[AMRadio] Re: FREE! 400 Cycle MG set
Got it working. Offer still holds. Dennis D. W7QHO Glendale, CA
[AMRadio] Relayed from N4TGC was: GB VTVM Battery Eliminator
Relayed from N4TGC Eric Don; It's so simple I could almost recall it from memory, but I pulled the schematic anyway ... there are a couple-three detriments, which I'll mention first: the circuit I use only works if the negative of the cell is grounded (which all Heaths, EICOs and Conars I've ever encountered were); it puts a slight additional load on the filament winding (tho I've had no overheating or failures); and the unit has to be re-calibrated, as the voltage may be off by 0.1v from that of a C cell. Remove the dead battery. Next, (diagram this before you do it) install a 3-terminal tie strip that has one grounded terminal, in a convenient spot. From one floating terminal, run a wire to the + of the cell holder. Wire two ordinary silicon diodes in series (one cathode to ground) from there to ground - this is the regulator. (I use 200v 1/2a or better, but around 50v, 25ma should work fine.) From this same 'floating' point, run a 47 ohm, 1/4 watt resistor to the other floating terminal; from there, put a 470u/16v cap. to ground (observe polarity!) From the junction of cap. and res., put the cathode (banded end) of a third diode, whose anode ties to the un-grounded side of the 6.3vac filament sply. Fire it off, re-calibrate, and you're done - 'forever'. What's so maddening about the original design is that not only does 'everyone' forget and leave the C cell in place, but the idiots at Heath put it ON TOP, where it could leak and ruin the guts! Yet, I've found several that destroyed the holder, but none so far that got down into the other circuitry. Am I lucky, or what?! I've built this circuit seven or eight times so far - only the first one gave trouble, and then only because I used three diodes in the regulator string, as the source was indeterminate as to the number needed - I think they assumed one might be using 'geranium' diodes, which are no longer common. (Silicons have a rigid 0.7v junction; germaniums around 0.4, hence their uncertainty.) Have fun!e -Original Message- From: [EMAIL PROTECTED] To: amradio@mailman.qth.net; [EMAIL PROTECTED] Sent: Thu, 20 Jul 2006 12:26 PM Subject: GB VTVM Battery Eliminator Has anyone does this with a circuit that they are happy with? I'd like to do this to one or more of my VTVMs but I don't want to experiment with it--I want an optimal circuit that will be reliable. Anybody got one? 73, Don Merz, N3RHT
[AMRadio] Low-pass filter for 6m
Anyone have a low-pass filter suitable for 6m operation they could part with? I worry that my homebrew 100-watt 6m amp might need a safety net... Steve WD8DAS
[AMRadio] Don Merz Changing e-Mails
As some of you know, my employer has decided that my job and the jobs of my entire department can best be done in India. We have spent the last 2 months training the Indians and the game is up. The upshot is that I am leaving this e-mail address and you will now find me under [EMAIL PROTECTED] I will still be here--you can't get rid of me as easy as they did. 73, Don Merz, N3RHT The information contained in this e-mail may be confidential and is intended solely for the use of the named addressee. Access, copying or re-use of the e-mail or any information contained therein by any other person is not authorized. If you are not the intended recipient please notify us immediately by returning the e-mail to the originator.(16b)
Re: [AMRadio] Low-pass filter for 6m
At least 3 back issues of QST and 1 Ham Radio Mag had construction articles on building 6 meter TVI filters. Older Radio Amateur Handbooks also had 6 meter filter construction articles. CQ Mag also had several articles on 6 meter filter construction. Personally, I would build the amp, use it, and then see if you have a TVI problem. I live in a residential area, neighbors all around me, Channel 2 from NY active and I run 500 watts on 6M. No TVI complaints. I actually had TVI complaints when I first put up the tower before I installed the antennas. Today, I get more complaints when I operate high power on 75M AM. Pete, wa2cwa On Fri, 21 Jul 2006 10:22:17 EDT [EMAIL PROTECTED] writes: Anyone have a low-pass filter suitable for 6m operation they could part with? I worry that my homebrew 100-watt 6m amp might need a safety net... Steve WD8DAS
Re: [AMRadio] Don Merz Changing e-Mails
Don, It's bad enough to loose your job but an INSULT to have to train your replacement. They probably tied your severance to staying to the end and doing the training. At least when I was laid off from IBM we were given a month to try to find another position within IBM, although with 14,000 loosing their jobs that year I doubt that it ever happened. My manager allowed those of us being released to continue to use company assets such as our laptop and office space if desired, but did not require us to report to work. He felt that company was obligated to give us a head start on our job search. Good luck in whatever you do whether it be retirement or another position somewhere else. My layoff was the best thing to happen to me in one way...I finally took the time to become a Ham, something that I thought that I would do for many years but never got around to doing. 73, Tom K3TVC
[AMRadio] Testing 123
Sorry for the QRM... Having some configuration issues... 73 Craig K6QI
[AMRadio] Kit Transmitter
Wonder what would happen if ole Fritz Bauer were still offering his kilowatt kit today? After adding a multiband tank of course ;-) http://www.rwonline.com/reference-room/milestones/2006.07.19-08_rwf_milestone_bauer_1.shtml Bauer 707 schematic available on this site as well. 73, Bob W9RAN
