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181. Re: [Amps] 432 Cavity Amps; Thomson TH 331 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 2 Mar 2012 18:54:38 +0000 (UTC); Sky king sky king do not answer. "Looking Glass" is an airborne SAC-operated command post to mirror (hence "Looking Glass") the ground-based SAC command post at Offut AFB. Current Looking Glass aircr; /archives//html/Amps/2012-03/msg00035.html (8,782 bytes)
182. Re: [Amps] Longshot - looking for 8873 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 6 Apr 2012 19:40:37 +0000 (UTC); Probably a dumb idea, but what about cutting and grafting a custom convection cooling anode to an 8874 or to a 3cx800? Similar to how some of the Russian tubes have interchangeable coolers. Paul, kg7; /archives//html/Amps/2012-04/msg00076.html (7,343 bytes)
183. Re: [Amps] Sensible filter Cap sizing (Leigh Turner) (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Wed, 23 May 2012 23:46:14 +0000 (UTC); I've been following the filter cap thread a bit just because I guess. For right or wrong, the PS I built last year has 5 x 500V 490uF caps that seems to be fine for my 2488 no load 3cx800 ps. There w; /archives//html/Amps/2012-05/msg00324.html (6,809 bytes)
184. Re: [Amps] Sensible filter Cap sizing (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 24 May 2012 11:33:19 +0000 (UTC); Hi Gang, I've had a couple comments about 5x500V not being enough for 2488V and that I should use 6 or 7 caps. When I was first building my ps, I was thinking along the same lines, and if I had 6 or; /archives//html/Amps/2012-05/msg00326.html (7,877 bytes)
185. [Amps] Bird 43 slugs (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 31 May 2012 01:06:21 +0000 (UTC); What will happen if you use the wrong frequency range slug in a bird 43 meter? Specifically, I have a legal limit 2m Amplifier and I have a 2500D slug (200-500 MHz @ 2.5KW). If I use this slug to mea; /archives//html/Amps/2012-05/msg00351.html (7,448 bytes)
186. Re: [Amps] Bird 43 slugs (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 31 May 2012 01:49:59 +0000 (UTC); Thanks for the quick answers. Since the slug is somewhat expensive and it's high power, I wanted to just get a sanity check before I gave it a try. All I need to see is if the output is even reasonab; /archives//html/Amps/2012-05/msg00355.html (7,522 bytes)
187. Re: [Amps] Amps Digest, Vol 114, Issue 49 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 21 Jun 2012 17:04:58 +0000 (UTC); Kasey Kahne and Hendrick Motorsports is sponsored by Trina solar. Message: 9 Date: Thu, 21 Jun 2012 08:43:57 -0500 From: donroden@hiwaay.net Subject: Re: [Amps] 4CX1500B's -- worth using? To: amps@co; /archives//html/Amps/2012-06/msg00344.html (10,222 bytes)
188. [Amps] 3CX400U7 in Alpha Linear? (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 3 Jul 2012 12:05:20 +0000 (UTC); I've thought about doing a similar thing in my 8874 amp with the U7, it seems like it should work just fine, and the price of the tubes is really great. As a test I had thought about just creating so; /archives//html/Amps/2012-07/msg00015.html (8,537 bytes)
189. Re: [Amps] ball on top (Mike Andrews) (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Fri, 13 Jul 2012 12:37:13 +0000 (UTC); I always thought the ball on top was so you didn't poke your (insert sibling)s eye out when you were using the antenna as a light saber. _______________________________________________ Amps mailing l; /archives//html/Amps/2012-07/msg00187.html (6,521 bytes)
190. Re: [Amps] $120 tube running a 1500 watt amplifier (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 20 Aug 2012 20:47:50 +0000 (UTC); As a comparison of surplus, the 4cx1500B was used in many ship and shore power amplifiers. The price for a NIB surplus 4cx1500B is substantually lower than the 3cx1500A7's and other EIMAC tubes. ____; /archives//html/Amps/2012-08/msg00345.html (8,428 bytes)
191. [Amps] items for sale (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 25 Oct 2012 01:13:23 +0000 (UTC); Hi everyone, I've listed some amplifier parts if you have a need: Tokyo Hy-Power 2.5KFx KIT http://www.ebay.com/itm/281009643746?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649 3cx1500D3 http://w; /archives//html/Amps/2012-10/msg00142.html (7,827 bytes)
192. [Amps] for sale (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 1 Nov 2012 22:50:25 +0000 (UTC); I still have a few items for sale if interested: http://www.ebay.com/sch/prdecker/m.html?item=281015019502&ssPageName=STRK%3AMESELX%3AIT&rt=nc&_trksid=p2047675.l2562 Thanks, Paul ____________________; /archives//html/Amps/2012-11/msg00000.html (6,168 bytes)
193. Re: [Amps] Amps Digest, Vol 122, Issue 2 (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sun, 3 Feb 2013 17:04:17 +0000 (UTC); Hi Paul, You could go with an HP ESP120 blade server supply from ebay for anywhere from $10 to $50 http://www.ebay.com/itm/HP-Compaq-226519-001-3000W-48V-Hot-Plug-Power-Supply-for-BL-P-Class-253232-0; /archives//html/Amps/2013-02/msg00019.html (7,825 bytes)
194. Re: [Amps] Heatsinks for SSPAs (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 2 Mar 2013 18:53:42 +0000 (UTC); It sounds great in theory and maybe in practice too. How do you mount the transistors to the chassis without a through hole into the water jacket? If you look at the NXP BFL578XR demo board, they are; /archives//html/Amps/2013-03/msg00053.html (8,081 bytes)
195. Re: [Amps] Freescale LDMOS devices (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Sat, 9 Mar 2013 23:46:22 +0000 (UTC); I don't know how the freescale parts are, but the NXP BLF578XR seems to be holding up well for me. with 4 watts I can drive it to about 1450W output with 52V @ 42A. I've been running it ~45% duty cyc; /archives//html/Amps/2013-03/msg00122.html (8,654 bytes)
196. Re: [Amps] SB-230 Power Question (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 19 Mar 2013 20:48:30 +0000 (UTC); I admit, I don't know anything about the SB-230, but 100W drive seems excessive for an 8875/8874, is there some sort of attenuation for the input? My 432 MHz amp using a single 8874 tube takes 25 dri; /archives//html/Amps/2013-03/msg00255.html (8,629 bytes)
197. Re: [Amps] SB-230 Power Question (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Tue, 19 Mar 2013 21:49:17 +0000 (UTC); That is what I guessed. I don't have a manual, just the tube datasheet ;) I guess you guys didnt read the manual either (-; The input is a bank of resistors to swamp power and the manual states 100W; /archives//html/Amps/2013-03/msg00259.html (11,265 bytes)
198. Re: [Amps] chassis maker (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Mon, 6 May 2013 15:26:55 +0000 (UTC); I build all rackmout and have found these to be a very good bargin and starting point. http://www.ebay.com/itm/19-W-x-8-6875-H-x-16-75-D-5U-Rack-Mount-Cabinet-Equipment-Enclosure-/180999658912?pt=US_; /archives//html/Amps/2013-05/msg00113.html (8,366 bytes)
199. Re: [Amps] Advice needed for SS amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 6 Jun 2013 00:44:23 +0000 (UTC); Hi Bill, I had an amp using the MRF1500 parts, based on the commercial Tokyo high power design. I also talked to the THP guys for a while at Dayton and they are phasing out their ARF1500 design using; /archives//html/Amps/2013-06/msg00056.html (10,025 bytes)
200. Re: [Amps] Advice needed for SS amp (score: 1): Author: Paul Decker <kg7hf@comcast.net>; Date: Thu, 6 Jun 2013 02:22:02 +0000 (UTC); You might want to take a look at JE1BLI and JA1DJW article from September 2006 QEX http://www.mods-ham.com/03_Home-brew/Homebrew-Mods/ARF1500-PA/qx9ohsawa.pdf -- Original Message -- From: MU 4CX250B; /archives//html/Amps/2013-06/msg00061.html (11,640 bytes)

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