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101. Re: [Amps] More instability problems (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 16 Apr 2013 08:47:04 -0700; I remember that it is a 4CX1500 or 4CX1000 but I don't recall the configuration -- was it cathode-driven or grid-driven? You certainly do NOT need a tuned input if it is grid-driven class AB1. The 50; /archives//html/Amps/2013-04/msg00122.html (10,579 bytes)
102. Re: [Amps] Tuned input design / measurement questions (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 16 Apr 2013 08:59:05 -0700; On 4/16/2013 8:37 AM, Chris Wilson wrote: I am unsure if the antenna matching "stuff" in my Kenwood TS-590 exciter precludes the need for this, though? I am trying to match 50 ohms to near 50 ohms,wh; /archives//html/Amps/2013-04/msg00123.html (9,269 bytes)
103. Re: [Amps] Tuned input design / measurement questions (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 16 Apr 2013 14:02:34 -0700; RF current flows from the cathode to the anode, then to ground through the tank circuit (it is blocked from the power supply). Then how does it get back to the cathode? If there is no tuned input, th; /archives//html/Amps/2013-04/msg00129.html (8,645 bytes)
104. [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 23 Apr 2013 09:52:15 -0700; I've been trying to find a good method to measure the inductance of large coils made out of tubing. For example, I have a coil made of 19 turns of 3/16" (about 4.8mm) tubing, 3.25" (8.3 cm) diameter; /archives//html/Amps/2013-04/msg00189.html (9,423 bytes)
105. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 25 Apr 2013 17:29:02 -0700; Thanks to everyone for your answers. Here is what I decided to do: I made a temporary hookup which includes the tube, the plate choke, the bandswitch and the pi-net components. I intend to set up the; /archives//html/Amps/2013-04/msg00216.html (10,548 bytes)
106. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 25 Apr 2013 21:44:38 -0700; I have learned that to use the AADE successfully you have to disconnect everything from the component you are testing! I made a temporary hookup which includes the tube, the plate choke, the bandswit; /archives//html/Amps/2013-04/msg00219.html (9,537 bytes)
107. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 25 Apr 2013 21:51:59 -0700; The GM3SEK spreadsheet allows for the influence of the plate choke. But if you compute the value of the tune capacitor without considering the choke, then you would not connect the choke while doing; /archives//html/Amps/2013-04/msg00220.html (10,929 bytes)
108. Re: [Amps] AADE LC meter (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 26 Apr 2013 08:15:55 -0700; Here: http://aade.com/lcmeter.htm On 4/26/2013 6:14 AM, TOMMY BEARD wrote: Sir What Is The AADE Tommy W4KVA _______________________________________________ Amps mailing list Amps@contesting.com http:; /archives//html/Amps/2013-04/msg00229.html (7,336 bytes)
109. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 26 Apr 2013 08:49:29 -0700; Yes, I stand corrected. The word ESTIMATE was used! A lot. I was just surprised at how different the value from the load line was, since I've seen the formula for estimating the impedance using the k; /archives//html/Amps/2013-04/msg00230.html (13,897 bytes)
110. Re: [Amps] Measuring tank coil inductance (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Sat, 27 Apr 2013 23:15:28 -0700; Let me see if I understand correctly. Suppose I want to have the amplifier work exactly according to spec. Then when I tune it with a steady carrier I want to have enough drive so that the zero-signa; /archives//html/Amps/2013-04/msg00238.html (15,134 bytes)
111. Re: [Amps] chassis maker? (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Sat, 04 May 2013 19:40:53 -0700; I am doing it what might be the hard way, but is a learning experience. I inherited some 1/8" aluminum sheet that I am using for chassis plates and inner and outer panels. I can cut it with a saber s; /archives//html/Amps/2013-05/msg00088.html (15,661 bytes)
112. [Amps] Updated amp pictures (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 28 May 2013 16:46:24 -0700; I've updated my web site with pictures of my ongoing 4CX1000A project and my 813 amplifier. Here is the 4CX1000A one: http://www.qsl.net/k2vco/4CX1000A/K2VCO%204CX1000A%20Amplifier.html And here is t; /archives//html/Amps/2013-05/msg00198.html (6,723 bytes)
113. Re: [Amps] Updated amp pictures (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 28 May 2013 17:15:33 -0700; Thanks. I'm not the best metalworker, and I'm no kind of an engineer, so my work doesn't compare with that of some of the guys who regularly post here. But hopefully it will be of interest. 73 Bob, W; /archives//html/Amps/2013-05/msg00200.html (8,318 bytes)
114. Re: [Amps] Updated amp pictures (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Wed, 29 May 2013 18:53:40 -0700; Interesting points. 1) I measured the air gap of the capacitor with a feeler gauge and it is about 0.012". If air breaks down at 30 kV/inch, then it is good for only 360V. 1500W at a 1:1 SWR is about; /archives//html/Amps/2013-05/msg00204.html (10,677 bytes)
115. Re: [Amps] Advice needed for SS amp (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Wed, 05 Jun 2013 09:58:11 -0700; Well, if nothing else, this project proves that you have guts (I used a different word, but remembered that this list is moderated)! Why such a large capacitor for the power supply? Surely 680 uf, on; /archives//html/Amps/2013-06/msg00047.html (10,139 bytes)
116. Re: [Amps] The Pin One Problem (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 07 Jun 2013 08:09:36 -0700; How about "broken shield problem"? At least that relates to the essence of the problem, which is that the shield isn't continuous, not a pin number, which is arbitrary. When you invent, create, or di; /archives//html/Amps/2013-06/msg00155.html (10,357 bytes)
117. Re: [Amps] Racal TTA1885/TA1823 (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Fri, 07 Jun 2013 09:06:59 -0700; If all else fails, I'll be happy to send some to John. Here in central California we are expecting 110 f (43 c) tomorrow. Oh. Hang on. You guys don't have air conditioners in your country, do you? It; /archives//html/Amps/2013-06/msg00160.html (9,008 bytes)
118. Re: [Amps] Electronic bias circuit shematic (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 27 Jun 2013 09:52:47 -0700; I don't like the idea of RF-operated EBS systems because it seems to me very hard to avoid distortion at the beginning of a CW character or syllable when the system first opens. What I have done in m; /archives//html/Amps/2013-06/msg00263.html (8,918 bytes)
119. Re: [Amps] Power output drop (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 10 Sep 2013 18:29:17 -0700; Does the line voltage droop when you transmit, causing a drop in filament voltage? Do you have ceramic capacitors in the tank circuit that heat up and detune the tank? Not that a drop from 1500 to 13; /archives//html/Amps/2013-09/msg00021.html (8,254 bytes)
120. Re: [Amps] Power output drop (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 10 Sep 2013 18:50:02 -0700; Yes, if it's the caps then retuning would bring it back up. I looked at the pix on your website and I see you have a bunch of 0.01 discs in parallel in series with the input. There is probably some h; /archives//html/Amps/2013-09/msg00025.html (10,267 bytes)

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