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221. Re: [Amps] Alpha 78 Problem (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 30 Dec 2009 07:58:22 -0500
I spoke with Ray Heaton about this back when I purchased my first 77Dx. On the Dx/Sx models, the EBS can be defeated by adjusting one potentiometer on the bias board. Plate idling current can be adj
/archives//html/Amps/2009-12/msg00569.html (8,501 bytes)

222. Re: [Amps] Alpha 78 Problem (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 30 Dec 2009 11:13:30 -0500
Carl, Not sure myself. Both mods I have in the files were drafted by prior 70V users but they look well-designed. Paul, W9AC . -- Original Message -- From: "Carl" <km1h@jeremy.mv.com> To: "Paul Chris
/archives//html/Amps/2009-12/msg00572.html (10,282 bytes)

223. Re: [Amps] which HV connector to use? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 12 Jan 2010 23:18:09 -0500
The Johnson Components Nylon "tip jacks" as used in the Alpha 70A/70V/77 are no better. A tip jack/plug combination was designed by Alpha to quickly separate the RF compartment from the PS. Although
/archives//html/Amps/2010-01/msg00120.html (9,626 bytes)

224. Re: [Amps] which HV connector to use? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 13 Jan 2010 00:03:37 -0500
Or in the alternative, an SHV connector as an improved type of HV disconnect over the MHV for added safety. With the SHV, the HV contact breaks path before the grounded shell contact path.. Paul, W9A
/archives//html/Amps/2010-01/msg00125.html (13,026 bytes)

225. Re: [Amps] External QSK (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 21 Jan 2010 12:17:01 -0500
Gary, This may be of interest to you... http://www.ad5x.com/images/Articles/QSKrevB.pdf Paul, W9AC _______________________________________________ Amps mailing list Amps@contesting.com http://lists.
/archives//html/Amps/2010-01/msg00271.html (6,561 bytes)

226. Re: [Amps] Ameritron (et. al.) filament voltages (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 29 Jan 2010 06:25:43 -0500
Data is needed to assess the effect of relatively short duration power cycles on filament life. We can read all the conjecture about monitoring rated filament voltage in an effort to extent filament
/archives//html/Amps/2010-01/msg00418.html (10,417 bytes)

227. Re: [Amps] why did Heath die? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 1 Feb 2010 09:26:55 -0500
When I worked as a post-grad student for RKO Radio in Chicago, we produced a number of highly professional projects using nothing more than the tools David described. For chassis and panel work, onc
/archives//html/Amps/2010-02/msg00010.html (8,296 bytes)

228. Re: [Amps] I dont accept answers to why did Heath die? (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 1 Feb 2010 14:17:53 -0500
The keyed element timing isn't the issue with the Flex -- it's the T/R turn-around time under the Windows O/S. According to the QST Product Review, the Flex-5000A switched in ~ 60 ms from Rx to Tx,
/archives//html/Amps/2010-02/msg00028.html (10,052 bytes)

229. Re: [Amps] RF issue (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 1 Feb 2010 16:49:06 -0500
However, the chassis of a rig powered by an external +12VDC supply should have a dedicated grounding conductor, especially if the rig is directly switching any moderately high voltage appliances (e.
/archives//html/Amps/2010-02/msg00042.html (6,851 bytes)

230. Re: [Amps] QRO Questions (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 6 Feb 2010 23:16:49 -0500
RG-400 is another PTFE variant, being similar to RG-142. Tooling dimensions are identical to RG-58 and RG-142; crimping and stripping tools designed for RG-58 work well with either RG-142 or RG-400.
/archives//html/Amps/2010-02/msg00173.html (8,342 bytes)

231. Re: [Amps] QRO Questions (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 7 Feb 2010 08:55:24 -0500
Roger, Most RG-400 and RG-142 is FEP jacketed and NEC CMP/MPP-rated for plenum use. My house does not use an air-return plenum, and I suspect most residential homes do not. In the event of a fire, t
/archives//html/Amps/2010-02/msg00179.html (8,171 bytes)

232. Re: [Amps] Vac Relays for B+ (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 7 Feb 2010 10:55:55 -0500
Many commercial amps use a 25-ohm @ 25W resistor in the B+ line between the filter cap and the anode(s). If regulation as a result of IR drop was an issue with R placed in front of the filter C, (and
/archives//html/Amps/2010-02/msg00184.html (13,111 bytes)

233. Re: [Amps] Vac Relays for B+ (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 7 Feb 2010 11:21:57 -0500
Thinking it through a bit further, a 25-ohm surge R placed between the filter C and anode(s) only results in 25V drop at 1A of Ip. So, in relation to a 3-4KV supply, that's insignificant. However, wi
/archives//html/Amps/2010-02/msg00187.html (15,541 bytes)

234. Re: [Amps] Reed Relay for QSK (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 8 Feb 2010 10:12:05 -0500
Rich, AG6K still sells them. Th RSD-12V went through several changes in manufacturing, beginning under the Panasonic Matsuhita name, then Aromat, and ended up under Panasonic Electric Works (PEW) na
/archives//html/Amps/2010-02/msg00236.html (8,504 bytes)

235. Re: [Amps] Resistor Before the Capacitor? (long) (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 8 Feb 2010 13:29:33 -0500
Jim, Regarding the placement of your 25-ohm surge resistor between the full-wave rectifier and the filter cap: Do you have the resistor placed between those components in the HV(-) or the HV(+) line
/archives//html/Amps/2010-02/msg00246.html (14,906 bytes)

236. Re: [Amps] Resistor Before the Capacitor? (long) (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 8 Feb 2010 14:10:05 -0500
Hi George, To Jim's earlier point, he did indicate that his series R between the full-wave rectifier and filter C needed to be augmented by an arc-fault resistor after the filter C for the very reaso
/archives//html/Amps/2010-02/msg00251.html (9,522 bytes)

237. [Amps] Alpha 87A/TenTec Omni VI Plus QSK Problem (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 11 Feb 2010 08:54:41 -0500
Yes, John. That published scheme will not work correctly between the Omni VI/VI+ and the Alpha 87A/89. It's been twelve years since I tried the "Y" adapter approach and it leads to truncation of the
/archives//html/Amps/2010-02/msg00308.html (9,411 bytes)

238. Re: [Amps] Results from new PSUD... resistor b4 the B+ filter caps ! (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 11 Feb 2010 12:16:44 -0500
But the series R between the rectifier and filter C should still keep current limited in the event of a filter C short -- and hopefully, assist in protecting the rectifier stack. That's something th
/archives//html/Amps/2010-02/msg00312.html (8,975 bytes)

239. Re: [Amps] Results from new PSUD... resistor b4 the B+ filter caps ! (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Thu, 11 Feb 2010 13:00:41 -0500
Well, that was obvious, Gary. Why couldn't I have visualized that until after hitting the send button? <g> Paul, W9AC _______________________________________________ Amps mailing list Amps@contestin
/archives//html/Amps/2010-02/msg00316.html (8,418 bytes)

240. [Amps] Ameritron QSK-5 Insertion Loss (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Fri, 12 Feb 2010 09:38:40 -0500
I'm looking to get some feedback concerning through-line loss of the Ameritron QSK-5. Loss is not specified by Ameritron as a function of frequency and after recently measuring loss through my unit,
/archives//html/Amps/2010-02/msg00340.html (9,507 bytes)

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