Mail Archive Search: <+from:amps@txrx.demon.co.uk>

Results:

References: [ +from:amps@txrx.demon.co.uk: 190 ]

Total 190 documents matching your query.

141. [AMPS] Vacuum relay (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Tue, 28 Jul 1998 07:13:08 +0100; I have a kilovac H-1A relay which appears to have lost its seal - the glass has cracked round one pin and the plating on the actuator has gone corroded and pitted. I was aiming to use it for its curr; /archives//html/Amps/1998-07/msg00192.html (6,853 bytes)
142. [AMPS] 3CX800 (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Tue, 28 Jul 1998 07:21:04 +0100; I'm puzzled by some bits of the data. There is a lot of emphasis on the 600mA max. anode current, but under pulse conditions 1A for 200ms is allowed, 2A for 10ms and 8A max. on short pulses. If it ha; /archives//html/Amps/1998-07/msg00193.html (7,185 bytes)
143. [AMPS] Vacuum relay (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Tue, 28 Jul 1998 07:48:15 +0100; Oops - that wasn't clear. I do understand what cold switching is; before anyone wastes time explaining, I'm using cold switching and I want the relay to handle current, not high voltage. Steve -- FAQ; /archives//html/Amps/1998-07/msg00194.html (7,301 bytes)
144. [AMPS] MLA-2500 Help (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Thu, 30 Jul 1998 07:45:58 +0100; Adding more capacitance can also fry transformers with the (Ipeak)^2 Steve -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@; /archives//html/Amps/1998-07/msg00209.html (7,544 bytes)
145. [AMPS] 3CX800 (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Thu, 30 Jul 1998 22:30:17 +0100; Marvellous, thanks, Dick; you also answer the (unasked) follow-up question about running higher anode voltage. Steve -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.; /archives//html/Amps/1998-07/msg00210.html (8,503 bytes)
146. [AMPS] Solid State 1kw amp (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Tue, 2 Jun 1998 21:06:34 +0100; There is a Motorola application note by Helge Granberg describing such an amp. (sorry, not in the office to look up the number) - CCI might do some of the parts in kit form. Steve -- FAQ on WWW: http; /archives//html/Amps/1998-06/msg00028.html (8,614 bytes)
147. [AMPS] kW solid state amps (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Fri, 5 Jun 1998 07:11:26 +0100; I forgot earlier - the Motorola design using MRF150s was written up as a two part constructional article in QST(?) with details of control circuitry, harmonic filters and so on. I couldn't find my co; /archives//html/Amps/1998-06/msg00060.html (7,234 bytes)
148. [AMPS] kW solid state amps (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Fri, 5 Jun 1998 11:19:32 +0100; I still can't find the original, but I did find a reference to it in Microwaves & RF reprint (Jan 83) of the app. note: H Granberg, "MOSFET Power in the kW level", QST (December 1982, January 1983).; /archives//html/Amps/1998-06/msg00063.html (7,224 bytes)
149. [AMPS] IMD (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Fri, 5 Jun 1998 11:39:04 +0100; Steve's being picky: My copy is Single Sideband Principles and Circuits. It's a good book, as is the sequel - Single Sideband Circuit Systems. -- FAQ on WWW: http://www.contesting.com/ampfaq.html Su; /archives//html/Amps/1998-06/msg00097.html (6,728 bytes)
150. [AMPS] Low efficiency from AM6155 on 432 MHz (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Thu, 11 Jun 1998 07:44:16 +0100; It reads as if the anode load impedance is way too low. I doubt it - one reason for using silver is that silver oxide is a conductor, albeit not as good as the pure thing. Steve -- FAQ on WWW: http:/; /archives//html/Amps/1998-06/msg00144.html (7,876 bytes)
151. [AMPS] HV Transformer Secondary Resistance (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Wed, 17 Jun 1998 07:59:39 +0100; 40 pounds strikes me as a bit light - I'd expect 70+ at that rating. Some similar I had made a while ago had secondary resistance of <20 ohms. Steve -- FAQ on WWW: http://www.contesting.com/ampfaq.ht; /archives//html/Amps/1998-06/msg00177.html (7,764 bytes)
152. [AMPS] HV xfmr (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Wed, 17 Jun 1998 22:03:03 +0100; Hmmm - I didn't read the original posting properly, in too much of a hurry. The 3kVA transformer I got for G3RZP had a primary resistance of <0.2 ohms for 240V winding, which makes much more sense wh; /archives//html/Amps/1998-06/msg00196.html (7,836 bytes)
153. [AMPS] Review: SGC PowerCube (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Mon, 29 Jun 1998 07:41:49 +0100; Are you able to test when it stops being linear? Steve -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Probl; /archives//html/Amps/1998-06/msg00256.html (7,420 bytes)
154. [AMPS] Another arc question (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Sun, 10 May 1998 06:56:08 +0100; Again, sorry for joining in late. snip Bear in mind that any design of anode lead suppressor can only work given a low(ish) impedance path to ground at the tuning network. If by resonance or design t; /archives//html/Amps/1998-05/msg00140.html (9,915 bytes)
155. [AMPS] Blower on a GS35b Amplifier..?? (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Sat, 9 May 1998 23:28:01 +0100; Sorry I'm late in on this, been away for a week. Ordinary fans are never up to the job. Some very unusual axial fans can produce pressure (I once used a 4" fan turning at 22,000 rpm to get 100cfm at; /archives//html/Amps/1998-05/msg00141.html (8,455 bytes)
156. [AMPS] Another arc question (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Mon, 11 May 1998 06:52:29 +0100; big snip In a parallel circuit, lowering R reduces Q. If the suppressor has a reasonable path to ground at the matching circuit end, then it appears in parallel with whatever the valve looks like fro; /archives//html/Amps/1998-05/msg00150.html (9,286 bytes)
157. [AMPS] Resonances (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Thu, 14 May 1998 22:11:44 +0100; I had only a few moments before finishing today, but while I had the network analyser on, I looked at a 100pF variable such as might be used as an anode tuning cap - semi-circular vanes about 1.5" di; /archives//html/Amps/1998-05/msg00236.html (8,391 bytes)
158. [AMPS] Resonances (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Fri, 15 May 1998 07:24:43 +0100; I'd love to, but the amp has been put on 6m and I don't have any othe hf PAs - I'm not allowed as I can't send morse on a straight key. I've long thought exactly the same. Cheers, Steve -- FAQ on WWW; /archives//html/Amps/1998-05/msg00253.html (8,397 bytes)
159. [AMPS] Resonances (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Fri, 15 May 1998 07:21:46 +0100; Ok John, for the record: Yes, I was using the sith chart - it's how I think about all impedance (and admittance) issues. The analyser is a new 8714C, and I went throught he fulll open/short/50R cal t; /archives//html/Amps/1998-05/msg00254.html (8,341 bytes)
160. [AMPS] Low IMD Tetrode Query (score: 1): Author: amps@txrx.demon.co.uk (Steve Thompson); Date: Mon, 18 May 1998 20:16:25 +0100; True class A will always deliver the best linearity, but you get low output power. With bipolar transistors you typically get about 25% of dc dissipation as output power for -40dBc IMD on two tone. I; /archives//html/Amps/1998-05/msg00323.html (8,683 bytes)

Current List: 141 - 160
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]