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161. Re: [Amps] 70cm amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 11 Jun 2011 01:17:29 +0000 (UTC); Thanks Mel. It's certainly not on par with what the highly expierenced builders in this group do, but I guess we all start somewhere. I've learned quite a bit during the process and already have a; /archives//html/Amps/2011-06/msg00146.html (9,010 bytes)
162. [Amps] Top vs bottom posting (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 16 Jun 2011 19:35:29 +0000 (UTC); Classic queue vs. stack. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2011-06/msg00183.html (6,603 bytes)
163. [Amps] old commercial amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 16 Jun 2011 23:57:37 +0000 (UTC); Now here's an amp! http://cgi.ebay.com/Johnson-Kilowatt-Desk-Transmitter-/330577398599?pt=LH_DefaultDomain_0&hash=item4cf7f2cb47 _______________________________________________ Amps mailing list Amps; /archives//html/Amps/2011-06/msg00195.html (7,140 bytes)
164. Re: [Amps] old commercial amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 17 Jun 2011 02:32:27 +0000 (UTC); The AN/FRT-31 is likely the ultimate ba, but not for typical house hold use. _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/; /archives//html/Amps/2011-06/msg00200.html (7,487 bytes)
165. [Amps] 8874/3cx400a7 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 17 Jun 2011 12:20:41 +0000 (UTC); A question I'm sure the experienced amp builders can answer. I was reading through the Eimac 8874 datasheet last night and found this paragraph: quote: HEATER/CATHODE OPERATION - The rated heater vo; /archives//html/Amps/2011-06/msg00206.html (7,969 bytes)
166. Re: [Amps] 8874/3cx400a7 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 17 Jun 2011 13:00:48 +0000 (UTC); Interestingly enough, the 3cx800A7 and 3cpx800A7 sheets don't have that paragraph. I suspect because they are only spec'ed to 350 Mhz. On the other hand, the 3cx800U7 has a similar paragraph showing; /archives//html/Amps/2011-06/msg00209.html (9,288 bytes)
167. [Amps] Risks from continuous discharge of high voltage ?? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sun, 3 Jul 2011 23:40:32 +0000 (UTC); I seem to remember reading or hearing somewhere that someone used a 3-500 or 4-1000 to produce x-rays running the tube basically at it's failure point. _______________________________________________; /archives//html/Amps/2011-07/msg00023.html (8,266 bytes)
168. Re: [Amps] High SWR (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 5 Jul 2011 19:23:16 +0000 (UTC); Since you believe resonance was well understood before the invention of of the vacuum tube, can you tell me what it was understood to be? As an amateur luthier... O f course it was, any musical in; /archives//html/Amps/2011-07/msg00055.html (7,628 bytes)
169. Re: [Amps] New NXP BLF578XR 1200W LDMOS FET is "indestructible" (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 22 Jul 2011 20:16:12 +0000 (UTC); Over the years I've heard many people say that adequately cooling a transistor is difficult because it is so small. It's really difficult for me to wrap my brain around that statement though after; /archives//html/Amps/2011-07/msg00265.html (9,774 bytes)
170. Re: [Amps] New NXP BLF578XR 1200W LDMOS FET is "indestructible" (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 22 Jul 2011 22:07:33 +0000 (UTC); Well that is exactly my point. I think with power mosfets, the drain is usually part of the outside package. The physical parts of the tube is small, the cooler is just an external part. case and; /archives//html/Amps/2011-07/msg00268.html (11,368 bytes)
171. Re: [Amps] MRF141g amp kit offered by CCI (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 23 Aug 2011 16:10:19 +0000 (UTC); Hi Ian, I've had similar expierences with Han, although I was trying to get the kit to work from 1.8 to 60 Mhz. I found it very difficult to bias the kit and to keep oscillation from occuring and ve; /archives//html/Amps/2011-08/msg00155.html (8,550 bytes)
172. [Amps] Stripline design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 5 Jan 2012 01:20:58 +0000 (UTC); Hi group, I have a homebrew 70 cm stripline amplifier built around the 3cx400A7 tube. As everyone know's, it's getting rare and expensive. I was thinking that it would be really easy to change over t; /archives//html/Amps/2012-01/msg00043.html (8,962 bytes)
173. [Amps] Stripline design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 5 Jan 2012 01:38:06 +0000 (UTC); Hi group, NHY to all! I am working on an amplifier mod and need some advice. I have a currently working 70cm stripline amp based on the 3cx400A7 tube. As everyone knows, that tube is getting rare and; /archives//html/Amps/2012-01/msg00046.html (8,599 bytes)
174. Re: [Amps] Stripline design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 5 Jan 2012 21:38:05 +0000 (UTC); Hi David, Thanks for the reply and the great information. I can put together some specifics and more pictuers of the inside of the deck, and using a copper foil wouldbe an easy way to test it. The 3c; /archives//html/Amps/2012-01/msg00069.html (10,525 bytes)
175. Re: [Amps] Stripline design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 6 Jan 2012 00:06:27 +0000 (UTC); I've had a casual interest in how striplines work for a while, but not to the point that I have started a detailed study. You've provied a great explanation. From what I can gather, the "stripline" i; /archives//html/Amps/2012-01/msg00074.html (14,036 bytes)
176. Re: [Amps] Stripline design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 6 Jan 2012 02:53:31 +0000 (UTC); Hi Gerald, I could use K1FO's design, but I already have a "nice" working unit. The K1FO won't physically fit in my RF chamber ( well it might with a hammer), and I just wanted to do something quick; /archives//html/Amps/2012-01/msg00076.html (11,542 bytes)
177. Re: [Amps] Stripline design (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 6 Jan 2012 13:08:06 +0000 (UTC); Thanks to everyone for the really good discussion on this, I've learned a few things. If there is no visible moon this weekend, I'll likely tear into my amp and take some internal dimensions. It won'; /archives//html/Amps/2012-01/msg00087.html (9,244 bytes)
178. [Amps] 432 MHz stripline (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 24 Jan 2012 02:30:37 +0000 (UTC); Hi gang, A few weeks ago I asked the group about modification to my 8874 stripline 432 MHz amplifier to replace it with a 3cx800. Well I made the modifications and extended just the very back portion; /archives//html/Amps/2012-01/msg00171.html (7,508 bytes)
179. Re: [Amps] 432 MHz stripline (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 24 Jan 2012 03:14:39 +0000 (UTC); Hi Gerald, You've hit the nail on the head on why I asked the question. Every time I took the stripline cover off and put it back on I got different results. In fact, I have a suspician the original; /archives//html/Amps/2012-01/msg00174.html (11,889 bytes)
180. Re: [Amps] 432 MHz stripline (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 26 Jan 2012 02:30:33 +0000 (UTC); Thanks Dave, I'll give that a try my "return loss" meter is actually pc based and provides a sweep generator (AIMuhf) then graphs the results of the sweep so I can likely run a sweep and see which di; /archives//html/Amps/2012-01/msg00195.html (8,744 bytes)

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