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121. Re: [Amps] Bridging 120v loads across HV primary windings (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 2 Jun 2010 00:16:30 +0000 (UTC); I'm not sure that is exactly right. I think what is being said is hanging the 120 VAC loads across half the primary. In essence, the primary winding consists of two individual windings which can be; /archives//html/Amps/2010-06/msg00032.html (9,405 bytes)
122. Re: [Amps] Can I cool too much the tubes? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 16 Aug 2010 20:58:06 +0000 (UTC); "...the anode dissipation happens primarily by radiation, not conduction..." Doesn't radiation heat the air molecules around the tube, which in turn heats the glass and metal parts of the tube? Paul,; /archives//html/Amps/2010-08/msg00268.html (8,581 bytes)
123. Re: [Amps] Why do tubes cost so much? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 31 Aug 2010 13:07:04 +0000 (UTC); The Axioms probably hold true for the most part, but there are many cases in modern sales where they don't really hold. One case I can think of is software. There are many software products which ar; /archives//html/Amps/2010-08/msg00487.html (8,093 bytes)
124. Re: [Amps] Autotune amplifier. How to implement actuator / system for tank switching? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 11 Sep 2010 20:42:59 +0000 (UTC); You might also take a look at the URT-23 system specifically the AM-3924 amplifier, it's an auto tune system and uses a matrix of relays to bring in L and C for the tank circuit. The manuals and sch; /archives//html/Amps/2010-09/msg00091.html (7,826 bytes)
125. Re: [Amps] Switching Supplies for High Current Filaments (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 5 Oct 2010 19:33:44 +0000 (UTC); REPLY: What if instead of DC, the square wave (triangle or whatever) from the switchers transformer were used? ORIGINAL MESSAGE: _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2010-10/msg00034.html (8,087 bytes)
126. [Amps] Switching Supplies for High Current Filaments (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 7 Oct 2010 11:48:26 +0000 (UTC); I think making the switcher "ramp up" is pretty easy as most of them already ramp up their voltage at start up by varying the pwm duty cycle. I've done quite a bit of experimentation on this for a s; /archives//html/Amps/2010-10/msg00078.html (9,392 bytes)
127. [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 15 Oct 2010 21:32:13 +0000 (UTC); Hi Mike, What about the ARF-1500, a pair will get you legal limit. There was a writeup in QEX on them, and I believe the ARF-1500 datasheet was written by a fellow ham. Paul, kg7hf just looking for; /archives//html/Amps/2010-10/msg00244.html (7,325 bytes)
128. Re: [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 16 Oct 2010 01:24:16 +0000 (UTC); The title of the QEX article is "Get 1.5Kw from a new RF MOSFET: A legal limit HF linear, Tokyo Style" I think it's for members download only, but I found a copy here: http://www.google.com/url?sa=t&; /archives//html/Amps/2010-10/msg00254.html (8,805 bytes)
129. Re: [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 16 Oct 2010 22:20:24 +0000 (UTC); Hi Dan, You are right, heat and control are the primary issues to solve, and they can be solved in a solid state design just as they are in a tube design. When the QEX article came out, I contacted J; /archives//html/Amps/2010-10/msg00261.html (9,298 bytes)
130. Re: [Amps] New 2 PA design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sun, 17 Oct 2010 17:45:40 +0000 (UTC); The DL amp does look good. The 2.5k has the same type of bars and screw clamps as well. I used the same ones as well. Paul The DL guys that built that gizmo had it clamped with copper bars and scr; /archives//html/Amps/2010-10/msg00272.html (10,886 bytes)
131. Re: [Amps] HV rectifier strings - to bypass or not? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sun, 31 Oct 2010 15:58:22 +0000 (UTC); I have to agree, I've never lived anywhere in the US that had such poor power as the NE. Message: 8 Date: Sun, 31 Oct 2010 09:38:30 -0400 From: "Carl" < km1h@jeremy.mv.com > Subject: Re: [Amps] HV; /archives//html/Amps/2010-10/msg00490.html (9,152 bytes)
132. Re: [Amps] our amplifier in 2010 CQWW (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 9 Nov 2010 17:21:56 +0000 (UTC); Well, it is their contest, so it's their rules. Probably not the best idea to advertise breaking the contest rules, or was there a hint of remorse. I agree that antenna, location, and skill would; /archives//html/Amps/2010-11/msg00096.html (8,632 bytes)
133. Re: [Amps] our amplifier in 2010 CQWW (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 10 Nov 2010 01:49:54 +0000 (UTC); Nope, you deduct 10x for working them. That sends a clearer message ;) Paul, kg7hf Hmm. So, do you deduct those points earned from everyone who worked them, too? Inquiring minds want to know. Rob; /archives//html/Amps/2010-11/msg00120.html (8,526 bytes)
134. [Amps] Harris RF110 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 21 Dec 2010 22:20:51 +0000 (UTC); My memory might be getting a little "haze gray" now, but I seem to remember we regularly pushed much more than 1kw output with our 3924s'. I seem to remember sometimes doing 2 or 3k. Of course the; /archives//html/Amps/2010-12/msg00302.html (8,383 bytes)
135. [Amps] plate collet (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 4 Jan 2011 21:04:32 +0000 (UTC); Hi gang, Does anyone know where I can pick up an EIMAC 720829 plate collet ? I've searched the cpii web page and don't see a catalog or way to order other then calling them. It's for a 3cx800A7.; /archives//html/Amps/2011-01/msg00034.html (7,067 bytes)
136. [Amps] plate collet (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 4 Jan 2011 21:06:53 +0000 (UTC); Hi gang, Does anyone know where I can pick up an EIMAC 720829 plate collet? I've searched the cpii web page and don't see a catalog or way to order other then calling them. It's for a 3cx800A7. T; /archives//html/Amps/2011-01/msg00035.html (6,620 bytes)
137. Re: [Amps] plate collet??? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 6 Jan 2011 20:44:06 +0000 (UTC); It is also known as an anode collet. Basically it's a ring of finger stock which makes contact on the tubes plate. Collets are also used in the metal/ceramic power tubes on the grid ring. You woul; /archives//html/Amps/2011-01/msg00040.html (7,675 bytes)
138. [Amps] variable capacitors (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 25 Jan 2011 04:47:55 +0000 (UTC); Hi gang, I'm trying to track down some possible substitutes for some cardwell. I need something along the lines of the 160-205 and 160-208 caps. http://www.cardwellcondenser.com/PAGES/jcsp02.html Any; /archives//html/Amps/2011-01/msg00259.html (6,694 bytes)
139. Re: [Amps] variable capacitors (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 25 Jan 2011 15:10:24 +0000 (UTC); WOW, way more than I budgeted for this project. 160-205-1 Qty: 1 to 24 units, $68.63 each plus a $250.00 setup charge Qty: 25 to 99 units, $68.63 each no setup charge required Qty:; /archives//html/Amps/2011-01/msg00261.html (9,154 bytes)
140. Re: [Amps] variable capacitors (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 25 Jan 2011 15:52:20 +0000 (UTC); Thanks Carl. Legal limit on 432 to go along with the 6 x 15 yagi az-el array. I need 2 of each since I'm building two of the same. Paul Under $1 at Nearfest...wait a few months. Whats the VHF pro; /archives//html/Amps/2011-01/msg00263.html (7,285 bytes)

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