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101. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 3 Jul 2006 18:52:38 -0400; There is a physiological reason for this and it also coincides with the broad resonance seen at approximately 3.5 kHz on the classic Fletcher-Munson family of loudness curves. The ear canal forms a; /archives//html/Amps/2006-07/msg00150.html (11,966 bytes)
102. Re: [Amps] Safety grounding - was Mains Isolation Transformer (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 3 Jul 2006 20:40:50 -0400; chassis from the RF section. In the PS, Johnson used the chassis as the neutral for the low voltage transformers, etc. (driver, fans, bias, and filament supplies) that run on 120V. The chassis is al; /archives//html/Amps/2006-07/msg00157.html (9,496 bytes)
103. Re: [Amps] transformers (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Mon, 17 Jul 2006 07:00:51 -0400; Recently, at least three manufacturers have taken calibration of their products seriously. I believe Alpha (4510/4520), Array Solutions (PowerMaster), and now Larry Phipps' LP-100 product are calibr; /archives//html/Amps/2006-07/msg00493.html (9,384 bytes)
104. Re: [Amps] Grid fuses (was: Life and gain of 3-500Z) (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 19 Jul 2006 14:22:02 -0400; This brings up a point I've often considered... Is grid damage resulting from over-drive primarily the result of instantaneous high Ig, or is it more from a combination of both high Ig and duration?; /archives//html/Amps/2006-07/msg00643.html (10,280 bytes)
105. Re: [Amps] grid fuses (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 19 Jul 2006 22:29:43 -0400; It's a tough neighborhood here -- no doubt about it. However, I have probably learnd as much about amp design from the hostile discussions as much as the friendly ones. Make no mistake: I am not adv; /archives//html/Amps/2006-07/msg00655.html (9,338 bytes)
106. Re: [Amps] SB-220 rebuild advice (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 22 Jul 2006 12:31:15 -0400; All, What type of glitch resistor is recommend to reasonably sustain a glitch event? Both Alphas in the shack here use 50W, 50-ohm Clarostat wire-wound types, suspended from glazed-ceramic insulator; /archives//html/Amps/2006-07/msg00875.html (7,556 bytes)
107. Re: [Amps] making aluminum heat sinks black (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 22 Jul 2006 16:28:50 -0400; Anodizing aluminum increases themicity and results in a substantially better heat radiator over that of bare aluminum. The vast majority of heat-sinks are anodized, usually black or gold. The anodiz; /archives//html/Amps/2006-07/msg00895.html (8,327 bytes)
108. Re: [Amps] making aluminum heat sinks black (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sat, 22 Jul 2006 22:05:05 -0400; Agreed, Will. If you look my original message, I was speaking in terms of heat dissipation and not device heat transfer. I found some information concerning heat-sink design that may be of interest; /archives//html/Amps/2006-07/msg00902.html (9,842 bytes)
109. Re: [Amps] PIN diode mods (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 26 Jul 2006 07:06:06 -0400; Recall that the mass impetus for the move to PIN diodes came from a series of articles in QST in the mid-90s and were authored by the president of a well-known and prominent test equipment manufactu; /archives//html/Amps/2006-07/msg01153.html (10,335 bytes)
110. Re: [Amps] PIN diode mods (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 26 Jul 2006 07:30:42 -0400; lot 28.. Based on measured data, Yaesu began using PIN diodes in the receiver of the MP series. I imagine that if IP2 numbers aren't measurably improved when converting the FT-1000D, it is likely a; /archives//html/Amps/2006-07/msg01159.html (7,703 bytes)
111. Re: [Amps] PIN diode mods (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Wed, 26 Jul 2006 08:12:59 -0400; Wrong. According to Yaesu technical bulletin TB-93201 they started with lot 28 in FT-1000D... Jan, I'm sure your data is correct. I should have clarified that the MP series was Yaesu's first HF trans; /archives//html/Amps/2006-07/msg01163.html (8,108 bytes)
112. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 27 Aug 2006 12:57:30 -0400; To your point, I suspect that if we were to put the question to the designer of every commercial amplifier to explain the exact mathematical analysis used in determining their chosen R/L parasitic v; /archives//html/Amps/2006-08/msg00705.html (10,957 bytes)
113. Re: [Amps] NOS 4CX1000A test and reconditioning (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 8 Sep 2006 19:38:31 -0400; When I was in the broadcast business, I do not recall that being standard practice -- even in major markets where funding is not an issue. Sure, there may be a few stations that have tried it, but t; /archives//html/Amps/2006-09/msg00147.html (9,229 bytes)
114. Re: [Amps] NOS 4CX1000A test and reconditioning (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Fri, 8 Sep 2006 22:53:00 -0400; As I recall, a filament reduction to 80% is useful as "black heat" and some high-power commercial transmitters have the ability to go into a black heat mode during extended standby periods. This may; /archives//html/Amps/2006-09/msg00152.html (9,305 bytes)
115. [Amps] Bliss Motarized High-Power Tuner (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 14 Sep 2006 09:36:15 -0400; Some of you may know that John Bliss (W5EOE) manufactures a high-power (and hence the AMPS tie-in), motorized antenna tuner for balanced lines, but I thought some of you would be interesting in seein; /archives//html/Amps/2006-09/msg00197.html (7,656 bytes)
116. Re: [Amps] Bird wattmeters.... (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 24 Sep 2006 07:47:03 -0400; Try Tim, NM3E. I recently purchased a Bird dual Thruline section and metering panel from him and had a good experience. Another source is Dan, W7RF http://www.nm3e.com/ http://www.radiodan.com/bird/; /archives//html/Amps/2006-09/msg00290.html (6,766 bytes)
117. Re: [Amps] Is Amps still in existence? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 8 Oct 2006 10:44:27 -0400; I'm not sure what happened, but it seems that most of the AMPS activity is now on the Yahoo amplifier group. I detest the way that Yahoo runs their message boards and can only hope that it resumes he; /archives//html/Amps/2006-10/msg00048.html (7,639 bytes)
118. Re: [Amps] Is Amps still in existence? (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Sun, 8 Oct 2006 11:52:21 -0400; Ian: How about no form at all? Can you increase the wire or tubing size and only use a form for winding purposes only -- then remove the form. With large enough wire or tubing, a form should not be; /archives//html/Amps/2006-10/msg00052.html (8,032 bytes)
119. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 12 Oct 2006 08:40:34 -0400; can occur between 26-28 MHz. The new rule sounds great at first, but outside of relatively complex circuitry, how does a manufacturer offer a traditional (no microprocessor or internal freq. counter; /archives//html/Amps/2006-10/msg00084.html (8,147 bytes)
120. Re: [Amps] "10 Meter Ban" to be lifted ... (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 12 Oct 2006 14:01:52 -0400; "Years ago the Alpha 77Dx was manufactured with one 8877 tube and a square plate that could be removed to add a second 8877, making a 77Sx...." Yes, I own one with the plate still intact. Back in the; /archives//html/Amps/2006-10/msg00094.html (8,418 bytes)

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