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201. [Amps] hi -power 6m Amps. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 16 Jul 2010 05:25:52 -0700
Although I know you are not a fan of the RUSSIAN tubes, what about the GU84B, the so called 4CX2500? How stable and clean is it at 50 MHz? I realize that size of components get a bit more more precis
/archives//html/Amps/2010-07/msg00159.html (9,835 bytes)

202. [Amps] Salt water dummy loads (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 16 Jul 2010 07:40:52 -0700
http://www.qsl.net/k5lxp/projects/SaltLoad/SaltLoad.html Has anybody actually tried these things ?? He show flat swr on 10m. I'm thinking if a bigger version is feasible.. like 10-20-30 gals. And may
/archives//html/Amps/2010-07/msg00167.html (6,883 bytes)

203. [Amps] Salt water load (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 18 Jul 2010 08:36:51 -0700
REPLY: Reminds me of the April article in QST many years ago. The fellow dug a trench, filled it water and used for a reflector, I believe it was. 73, Bill W6WRT built one using a glass container. De
/archives//html/Amps/2010-07/msg00203.html (8,072 bytes)

204. [Amps] No parasitic choke question (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 28 Jul 2010 08:47:18 -0700
There seems to be three camps in this discussion.. Nychrome, no nychrome, and now neither. Eliminate the parasitic; eliminate the suppressor. \If eliminating the suppressor can : ( 1 ) produce less h
/archives//html/Amps/2010-07/msg00291.html (7,401 bytes)

205. [Amps] More parasitic choke questions (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 28 Jul 2010 08:33:46 -0700
Why is that impossible? On HF the resistor is almost shorted out by the inductor. The power absorbed will be less then 0.5% of the desired HF with a typical amp. 73 Peter power absorbed by the resist
/archives//html/Amps/2010-07/msg00292.html (9,858 bytes)

206. [Amps] Fw: TL-922 grid chokes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 6 Aug 2010 05:27:46 -0700
The grid chokes in my TL-922 were replaced with 10 ohm resistors by the previous owner. The amp works fine except on 10 M where the resistors go up in smoke within a few seconds. This bring up severa
/archives//html/Amps/2010-08/msg00053.html (8,146 bytes)

207. [Amps] Comparison of PCB-mount RF relays (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sat, 7 Aug 2010 07:21:17 -0700
As mentioned in an earlier post, the RTB14012F is also available in a 16 Amp version, and I also investigated that relay. Internally it is exactly the same construction as the 12Amp relay, but it has
/archives//html/Amps/2010-08/msg00078.html (9,346 bytes)

208. [Amps] Automotive Relays (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 9 Aug 2010 02:43:29 -0700
You and them must have back luck! I'm using a BN-86 on the TH7 and run RTTY contesting at 1500 watts. Never had an issue in the 8 years it's been up. The aftermarket baluns all seem to cause the SWR
/archives//html/Amps/2010-08/msg00109.html (9,021 bytes)

209. [Amps] Automotive Relays,bad eng. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 9 Aug 2010 04:57:17 -0700
Since the relays are arranged in a "tree" (one feeding two, each of which feeds two more) there are always three relays in line to each antenna. See: http://ameritron.com/man/pdf/RCS-10.pdf 73, ... J
/archives//html/Amps/2010-08/msg00111.html (10,908 bytes)

210. [Amps] Automotive Relays,bad eng. (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 10 Aug 2010 03:27:34 -0700
Per the RCS-10 manual, you can put a shorted PL-259 in the Antenna 1 jack, and when you power down the control box, the line to the shack is grounded. Since I only have 6 antennas, this is ideal, but
/archives//html/Amps/2010-08/msg00129.html (8,673 bytes)

211. [Amps] How do you - powering a SS amp with a capacitor? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 10 Aug 2010 05:10:38 -0700
ok, Vic I have learned a lot from this discussion and I am glad we got into it as there is a lot of interest in it among the newbies and those who are barely QRO literate, as it were. I believe that
/archives//html/Amps/2010-08/msg00130.html (14,987 bytes)

212. [Amps] How do you - powering a SS amp with a capacitor? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Tue, 10 Aug 2010 05:28:23 -0700
Just watch the plate voltage drop in a typical amp as you add compression. Unprocessed SSB in a typical amp may show 100 volt drop while heavily processed with compression and clipping might show a 3
/archives//html/Amps/2010-08/msg00131.html (10,764 bytes)

213. [Amps] Fw: Needed, quality watt meter (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 11 Aug 2010 15:46:40 -0700
Regarding using a "digital" display for making adjustments, Jim has just pointed out an interesting thing. The BEST displya for adjusting stuff is the kind of display (meter) with a moving pointer. R
/archives//html/Amps/2010-08/msg00161.html (10,295 bytes)

214. [Amps] Fw: Needed, quality watt meter (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 11 Aug 2010 23:54:58 -0700
REPLY: There are two different kinds of bargraphs. One just lights the segments one at a time, full on. The other (better) fades in the next segment as the measurement increases. That type is as good
/archives//html/Amps/2010-08/msg00174.html (9,237 bytes)

215. [Amps] Replacing bias string diodes in Harbach rectifier (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 12 Aug 2010 03:56:21 -0700
Thanks for the ideas, Bill. OK, so let's say I want to clean this amp up once and for all. No more accidents. For the bias string, I'm going to go with the 1N5408 diodes I already have, which have a
/archives//html/Amps/2010-08/msg00176.html (9,330 bytes)

216. [Amps] 50 watt stud mount zener diodes (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Thu, 12 Aug 2010 04:36:02 -0700
REPLY: 6A10s are a good choice, but for a high bias tube like a GS-35b you need a lot of them - about 40. (24 VDC x .6 V per diode). You may get tired of soldering. 73, Bill W6WRT perf boards in a te
/archives//html/Amps/2010-08/msg00177.html (11,020 bytes)

217. [Amps] 50 w stud mount zeners (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Fri, 13 Aug 2010 17:40:07 -0700
"6A10s are a good choice, but for a high bias tube like a GS-35b you need a lot of them - about 40. (24 VDC x .6 V per diode)." CW key up / key down regulation is not good with a string of diodes. Wi
/archives//html/Amps/2010-08/msg00199.html (10,082 bytes)

218. [Amps] Why no images allowed? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Sun, 15 Aug 2010 05:45:24 -0700
That is the reason Yahoo! Groups went to the system they currently have. Nobody has to download the attachment unless they are interested in it. But everybody gets a LINK to the attachment that appea
/archives//html/Amps/2010-08/msg00214.html (8,903 bytes)

219. [Amps] Not free QWERTY (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Wed, 18 Aug 2010 07:37:04 -0700
The Dvorak typing keyboard is vastly superior to the QWERTY one we have been fosted upon. If u want to make some easy money, tell a corporation that you can increase the speed of their data input ope
/archives//html/Amps/2010-08/msg00294.html (7,622 bytes)

220. [Amps] Can I cool too much the tubes or ants? (score: 1)
Author: "Jim Thomson" <jim.thom@telus.net>
Date: Mon, 23 Aug 2010 21:46:15 -0700
To all : Melting antennas is a very good sign since I am the last one to relate this story. Circa 1957. San Fernando Valley, CA W6HX, Ted Gillete builds a 20 meter amplifier for W6YMD using 2-- 4-100
/archives//html/Amps/2010-08/msg00356.html (8,163 bytes)

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