) form material, it's mainly the RF resistance of the wire >>that determines the loss and therefore the Q. Generally, highest Q for >>a given diameter and length is obtained by spacing the wire about two >>wire diameters, center to center, at least for high frequency work. If >>you want to use Litz wire, there's an optimum stranding...more, finer >>strands are not necessarily better as you get to either lower or higher >>frequencies. You should be able to find info on that, if you do some >>searching. > > > >>Cheers, >>Tom > > > Thanks for the information! Is there an advantage to wrapping cylinder > coils as opposed to spider or torroid, other than ease of construction? > I'm debating which one I'd likely get the best result with... I'll > probably make both to try it out, but I'd like to know which one would > 'probably' work best. > > Thanks again, > Dave > Me again...I should have read the later threads before my earlier reply. Tom is correct about the Q using litz. Some guys have tried 48 ga litz and said it nosedived in performance from the more-common 46 ga litz. I've seen that explained with a critique of skin depth in that the rf resistance of 48 is considerably higher at those freqs. Strand count seems to still be in the 'more-is-better' range at BCB. 660-strand is commonly used in DX sets...although I haven't graduated to that level of expenditure myself :) As to which to try....in a single-tuned set you won't notice the difference. If you have a strong local BCB station the toroid will do a very effective job of decreasing direct pickup by the coil. You might still want a trap inline, though. Guess which type of coil makes the best trap in this scenario! My own tests gave a slight nod to the spider web coil. Not enough to be noticeable in reception but enough for "spec-talk". The spider-web is also less prone to proximity effects and even direct pickup because it is 'directional'. My own dx set which is admittedly tailored for my particular environment uses a toroid on the first tuned stage, a toroid inline trap, then a spiderweb on the detector stage with a loose coupled trap made with a loopstick ferrite. A little of each, huh? I can receive stations within 80-100 kc of the 5kw local that is 1/4 mile away on 1370. My best recommendation would be to seriously consider a double-tuned set. Its a whole different world than a single-tuned one. -Bill Article: 93734 of rec.radio.amateur.homebrew Date: Wed, 20 Jul 2005 21:08:36 -0400 From: -ex- Subject: Re: coupling loop for loop antenna References: <3302-42DEECFF-96@storefull-3251.bay.webtv.net> Message-ID: <4dc69$42def598$4232bd15$9843@COQUI.NET> Jim wrote: > i see two different designs on the net for receiving loops. one is to > wind the pickup loop with the main loop, and another is to use a 1/5 > size loop off center at the bottom. what are the pros and cons for each > setup? what benefit is there to a pickup winding as opposed to just > inductive coupling to the internal loopstick by proximity? > Probably more than anything else the preference would be determined by what type of radio you're coupling to. Fer instance...a set with a built-in antenna and no external ant connection would HAVE TO be done by proximity...or else winding a coupling loop onto the built-in antenna :) A set with external antenna connections only often has no internal ant to couple to. There's shades of grey between those two but thats the basic pro/con. -Bill Article: 93735 of rec.radio.amateur.homebrew From: Jim Adney Subject: Re: Silver Mica vs Mica Caps Date: Wed, 20 Jul 2005 20:06:16 -0500 Message-ID: References: <23000$42db3af0$4232be43$20080@COQUI.NET> On Mon, 18 Jul 2005 01:15:24 -0400 -ex- wrote: >Nowadays, I'm not sure exactly what it is I'm buying when I buy the >"dipped mica" caps. I'm confident to say they are better than the >old-timers but are they silver plated onto mica or what? They are plated, but I don't know for sure that there is any sliver in the process. Perhaps there never was.... I share your confidence, but only time will tell for sure. - ----------------------------------------------- Jim Adney jadney@vwtype3.org Madison, WI 53711 USA ----------------------------------------------- Article: 93736 of rec.radio.amateur.homebrew From: "Reg Edwards" Subject: Re: coupling loop for loop antenna Date: Thu, 21 Jul 2005 08:42:24 +0000 (UTC) Message-ID: References: <3302-42DEECFF-96@storefull-3251.bay.webtv.net> "Jim" wrote in message news:3302-42DEECFF-96@storefull-3251.bay.webtv.net... > i see two different designs on the net for receiving loops. one is to > wind the pickup loop with the main loop, and another is to use a 1/5 > size loop off center at the bottom. what are the pros and cons for each > setup? what benefit is there to a pickup winding as opposed to just > inductive coupling to the internal loopstick by proximity? ================================== The coupling and main loops behave as the primary and secondary windings on an impedance matching transformer. The number of turns is fixed at 1 to 1. So the impedance matching is done by using different loop diameters. The 1/5 diameter coupling loop matches the antenna to a 50 ohm receiver or transmitter. The large diameter coupling loop matches the antenna to a high impedance receiver such as 1000 ohms. Theoretically, the impedance matching ratio is equal to the square of the loop diameter ratio. The receiver input impedance is usually known. The trouble is to find the impedance of the loop antenna. But it is not a critical matter. ---- Reg, G4FGQ Article: 93737 of rec.radio.amateur.homebrew Date: Thu, 21 Jul 2005 11:52:22 +0200 From: PaoloC Subject: Software tool for XTAL checks: xtalfind 2.0 Message-ID: <42df7002$1_2@x-privat.org> Hi, I am glad to inform you that I have updated my 'xtalfind' program to include tests for software defined DC receivers and DRM converters. xtalfind is a Perl script that, given a (list of) XTAL frequency, returns all its possible uses for HAM applications, (sub)harmonics included. Currently xtalfind checks for the following matches: * DC RX or TX (HAM bands) * RX with 455kHz IF (HAM bands) * RX with 10MHz IF (HAM bands) * RX with 12kHz IF (HAM bands) * RX with custom IF (HAM bands) * SDR LO=4*F (HAM bands) * DRM converter 455-12kHz * DRM converter 9011-12kHz (ICOMs) * DRM DC RX for known DRM broadcasts You can see a sample output from a previous release at http://spazioinwind.libero.it/ik1zyw/hardware/myxtals You can download the software from http://spazioinwind.libero.it/ik1zyw/software/xtalfind-2.0.tar.gz The Perl interpreter is available for most operating systems, so xtalfind should run almost anywhere. Don't throw a XTAL before asking xtalfind! :-) Never underestimate the power of weird frequency XTALs! ;-) 73, Paolo IK1ZYW Article: 93738 of rec.radio.amateur.homebrew From: "RadioGuy" Subject: Anderson 'Powerpole' Connectors Message-ID: Date: Thu, 21 Jul 2005 13:42:06 GMT After hurricane Charley passed overhead (official track had it passing directly overhead of my house) blowing off roofs and downing powerlines---we were out of power for a week, I decided to review my emgergency equipment capabilites. After extensive Internet study I learned that the power connectors of choice, endorsed as standards by the ARRL, ARES and RACES for emergency hookups are the Anderson 'Powerpole' connectors. Using the same connector body but different internals parts provided a connector with current capability up to 45 amps. The concept of a 'genderless' connector was also mentioned. I purchased a large quantity of the 15, 30 and 45 amp connectors along with the special crimping tool and began to exchange all my old connectors with the new 'Powerpole' connectors. When I first got the 'Powerpole' connectors about a year ago and played with them something odd about them caught my attention but I could not explain why. A couple of days ago while making connections I discovered that the 'genderless' capabilities of the connector allowed them to be connected side-to-side, in otherwords, red-to-black, or black-to-red. The possibility of making a direct short to ground---especially from an automotive battery exists (grounded chassis/negative ground)! Using the 'Powerpole' connectors makes it imperative that fuses be inserted inline, not only with the battery positive terminal as is common practice, but ideally with both sides of the power leads on the equipment side. The connectors I used in the past and standardized on were the Amphenol two pin connectors. The ones with the wide and narrow blade. The female went to power source, and male to the equipment; furthermore, the cable clamp, that the 'Powerpole' connector do not have, kept the connecting wires from being pulled out or broken from repeated flexing. The Amphenol connectors were not only a gendered connector but could only be coupled one way---avoiding the problem of the 'Powerpole' connector. I won't change back to the Amphenol connectors; I'll stay with the 'Powerpole' connectors, but it sure makes them an awkward solution and 'Hammy' way of doing things that require a bit of care when using them---especially under emergency conditions. RG Article: 93739 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: CW filter/notch filter Date: Thu, 21 Jul 2005 17:25:07 +0000 (UTC) Message-ID: I'm looking for a circuit design to a CW filter centred around 1khz that's about 200hz wide and then rolls off very rapidly. I'm planning to build a AFC system for SSB, which has a 1khz pilot tone that will be used to lock the frequency correct. I then need a circuit with quite a tight notch around 1khz to kill off the pilot tone once it's been locked on, so you don't have an annoying whistle on the reciever. Can anyone possibly help with any circuit designs or where I can find some???? I've had a look at a twin tee filter, but I'm not familiar with this design. Would this be suitable, is it worth me reading more about it and learning, then using this? Thanks all, Sam Article: 93740 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Anderson 'Powerpole' Connectors Date: Thu, 21 Jul 2005 18:31:00 -0000 Message-ID: <11dvqf4eqouejcd@corp.supernews.com> References: In article , RadioGuy wrote: >When I first got the 'Powerpole' connectors about a year ago and played with >them something odd about them caught my attention but I could not explain >why. A couple of days ago while making connections I discovered that the >'genderless' capabilities of the connector allowed them to be connected >side-to-side, in otherwords, red-to-black, or black-to-red. True 'nuff. If you do this, and also have a secondary ground path present (e.g. through the antenna system), bad things could occur. The chances of this can be reduced by: - Not trying to plug 'em together by touch alone. - Pick a standard orientation (most ARES groups have standardized on a "Red on the right, when looking into the connector, contact tongues are on the top" orientation). - Assemble the connectors in advance of need. - Secure the red and black connectors together after slip-fitting them, so that they can't come apart and be reconnected incorrectly. Anderson provides "roll pins" for this purpose, to lock 'em together, but I've heard some people say that these can vibrate out of the connectors. I prefer to use a drop of Crazy Glue or acetone to permanently bond 'em together. > The possibility >of making a direct short to ground---especially from an automotive battery >exists (grounded chassis/negative ground)! Using the 'Powerpole' connectors >makes it imperative that fuses be inserted inline, not only with the battery >positive terminal as is common practice, but ideally with both sides of the >power leads on the equipment side. Good advice! Whenever I build equipment for 12-volt plug-in use, I prefer to stick a reverse-polarity diode across the line, right after the equipment's main 12-volt fuse. During normal operation there's no current flow in the diode and no voltage drop (unlike what a forward-biased diode in series with the line would cause). If the equipment is accidentally hooked up with polarity reversed, the diode clamps the reverse voltage and the fuse blows instantly, almost entirely eliminating the risk of damage to the equipment. >I won't change back to the Amphenol connectors; I'll stay with the >'Powerpole' connectors, but it sure makes them an awkward solution and >'Hammy' way of doing things that require a bit of care when using >them---especially under emergency conditions. You raise a valid point. I have yet to hear of this actually happening in practice, but it's certainly possible. I'm told that the underwater-diving industry has been using PowerPole connectors for years - a local diver who became a ham last year was overjoyed to finally learn how and where to get "diving light" connectors at a reasonable (non-dive-shop) price. I'll have to ask him whether he knows of any such accidental-reverse-hookup problems in that industry. -- 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: 93741 of rec.radio.amateur.homebrew From: "RadioGuy" References: <6294-42D94D12-102@storefull-3255.bay.webtv.net> <42DA3D21.4080306@bloomer.net> <42da3e51$1_2@x-privat.org> <1121725307.731291@r2d2.vermontel.net> Subject: Re: build a variable capacitor Message-ID: Date: Thu, 21 Jul 2005 18:37:33 GMT Jozef wrote in message news:1121725307.731291@r2d2.vermontel.net... > I have recently built a very large pi-network transmatch with two very big > homemade variable capacitors. They can be seen at: > http://www.metaphoria.us/hamradio/transmatch.html > > Jozef > WB2MIC Very nicely done... I toyed with the idea of designing a couple of flat dies to punch out the stator and rotor plates and market my own series of capacitors. I agree, the high price of those capacitors are unwarranted. There was no need for two variables in that tuner... a single DIFFERENTIAL capacitor would do nicely and eliminate the extra adjustment during tune-up. For some unknown reason Hams still need a tuner with two capacitors---it was nice to see MFJ offer the Differential-T tuner Model 986. Many years ago (before the MFJ 986 tuner) as an experiment I built a field expedient tuner using a differential capacitor made from two telescoping cardboard tubes and aluminum foil (two plates outer and one plate inner tube) and slid the inner tube in and out to acheive an antenna match with a 28 microhenry tapped coil. It worked fine at 100 watts and many contacts were made with the end fed wire but dilectric heating of the cardboard tubes was observed. RG Article: 93742 of rec.radio.amateur.homebrew From: "RadioGuy" References: <11dvqf4eqouejcd@corp.supernews.com> Subject: Re: Anderson 'Powerpole' Connectors Message-ID: Date: Thu, 21 Jul 2005 19:04:42 GMT Dave Platt wrote in message news:11dvqf4eqouejcd@corp.supernews.com... > In article , > RadioGuy wrote: > > >When I first got the 'Powerpole' connectors about a year ago and played with > >them something odd about them caught my attention but I could not explain > >why. A couple of days ago while making connections I discovered that the > >'genderless' capabilities of the connector allowed them to be connected > >side-to-side, in otherwords, red-to-black, or black-to-red. > > True 'nuff. If you do this, and also have a secondary ground path > present (e.g. through the antenna system), bad things could occur. > > The chances of this can be reduced by: > > - Not trying to plug 'em together by touch alone. > > - Pick a standard orientation (most ARES groups have standardized on > a "Red on the right, when looking into the connector, contact > tongues are on the top" orientation). > > - Assemble the connectors in advance of need. > > - Secure the red and black connectors together after slip-fitting them, > so that they can't come apart and be reconnected incorrectly. > Anderson provides "roll pins" for this purpose, to lock 'em > together, but I've heard some people say that these can vibrate out > of the connectors. I prefer to use a drop of Crazy Glue or acetone > to permanently bond 'em together. [snip] Thanks for the reply Dave. That's precisely the point I'm trying to make. My connectors are oriented in the preferred ARES configruation and crazy glued together but that doesn't mean anything. You can still can mate the assembled connectors together side-to-side, red-to-black and black-to-red. The only options of preventing this from happening are to carefully observe the mating of the connectors and use fused leads to protect against shorts resulting from misalignment. RG Article: 93743 of rec.radio.amateur.homebrew From: "Samuel Hunt" Subject: Re: CW filter/notch filter Date: Thu, 21 Jul 2005 20:23:59 +0000 (UTC) Message-ID: References: I've found an excellent bandpass filter. It's 4 pole and is supposed to be a CW filter. When I tune it up, it works really nicely to pass about 250hz 3dB bandwidth, then has incredibly sharp edges so at 500hz BW, it's about 20dB down, and then just rolls off more. This is almost perfect for what I want. Now the only thing is finding a tight notch filter that does similar, but the opposite, the tighter the better. Really I want to try to kill off my 1khz carrier, when it's no more than 50hz away, so it needs 100hz BW then be rolled off at about 200hz. After I've got these circuits sorted, I might be ready to "trial" earlier than I originally thought. Sam "Samuel Hunt" wrote in message news:dbolpj$3ij$1@nwrdmz01.dmz.ncs.ea.ibs-infra.bt.com... > I'm looking for a circuit design to a CW filter centred around 1khz that's > about 200hz wide and then rolls off very rapidly. > > I'm planning to build a AFC system for SSB, which has a 1khz pilot tone > that will be used to lock the frequency correct. > > I then need a circuit with quite a tight notch around 1khz to kill off the > pilot tone once it's been locked on, so you don't have an annoying whistle > on the reciever. > > > Can anyone possibly help with any circuit designs or where I can find > some???? > > I've had a look at a twin tee filter, but I'm not familiar with this > design. Would this be suitable, is it worth me reading more about it and > learning, then using this? > > > Thanks all, > > Sam > Article: 93744 of rec.radio.amateur.homebrew From: inagaddadavida@webtv.net (Jim) Subject: Re: coupling loop for loop antenna Date: Thu, 21 Jul 2005 18:11:33 -0500 Message-ID: <20258-42E02BA5-354@storefull-3256.bay.webtv.net> References: <3302-42DEECFF-96@storefull-3251.bay.webtv.net> ok, now i am getting somewhere! first this, i have several cheap portable am/fm/sw radios. specifically i have sangean ats606, sangean ats505 and sangean ats818. all have built in antennas and plugs for external am/sw antennas. i am experimenting with a loop for a versatile portable antenna. i know that it wont beat an outdoor antenna, but i want something portable that beats the built in antennas. i am trying to make a loop for am(mw) and a loop for sw on the same form with a common output. i could switch the am winding or the sw winding in as needed. the high or low impedance quality of the different styles of output winding is interesting also. the high impedance would be useful on sw when the whip is the only place to connect an antenna to. thanks to all for their opinions! Article: 93745 of rec.radio.amateur.homebrew From: Eamon Skelton Subject: Re: QUESTION: Homebrew Near Field 3Ghz Frequency Meter. Message-ID: References: <1121982703.888190.178630@g14g2000cwa.googlegroups.com> Date: Fri, 22 Jul 2005 01:07:27 +0000 On Thu, 21 Jul 2005 14:51:43 -0700, Timothy wrote: > There are plenty of homebrew frequency meters on the market, basically > amp, PIC and display. Problem is I haven't seen one yet that works > above about 50Mhz. Does anyone know of a circuit diagram for something > capable of about 3Ghz? Something like a homebrewed version of the > Optoelectonics offerings..... > > Thanks, > > Tim I built one last year. I used a PIC16F628 and LCD display. The HF input uses a 74F74 as a 1:4 prescaler and works up to about 150MHz. The UHF input uses a Fujitsu 1:128 prescaler, IIRC it is an MB510. The prescaler is rated for 2.7GHz. I have used mine up to 1300MHz. The timebase is a very high quality 9MHz TCXO from Ericsson mobile phone equipment. It never wanders more than 1Hz away from my 10MHz oven controlled oscillator. At HF, gate times are 400mS and 4S for 10Hz and 1Hz resolution. At UHF the gate times are 1.28S and 12.8S giving a resolution of 100Hz and 10Hz. I don't have a schematic of the counter. Most of the hardware design is stolen from my old display/stabiliser circuit: http://www.eircom.net/~ei9gq/stab.html (from memory?). The PIC and lower frequency circuitry is on Veroboard. The VHF/UHF is built dead bug style on copper clad board. 73 Ed. EI9GQ. -- Linux 2.6.12.1 Remove 'X' to reply by e-mail. Article: 93746 of rec.radio.amateur.homebrew From: drwxr-xr-x Subject: Re: CW filter/notch filter Date: 22 Jul 2005 00:56:15 GMT Message-ID: References: <1121989020.770510.116450@g14g2000cwa.googlegroups.com> On 21 Jul 2005 16:37:00 -0700, K7ITM wrote: > A switched-capacitor (commutating) filter can put a potentially very > sharp notch at a frequency determined by its clock. I assume in this > AFC that you'll have access to the frequency you're trying to filter > out. If you use an 8-capacitor version of the filter, you just need to > clock it at 8* the freq you want to remove. > > You CAN also design a continuous-time band-stop filter. > > (Soap-box comment: seems like this would all be a lot easier if you > just digitized the signal at 8k samples/second, making detection and > removal of fs/8 pretty easy... or just transmit the SSB with a > suppressed carrier that you don't have to worry about removing.) Soap-box comment: What are you nattering on about? Oh, I see: X-Trace: posting.google.com Article: 93747 of rec.radio.amateur.homebrew From: Eamon Skelton Subject: Re: QUESTION: Homebrew Near Field 3Ghz Frequency Meter. Message-ID: References: <1121982703.888190.178630@g14g2000cwa.googlegroups.com> <1121988203.022198.241470@g49g2000cwa.googlegroups.com> Date: Fri, 22 Jul 2005 12:52:52 +0000 On Thu, 21 Jul 2005 16:23:23 -0700, K7ITM wrote: > Several companies make prescalers. They tend to be > expensive and not very easy to find. Dead sat-tv receivers and some UHF tv tuners are a good source of prescalers. I have never paid money for one. 73, Ed. EI9GQ. -- Linux 2.6.12.1 Remove 'X' to reply by e-mail. Article: 93748 of rec.radio.amateur.homebrew From: "Tony" Date: Fri, 22 Jul 2005 22:23:50 Subject: 100+million now cannot see your ads! Message-ID: <42e0e55d$0$15933$afc38c87@news.optusnet.com.au> We have launched Hover-iT Lite and will launch Hover-iT Pro later on this month and we are looking for affiliate partners to resell these programs to their list of clients or to promote as part of their range of affiliate programs. Hover ads are the next generation in Banner and Pop up advertising as they can be designed to be very appealing and attention grabbing but also not intrusive. Check out some of the features http://www.hover-it.com Web masters or any one who has a web site can insert any HTML, Flash, Java, Form ect documents they want and blend it in with the page. Effects to choose from are "Fade" "Drop Down" "Scroll Down" "Scroll out" "Wiggle" etc. Unlike Pop ups hover ads CANNOT be blocked UNLESS a user chooses to do so. Pop up blockers CANNOT block hover ads. ***They are ideal for quick product offers and reminders for: Opt in Forms, Free gifts, Timed promotions, Booking events notifications, Alerts on updates, Special offers, Receive e-mail addresses ( special inbuilt form) And can be triggered to appear anywhere on the page and at any time.*** We are offering up to 60% on the PRO version when it is released in the meantime you can check out the Lite version at http://www.hover-it.com. Please contact me using the information below: ______________________________________________________ This message complies with the latest Spam guidelines it contains unsubscribe links and contact details. if this message is NOT intended for your news group or you do NOT allow these type of posts please send a blank message to unsubscribe@moneywebpage.com _____________________________________________________ Tony Saffioti TSR PTY LTD PO BOX 75 RAMSGATE N.S.W 2217 AUSTRALIA PH: 61 02 9531 2058 FAX: 61 02 9531 2068 or e-mail Tony@hover-it.com --- MAF Anti-Spam ID: 20050625214348T8a8PkF3 Article: 93749 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA: Last few hours for Collins/Heath 6146A's(Syl) Message-ID: Date: Fri, 22 Jul 2005 12:46:28 GMT NOS Sylvania 6146A'S X2, for some Colling/ heath etc that need 'A' 6146, SEE AT: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Other stuff coming along, thanks for looking: heytubeguy Article: 93750 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:VY RARE/NICE McMurdo Silver 5C+'Buy it now' Message-ID: <_c8Ee.22749$5N3.3598@bgtnsc05-news.ops.worldnet.att.net> Date: Fri, 22 Jul 2005 15:24:42 GMT FA at ebay address below. Pse read description and shipping info carefully on this very rare working unit from 1932-33 era: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy Tnx 73, heytueguy Article: 93751 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: Anderson 'Powerpole' Connectors Date: Fri, 22 Jul 2005 14:21:14 -0400 Message-ID: References: <11dvqf4eqouejcd@corp.supernews.com> In article <11dvqf4eqouejcd@corp.supernews.com>, dplatt@radagast.org (Dave Platt) wrote: > - Secure the red and black connectors together after slip-fitting them, > so that they can't come apart and be reconnected incorrectly. > Anderson provides "roll pins" for this purpose, to lock 'em > together, but I've heard some people say that these can vibrate out > of the connectors. I prefer to use a drop of Crazy Glue or acetone > to permanently bond 'em together. Dave- Anderson may supply the roll pins if you ask, but they don't come with the connectors. I found out about the adoption by various emergency organizations such as RACES, and converted all of my equipment. I started with a roll pin in each pair, but soon noticed that over half of the pins had fallen out. Fortunately there was no damage from pins falling into live electronic equipment. Thinking I just had the wrong roll pins, I tried to buy some from an Anderson dealer. That is where I heard about using Crazy Glue. I hadn't considered offsetting the connectors so black and red could connect. Yes, that would be a problem, so don't to that! Although Anderson Power Poles seem like a good idea, I'm by myself around here. The local RACES/ARES guys insist on using Molex connectors as their standard (IC-22A compatible), ignoring that they aren't rated for the current their modern equipment uses. 73, Fred, K4DII Article: 93752 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: CW filter/notch filter Date: Fri, 22 Jul 2005 14:41:18 -0400 Message-ID: References: <1121989020.770510.116450@g14g2000cwa.googlegroups.com> In article <1121989020.770510.116450@g14g2000cwa.googlegroups.com>, "K7ITM" wrote: >... or just transmit the SSB with a > suppressed carrier that you don't have to worry about removing.) Tom & Sam- That is what I was going to suggest. It is a common practice to send a partially reduced carrier that doesn't eat up a lot of power, but allows you to synchronize to it using a synchronous detector. When detected, the carrier translates to zero frequency relative to the modulation, so it can be eliminated by a DC-blocking capacitor. I think such a system is in use by some foreign broadcasters. (I'm thinking one is at 21.455 MHz?) It doesn't sound quite right using an AM detector. It can be received on an SSB receiver, but you have to carefully tune it so music sounds right. If you insist on the 1 KHz pilot tone approach, you could end up with both the pilot tone and a small vestige of the suppressed carrier. Your filter system might lock-up on either the pilot tone or the carrier! 73, Fred, K4DII Article: 93753 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Anderson 'Powerpole' Connectors Date: Fri, 22 Jul 2005 18:45:30 -0000 Message-ID: <11e2fmamjkttk99@corp.supernews.com> References: <11dvqf4eqouejcd@corp.supernews.com> In article , >> - Secure the red and black connectors together after slip-fitting them, >> so that they can't come apart and be reconnected incorrectly. >> Anderson provides "roll pins" for this purpose, to lock 'em >> together, but I've heard some people say that these can vibrate out >> of the connectors. I prefer to use a drop of Crazy Glue or acetone >> to permanently bond 'em together. > >Dave- > >Anderson may supply the roll pins if you ask, but they don't come with the >connectors. Seems to depend on the distributor, then. One merchant from whom I bought PowerPoles at Pacificon a couple of years ago included them in the bag. PowerWerx sells them separately, and I don't bother buying them. >I found out about the adoption by various emergency organizations such as >RACES, and converted all of my equipment. I started with a roll pin in >each pair, but soon noticed that over half of the pins had fallen out. >Fortunately there was no damage from pins falling into live electronic >equipment. Other people seem to have had the same experience. >Thinking I just had the wrong roll pins, I tried to buy some from an >Anderson dealer. That is where I heard about using Crazy Glue. > >I hadn't considered offsetting the connectors so black and red could >connect. Yes, that would be a problem, so don't to that! Yup. >Although Anderson Power Poles seem like a good idea, I'm by myself around >here. The local RACES/ARES guys insist on using Molex connectors as their >standard (IC-22A compatible), ignoring that they aren't rated for the >current their modern equipment uses. Are those the old-style stamped-metal round Molex pins, such as one finds in a PC power supply cable, or are they using the flat-metal "OEM T" connector used by a lot of the radio manufacturers these days? I can't tell from the picture in the IC-22 manual I downloaded. I really loathe the round-pin Molex - it really doesn't seem like a design that will either stand up to repeated cyclings, or handle a lot of current. -- 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: 93754 of rec.radio.amateur.homebrew From: "Polymath" Subject: A F.A.Q. for Ham Radio Date: Fri, 22 Jul 2005 22:25:01 +0100 Message-ID: <42e163e0$1_1@x-privat.org> What is Ham Radio? Ham Radio is a technical pursuit for those who are interested in the science of radio wave propagation and who are also interested in the way that their radios function. It has a long-standing tradition of providing a source of engineers who are born naturals. Ham Radio awakens in its aficionados a whole-life fascination with all things technical and gives an all-abiding curiosity to improve one's scientific knowledge. It's a great swimming pool, please dive in! This excitement causes a wish to share the experience with ones fellow man, and shows itself in the gentlemanly traditions of Ham Radio. Radio Hams are qualified to design, build and then operate their own pieces of equipment. They do this with gusto, and also repair and modify their own equipment. The excitement that drives a Radio Ham starts with relatively simple technologies at first, perhaps making his own Wimshurst machine and primary cells. Small pieces of test equipment follow, possibly multimeters and signal generators. Then comes receivers and transmitters. It is with the latter that communication with like-minded technically motivated people takes off. The scope for technical development grows with the years and now encompasses DSP and DDS. There is also a great deal of excitement in the areas of computer programming to be learnt and applied. The technical excitement motivates Radio Hams to compete with each other to determine who has designed and manufactured the best-quality station. This competitiveness is found in DXing, competitions and fox-hunts. -----OOOOO---- However, beware! A Ham Radio licence is such a desirable thing to have that there are large numbers of people who wish to be thought of as Radio Hams when, in fact, they are nothing of the kind! Usually such people are a variation of the CB Radio hobbyist; they buy their radios off the shelf and send them back to be repaired; they are not interested in technical discussion and sneer at those who are; they have no idea how their radios work inside and have no wish to find out; they are free with rather silly personal insults; they have not satisfied any technical qualification and their licences prevent the use of self-designed-and-built equipment. These CB types engage in the competitive activities with their Cheque-Book-purchased off-the-shelf radios in a forlorn effort to prove that they are Radio Hams. No _REAL_ Radio Hams are deceived by such people! Article: 93755 of rec.radio.amateur.homebrew From: "Howard" References: <42e163e0$1_1@x-privat.org> Subject: Re: A F.A.Q. for Ham Radio Date: Fri, 22 Jul 2005 22:53:11 +0100 Message-ID: <42e16ac7$1_3@mk-nntp-2.news.uk.tiscali.com> Sounds a bit like Amateur Radio. H. "Polymath" wrote in message news:42e163e0$1_1@x-privat.org... > What is Ham Radio? > > Ham Radio is a technical pursuit for those who > are interested in the science of radio wave > propagation and who are also interested in the > way that their radios function. It has a long-standing > tradition of providing a source of engineers who > are born naturals. > > Ham Radio awakens in its aficionados a whole-life > fascination with all things technical and gives > an all-abiding curiosity to improve one's scientific > knowledge. It's a great swimming pool, please dive in! > > This excitement causes a wish to share the experience > with ones fellow man, and shows itself in the > gentlemanly traditions of Ham Radio. > > Radio Hams are qualified to design, build and then > operate their own pieces of equipment. They do this > with gusto, and also repair and modify their own > equipment. > > The excitement that drives a Radio Ham starts with > relatively simple technologies at first, perhaps making > his own Wimshurst machine and primary cells. Small pieces > of test equipment follow, possibly multimeters and signal > generators. Then comes receivers and transmitters. It is with > the latter that communication with like-minded technically > motivated people takes off. The scope for technical > development grows with the years > and now encompasses DSP and DDS. There is also a great deal > of excitement in the areas of computer programming to > be learnt and applied. > > The technical excitement motivates Radio Hams to compete > with each other to determine who has designed and manufactured > the best-quality station. This competitiveness is found in DXing, > competitions and fox-hunts. > > -----OOOOO---- > > However, beware! A Ham Radio licence is such a > desirable thing to have that there are large > numbers of people who wish to be thought of > as Radio Hams when, in fact, they are nothing > of the kind! Usually such people are a > variation of the CB Radio hobbyist; they buy their > radios off the shelf and send them back to be > repaired; they are not interested in technical discussion > and sneer at those who are; they have no idea how > their radios work inside and have no wish to find out; > they are free with rather silly personal insults; > they have not satisfied any technical qualification > and their licences prevent the use of > self-designed-and-built equipment. > > These CB types engage in the competitive activities > with their Cheque-Book-purchased off-the-shelf radios > in a forlorn effort to prove that they are Radio Hams. > > No _REAL_ Radio Hams are deceived by such people! > > > > Article: 93756 of rec.radio.amateur.homebrew From: "Tom Donaly" Subject: Re: A F.A.Q. for Ham Radio References: <42e163e0$1_1@x-privat.org> Message-ID: Date: Fri, 22 Jul 2005 22:35:05 GMT Polymath wrote: > What is Ham Radio? > > Ham Radio is a technical pursuit for those who > are interested in the science of radio wave > propagation and who are also interested in the > way that their radios function. It has a long-standing > tradition of providing a source of engineers who > are born naturals. > > Ham Radio awakens in its aficionados a whole-life > fascination with all things technical and gives > an all-abiding curiosity to improve one's scientific > knowledge. It's a great swimming pool, please dive in! > > This excitement causes a wish to share the experience > with ones fellow man, and shows itself in the > gentlemanly traditions of Ham Radio. > > Radio Hams are qualified to design, build and then > operate their own pieces of equipment. They do this > with gusto, and also repair and modify their own > equipment. > > The excitement that drives a Radio Ham starts with > relatively simple technologies at first, perhaps making > his own Wimshurst machine and primary cells. Small pieces > of test equipment follow, possibly multimeters and signal > generators. Then comes receivers and transmitters. It is with > the latter that communication with like-minded technically > motivated people takes off. The scope for technical > development grows with the years > and now encompasses DSP and DDS. There is also a great deal > of excitement in the areas of computer programming to > be learnt and applied. > > The technical excitement motivates Radio Hams to compete > with each other to determine who has designed and manufactured > the best-quality station. This competitiveness is found in DXing, > competitions and fox-hunts. > > -----OOOOO---- > > However, beware! A Ham Radio licence is such a > desirable thing to have that there are large > numbers of people who wish to be thought of > as Radio Hams when, in fact, they are nothing > of the kind! Usually such people are a > variation of the CB Radio hobbyist; they buy their > radios off the shelf and send them back to be > repaired; they are not interested in technical discussion > and sneer at those who are; they have no idea how > their radios work inside and have no wish to find out; > they are free with rather silly personal insults; > they have not satisfied any technical qualification > and their licences prevent the use of > self-designed-and-built equipment. > > These CB types engage in the competitive activities > with their Cheque-Book-purchased off-the-shelf radios > in a forlorn effort to prove that they are Radio Hams. > > No _REAL_ Radio Hams are deceived by such people! > > > > Another day, another wretched, little troll from another mediocre mind so filled with the desire to be recognized it has to argue phantasms so people will notice. As has commonly been said, it's more to be pitied than scorned. 73, Tom Donaly, KA6RUH Article: 93757 of rec.radio.amateur.homebrew From: Spike Subject: Re: A F.A.Q. for Ham Radio Date: Fri, 22 Jul 2005 23:39:00 +0100 Message-ID: References: <42e163e0$1_1@x-privat.org> Tom Donaly wrote: >Another day, another wretched, little troll from another >mediocre mind so filled with the desire to be recognized it has to >argue phantasms so people will notice. As has commonly been said, >it's more to be pitied than scorned. Quite. But there's no need to repost the whole bloody thing. from Aero Spike Article: 93758 of rec.radio.amateur.homebrew From: Frank Turner-Smith G3VKI Subject: Re: A F.A.Q. for Ham Radio References: <42e163e0$1_1@x-privat.org> Message-ID: Date: Fri, 22 Jul 2005 22:59:32 GMT Tom Donaly wrote: > Polymath wrote: > >> What is Ham Radio? >> < crap snipped > >> > > Another day, another wretched, little troll from another > mediocre mind so filled with the desire to be recognized it has to > argue phantasms so people will notice. As has commonly been said, > it's more to be pitied than scorned. > 73, > Tom Donaly, KA6RUH I agree, but it's fun taking the piss out of him. -- ;-) 73 de Frank Turner-Smith G3VKI - mine's a pint. http://turner-smith.co.uk Article: 93759 of rec.radio.amateur.homebrew From: "Graham" References: <42e163e0$1_1@x-privat.org> Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 00:52:18 +0100 Message-ID: <42e18697$1_3@mk-nntp-1.news.uk.worldonline.com> "Polymath" wrote in message news:42e163e0$1_1@x-privat.org... > What is Ham Radio? What is Ham Radio Poly? I have never considered myself to be a Ham When exactly did Amateurs in this country (apart from the Tony Hancock character) become Hams? -- Graham. G3ZVT %Profound_observation% Article: 93760 of rec.radio.amateur.homebrew From: andrew Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 00:57:26 +0100 Message-ID: References: <42e163e0$1_1@x-privat.org> <42e18697$1_3@mk-nntp-1.news.uk.worldonline.com> Graham wrote: > "Polymath" wrote in message > news:42e163e0$1_1@x-privat.org... >=20 >>What is Ham Radio? >=20 >=20 > What is Ham Radio Poly? > I have never considered myself to be a Ham > When exactly did Amateurs in this country (apart from the Tony Hancock > character) become Hams? >=20 OED definition of 'ham'.... ham =95 noun 1 an inexpert or unsubtle actor or piece of acting. 2 (also=20 radio ham) informal an amateur radio operator. =95 verb (hammed, hamming) informal overact. =97 ORIGIN perhaps from the first syllable of AMATEUR. Article: 93761 of rec.radio.amateur.homebrew From: Eamon Skelton Subject: Re: A F.A.Q. for Ham Radio Message-ID: References: <42e163e0$1_1@x-privat.org> Date: Sat, 23 Jul 2005 01:12:58 +0000 On Fri, 22 Jul 2005 22:25:01 +0100, Polymath wrote: > What is Ham Radio?........... Barely a twitch on the Troll-O-Meter. Yawn! Ed. EI9GQ. -- Linux 2.6.12.1 Remove 'X' to reply by e-mail. Article: 93762 of rec.radio.amateur.homebrew From: "RadioGuy" References: Subject: Re: Anderson 'Powerpole' Connectors Message-ID: Date: Sat, 23 Jul 2005 00:36:50 GMT After trying all the permutations and combinations of connector arrangements I have concluded there is no way the 'PowerPole' connectors can be configured to prevent a short-circuit as the connectors are presently designed. However, if the dovetails are altered (redesign of the injection mold) the connectors can be oriented 'on top of ' as opposed to the current 'side by side' orientation ---the new design will then allow the connectors halves to mate only ONE way. The connectors will no longer be 'mirrored' and as the 'PowerPole' connectors do not posess a gender a standard will be required regarding which connector half is used for the supply side and which is used for the equipment side. It is highly unlikely that Anderson will redesign the 'PowerPole' connector to meet the needs of the Ham community. It amazes me that this connector, with the potential of short-circuit from misalignment, could be considered a standard for power connections of emergency communications equipment. In review of the literature no mention is made of the possibility of improperly mating of these connectors. This must be the first time in my experience that equipment and power source must be fused to prevent a short-circuit resulting from improper connector mating---unbelievable. I think the 'PowerPole' connector has the earmark of a classic 'Ham boondoggle'. RG Article: 93763 of rec.radio.amateur.homebrew From: "Tom Donaly" Subject: Re: A F.A.Q. for Ham Radio References: <42e163e0$1_1@x-privat.org> Message-ID: Date: Sat, 23 Jul 2005 00:45:19 GMT Spike wrote: > Tom Donaly wrote: > > >>Another day, another wretched, little troll from another >>mediocre mind so filled with the desire to be recognized it has to >>argue phantasms so people will notice. As has commonly been said, >>it's more to be pitied than scorned. > > > Quite. But there's no need to repost the whole bloody thing. > > from > Aero Spike Ah, a fine example of childish, British pique. How superior of you. I'll tell you what, m'boy. From now on, I'll send all my posts to you before I post them so you can rewrite them to your satisfaction. Ha, ha! I've never read a more stereotypical post. 73, Tom Donaly, KA6RUH Article: 93764 of rec.radio.amateur.homebrew From: Chris Kirby Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 02:11:32 +0100 Message-ID: <1663e1l4f2m27o1d9lh2qemc9k38l0qtcq@4ax.com> References: <42e163e0$1_1@x-privat.org> Tom Donaly wrote: >Spike wrote: >> Tom Donaly wrote: >> >> >>>Another day, another wretched, little troll from another >>>mediocre mind so filled with the desire to be recognized it has to >>>argue phantasms so people will notice. As has commonly been said, >>>it's more to be pitied than scorned. >> >> >> Quite. But there's no need to repost the whole bloody thing. >> >> from >> Aero Spike > >Ah, a fine example of childish, British pique. How superior of you. >I'll tell you what, m'boy. From now on, I'll send all my posts to >you before I post them so you can rewrite them to your satisfaction. Good idea. Thanks. -- Chris Article: 93765 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: Anderson 'Powerpole' Connectors Date: Sat, 23 Jul 2005 04:23:49 -0000 Message-ID: <11e3hilskrvc579@corp.supernews.com> References: In article , RadioGuy wrote: >However, if the dovetails are altered (redesign of the injection mold) the >connectors can be oriented 'on top of ' as opposed to the current 'side by >side' orientation ---the new design will then allow the connectors halves to >mate only ONE way. The connectors will no longer be 'mirrored' and as the >'PowerPole' connectors do not posess a gender a standard will be required >regarding which connector half is used for the supply side and which is used >for the equipment side. This would eliminate the perceived (and actual) benefit of having a genderless arrangment, which lets you plug a battery into a radio (acting as a supply) or into a charger or power supply (acting as a load, for recharging), or into a distribution panel alongside radio connections (acting as a floating backup to a mains-powered supply). > It is highly unlikely that Anderson will redesign >the 'PowerPole' connector to meet the needs of the Ham community. Agreed. >It amazes me that this connector, with the potential of short-circuit from >misalignment, could be considered a standard for power connections of >emergency communications equipment. The PowerPoles have been around for quite a while, and have seen a lot of use in fields other than ham radio. I'm curious as to whether you can cite evidence that the problem you forsee, actually occurs in practice? > In review of the literature no mention >is made of the possibility of improperly mating of these connectors. This >must be the first time in my experience that equipment and power source must >be fused to prevent a short-circuit resulting from improper connector >mating---unbelievable. All power sources must be fused, in any case, in order to provide protection against short circuits. In a mobile setting, it's canon that both the hot and neutral should be fused, as close to the battery as possible, in order to avoid dangerous ground-wire currents if the alternator ground wire pops loose from the battery. I'm not convinced that the PowerPole arrangement requires any additional fusing, above and beyond what's normal and appropriate for ham gear. Proper fusing on the hot side of the source ought to be sufficient to result in an immediate fuse-blow under any PowerPole misconnection arrangment I've been able to envision. As I see it, if a PowerPole set is correctly wired, there are four ways to try to mate it. One is correct, and works. One has the connectors rotated 180 degrees out of phase - doesn't mate, no problem. One way has them rotated correctly, but offset in one direction - radio's "hot" goes to supply ground, radio's ground is unconnected (or occurs via the antenna or chassis mount). This one seems completely benign, as the radio is connected only to ground - radio doesn't power up, but there seems to be no potential for damage. The fourth case is the only arguably problematic one, as it connects the supply hot to the radio ground. This seems very likely to blow the supply fuse, either instantly or the moment the radio chassis touches ground. I don't see the need for a separate fuse in the radio's own ground lead, as long as the supply fuse is of the proper value for the installation. > I think the 'PowerPole' connector has the earmark >of a classic 'Ham boondoggle'. I concede the possibility, in principle, of mismatings of the sort you mention. I've not ever heard of any occurring in practice. -- 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: 93766 of rec.radio.amateur.homebrew From: dplatt@radagast.org (Dave Platt) Subject: Re: anyone know about kit modifation to CW rigs for RTTY or other digital modes Date: Sat, 23 Jul 2005 04:33:05 -0000 Message-ID: <11e3i41qkdkcje7@corp.supernews.com> References: <1122079369.854847.47250@g43g2000cwa.googlegroups.com> In article <1122079369.854847.47250@g43g2000cwa.googlegroups.com>, an_old_friend wrote: >Back a long (pre 2000)while in Policy someone was tlaking about it >being easy to modify one the lowpower CW transceiver kits for some or >other digital modes > >Anyone have some thoiught and info on this With Nocde HF comming I'd >love to build something that, either stand alone or laptop asisted It shouldn't be difficult to modify a VFO-tuned CW transmitter to transmit RTTY. You could do this with a varactor diode, in parallel with the main tuning capacitor - drive the varactor with a two-state variable voltage, to shift the transmit frequency the necessary number of Hz. If you have a VFO-tuned CW transceiver, which uses a varactor to offset the transmit and receive frequencies by the appropriate distance to generate a receive sidetone, then this transmit-offset circuit could probably be modified pretty easily for dual-offset RTTY operation. You might need to retune your receiver bandpass filter to widen the passband a bit... this would depend on the mode and the rig. You might be able to do something similar to this with a crystal-controlled QRP rig, but I suspect that pulling a crystal that far with a varactor might be somewhat difficult. This basic approach was, I believe, the preferred one for RTTY transmission years ago, back before sideband rigs had good carrier and opposite-sideband suppression. It can result in a cleaner RTTY signal than you'd get if you use AFSK modulation into a sloppy sideband transmitter. Doing more-sophisticated digital modulations (e.g. PSK31) would probably require starting with a sideband rig. -- 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: 93767 of rec.radio.amateur.homebrew From: "Paul" References: <42e163e0$1_1@x-privat.org> Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 07:45:31 +0100 Message-ID: <42e1e736$0$351$cc9e4d1f@news.dial.pipex.com> "Polymath" wrote in message news:42e163e0$1_1@x-privat.org... > What is Ham Radio? > Yawn Not only is he very boring he isnt even original....This is a copy of someone elses posts. Ah well...he probably has issues and cant cope with real life and struggles with cyberlife as he's hiding. We dont even know if he's a radio ham.....I hope not Cheers Paul MW0DCT Article: 93768 of rec.radio.amateur.homebrew From: Spike Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 09:07:25 +0100 Message-ID: References: <42e163e0$1_1@x-privat.org> Tom Donaly wrote: >Spike wrote: >> Tom Donaly wrote: >> >> >>>Another day, another wretched, little troll from another >>>mediocre mind so filled with the desire to be recognized it has to >>>argue phantasms so people will notice. As has commonly been said, >>>it's more to be pitied than scorned. >> >> >> Quite. But there's no need to repost the whole bloody thing. >> >> from >> Aero Spike > >Ah, a fine example of childish, British pique. How superior of you. >I'll tell you what, m'boy. From now on, I'll send all my posts to >you before I post them so you can rewrite them to your satisfaction. >Ha, ha! I've never read a more stereotypical post. >73, >Tom Donaly, KA6RUH Technically speaking, your post was at best impolite. There are plenty of people who have killfiled the OP, and your thoughtless action resulted in their KFs being bypassed. There are also plenty of people on dialup, who may have already downloaded the OP's rubbish, and don't want to pay again to download yet another copy. And, by the way, I suggest you put further posts where the sun doesn't shine. from Aero Spike Article: 93769 of rec.radio.amateur.homebrew From: doug dwyer Subject: TCXO Clipped Sine Wave (all my fault!!) Date: Sat, 23 Jul 2005 10:36:56 +0100 Message-ID: <9Prf9IB4+g4CFw0y@ddwyer.demon.co.uk> References: In message , Mario Bros writes >Hi folks, >I would have to ask a clarification regard to the TCXO. >They are found with output TTL, HCMOS and CLIPPED SINE WAVE. >It is just with respect to this last type that I would want to have >elucidations on when it is convenient to employ it, which the advantages and >the disadvantages and which the extension of spectral harmonicas. >In synthesis, from the plan point of view, which are the motivations that >they make to incline towards a Clipped oscillator? > >Anticipated thanks. > >73's de IK6GQC Rocco > > I designed some of the first TCXOs , simple oscillators manufactured they used no agc control and relied on the average oscillator maintaining circuit gain to drop to limit oscillation level. Hence clipped sine. I.E gain during the transition and no gain during limiting. This output then coupled to a buffer amp for isolation was the Lowest cost option. When logic compatibility was required a logic buffer or open collector provided. Also I note that (many years ago) when the first prototypes were required I looked through a junk box for any small case and selected most appropriate arbitary case. These TCXO OCXO case dimensions can now be found as standard from many TCXO / OCXO manufacturers around the world. -- dd Article: 93770 of rec.radio.amateur.homebrew From: doug dwyer Subject: Re: TCXO Clipped Sine Wave Date: Sat, 23 Jul 2005 10:50:18 +0100 Message-ID: <9ujP1eCaLh4CFwGU@ddwyer.demon.co.uk> References: In message , Mario Bros writes >Hi folks, >I would have to ask a clarification regard to the TCXO. >They are found with output TTL, HCMOS and CLIPPED SINE WAVE. >It is just with respect to this last type that I would want to have >elucidations on when it is convenient to employ it, which the advantages and >the disadvantages and which the extension of spectral harmonicas. >In synthesis, from the plan point of view, which are the motivations that >they make to incline towards a Clipped oscillator? > >Anticipated thanks. > >73's de IK6GQC Rocco > > A further note the ssb noise will depend on the crystal Q the noise level in the compensation circuit and the level of crystal oscillation. Best with no compensation circuit ie XO or OCXO The smallest crystals cannot be driven as hard as the bigger ones so dont go for the smallest case! The easiest way to indicate ssb noise may be to beat two identical oscillators together with a few HZ offset. Or lock one to the other using the voltage control line (exclusive or is the easiest PLL circuit?) The display the lock voltage on a scope. -- dd Article: 93771 of rec.radio.amateur.homebrew From: doug dwyer Subject: Re: Silver Mica vs Mica Caps Date: Sat, 23 Jul 2005 11:03:55 +0100 Message-ID: <5+nOxDDLYh4CFwnK@ddwyer.demon.co.uk> References: In message , Jim Adney writes >On Mon, 18 Jul 2005 01:15:24 -0400 -ex- wrote: > >>Nowadays, I'm not sure exactly what it is I'm buying when I buy the >>"dipped mica" caps. I'm confident to say they are better than the >>old-timers but are they silver plated onto mica or what? > >They are plated, but I don't know for sure that there is any sliver in >the process. Perhaps there never was.... > >I share your confidence, but only time will tell for sure. > >- >----------------------------------------------- > Jim Adney jadney@vwtype3.org > Madison, WI 53711 USA >----------------------------------------------- Mica used to be cleaved and plated then a lower costt mica reconstituted was employed all were silver evaporated. Dipped refers to the encapsulation. Low values had their tc altered by the encapsulation material. Modern npo ceramic chips are Much? Better. Also some porcelain are the best for Q ie loss. -- dd Article: 93772 of rec.radio.amateur.homebrew From: "Polymath" References: <42e163e0$1_1@x-privat.org> Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 12:49:24 +0100 Message-ID: <42e22f6f_2@x-privat.org> In consideration of the rather immature Childish Broadcast (CB) quoted below, any reasonable man would conjecture that "KA6RUH" is some form of Yankland CB licence. Ham Radio has traditions of international friendliness which seem to be lost on you. "Tom Donaly" wrote in message news:tweEe.5974$_%4.2288@newssvr14.news.prodigy.com... > Another day, another wretched, little troll from another > mediocre mind so filled with the desire to be recognized it has to > argue phantasms so people will notice. As has commonly been said, > it's more to be pitied than scorned. > 73, > Tom Donaly, KA6RUH Article: 93773 of rec.radio.amateur.homebrew From: "Polymath" References: <42e163e0$1_1@x-privat.org> Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 12:50:59 +0100 Message-ID: <42e22f6f$2_2@x-privat.org> The person with whom you are in discourse below, AKA "RVMJ", AKA "Mrs.Nugatory" is well-renowned for having the pedantic mind associated with a 13-year-old. "Tom Donaly" wrote in message news:zqgEe.6040$_%4.1166@newssvr14.news.prodigy.com... > Spike wrote: >> Tom Donaly wrote: >>>Another day, another wretched, little troll from another >>>mediocre mind so filled with the desire to be recognized it has to >>>argue phantasms so people will notice. As has commonly been said, >>>it's more to be pitied than scorned. >> Quite. But there's no need to repost the whole bloody thing. >> from >> Aero Spike > Ah, a fine example of childish, British pique. How superior of you. > I'll tell you what, m'boy. From now on, I'll send all my posts to > you before I post them so you can rewrite them to your satisfaction. > Ha, ha! I've never read a more stereotypical post. > 73, > Tom Donaly, KA6RUH Article: 93774 of rec.radio.amateur.homebrew From: "Mark" Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 12:10:58 +0000 (UTC) Message-ID: References: <42e163e0$1_1@x-privat.org> <42e1e736$0$351$cc9e4d1f@news.dial.pipex.com> FFS, killfile the twat- its only because of you idiots taking his bait I can see his posts. Mark Article: 93775 of rec.radio.amateur.homebrew From: "Polymath" Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sat, 23 Jul 2005 13:34:23 +0100 Message-ID: <42e23902$1_3@x-privat.org> > What is Ham Radio? > > Ham Radio is a technical pursuit for those who > are interested in the science of radio wave > propagation and who are also interested in the > way that their radios function. It has a long-standing > tradition of providing a source of engineers who > are born naturals. > > Ham Radio awakens in its aficionados a whole-life > fascination with all things technical and gives > an all-abiding curiosity to improve one's scientific > knowledge. It's a great swimming pool, please dive in! > > This excitement causes a wish to share the experience > with ones fellow man, and shows itself in the > gentlemanly traditions of Ham Radio. > > Radio Hams are qualified to design, build and then > operate their own pieces of equipment. They do this > with gusto, and also repair and modify their own > equipment. > > The excitement that drives a Radio Ham starts with > relatively simple technologies at first, perhaps making > his own Wimshurst machine and primary cells. Small pieces > of test equipment follow, possibly multimeters and signal > generators. Then comes receivers and transmitters. It is with > the latter that communication with like-minded technically > motivated people takes off. The scope for technical > development grows with the years > and now encompasses DSP and DDS. There is also a great deal > of excitement in the areas of computer programming to > be learnt and applied. > > The technical excitement motivates Radio Hams to compete > with each other to determine who has designed and manufactured > the best-quality station. This competitiveness is found in DXing, > competitions and fox-hunts. > > -----OOOOO---- > > However, beware! A Ham Radio licence is such a > desirable thing to have that there are large > numbers of people who wish to be thought of > as Radio Hams when, in fact, they are nothing > of the kind! Usually such people are a > variation of the CB Radio hobbyist; they buy their > radios off the shelf and send them back to be > repaired; they are not interested in technical discussion > and sneer at those who are; they have no idea how > their radios work inside and have no wish to find out; > they are free with rather silly personal insults; > they have not satisfied any technical qualification > and their licences prevent the use of > self-designed-and-built equipment. > > These CB types engage in the competitive activities > with their Cheque-Book-purchased off-the-shelf radios > in a forlorn effort to prove that they are Radio Hams. > > No _REAL_ Radio Hams are deceived by such people! Article: 93776 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: <42e23902$1_3@x-privat.org> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Message-ID: Date: Sat, 23 Jul 2005 12:41:03 GMT "Polymath" wrote in message news:42e23902$1_3@x-privat.org... > My God, Airy Beannie has changed his name yet again! My kill list grows and grows. Get kicked off your previous ISP Beannie ? W4ZCB Article: 93777 of rec.radio.amateur.homebrew From: "Polymath" References: <42e163e0$1_1@x-privat.org> Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 13:41:36 +0100 Message-ID: <42e23ab6$1_1@x-privat.org> With good reason - because it isn't a troll. If your mental psyche presumes it to be, is that because "EI9GQ" is some form of Ireland CB issue? "Eamon Skelton" wrote in message news:pan.2005.07.23.01.12.58.912925@oceanfree.net... > On Fri, 22 Jul 2005 22:25:01 +0100, Polymath wrote: >> What is Ham Radio?........... > Barely a twitch on the Troll-O-Meter. > Yawn! > Ed. EI9GQ. Article: 93778 of rec.radio.amateur.homebrew From: "Polymath" References: <42e23902$1_3@x-privat.org> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sat, 23 Jul 2005 13:43:42 +0100 Message-ID: <42e23b3e$1_3@x-privat.org> In consideration of the rather silly Childish Broadcast (CB) quoted below, would it be correct to assume that "W4CZB" is some form of Yankland CB issue? Ham Radio has traditions of international friendliness which seem to be lost on you. "Harold E. Johnson" wrote in message news:zVqEe.174933$_o.95578@attbi_s71... > "Polymath" wrote in message > news:42e23902$1_3@x-privat.org... > My God, Airy Beannie has changed his name yet again! My kill list grows > and grows. Get kicked off your previous ISP Beannie ? > W4ZCB Article: 93779 of rec.radio.amateur.homebrew From: "Polymath" References: <42e163e0$1_1@x-privat.org> <42e22f6f$2_2@x-privat.org> <1122122858.373368.270640@o13g2000cwo.googlegroups.com> Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 13:50:05 +0100 Message-ID: <42e23cb1$1_1@x-privat.org> I am not discussing operators, I am discussing Radio Hams. Ham Radio is a technical pursuit. It is CB Radio that is concerned only with operating. wrote in message news:1122122858.373368.270640@o13g2000cwo.googlegroups.com... > Can't figure why an individual needs to qualify a group as diverse as > amateur radio operators in such a manner as this. Article: 93780 of rec.radio.amateur.homebrew From: "Mario Bros" References: <9ujP1eCaLh4CFwGU@ddwyer.demon.co.uk> Subject: Re: TCXO Clipped Sine Wave Message-ID: Date: Sat, 23 Jul 2005 12:51:24 GMT Hi Doug, A lot interesting. Thanks for the ulterior contribution. In these days I will make some test in order to try the better solution. 73's de IK6GQC Rocco "doug dwyer" ha scritto nel messaggio news:9ujP1eCaLh4CFwGU@ddwyer.demon.co.uk... > In message , Mario Bros > writes >>Hi folks, >>I would have to ask a clarification regard to the TCXO. >>They are found with output TTL, HCMOS and CLIPPED SINE WAVE. >>It is just with respect to this last type that I would want to have >>elucidations on when it is convenient to employ it, which the advantages >>and >>the disadvantages and which the extension of spectral harmonicas. >>In synthesis, from the plan point of view, which are the motivations that >>they make to incline towards a Clipped oscillator? >> >>Anticipated thanks. >> >>73's de IK6GQC Rocco >> >> > A further note the ssb noise will depend on the crystal Q the noise level > in the compensation circuit and the level of crystal oscillation. > Best with no compensation circuit ie XO or OCXO > The smallest crystals cannot be driven as hard as the bigger ones so dont > go for the smallest case! > The easiest way to indicate ssb noise may be to beat two identical > oscillators together with a few HZ offset. > Or lock one to the other using the voltage control line (exclusive or is > the easiest PLL circuit?) > The display the lock voltage on a scope. > > > -- > dd Article: 93781 of rec.radio.amateur.homebrew From: Spike Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 13:51:56 +0100 Message-ID: References: <42e163e0$1_1@x-privat.org> <42e1e736$0$351$cc9e4d1f@news.dial.pipex.com> Mark wrote: >FFS, killfile the twat- its only because of you idiots taking his bait I can >see his posts. > >Mark > That's in effect what I said, but I got b*ll*cked by some foreigner.. from Aero Spike Article: 93782 of rec.radio.amateur.homebrew From: zzzpk_pkearn_class_a@its-as-easy-as-they-say-multi_band_cb_is_here.eircom.es.it.net (ZZZZPK ) Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 13:04:41 GMT Message-ID: <42e24056.3044985@news.iol.ie> References: <42e163e0$1_1@x-privat.org> <42e1e736$0$351$cc9e4d1f@news.dial.pipex.com> Spike wrote: : Mark wrote: : : >FFS, killfile the twat- its only because of you idiots taking his bait I can : >see his posts. : > : >Mark : > : : That's in effect what I said, but I got b*ll*cked by some foreigner.. en Francais oder auf Englisch ? Article: 93783 of rec.radio.amateur.homebrew From: "Heytubeguy" Subject: FA:Heath: SQ-1, SG-7 (not SG-1),VY Nice Message-ID: Date: Sat, 23 Jul 2005 13:31:26 GMT Two Heathkit test instruments: tubes checked/replaced, old tubular caps/electrolytics replaced, guaranteed not DOA: NOTE: SG-7 IS MISLABELED IN TITLE AS SG-1: See at: http://search.ebay.com/_W0QQfgtpZ1QQfrppZ25QQsassZheytubeguy ALSO TAKE A LOOK AT THE McMURDO SILVER 5C!!, TNX 73 heytubeguy Article: 93784 of rec.radio.amateur.homebrew From: "Tom Donaly" Subject: Re: A F.A.Q. for Ham Radio References: <42e163e0$1_1@x-privat.org> Message-ID: <5dsEe.20546$NU2.2508@newssvr13.news.prodigy.com> Date: Sat, 23 Jul 2005 14:10:09 GMT Spike wrote: > Tom Donaly wrote: > > >>Spike wrote: >> >>>Tom Donaly wrote: >>> >>> >>> >>>>Another day, another wretched, little troll from another >>>>mediocre mind so filled with the desire to be recognized it has to >>>>argue phantasms so people will notice. As has commonly been said, >>>>it's more to be pitied than scorned. >>> >>> >>>Quite. But there's no need to repost the whole bloody thing. >>> >>>from >>>Aero Spike >> >>Ah, a fine example of childish, British pique. How superior of you. >>I'll tell you what, m'boy. From now on, I'll send all my posts to >>you before I post them so you can rewrite them to your satisfaction. >>Ha, ha! I've never read a more stereotypical post. >>73, >>Tom Donaly, KA6RUH > > > Technically speaking, your post was at best impolite. There are plenty > of people who have killfiled the OP, and your thoughtless action > resulted in their KFs being bypassed. There are also plenty of people > on dialup, who may have already downloaded the OP's rubbish, and don't > want to pay again to download yet another copy. And, by the way, I > suggest you put further posts where the sun doesn't shine. > > > from > Aero Spike Struck a nerve, did I? Well, you'll recover, eventually. 73, Tom Donaly, KA6RUH Article: 93785 of rec.radio.amateur.homebrew From: microwaves@blueyonder.co.uk (Peter) Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Message-ID: <42e355e5.1526024@news.blueyonder.co.uk> References: <42e23902$1_3@x-privat.org> Date: Sat, 23 Jul 2005 14:50:41 GMT On Sat, 23 Jul 2005 12:41:03 GMT, "Harold E. Johnson" wrote: > >"Polymath" wrote in message >news:42e23902$1_3@x-privat.org... >> >My God, Airy Beannie has changed his name yet again! My kill list grows and >grows. Get kicked off your previous ISP Beannie ? ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > >W4ZCB A number of us did complain to his ISP but only one had some success. In reality he was arrested by his local police for harassing another newsgroup reader over here in the UK. Apparently he resisted arrest to some extent and had the bruises to prove it! Full coverage appeared in his local newspaper. It was also understood that the police took away his computer(s). It seems like he got them back or had another stashed under the house :-) After several months he's now reappeared under another pseudonym and is churning out the same old stuff he did as Airey/Airy Bean. Everyone over here knows he is G4SDW so why he can't sign with his callsign, like many of us do, is a mystery to me! He is NOT a troll. Everything he posts he seriously believes in. Draw your own conclusions! One day I hope to meet him! I have two good photos of him, one taken at a UK amateur radio radio rally (= US "Hamfest") and the other outside his house when he was taken off to the cop shop! I expect his reply to my post will be his F6 macro key: "Grow up! You behave like a 5 year old" ... Polymath is killfiled from this weekend on! Peter, G3PHO Article: 93786 of rec.radio.amateur.homebrew From: "Tom Donaly" Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ References: <42e23902$1_3@x-privat.org> <42e355e5.1526024@news.blueyonder.co.uk> Message-ID: <9ktEe.6160$_%4.2014@newssvr14.news.prodigy.com> Date: Sat, 23 Jul 2005 15:25:57 GMT Peter wrote: > On Sat, 23 Jul 2005 12:41:03 GMT, "Harold E. Johnson" > wrote: > > >>"Polymath" wrote in message >>news:42e23902$1_3@x-privat.org... >> >>My God, Airy Beannie has changed his name yet again! My kill list grows and >>grows. Get kicked off your previous ISP Beannie ? > > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > >>W4ZCB > > > A number of us did complain to his ISP but only one had some success. > > In reality he was arrested by his local police for harassing another > newsgroup reader over here in the UK. Apparently he resisted arrest to > some extent and had the bruises to prove it! Full coverage appeared > in his local newspaper. It was also understood that the police took > away his computer(s). It seems like he got them back or had another > stashed under the house :-) > > After several months he's now reappeared under another pseudonym and > is churning out the same old stuff he did as Airey/Airy Bean. Everyone > over here knows he is G4SDW so why he can't sign with his callsign, > like many of us do, is a mystery to me! > > He is NOT a troll. Everything he posts he seriously believes in. Draw > your own conclusions! > > One day I hope to meet him! I have two good photos of him, one taken > at a UK amateur radio radio rally (= US "Hamfest") and the other > outside his house when he was taken off to the cop shop! > > I expect his reply to my post will be his F6 macro key: "Grow up! You > behave like a 5 year old" ... > > Polymath is killfiled from this weekend on! > > Peter, G3PHO Notoriety must be habit forming. If he had any originality, he'd be interesting. He reminds me of Samuel Johnson's friend who had only one idea in his head, and that a wrong one. 73, Tom Donaly, KA6RUH Article: 93787 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: Anderson 'Powerpole' Connectors Date: Sat, 23 Jul 2005 12:01:46 -0400 Message-ID: References: <11dvqf4eqouejcd@corp.supernews.com> <11e2fmamjkttk99@corp.supernews.com> In article <11e2fmamjkttk99@corp.supernews.com>, dplatt@radagast.org (Dave Platt) wrote: > Are those the old-style stamped-metal round Molex pins, such as one > finds in a PC power supply cable, or are they using the flat-metal > "OEM T" connector used by a lot of the radio manufacturers these days? > I can't tell from the picture in the IC-22 manual I downloaded. Dave- They are the old-style stamped-metal round Molex pins. These may be a smaller size than the ones used for PC power supplies, so current rating would be less. 73, Fred, K4DII Article: 93788 of rec.radio.amateur.homebrew From: fmmck@aol.com (Fred McKenzie) Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sat, 23 Jul 2005 12:34:54 -0400 Message-ID: References: <42e23902$1_3@x-privat.org> <42e23b3e$1_3@x-privat.org> In article <42e23b3e$1_3@x-privat.org>, "Polymath" wrote: > Ham Radio has traditions of international friendliness which seem > to be lost on you. Polymath- Perhaps Harold knows something that would justify his statement. I notice that you use a nickname, don't list a Ham call and hide your address. You wouldn't be one of those trolls I've heard about, would you? For myself, I object to your fake "FAQ". It is a statement of bigotry in disguise, and very few of us can meet your criteria. You insult any of us who care to enjoy the social and other aspects of Ham Radio, in spite of your "friendliness" reference. Get a life. 73, Fred, K4DII Article: 93789 of rec.radio.amateur.homebrew From: Spike Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 17:36:31 +0100 Message-ID: <29s4e1p183r9hev68sl40d0qilfsik9geh@4ax.com> References: <42e163e0$1_1@x-privat.org> <5dsEe.20546$NU2.2508@newssvr13.news.prodigy.com> Tom Donaly wrote: > >Struck a nerve, did I? Well, you'll recover, eventually. >73, >Tom Donaly, KA6RUH I see that your skill in the trimming of posts is currently enjoying deferred success; and seems likely to remain so. from Aero Spike Article: 93790 of rec.radio.amateur.homebrew From: "Harold E. Johnson" References: <42e23902$1_3@x-privat.org> <42e355e5.1526024@news.blueyonder.co.uk> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Message-ID: Date: Sat, 23 Jul 2005 17:04:48 GMT > After several months he's now reappeared under another pseudonym and > is churning out the same old stuff he did as Airey/Airy Bean. Everyone > over here knows he is G4SDW so why he can't sign with his callsign, > like many of us do, is a mystery to me! > > He is NOT a troll. Everything he posts he seriously believes in. Draw > your own conclusions! Hi Peter, good to hear from you, and thanks for the update. I instantly knew who it was, same garbage, same source. I have difficulty with your last however, surely no one is stupid enough to believe ANYTHING he spouts off with. Please don't forward the picture, my stomach is upset enough already. Regards W4ZCB Article: 93791 of rec.radio.amateur.homebrew From: "Polymath" References: <42e23902$1_3@x-privat.org> <42e355e5.1526024@news.blueyonder.co.uk> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sat, 23 Jul 2005 18:04:52 +0100 Message-ID: <42e278fa$1_1@x-privat.org> You continue to behave like a 5-year-old, especially in respect of the lies that you tell below. 1, The harassment was _ALLEGED_ in _TWO_ malicious and deliberately misleading perjurous statements made by Brian Reay G8OSN on the 7th and 21st Feb. 2. No-one had any success in their complaints to my ISP. All complaints were discussed with me. All anonymous complaints were ignored. All complaints >from those who had a history of childish outbursts directed at me, such as you, were ignored. 3. I did not resist arrest. I now have the video of the arrest to prove this. 4. When there are a large number of dangerous paranoid loonies such as yourself on Usenet, everybody is advised to remain anonymous, 5. You have no photograph of me at a rally. The photo you do have was not taken when I was arrested, but when I contacted the local paper. 6. I do not have an "F6 Macro Key", whatever that may be. 7. If you wish to killfile me that is no problem. My remarks on Usenet are not directed to the closed mind or the brain-dead mind. "Peter" wrote in message news:42e355e5.1526024@news.blueyonder.co.uk... > On Sat, 23 Jul 2005 12:41:03 GMT, "Harold E. Johnson" > wrote: >>"Polymath" wrote in message >>news:42e23902$1_3@x-privat.org... >>My God, Airy Beannie has changed his name yet again! My kill list grows >>and >>grows. Get kicked off your previous ISP Beannie ? > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >>W4ZCB > A number of us did complain to his ISP but only one had some success. > In reality he was arrested by his local police for harassing another > newsgroup reader over here in the UK. Apparently he resisted arrest to > some extent and had the bruises to prove it! Full coverage appeared > in his local newspaper. It was also understood that the police took > away his computer(s). It seems like he got them back or had another > stashed under the house :-) > After several months he's now reappeared under another pseudonym and > is churning out the same old stuff he did as Airey/Airy Bean. Everyone > over here knows he is G4SDW so why he can't sign with his callsign, > like many of us do, is a mystery to me! > He is NOT a troll. Everything he posts he seriously believes in. Draw > your own conclusions! > One day I hope to meet him! I have two good photos of him, one taken > at a UK amateur radio radio rally (= US "Hamfest") and the other > outside his house when he was taken off to the cop shop! > I expect his reply to my post will be his F6 macro key: "Grow up! You > behave like a 5 year old" ... > Polymath is killfiled from this weekend on! Article: 93792 of rec.radio.amateur.homebrew From: "Polymath" References: <42e23902$1_3@x-privat.org> <42e23b3e$1_3@x-privat.org> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sat, 23 Jul 2005 18:07:16 +0100 Message-ID: <42e278fb_1@x-privat.org> You have your opinion, I have mine. I do not need to impart childish insults as you do below merely because you hold a different opinion. That is the difference between _REAL_ Radio Hams and others. The FAQ is not fake. It is a question that is asked and answered frequently by this posting. "Fred McKenzie" wrote in message news:fmmck-2307051234540001@aca32bf9.ipt.aol.com... > In article <42e23b3e$1_3@x-privat.org>, "Polymath" > wrote: > >> Ham Radio has traditions of international friendliness which seem >> to be lost on you. > > Polymath- > > Perhaps Harold knows something that would justify his statement. I notice > that you use a nickname, don't list a Ham call and hide your address. You > wouldn't be one of those trolls I've heard about, would you? > > For myself, I object to your fake "FAQ". It is a statement of bigotry in > disguise, and very few of us can meet your criteria. You insult any of us > who care to enjoy the social and other aspects of Ham Radio, in spite of > your "friendliness" reference. > > Get a life. > > 73, Fred, K4DII Article: 93793 of rec.radio.amateur.homebrew From: Spike Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 18:50:18 +0100 Message-ID: References: <42e163e0$1_1@x-privat.org> <5dsEe.20546$NU2.2508@newssvr13.news.prodigy.com> <29s4e1p183r9hev68sl40d0qilfsik9geh@4ax.com> Tom Donaly wrote: > Who knows, you may even >get up enough courage, some day, to overcome your sick aversion >to posting your real name and call sign at the end of your posts. >After that, the sky's the limit. You could even, in the distant >future, conquer your culture-bound, xenophobic, insular proclivities >enough to have a civil conversation with someone who lives beyond >Albion's confining shores. There is always hope. I think you must be addressing the OP, one Poly Unsaturated Fat. from Aero Spike Article: 93794 of rec.radio.amateur.homebrew From: "Polymath" References: <6294-42D94D12-102@storefull-3255.bay.webtv.net> <42DA3D21.4080306@bloomer.net> <42da3e51$1_2@x-privat.org> <1121725307.731291@r2d2.vermontel.net> Subject: Re: build a variable capacitor Date: Sat, 23 Jul 2005 19:31:10 +0100 Message-ID: <42e28c9f$1_3@x-privat.org> In a differential capacitor, as the rotor disengages from one set of fixed plates, it engages with the other set, instead of engaging with fresh air. The two sets of fixed plates are adjacent to each other and separated by a gap. (If it were not for the gap, there would be a solid square of metal with the axle dead centre) "Mike, K8LH" wrote in message news:lImdnWOwMq6y4H_fRVn-tg@wideopenwest.com... >> > RG, is there an example of a differential capacitor I could look at? I'm > not sure I've ever seen one? Is there a Tuner project somewhere using one > I could look at (grin)... Article: 93795 of rec.radio.amateur.homebrew From: Nedlar > Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 21:31:53 +0100 Message-ID: References: <42e163e0$1_1@x-privat.org> <5dsEe.20546$NU2.2508@newssvr13.news.prodigy.com> <29s4e1p183r9hev68sl40d0qilfsik9geh@4ax.com> On Sat, 23 Jul 2005 17:18:02 GMT, "Tom Donaly" wrote: >As I said, you'll recover, eventually. Who knows, you may even >get up enough courage, some day, to overcome your sick aversion >to posting your real name and call sign at the end of your posts. >After that, the sky's the limit. You could even, in the distant >future, conquer your culture-bound, xenophobic, insular proclivities >enough to have a civil conversation with someone who lives beyond >Albion's confining shores. There is always hope. >73, >Tom Donaly, KA6RUH Tom, you have just met the UKRA resident coward. Here's one of his posts when he posting as RVMJ... > On Sat, 28 Feb 2004 14:04:36 +0000, RVMJ 99g wrote: > > >Having been assaulted by two 'young people' in the garage at the back > >of my house, during which (being aware of the issues) I neither > >reacted or retaliated, I count myself lucky that they didn't concoct a > >story about the reverse being true. There were were no independent > >witnesses, and so their uncorroborated word as 'young people' would > >have been accepted without question, as is the normal practice. > > > >As they never surfaced before 10:30 on weekend mornings, I made sure > >that any outside work I wanted to do, such as car servicing or > >gardening, was done before that time, at which point I made myself > >scarce. Taking leave and doing jobs during the week wasn't on, as one > >couldn't guarantee that they wouldn't bunk off from school. > > > >As they used to congregate in the area of the garages, it meant I > >could never use my motorcycle without risking being accosted by them > >on my return, as there was no way of seeing if they were present. So > >for a year or two, until they discovered the world outside the area > >contained people of the opposite gender, I was a prisoner in my own > >house. Again, I count myself lucky that they only scratched my car > >four times, broke five radio aerials and two door mirrors, rendered > >the door-locks inoperative with matchsticks and slashed the tyres > >once. Young people need protection, did you say? Article: 93796 of rec.radio.amateur.homebrew From: Nedlar > Subject: Re: A F.A.Q. for Ham Radio Date: Sat, 23 Jul 2005 21:33:43 +0100 Message-ID: <3ba5e1hovv3gtlerifioi7nkg4bubh2u3p@4ax.com> References: <42e163e0$1_1@x-privat.org> <42e1e736$0$351$cc9e4d1f@news.dial.pipex.com> On Sat, 23 Jul 2005 13:51:56 +0100, Spike wrote: > >That's in effect what I said, but I got b*ll*cked by some foreigner.. > >from >Aero Spike I don't think it's possible for someone with no balls to get a bollocking. Article: 93797 of rec.radio.amateur.homebrew From: Gary Cavie Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sat, 23 Jul 2005 21:43:25 +0100 Message-ID: References: <42e23902$1_3@x-privat.org> <42e23b3e$1_3@x-privat.org> In article <42e23b3e$1_3@x-privat.org>, invalid@invalid.invalid says... > In consideration of the rather silly Childish Broadcast (CB) > quoted below, would it be correct to assume that "W4CZB" is > some form of Yankland CB issue? > > Ham Radio has traditions of international friendliness which seem > to be lost on you. > You don't know Harold very well then? Article: 93798 of rec.radio.amateur.homebrew From: kwacka Subject: Re: A F.A.Q. for Ham Radio Date: Sun, 24 Jul 2005 00:29:37 +0200 Message-ID: <74h5e1h72c02jvjntgdvjtmell9eupec5h@4ax.com> References: <42e163e0$1_1@x-privat.org> On Fri, 22 Jul 2005 22:35:05 GMT, "Tom Donaly" wrote: >Polymath wrote: >> What is Ham Radio? > >Another day, another wretched, little troll from another >mediocre mind so filled with the desire to be recognized I hesitate (for about 0,25 seconds) to poit out that he has been recognised. Article: 93799 of rec.radio.amateur.homebrew Message-ID: <42E2CCE8.114A67FF@jake.net> From: jake Subject: Re: Anderson 'Powerpole' Connectors References: <11e3hilskrvc579@corp.supernews.com> Date: Sat, 23 Jul 2005 23:04:11 GMT The powerpole connector system is in use worldwide ! Take a trip to any home depot, sams, costco or lumber yard. The electric battery operated lift equipment all use the large powerpole connectors (36volt 600ah wetcells) They only go in one way, can't put them in backwards. We just have to watch what we are doing, Anderson can't do it for us. Just like at the firing range, you can load the wrong type of ammo in your pistol and have the round get stuck in the barrel and if fired again the firearm can break and hurt you and others around. What is to stop me from connecting the radio cables to my astron termainals backwards ? Be safe ! Article: 93800 of rec.radio.amateur.homebrew From: zzzpk_pkearn_class_a@its-as-easy-as-they-say-multi_band_cb_is_here.eircom.es.it.net (ZZZZPK ) Subject: Re: A F.A.Q. for Ham Radio Date: Sun, 24 Jul 2005 00:34:23 GMT Message-ID: <42e2e1ec.44416839@news.iol.ie> References: <42e163e0$1_1@x-privat.org> <5dsEe.20546$NU2.2508@newssvr13.news.prodigy.com> <29s4e1p183r9hev68sl40d0qilfsik9geh@4ax.com> "Tom Donaly" wrote: : Albion's confining shores. There is always hope. : 73, : Tom Donaly, KA6RUH hmmmmmm do you have irish roots ??? just your name "sounds" irish. Article: 93801 of rec.radio.amateur.homebrew From: "Tom Donaly" Subject: Re: A F.A.Q. for Ham Radio References: <42e163e0$1_1@x-privat.org> <5dsEe.20546$NU2.2508@newssvr13.news.prodigy.com> <29s4e1p183r9hev68sl40d0qilfsik9geh@4ax.com> <42e2e1ec.44416839@news.iol.ie> Message-ID: Date: Sun, 24 Jul 2005 01:23:26 GMT ZZZZPK wrote: > > > hmmmmmm do you have irish roots ??? > > just your name "sounds" irish. > I have a nineteenth century Irish great-gandfather, I believe. The rest is German, Welsh, Danish, etc. Typical American mix. 73, Tom Donaly, KA6RUH Article: 93802 of rec.radio.amateur.homebrew Date: Sun, 24 Jul 2005 16:25:54 +0800 From: Richard Hosking Subject: Reviving 12V Gel cells Message-ID: <42e35092$0$29458$5a62ac22@per-qv1-newsreader-01.iinet.net.au> Dear all I am sure this has been posted before, but I cant recall the response. I have several 12V gel cells out of UPS's which are dead. Apparently they can be revived by desulfating them - any ideas on the way to do this? Thanks Richard Article: 93803 of rec.radio.amateur.homebrew From: Jim Adney Subject: Re: Silver Mica vs Mica Caps Date: Sun, 24 Jul 2005 11:10:11 -0500 Message-ID: References: <23000$42db3af0$4232be43$20080@COQUI.NET> <5+nOxDDLYh4CFwnK@ddwyer.demon.co.uk> On Sat, 23 Jul 2005 11:03:55 +0100 doug dwyer wrote: >then a lower costt mica reconstituted >was employed all were silver evaporated. Was that "Microy?" - ----------------------------------------------- Jim Adney jadney@vwtype3.org Madison, WI 53711 USA ----------------------------------------------- Article: 93804 of rec.radio.amateur.homebrew From: "Polymath" References: <42e23902$1_3@x-privat.org> <42e355e5.1526024@news.blueyonder.co.uk> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sun, 24 Jul 2005 17:58:19 +0100 Message-ID: <42e3c85f$1_2@x-privat.org> Normally it is the victim who resorts to the killfile, but in this case you have clearly embarrassed yourself that you feel the need to hide behind a killfile after your tirade of insulting infantile comments in this and other threads. Stupid boy. "Peter" wrote in message news:42e355e5.1526024@news.blueyonder.co.uk... > Polymath is killfiled from this weekend on! > > Peter, G3PHO Article: 93805 of rec.radio.amateur.homebrew From: "deBaser" References: <42e23902$1_3@x-privat.org> <42e355e5.1526024@news.blueyonder.co.uk> <42e3c85f$1_2@x-privat.org> Subject: Re: Reposted due to thread hijacking by CBers....A Ham Radio FAQ Date: Sun, 24 Jul 2005 18:26:42 +0100 Message-ID: <1122225772.87165.0@doris.uk.clara.net> "Polymath" wrote in message news:42e3c85f$1_2@x-privat.org... > Normally it is the victim who resorts to the killfile, but in this > case you have clearly embarrassed yourself that you feel the need > to hide behind a killfile after your tirade of insulting infantile > comments in this and other threads. > > Stupid boy. > Bean, you are just repeating yourself. I think we have all heard enough times what you have to say and its a tad boring. I think its the killfile for you. deBaser Article: 93806 of rec.radio.amateur.homebrew From: Paul Keinanen Subject: Re: anyone know about kit modifation to CW rigs for RTTY or other digital modes Message-ID: References: <1122079369.854847.47250@g43g2000cwa.googlegroups.com> <11e3i41qkdkcje7@corp.supernews.com> Date: Sun, 24 Jul 2005 20:47:16 +0300 On Sat, 23 Jul 2005 04:33:05 -0000, dplatt@radagast.org (Dave Platt) wrote: >You might be able to do something similar to this with a >crystal-controlled QRP rig, but I suspect that pulling a crystal that >far with a varactor might be somewhat difficult. The RTTY offset is only 170 Hz, so the required detuning on 160 m would be about 100 ppm (parts per million), at 80 m 50 ppm, at 40 m 25 ppm and at 20 m 12 ppm. This should not be too hard for a VCXO, which usually can be pulled to several hundred ppm with only some spectral purity or stability problems. Shifts less than 100 ppm should not be too hard. Paul OH3LWR Article: 93807 of rec.radio.amateur.homebrew Message-ID: <42E42CA2.2884F2F9@outerspace.net> From: jerry Subject: Re: Reviving 12V Gel cells References: <42e35092$0$29458$5a62ac22@per-qv1-newsreader-01.iinet.net.au> Date: Mon, 25 Jul 2005 00:04:52 GMT Hello Richard, If they are 0 volts, recycle them, not worth the effort to try to bring them back. They may have an open cell overcharged or had a surge in the ups. Most hamfests have used batteries available with plenty of life left in them. We swap out our batteries after three years normal use in our small and large ups systems (data center). Not all sealed lead acid batteries are gel cells. GelCell was a trademark of Johnson Controls and my still be so. Any other sla type is absorbed electrolyte or paste. There is the absorbed glass mat, fiberglass keeps the electrolyte close to the plates. Richard wrote: > Dear all > > I am sure this has been posted before, but I cant recall the response. > I have several 12V gel cells out of UPS's which are dead. > Apparently they can be revived by desulfating them - any ideas on the > way to do this? > > Thanks > Richard Article: 93808 of rec.radio.amateur.homebrew Subject: FS: Meters, and lots of them From: "Eugene Rippen" Date: Sun, 24 Jul 2005 17:32:46 -0700 Message-ID: <1122251713_299@spool6-east.superfeed.net> For sale about 640 meters. GE, Simpson, Triplett, Marion, Westinghouse, Weston, Western Electric, AND MANY MORE. BRANDS. They have been tested to see if the movement works. All I know about each meter is what is on the website. I believe they are all reasonably priced. They will be sold only through the website. Please! Only VISA, MC and PayPal. No checks, MOs or cash.. See at http://www.muchstuff.com Gene Rippen, WB6SZS ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-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 =---- Article: 93809 of rec.radio.amateur.homebrew Subject: FS: Lots of tubes. Hams, collectors? From: "Eugene Rippen" Date: Sun, 24 Jul 2005 19:18:00 -0700 Message-ID: <1122258027_385@spool6-east.superfeed.net> There are a lot of tubes for hams and for tube and radio collectors. Some sweep tubes too. They have been tested. Look for comments on each tube. If no comment, then tube tested good. All I know about each tube is what is on the website. I believe they are all reasonably priced. They will be sold only through the website. Please! Only VISA, MC and PayPal. No checks, MOs or cash.. See at http://www.muchstuff.com Gene Rippen, WB6SZS ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-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 =---- Article: 93810 of rec.radio.amateur.homebrew From: Dr. Anton T. Squeegee Subject: Re: Reviving 12V Gel cells Date: Mon, 25 Jul 2005 06:11:26 -0700 Message-ID: References: <42e35092$0$29458$5a62ac22@per-qv1-newsreader-01.iinet.net.au> In article <42e35092$0$29458$5a62ac22@per-qv1-newsreader- 01.iinet.net.au>, richardh@iinet.net.au says... > Dear all > > I am sure this has been posted before, but I cant recall the response. > I have several 12V gel cells out of UPS's which are dead. > Apparently they can be revived by desulfating them - any ideas on the > way to do this? Sealed lead-acid (not all are "gel" types) can SOMEtimes be revived. First and foremost: If the battery measures zero volts, don't even try. Recycle it. If it shows 10 or so volts, it may have developed a bad cell. Revival can be attempted, but don't expect miracles. The best possible method to revive any weak rechargeable battery is with an electronic battery conditioner, such as those made by Cadex or Christie. While very expensive if purchased 'new,' used ones often show up on Greed-Bay, or at ham swap meets. Such a device will often use a tightly-controlled 'pulse' charge/discharge method, which helps destroy things like sulfiting without damaging the battery in question. Happy hunting. -- Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute. (Known to some as Bruce Lane, ARS KC7GR, kyrrin (a/t) bluefeathertech[d=o=t]calm -- www.bluefeathertech.com "If Salvador Dali had owned a computer, would it have been equipped with surreal ports?" Article: 93811 of rec.radio.amateur.homebrew From: Joeseph Subject: Re: What would cause the SWR to go up drastically when I turn my amp on? Date: Mon, 25 Jul 2005 12:45:40 -0400 Message-ID: References: On Fri, 15 Jul 2005 19:12:06 +0000 (UTC), "Reg Edwards" wrote: >To think in terms of SWR readings is a waste of time and effort. > >You are all confusing yourselves. Furiously digging yourselves even >further into the mire. > >Go back to square one and begin again from Ohm's Law. >---- >Reg > Actually they are correct. I ran an experiment using a Barker and Williamson low pass filter with a 32 MHz cutoff. With the set-up below the SWR went high when the amp was turned on. RADIO===>AMP===>SWR METER====>ANTENNA With the set-up below the SWR stayed at 1.1:1 with and without the amp on. RADIO===>AMP===>LOW PASS FILTER===>SWR METER===>ANTENNA Also the output of the amp showed about 110 watts without the low pass filter, but with the low pass filter the watt meter installed after the low pass filter showed about 75 watts. That means about 30 watts was being transmitted above 30 MHz even through the fundamental was at 28 MHz. I doubled the value of the capacitors going form the collector to ground, and the SWR dropped to 1.5:1 with the amp on and 1.1:1 with the amp off. Then I add 470 pf capacitors from the trasnsitor base to ground and the SWR with the amp dropped to 1.3:1 with the amp on. With the TVI filter in-line the SWR is 1.1:1 with and without the amp on. A lack of working space inside the amp case made it difficult to install a pi-network on the input and output side of the transistor finals. Thanks for everyone's help. The SWR increased was caused by harmonics above the fundamental frequency, and they were outside the bandwidth of the antenna. Article: 93812 of rec.radio.amateur.homebrew From: "Pete KE9OA" References: <1122315009.889610.131090@g14g2000cwa.googlegroups.com> Subject: Re: BF0 Circuit Message-ID: Date: Mon, 25 Jul 2005 20:06:09 GMT E-mail me directly and I will send you a schematic of an NE602 based detector circuit in PDF form. Pete wrote in message news:1122315009.889610.131090@g14g2000cwa.googlegroups.com... > Hi Group, > > I am looking at moving the old CB up to 10meter CW/SSB, One thing I > have never seen is the addition of a BFO circuit to copy SSB and CW. > > The radio has a first IF of 10.695 MHz and the next one is 455KHz. > > I believe that 455KHz is the place to add the BFO and I think that the > 455KHz IF must be mixed with another frequency, say either +/- 1KHz to > get the sidetone. > > I don't know if this would work for SSB reception? > > How about Double-side band modulation, it would have both LSB and USB > but at least it would be interesting to experiment with. > > If you know of a circuit or article, please post. > > I look forward to your posting. > > Paul > KJ4UO > EM60 > Article: 93813 of rec.radio.amateur.homebrew From: "Pete KE9OA" References: <1121964889.026445.297930@z14g2000cwz.googlegroups.com> Subject: Re: want to build 30m xtal lsb rcvr Message-ID: Date: Mon, 25 Jul 2005 20:10:04 GMT That is about as cheap as you are going to find, unless you want to design it yourself. Pete wrote in message news:1121964889.026445.297930@z14g2000cwz.googlegroups.com... > I'm looking to buy in kit form (or prebuilt if it's cheap enough) a > receiver whose sole purpose in life would be to sit on 10.151 LSB and > decode APRS packets to be relayed into APRS-IS on the internet via a > computer with a sound card. I've been looking around and I've found > the 30 meter half watt Rock-Mite CW tranceiver from Small Wonder Labs > for $27 including shipping, $39.50 with the connectors. I'd imagine > this would work just fine if I swapped the crystal in it to 10.148.5 > or so, but I really don't need the transmit option, unless there was > some way to modify it to take the sound card output from my computer > and transmit 300 baud packet with it. It looks like since you can > choose two frequencies 1khz from each other, that maybe it would be > able to be modified to transmit the frequencies for mark and space and > perhaps be switched by some sort of FSK mechanism controlled by a > serial port. Anyways, that's more than I think I want to get into with > this project and would be happy if somewhere out there was an easy > crystal controlled kit that will just receive one 30 meter frequency in > lower side band. > > Thanks > Article: 93814 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Unknown Component Date: Mon, 25 Jul 2005 15:00:03 -0500 Message-ID: References: <6295-42D9535C-23@storefull-3255.bay.webtv.net> "Win" wrote in message news:g26ld1l2op9bb63k5fjhmatfafvkmnasur@4ax.com... > On Sat, 16 Jul 2005 13:35:08 -0500, inagaddadavida@webtv.net (Jim) > wrote: > > >i am not highly qualified as an electronics guy so maybe this is stupid, > >but isnt that a cap to reduce the spark as the contacts open? an old > >points ignition condenser is for that purpose and it is .02 mfd > > Maybe you are more qualified than youy think. Yes, it is a MilSpec > cap, probably for that exact purpose. > > Win, W0LZl drifting OT. Actually, the Point condenser formed a resonant circuit with the coil to produce a much larger kick and resulting spark. 73, Steve, (kDCI Article: 93815 of rec.radio.amateur.homebrew From: "Steve Nosko" Subject: Re: Anderson 'Powerpole' Connectors - Two SOLUTIONS... Date: Mon, 25 Jul 2005 15:21:42 -0500 Message-ID: References: <11e3hilskrvc579@corp.supernews.com> <42E2CCE8.114A67FF@jake.net> Roll pin problem: I use the smallest plastic tye-wrap instead of the roll-pin. Looking at it, I reasoned the roll pin was a bad solution because of the way it stresses the wedge side-mate structure. I use the standard Power Pole configuration (for the battery charge option and commonality with everyone) and put the "head" of the tye-wrap so it is on the "top" when viewed from the "red-on-the-right" standard view. Pull the tye-wrap through all the way, so the head is up against the Andersons, then bend the rest around, to the rear between the two wires and tighten (not too tight or it will also tend to spread the two Andersons). I crease (fold and squeeze with pliers) the tye-wrap so it is "square" at the bend points. This way the two mating tye-wrap "heads" are on opposite sides (for a blind ham in the area) to mate by feel. Offset bad-mate problem: One solution to the "offset connection" problem is to add an empty body on the outside on each side, then fill it with epoxy. This'll prevent mating red to black. Perhaps one of you enterprising fellas will approach Anderson with a proposal to manufacture such a blank. It doesn't need to be full size, just enough to block the offset mate. It only needs the wedge side-mat and a front end in the shape of an "L". If it has a small hole in the front, it could also be used to chassis mount the pairs. 73, Steve, K9DCI Article: 93816 of rec.radio.amateur.homebrew From: Rex Subject: Re: Anderson 'Powerpole' Connectors Message-ID: References: Date: Mon, 25 Jul 2005 21:45:52 GMT On Sat, 23 Jul 2005 00:36:50 GMT, "RadioGuy" wrote: >I have concluded there is no way the 'PowerPole' connectors can be >configured to prevent a short-circuit as the connectors are presently >designed. If you put the paired powerpole connector inside of a housing, they can't be plugged wrong because the housing will hit the misaligned connector before the other one goes in. I've made things like this in my own setup, but I don't know of anyplace to buy such a thing. This would certainly be an easier-to-accomplish and more rational solution than redesigning the connectors. --- As an aside, here's a story of another thing that can go wrong. In a roving contest a few years back, I was driving down a narrow two lane road with no sholder when my van started filling with smoke. Bad enough that I had to roll down the window to see. I lucked out and found a driveway entrance to stop in. Turns out, much of the wiring to my mobile rigs in the back had burned up. The reason was that a cable with a bnc connector had bounced in driving and landed on the + terminal of my battery. I had fuses and CBs in the system but not on the ground side. This problem connected much of the ground wiring directly accross the battery. So the lesson is, be sure your battery posts are shielded from anything that could fall on them. Article: 93817 of rec.radio.amateur.homebrew From: "Heriberto" References: <1122315009.889610.131090@g14g2000cwa.googlegroups.com> Subject: Re: BF0 Circuit Date: Mon, 25 Jul 2005 19:56:18 -0300 Message-ID: <42e56b85_1@x-privat.org> Hi Paul: For better help, I whises known your detector in actual rig.- It is transistor o valve? The BFO can be a oscilator within IF coil in clapp or hartley layout.- REgards Heriberto escribió en el mensaje news:1122315009.889610.131090@g14g2000cwa.googlegroups.com... > Hi Group, > > I am looking at moving the old CB up to 10meter CW/SSB, One thing I > have never seen is the addition of a BFO circuit to copy SSB and CW. > > The radio has a first IF of 10.695 MHz and the next one is 455KHz. > > I believe that 455KHz is the place to add the BFO and I think that the > 455KHz IF must be mixed with another frequency, say either +/- 1KHz to > get the sidetone. > > I don't know if this would work for SSB reception? > > How about Double-side band modulation, it would have both LSB and USB > but at least it would be interesting to experiment with. > > If you know of a circuit or article, please post. > > I look forward to your posting. > > Paul > KJ4UO > EM60 > Article: 93818 of rec.radio.amateur.homebrew From: "Ralph Mowery" References: <1122315009.889610.131090@g14g2000cwa.googlegroups.com> Subject: Re: BF0 Circuit Message-ID: Date: Mon, 25 Jul 2005 23:41:06 GMT wrote in message news:1122315009.889610.131090@g14g2000cwa.googlegroups.com... > Hi Group, > > I am looking at moving the old CB up to 10meter CW/SSB, One thing I > have never seen is the addition of a BFO circuit to copy SSB and CW. > > The radio has a first IF of 10.695 MHz and the next one is 455KHz. > > I believe that 455KHz is the place to add the BFO and I think that the > 455KHz IF must be mixed with another frequency, say either +/- 1KHz to > get the sidetone. > > I don't know if this would work for SSB reception? YOu can build a BFO for either one of three frequencies. 1. Near the input signal 2. Near 455 khz 3. near 10.695 It will almost have to be variatable as the CB rig will be crystal controled and unless it has a fine tuning control (most of the AM units did not ). Article: 93819 of rec.radio.amateur.homebrew From: Jim Adney Subject: Re: Reviving 12V Gel cells Date: Mon, 25 Jul 2005 21:06:47 -0500 Message-ID: References: <42e35092$0$29458$5a62ac22@per-qv1-newsreader-01.iinet.net.au> <4KudnYWJFdnr_n7fRVnytQ@pipex.net> On Sun, 24 Jul 2005 10:46:35 +0100 "Highland Ham" wrote: >> I am sure this has been posted before, but I cant recall the response. >> I have several 12V gel cells out of UPS's which are dead. >> Apparently they can be revived by desulfating them - any ideas on the way >> to do this? >Apply briefly a high current to break the sulfate by charging a high >capacity electrolytic capacitor (>10000microFarad) to say 40 -50 V ( or even >higher) and discharge via battery. That's the "trick" for possibly fixing a shorted NiCad, but it won't fix a sulfated lead acid cell. Sulfated cells can only be recharged extremely slowly. They will exhibit a high cell voltage while doing this, but trying to charge them faster with higher current will only electrolyze the water in them and damage the plates. >The reason for having a 'dead' sealed battery can also be that the battery >has been overcharged resulting in lack of electrolyte. Absolutely right! There's no way to charge a lead acid battery that is dry. You can add water to some, but some are so well sealed that you have to destroy them to get in there. >Some people have been successful to 'revive' an electrolyte starved battery >by getting access to the rubber vent caps ,removing these temporarily and >injecting a minor amount of distilled or de-ionised water with a syringe. > >A sealed battery is NOT necessarily a 'gel' type. Right, but you can tell a lot by the voltage across the cell while it's trickle charging. Gel cells, starved lead acid cells, and regular lead acid cells all share the same chemistry and will show 2-2.4 volts per cell, NiCads and NiMH are 1.2-1.4V, and Lithium cells run about 3V. Of course none of this works if the cell is dry. A LOT of these die just by drying out. Injecting a bit of water is a good idea if you can get in there. - ----------------------------------------------- Jim Adney jadney@vwtype3.org Madison, WI 53711 USA -----------------------------------------------