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181. Re: [Amps] QEX article for medium voltage MOSFET linear amplifierlink (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Sun, 13 Aug 2006 16:33:18 +0100; Can you tell us who the other company is? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00460.html (8,568 bytes)
182. Re: [Amps] Anodizing aluminum, painting etc. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Mon, 14 Aug 2006 18:38:48 +0100; It's surface area that dominates transferring the heat to the surrounding air. Mass plays a part in that you need enough material to effectively carry heat to the extremities. Mass also affect how fa; /archives//html/Amps/2006-08/msg00478.html (8,155 bytes)
183. Re: [Amps] Anodizing aluminum, painting etc. (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 17 Aug 2006 07:20:42 +0100; Many of the transistors I use have the mounting flange as the ground connection. Anodising is a no-no. It may add to it, I don't know. The way I was always It works both ways round - I like Tom's ana; /archives//html/Amps/2006-08/msg00524.html (10,166 bytes)
184. Re: [Amps] 3CX800A7 Orientation (score: 1): Author: "Steve Thompson" <g8gsq@eltac.co.uk>; Date: Thu, 17 Aug 2006 16:27:17 +0100; At 25C air temperature, a Papst 4600 family axial 120mm fan meets the flow rate for about 700W diss. provided you take care with the airflow design. It's the same size as the Dentron original, but I'; /archives//html/Amps/2006-08/msg00528.html (7,723 bytes)
185. Re: [Amps] HV transformers I want to series primary and parallelsecondary (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 18 Aug 2006 21:38:47 +0100; Can't see any problem, but I always use a separate bridge on each parallel secondary and common the outputs - it's probably not essential but it avoids the possibility of wierd reverse current effect; /archives//html/Amps/2006-08/msg00545.html (7,274 bytes)
186. Re: [Amps] Inverter Microwave HV Supply (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 23 Aug 2006 08:05:14 +0100; I get a 'can't be found' error for the domain. Is there a typo in there? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailma; /archives//html/Amps/2006-08/msg00626.html (7,268 bytes)
187. Re: [Amps] Inverter Microwave HV Supply (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 24 Aug 2006 07:56:22 +0100; Odd - I tried that yesterday and it didn't work, now it does. Probably my typing. I'm confused with the circuit around Q702. As I see it, it can only work if there's enough leakage in Q702 to charge; /archives//html/Amps/2006-08/msg00635.html (8,017 bytes)
188. Re: [Amps] Inverter Microwave HV Supply (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 24 Aug 2006 10:24:03 +0100; Thinking more about it, C703 will charge from a spike at Q701 collector that's higher than the + rail - but that spike might just kill Q701.... Steve _______________________________________________ A; /archives//html/Amps/2006-08/msg00637.html (9,163 bytes)
189. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Tue, 29 Aug 2006 07:38:13 +0100; What rise/fall time is needed to start something ringing at (say) 120MHz? Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mail; /archives//html/Amps/2006-08/msg00754.html (8,307 bytes)
190. Re: [Amps] Cutting G-10 Board (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 30 Aug 2006 11:17:39 +0100; If there's a pcb shop local to you, ask nicely if they will do some cuts on their guillotine. A few coins in the coffee fund is often enough payment. Their scrap bin is a good source of material too.; /archives//html/Amps/2006-08/msg00795.html (7,676 bytes)
191. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 30 Aug 2006 11:21:54 +0100; Sure, but how fast does the current change? By the time the decoupling capacitors have charged to allow the tube to drift into cutoff, I doubt the rise time alone is going to make the anode ciruit ri; /archives//html/Amps/2006-08/msg00796.html (10,779 bytes)
192. [Amps] Suppressors (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 30 Aug 2006 12:04:29 +0100; The point is that the suppressor can be viewed as a series L and R, with different values at each frequency. To my mind this is a much better way of looking at it. What we want from the suppressor is; /archives//html/Amps/2006-08/msg00798.html (10,220 bytes)
193. Re: [Amps] Suppressors (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 30 Aug 2006 14:10:07 +0100; From what follows I'm guessing 'this' means the 'high resistance' part? Yes, and maybe I should have said 'higher' rather than just 'high' - but are amplifiers unstable if you disconnect the blocking; /archives//html/Amps/2006-08/msg00805.html (7,597 bytes)
194. Re: [Amps] Suppressors (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 30 Aug 2006 17:56:03 +0100; Only at frequencies where the rest of the network between the suppressor and ground looks close to a short circuit. Any inductance in that path means that the anode load is not the Rp of the suppress; /archives//html/Amps/2006-08/msg00818.html (7,975 bytes)
195. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Wed, 30 Aug 2006 21:17:15 +0100; I wish I could reproduce that. I've tried repeatedly with spectrum analyser and 'scopes and only ever find operating frequency ringing, even with suppressors removed. I've tried with a couple of amp; /archives//html/Amps/2006-08/msg00824.html (10,861 bytes)
196. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Thu, 31 Aug 2006 22:51:49 +0100; Did that, no result. Hence my post. Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2006-08/msg00839.html (11,193 bytes)
197. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 11:25:52 +0100; I should have said 'ringing close to frequency the amp was tuned to'. I tried various couplings - a few inches of wire into a high impedance fet probe poked in lots of places. 1pF directly from the; /archives//html/Amps/2006-09/msg00006.html (8,856 bytes)
198. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 12:36:44 +0100; I hope not, I looked from 1MHz up to around 300MHz, in both full and part band sweeps. Around the tuned frequency was the only place I found repeatable signals. It's a laborious process as a spectrum; /archives//html/Amps/2006-09/msg00010.html (9,856 bytes)
199. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 12:38:23 +0100; Without question. All you need is time and inclination :-) Steve _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp; /archives//html/Amps/2006-09/msg00011.html (7,193 bytes)
200. Re: [Amps] Parasitics & Filament Sag (score: 1): Author: Steve Thompson <g8gsq@eltac.co.uk>; Date: Fri, 01 Sep 2006 15:06:10 +0100; If/when I ever look again, I'll try that. and disconnecting the I didn't have anything connected to the input for any of the tests. Steve _______________________________________________ Amps mailing; /archives//html/Amps/2006-09/msg00018.html (8,922 bytes)

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