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References: [ +from:W4EF@dellroy.com: 306 ]

Total 306 documents matching your query.

221. Re: [Amps] Maximum RF output in practical application: 4-250A (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 3 Jul 2006 16:34:21 -0700
Amateur spectrum is only transiently scarce, Joe, and you know it. Most evenings out here on the west coast, 160, 75, and 40 meters SSB are desolate. If Art Bell and his buds want to crank open their
/archives//html/Amps/2006-07/msg00153.html (10,922 bytes)

222. Re: [Amps] Bandwidth tests (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 3 Jul 2006 16:48:16 -0700
I was figuring a white noise (gaussian) source would have large peak voltage excursions when I made that suggestion, Tom. Perhaps white noise AM modulated at a syllabic rate would be more appropriate
/archives//html/Amps/2006-07/msg00154.html (10,574 bytes)

223. Re: [Amps] 2kw sweep tube amp....again (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 7 Jul 2006 18:20:46 -0700
I should be noted that the 3IMD for the amp is -35dB below the single tone power, which would place it -41dB below PEP which I think is how ARRL specifies everything in test reports. This is pretty g
/archives//html/Amps/2006-07/msg00264.html (7,854 bytes)

224. Re: [Amps] grid fuses (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Thu, 20 Jul 2006 17:39:26 -0700
The cathode is typically connected to ground through the cathode bias network (zener diode in series with bias cutoff resistor/shorting relay) and the grid current return resistor (the grid current c
/archives//html/Amps/2006-07/msg00707.html (9,842 bytes)

225. Re: [Amps] 3cx3000A7 driver (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Fri, 21 Jul 2006 22:11:30 -0700
The "ULTIMO VOICE RECONSTRUCTOR /SOUND RECONSTRUCTOR" is even more impressive: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130009414507&ssPageName=MERC_VI_RSCC_Pr4_PcY_BID_Stores_IT Only $9895
/archives//html/Amps/2006-07/msg00837.html (8,594 bytes)

226. Re: [Amps] "Tubes 201" - How Vacuum Tubes Really Work (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 24 Jul 2006 06:41:09 -0700
Not that it probably helps, but 1 Angstrom = 1x10^(-10) Meter. Mike W4EF....................... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.cont
/archives//html/Amps/2006-07/msg01012.html (8,976 bytes)

227. Re: [Amps] flash arcs (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Wed, 26 Jul 2006 21:07:31 -0700
Per google: B.S. Gossling, "Flash Arc in High Power Valves", J.Inst.Elec.Engrs.(London) 1932 Vol. 71, p460-487 BTW, you are right, Jim. "IEEE Spectrum" is not peer reviewed, but it is a magazine not
/archives//html/Amps/2006-07/msg01208.html (7,910 bytes)

228. Re: [Amps] Ameritron Amps (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 29 Jul 2006 06:16:08 -0700
The nice thing about the AL82 is that it's very easy to drive. AFAIK, the L4B is zeo-biased at a lower anode voltage the same as the L-7 which requires bea coup drive to get anywhere close to 1500 wa
/archives//html/Amps/2006-07/msg01287.html (8,297 bytes)

229. Re: [Amps] Fw: Ameritron Amps (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 29 Jul 2006 07:49:46 -0700
Mike, I&acute;m getting 1 Kw PEP (meassured with a Drake MN2700 wattmeter) on my L7 (2.600 Volts) driving it with just 80 watts...is this what you call difficult to drive?...73s! EC1CT Fernando E-mai
/archives//html/Amps/2006-07/msg01297.html (7,942 bytes)

230. Re: [Amps] Ameritron Amps (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 29 Jul 2006 20:19:33 -0700
No doubt, Colin. You build your own amp because you want the learning experience and pride that goes along with homebrewing, not because you want to save a lot of money. Even if materials are a wash
/archives//html/Amps/2006-07/msg01352.html (9,245 bytes)

231. Re: [Amps] Checking for IMD (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sat, 12 Aug 2006 08:27:04 -0700
Even the 110 MHz head isn't terribly stable, Peter. I agree that a modern PLL/DDS based synthesizer for this analyzer would be a really useful project. Mike W4EF.................................... _
/archives//html/Amps/2006-08/msg00440.html (8,581 bytes)

232. Re: [Amps] Checking for IMD (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 14 Aug 2006 19:40:43 -0700
Sounds like the Flex Radio SDR-1000 would be ideally suited for this task. It has very a simple conversion scheme, high dynamic-range, and no analog AGC (either derived or applied). With a 44 KHz sam
/archives//html/Amps/2006-08/msg00496.html (9,676 bytes)

233. Re: [Amps] Checking for IMD (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 14 Aug 2006 20:17:14 -0700
No, Gary, it's an HF receiver/transceiver that uses a PC soundcard to handle IF filtering and demodulation: http://www.flex-radio.com/ http://www.flex-radio.com/articles_files/SDR-1000%20April%202005
/archives//html/Amps/2006-08/msg00498.html (9,832 bytes)

234. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 4 Sep 2006 11:10:04 -0700
Rich, Unless the effective parallel R across each component is zero, this can't happen. Draw the phasor diagram. If even the Xc and Xl vectors have the same magnitude, the load resistance and the eq
/archives//html/Amps/2006-09/msg00077.html (10,374 bytes)

235. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 4 Sep 2006 13:54:16 -0700
Sorry, I meant to say "effective parallel R across each component is infinite". I was thinking conductance and forgot to invert. 73, Mike W4EF......................................... ______________
/archives//html/Amps/2006-09/msg00078.html (10,284 bytes)

236. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 4 Sep 2006 14:03:35 -0700
Even a resonant circuit with finite loaded Q will store energy and cause a dip. There is no need to invoke an infinite Q resonance to have a dip. 73, Mike W4EF........................................
/archives//html/Amps/2006-09/msg00079.html (10,481 bytes)

237. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Mon, 4 Sep 2006 22:05:10 -0700
Perhaps, but your claim that infinite current will flow if an L-network if it is tuned to resonance at the operating frequency is simply incorrect. If that were true, tuning an amp would be a lot mor
/archives//html/Amps/2006-09/msg00087.html (11,269 bytes)

238. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 5 Sep 2006 05:35:57 -0700
Sure it can. Even if you are using ideal components with infinite unloaded Q, and an ideal voltage source (zero ohms source impedance), you can't get infinite current to flow in an L-network at "reso
/archives//html/Amps/2006-09/msg00095.html (11,304 bytes)

239. Re: [Amps] Parasitics & Filament Sag (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Tue, 5 Sep 2006 07:21:14 -0700
How the hell should I know? That's like asking a stranger what is the correct value of "R1" in some random circuit when they have no idea what you are trying to do with that circuit -:) 73, Mike W4EF
/archives//html/Amps/2006-09/msg00098.html (12,254 bytes)

240. Re: [Amps] Titan 425 Reflected Power (score: 1)
Author: "Michael Tope" <W4EF@dellroy.com>
Date: Sun, 24 Sep 2006 18:12:28 -0700
Jim, Sounds like you may have a load impedance that varies with applied power. Try the following experiment - put the the Titan in operate mode at full power, make the adjustment with the external tu
/archives//html/Amps/2006-09/msg00298.html (10,631 bytes)

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