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References: [ +from:Peter_Chadwick@mitel.com: 967 ]

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281. SV: [AMPS] Linearizing Linears, feedback or feedforward (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 08:28:15 +0100; Since the performance was so poor from an efficiency point of view, I have to query the rationale behind doing it. If it's just a case of put 'more bands on it so people will think it's a better barg; /archives//html/Amps/2000-09/msg01135.html (9,161 bytes)
282. [AMPS] AL-80B Amps (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 08:39:56 +0100; Doesn't it depend on how you define 'standby'? I use the following logical states in my amp: ON - in the warming up period, not available for use STANDBY - ready to go but no HV, bias or screen volts; /archives//html/Amps/2000-09/msg01136.html (8,560 bytes)
283. [AMPS] Watt meters (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 08:45:00 +0100; Is it only in the UK that the storeman can say, 'Yes, I know you can see one on the shelf over there, but you can't have it because the computer says it isn't in stock?' That has actually happened to; /archives//html/Amps/2000-09/msg01137.html (7,730 bytes)
284. SV: [AMPS] Linearizing Linears, feedback or feedforward (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 09:26:04 +0100; For HF, it has some interesting problems in getting the correct phase match over the whole spectrum. Inherently, that also requires accurate matching in the time delays, too - effectively putting a v; /archives//html/Amps/2000-09/msg01138.html (10,487 bytes)
285. [AMPS] SB-220 Smoke Test (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 09:27:59 +0100; Surely youre not seriously suggesting that VLF parasitics CANNOT occur in HF amplifiers? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrati; /archives//html/Amps/2000-09/msg01139.html (8,711 bytes)
286. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 13:07:06 +0100; Does the SB220 have more than one choke in the plate - the usual shunt feed choke to the plate, and on the HV side of that choke, another one, in series to the HV?, with a bypass from the junction to; /archives//html/Amps/2000-09/msg01149.html (8,066 bytes)
287. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 16:29:02 +0100; Thanks Marv. That plate choke must have a lot of RF circulating current in it on 3.5MHz, then. Calculating the various resonances in that lot isn't trivial; you can see that depending on band and tun; /archives//html/Amps/2000-09/msg01152.html (8,324 bytes)
288. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 28 Sep 2000 16:56:23 +0100; 50 microhenries of plate choke with the shunt plate tuning capacitor, and the capacity of the loading capacitor in parallel (as it is connected through the long lead that is the tank coil), bearing i; /archives//html/Amps/2000-09/msg01154.html (8,749 bytes)
289. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 29 Sep 2000 08:22:37 +0100; 1. 50 uH in parallel with the combination of plate tank tuning capacitor and series coupling cap and series bypass cap. 2.The plate tank capacity is the capacity of the tuning capacitor plus the shun; /archives//html/Amps/2000-09/msg01167.html (9,492 bytes)
290. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 29 Sep 2000 08:42:49 +0100; Hmm......I think you mean 'at HF, using usual chokes'. It's not an uncommon practice in VHF amps, and used to be pretty usual in 'good ol' fashioned' Class C designs at HF, always with the caveat abo; /archives//html/Amps/2000-09/msg01168.html (10,080 bytes)
291. [AMPS] Feedback path 3-500Z (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 29 Sep 2000 12:47:15 +0100; My original comment was that there would be a resonance somewhere between probably 0.5 and 2MHz. I made no comment about 200kHz. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submi; /archives//html/Amps/2000-09/msg01172.html (9,064 bytes)
292. [AMPS] Caveat on Dentron Filaments + MLA-2500B Notes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 1 Aug 2000 07:38:31 +0100; Not all the Dale type metal clad resistors are inductive - certainly over here, there's a manufacturer who makes a non inductive variety. It uses Ayrton-Perry winding. I have some of these rated 200; /archives//html/Amps/2000-08/msg00001.html (7,541 bytes)
293. [AMPS] Caveat on Dentron Filaments + MLA-2500B Notes (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 1 Aug 2000 15:42:18 +0100; You know that good old New England saying - 'If it ain't bust, don't fix it' - there's a helluva lot of truth in it. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps; /archives//html/Amps/2000-08/msg00005.html (7,489 bytes)
294. [AMPS] 2000 ARRL Handbook question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 2 Aug 2000 12:14:41 +0100; When nichrome suppressors are used, is there a resistor in parallel with the inductor? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative; /archives//html/Amps/2000-08/msg00019.html (8,803 bytes)
295. [AMPS] 2000 ARRL Handbook question (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 3 Aug 2000 08:22:51 +0100; Rich, you've lost me here. To me Q is (in this context) XL/r. Let's have r constant with frequency; XL increases with frequency. Therefore the Q of an inductor rises as the frequency goes up, doesn't; /archives//html/Amps/2000-08/msg00034.html (9,437 bytes)
296. [AMPS] Suppressors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 3 Aug 2000 08:50:09 +0100; Especially when you remember that if the anode circuit parasitic resonance is lower in frequency than the grid circuit parasitic resonance, the thing won't oscillate anyway. For what it's worth, my f; /archives//html/Amps/2000-08/msg00036.html (8,308 bytes)
297. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 3 Aug 2000 10:41:59 +0100; Very true! 572Bs are amongst the worse. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems; /archives//html/Amps/2000-08/msg00039.html (9,374 bytes)
298. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 3 Aug 2000 13:47:08 +0100; I have a nasty suspicion that one of the problems with the classic suppressor is that the carbon comp resistor is pushed pretty hard in terms of dissipation, especially on the higher bands, by the fu; /archives//html/Amps/2000-08/msg00044.html (9,979 bytes)
299. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 7 Aug 2000 09:15:19 +0100; Having inherited my fathers junk box, as well as having built up mine over the last 40 years, I too have a number of brand new, never used carbon composition resistors. Measurements indicate exactly; /archives//html/Amps/2000-08/msg00144.html (10,411 bytes)
300. [AMPS] Suppressors, measurements, and acrimonious blather (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 7 Aug 2000 13:29:21 +0100; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2000-08/msg00146.html (9,280 bytes)

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