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221. Re: [Amps] Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 15 Dec 2003 04:34:03 -0800
** The main difference being that combiners are the norm with solid-state due to the practical limit of a few hundred watts per module. Also, for the same number of watts of RF out, due to more wast
/archives//html/Amps/2003-12/msg00248.html (9,088 bytes)

222. Re: [Amps] 220VOLT LINE...Redux and ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 15 Dec 2003 08:25:04 -0800
** GFI breakers have a reputation for RF detection, so some ferrite beads and bypass caps may be needed. To pass NEC, the bypass caps must be 1400VDC-rated. If you want your station to be fully NEC-
/archives//html/Amps/2003-12/msg00254.html (8,165 bytes)

223. Re: [Amps] Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Mon, 15 Dec 2003 08:25:05 -0800
**High-efficiency BC-type designs are not suitable for applications where linear operation over a range of frequencies is required. _______________________________________________ Amps mailing list
/archives//html/Amps/2003-12/msg00255.html (7,640 bytes)

224. Re: [Amps] Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 16 Dec 2003 02:21:41 -0800
** Dr. Schmidt. Please explain why high-efficiency BC-type designs are suitable for applications where linear operation over a range of frequencies is required. Tnx _________________________________
/archives//html/Amps/2003-12/msg00259.html (9,302 bytes)

225. Re: [Amps] 220VOLT LINE...Redux and ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 16 Dec 2003 06:50:24 -0800
** Why not replace it with a plain-vanilla circuit breaker? ** Does she use the hair-dryer whilst in the tub? cheers, J. _______________________________________________ Amps mailing list Amps@contes
/archives//html/Amps/2003-12/msg00262.html (8,074 bytes)

226. Re: [Amps] 220VOLT LINE...Redux and ?? (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 16 Dec 2003 08:20:16 -0800
** If he loved his wife, would the Ham amp be plugged-in in the bathroom? If I pulled that little stunt, the Ham amp and the Ham could easily wind up in the tub at the same time. ____________________
/archives//html/Amps/2003-12/msg00266.html (9,200 bytes)

227. Re: [Amps] Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 16 Dec 2003 16:12:10 -0800
** Not linear is OK for SSB? The difference in S-units between an amplifier that 60% efficient and an amplifier that is 90% efficient - for the same power input - is 0.3 S-units, or 1.76db. _________
/archives//html/Amps/2003-12/msg00272.html (11,361 bytes)

228. Re: [Amps] Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Tue, 16 Dec 2003 17:09:33 -0800
** So why would a Ham want a not-linear amplifier? ** The bandswitch in a SB-220 is not very ok with a 3800vdc anode supply. 3000v is close to the limit for a SB-220. If one needs more output it tak
/archives//html/Amps/2003-12/msg00274.html (12,227 bytes)

229. Re: [Amps] High efficiency broadband designs (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 17 Dec 2003 01:52:41 -0800
** Dave -- Why not design a 90% efficient linear amplifier for the HF Ham bands, document the construction process, and show us how to on your Web site. ______________________________________________
/archives//html/Amps/2003-12/msg00276.html (8,638 bytes)

230. Re: [Amps] Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Wed, 17 Dec 2003 01:52:39 -0800
** I have yet to hear a Ham station on SSB who is getting 90% efficiency from his/her linear amplifier. My SB-220 linear amplifier probably uses c. $1.20 worth of electricity per month. Going to 90%
/archives//html/Amps/2003-12/msg00277.html (12,174 bytes)

231. Re: [Amps] Buck boost transformer (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 18 Dec 2003 06:43:01 -0800
** Regulation of the anode supply buys virtually nothing except bragging rights. The most critical potentials in an amplifier are filament-V and, for tetrodes and pentodes, screen-V. ________________
/archives//html/Amps/2003-12/msg00294.html (8,031 bytes)

232. Re: [Amps] Really Big Solid State Power Amplifiers (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 18 Dec 2003 06:43:02 -0800
** Good question, Steve. There could be a problem with junction-C on higher-Joule transient-V suppressors for RF service. _______________________________________________ Amps mailing list Amps@conte
/archives//html/Amps/2003-12/msg00295.html (7,833 bytes)

233. Re: [Amps] Re: Amps Digest, Vol 12, Issue 35 (score: 1)
Author: R.Measures <r@somis.org>
Date: Thu, 18 Dec 2003 06:55:55 -0800
** The sticky wicket with Class-E for Ham applications could well be the requirement for wide frequency coverage. However, since some Hams already use electron-tube monobander amps, maybe they would
/archives//html/Amps/2003-12/msg00296.html (8,777 bytes)

234. RE: [BULK] - [Amps] OPINIONS PLEASE (score: 1)
Author: R.Measures <r@somis.org>
Date: Fri, 19 Dec 2003 19:41:30 -0800
** I heard a rumour that the 3cx1200A7 is being phased out by the 3cx1200Z7. ** The 8877 grid is rated at 25w. If gold boils off the grid, it isn't from HF energy. ___________________________________
/archives//html/Amps/2003-12/msg00312.html (10,751 bytes)

235. Re: [Amps] TL-922 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 20 Dec 2003 04:09:46 -0800
** Bill -- Mouser carries the fuses, but the problem wasn't caused by defective fuses. My guess is that you had a parasite at c. 120MHz, which caused a domino effect, which eventually blew the fuses
/archives//html/Amps/2003-12/msg00319.html (8,497 bytes)

236. Re: [Amps] OPINIONS PLEASE (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 20 Dec 2003 04:09:45 -0800
** For what I do -- i.e., 40m and 60m daytime conversations with a dispersed group, the best antenna is a dipole at 30'. The best amplifier is whatever it takes to be heard over the jamming. In such
/archives//html/Amps/2003-12/msg00320.html (11,094 bytes)

237. Re: [Amps] Re: OPINIONS PLEASE (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 20 Dec 2003 05:20:55 -0800
** The weakness in the 3cx1200A7 is that it has twice as much feedback-C as an 8877. This problem was solved in the 3cx1200Z7. _______________________________________________ Amps mailing list Amps@
/archives//html/Amps/2003-12/msg00324.html (7,155 bytes)

238. Re: [Amps] Ceraminc Tube Testing Services Sought (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 20 Dec 2003 10:23:03 -0800
** My advise is: Send the tube to two rebuilding services. I have had the experience of having a good tube declared a dud so that the rebuilding service could make money either by recarburizing a tub
/archives//html/Amps/2003-12/msg00328.html (8,439 bytes)

239. Re: [Amps] Re: Amps Digest, Vol 12, Issue 41 (score: 1)
Author: R.Measures <r@somis.org>
Date: Sat, 20 Dec 2003 17:26:51 -0800
and will ** The "neutralizing" circuit in later production Al-1200s reportedly makes the tube more prone to oscillate at the AL-1200's VHF anode resonance than earlier models which do not have "neut
/archives//html/Amps/2003-12/msg00337.html (8,276 bytes)

240. Re: [Amps] DIODE / RECTIFIER BLOCKS: SILEC: SPECS ? (score: 1)
Author: R.Measures <r@somis.org>
Date: Sun, 21 Dec 2003 14:43:47 -0800
** Voltage ratings are not enough. A high-pot test to determine the actual avalanche potential is the bottom line. Amperage rating can be estimated fairly well from package size. ___________________
/archives//html/Amps/2003-12/msg00342.html (7,651 bytes)


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