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121. Re: [Amps] Amplifier Rule Changes in the new R&O (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 14 Oct 2006 09:07:22 -0400
Pete, this section of the R&O essentially amounts to a status-quo change. Perhaps the most significant change relates to the ability to offer complete kits -- which may work to Elecraft's benefit. T
/archives//html/Amps/2006-10/msg00115.html (8,775 bytes)

122. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 14 Oct 2006 21:34:59 -0400
That's true with AM as no-modulation carrier power became reduced but I believe most other modes, including SSB and CW benefited from the FCC's rule change. Paul, W9AC ______________________________
/archives//html/Amps/2006-10/msg00124.html (9,005 bytes)

123. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 14 Oct 2006 21:56:32 -0400
Tom, I believe AM was the only mode adversely affected by FCC Docket 82-624. A 100% sine-modulated carrier of 375 watts output produces ~ 1500W PEP out. But under the old rules of a maximum limit of
/archives//html/Amps/2006-10/msg00128.html (8,732 bytes)

124. Re: [Amps] PEP power.. (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 16 Oct 2006 07:14:31 -0400
"RMS" or work power...What Gary is talking about is the real PEP power, or the highest very short term value of RMS power in a speech envelope...." The following paper by Roy Lewallen, W7EL, accurat
/archives//html/Amps/2006-10/msg00163.html (7,974 bytes)

125. Re: [Amps] PEP power.. (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 16 Oct 2006 14:17:45 -0400
This was the point of my post this morning. And if accuracy is important here on AMPS as I know it is to many, we should start using the right terms, not terms that are undefined. Paul, W9AC _______
/archives//html/Amps/2006-10/msg00182.html (7,515 bytes)

126. [Amps] Smith Chart Software (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 22 Oct 2006 22:22:31 -0400
I'm looking for a Smith Chart software package that will display all normal Smith parameters in detail -- close to the same level of detail as shown on the traditional graph paper chart. I've been us
/archives//html/Amps/2006-10/msg00237.html (6,387 bytes)

127. Re: [Amps] 8877 Longetivity (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sun, 28 Jan 2007 15:05:14 -0500
One method I've used is to add high-quality test point jacks to the amp's front or rear panel. Low-wattage metal-film resistors of 1K-ohm or so can be used to isolate the filament connection from th
/archives//html/Amps/2007-01/msg00300.html (7,926 bytes)

128. Re: [Amps] 3CV1500A7 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Feb 2007 10:14:35 -0500
Juan, The few new tubes that exist are locked up in our safe-deposit boxes. The 3CV1500A7 is electrically and in most respects, identical to the 3CX1000A7. The only difference is that the CV has a b
/archives//html/Amps/2007-02/msg00075.html (9,378 bytes)

129. Re: [Amps] 3CV1500A7 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Feb 2007 12:06:25 -0500
The inside of the boiler contains a baffle which, is used to help evenly distribute heat and minimize hot-spot bubbles formed if H2O temperature approaches 100-deg. C. Bubbles effectively form an in
/archives//html/Amps/2007-02/msg00081.html (8,227 bytes)

130. Re: [Amps] WATER for vapor cooled amplifier TSPA (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Feb 2007 12:12:35 -0500
John, That's probably the case. Perhaps what Zephyhills calls "distilled" goes through a de-ionizing process. I've always wanted to know the difference between the various water types sold on the gr
/archives//html/Amps/2007-02/msg00083.html (8,211 bytes)

131. Re: [Amps] WATER for vapor cooled amplifier TSPA (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Feb 2007 13:02:40 -0500
John Lyles probably knows the numbers. In terms of the Alpha 70V, water leakage is measured between 0-5 mA DC, with 5 mA being off scale. Assuming that the metering is correct (big assumption), I ty
/archives//html/Amps/2007-02/msg00089.html (8,903 bytes)

132. Re: [Amps] WATER for vapor cooled amplifier (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Feb 2007 14:32:29 -0500
A significant difference in the use of water with RF loads is that it is not mixed with high-voltage and accordingly, probably no real reason to minimize leakage, but immunity to long-term corrosion
/archives//html/Amps/2007-02/msg00096.html (8,134 bytes)

133. Re: [Amps] DI water explainationTSPA (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Tue, 6 Feb 2007 19:01:07 -0500
Use stainless steel, brass, copper, or plastics." One point of interest with the Alpha 70V is that copper appears to be the only metal that comes in contact with water. The condenser is of a special
/archives//html/Amps/2007-02/msg00105.html (7,941 bytes)

134. Re: [Amps] 3CV1500A7 (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 7 Feb 2007 07:02:00 -0500
Great points, Dennis. I have often thought about adding a separate HV contactor relay to both Alpha amps for the purpose of applying HV at some reasonable time after lighting filaments. My gut has n
/archives//html/Amps/2007-02/msg00114.html (8,732 bytes)

135. [Amps] MOV Sizing (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 3 Mar 2007 07:41:00 -0500
I am planning on adding a set of MOVs to the AC line of a recently acquired Alpha 86 amplifier. I have reviewed Littlefuse's MOV Applications Guide but I am still a bit unclear as to the optimum clam
/archives//html/Amps/2007-03/msg00020.html (6,944 bytes)

136. Re: [Amps] MOV Sizing (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 3 Mar 2007 15:29:37 -0500
Bob & Bob, Good suggestions. I plan on adding a "whole house" TVSS or MOV unit in the near future. There's a lot of product out there. One personal reply I received from someone in the surge suppress
/archives//html/Amps/2007-03/msg00032.html (11,632 bytes)

137. Re: [Amps] MOV Sizing (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 3 Mar 2007 20:30:55 -0500
That makes a lot of sense. Some of the sources I've read recently advocate not using ground as a MOV reference for that very reason. High current surges may follow other grounding paths (coaxial cab
/archives//html/Amps/2007-03/msg00041.html (8,004 bytes)

138. Re: [Amps] MOVs on HV PS (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Mon, 5 Mar 2007 16:12:04 -0500
I can't speak on behalf of Tom, but I believe that is what he indicated and this agrees with a technical white paper I read from Littelfuse over the weekend. The discussion started with me asking ab
/archives//html/Amps/2007-03/msg00080.html (8,289 bytes)

139. Re: [Amps] drive power (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Sat, 17 Mar 2007 13:13:59 -0400
Unlike many other transceivers, the TS-870S exhibits low ALC overshoot at low transmit output levels, particularly when the Drive/Mic level is set to reflect very little ALC action. On CW, I apply o
/archives//html/Amps/2007-03/msg00202.html (7,945 bytes)

140. [Amps] Combining SS Amps (score: 1)
Author: "Paul Christensen" <w9ac@arrl.net>
Date: Wed, 28 Mar 2007 16:58:50 -0400
Recently, I have given some thought to combining a pair of medium-power, solid-state amps with the capability of achieving the FCC maximum power limit of 1500 WPEP on HF. Does anyone know a source of
/archives//html/Amps/2007-03/msg00376.html (7,226 bytes)

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