Mail Archive Search: <+from:g8gsq@qsl.net>

Results:

References: [ +from:g8gsq@qsl.net: 314 ]

Total 314 documents matching your query.

241. [AMPS] Nichrome wire and tube chimneys! (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 14 May 2001 18:25:23 +0100; If you are going to need something noisy enough to have to live in another room, a motor/turbine assembly from a vacuum cleaner can come very cheap from a car boot sale (I guess that translates as '; /archives//html/Amps/2001-05/msg00266.html (8,479 bytes)
242. [AMPS] Voltage Doublers (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 16 May 2001 08:13:14 +0100; for 70cm using a voltage doubler planning on using IN5408 diodes and second hand, or 5 x 1500 uf 250vdc caps a thing as too much capacity in the stack, YES big C means big peak currents. Visit www.du; /archives//html/Amps/2001-05/msg00300.html (9,086 bytes)
243. [AMPS] Voltage Doublers (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 16 May 2001 14:11:43 +0100; for I'm Are you being a bit harsh on the transformer here, Ian? 12 ohms strikes me as quite low. Assuming a total source resistance of 50 ohms, simulation with 2 x 100uF caps shows 1.2A rms in the tr; /archives//html/Amps/2001-05/msg00304.html (9,278 bytes)
244. [AMPS] 4d36/cv5435 (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 16 May 2001 16:54:01 +0100; Can anyone help identify this for me, and/or where it's used? There's plenty of anode in there. I'll have a picture at the weekend when I get my camera back. Thanks, Steve -- FAQ on WWW: http://www.c; /archives//html/Amps/2001-05/msg00312.html (6,469 bytes)
245. [AMPS] Voltage Doublers (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 17 May 2001 10:41:38 +0100; With Glenn's new data, at 5mA load, 2300V, at 300mA, 2150V. Rs calculates at 29 ohms. Here's the line I added to the 'rectifier.txt' file: EHT, SS, 0.2, 20, 9.35, 6000, 200, 99 I'll leave anyone int; /archives//html/Amps/2001-05/msg00327.html (8,682 bytes)
246. [AMPS] Voltage Doublers (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 17 May 2001 10:48:13 +0100; Update - I'd left the caps at 2x100u in the simulation, which gave a reaonable 60V ripple. Changing to 2x40u as proposed by Glenn gives the same mean voltage but yields a lot of ripple, 115Vish. Usi; /archives//html/Amps/2001-05/msg00328.html (8,395 bytes)
247. [AMPS] Voltage Doublers (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 17 May 2001 15:54:31 +0100; snip Even if you find that the regulation and ripple are acceptable, don't forget to calculate the transformer dissipation as a sanity check. Then short the secondary with an ammeter and run it up on; /archives//html/Amps/2001-05/msg00331.html (8,443 bytes)
248. [AMPS] DJ5RE 2m Amplifier Tuning - Longish (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sat, 19 May 2001 09:36:58 +0100; I can't claim any experience with GS35, but 80mA grid current at idle seems very high. The data suggests 30ish. I know grid current isn't set in stone, but nearly 3x different strikes me as wrong. Lo; /archives//html/Amps/2001-05/msg00362.html (7,844 bytes)
249. [AMPS] Dirty Output (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 21 May 2001 08:12:09 +0100; 3,850 Sounds like it is oscillating at 25kHz. Try a different valve, and check the lf decoupling. Try putting a few ohms resistance in series with any lf capacitors. Steve -- FAQ on WWW: http://www.c; /archives//html/Amps/2001-05/msg00369.html (7,444 bytes)
250. [AMPS] Electrolytics (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 24 May 2001 14:12:41 +0100; This got me thinking, and I wonder if we are overly pessimistic about electrolytics, maybe based on the poor quality components of the past. Based on a 3kV supply with a stack of 10 x 330u 450V ordin; /archives//html/Amps/2001-05/msg00404.html (8,014 bytes)
251. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 25 May 2001 14:47:30 +0100; snip If you mean the 3 dB points in a filter (which is essentially what a matching network is), that is something completely different. I assume that's what you mean so I'll address that. bandwidth.; /archives//html/Amps/2001-05/msg00429.html (9,595 bytes)
252. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sat, 26 May 2001 10:08:10 +0100; it. As Tom said, a perfect capacitor would not heat up. A real capacitor has some resistance, and it's there that the heat is generated. The amount of resistance varies according to the dielectric ma; /archives//html/Amps/2001-05/msg00440.html (10,124 bytes)
253. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sat, 26 May 2001 10:20:16 +0100; --Original Message-- From: Jon Ogden <na9d@speakeasy.net> To: Steve Thompson <g8gsq@qsl.net>; amps@contesting.com <amps@contesting.com> To: <amps@contesting.com> Date: 26 May 2001 00:31 Subject: Re:; /archives//html/Amps/2001-05/msg00441.html (10,492 bytes)
254. [AMPS] safety check list (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 6 Apr 2001 08:09:20 +0100; One suggestion I received from the editor of a book I contributed to was to have a stick with about 100k (string of 10ks) plus a led at the end going to ground. If you use a low current led, it will; /archives//html/Amps/2001-04/msg00130.html (7,265 bytes)
255. [AMPS] Re:?: Cooling (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Sun, 8 Apr 2001 09:25:01 +0100; My penny/cent's worth - it's essential. Steve -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-a; /archives//html/Amps/2001-04/msg00179.html (6,567 bytes)
256. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 11 Apr 2001 08:08:46 +0100; --Original Message-- From: measures <2@vc.net> To: Conrad Farlow <conrad.farlow@virgin.net>; Douglas Snowden <Douglas.R.Snowden@noaa.gov> Cc: AMPS <amps@contesting.com> To: <amps@contesting.com> Date; /archives//html/Amps/2001-04/msg00245.html (10,453 bytes)
257. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Wed, 11 Apr 2001 15:27:41 +0100; we My groups TS830 is, indeed, excellent. As far as I know, GW4FRX does not sell regulators, although he did publish some articles and designs on the subject. Steve -- FAQ on WWW: http://www.contesti; /archives//html/Amps/2001-04/msg00251.html (9,773 bytes)
258. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 12 Apr 2001 09:13:55 +0100; A different aspect to consider - what happens when there is anode-screen flashover. I inherited a PSU (with 10x33V/5W zener screen supply) from a friend. A dud tube caused a flashover and lots of dam; /archives//html/Amps/2001-04/msg00264.html (8,240 bytes)
259. [AMPS] OT - help with info. please (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Thu, 12 Apr 2001 13:07:48 +0100; Can anyone help with info. on the bits at www.qsl.net/g8gsq please? The triode is a good looking beast, and the other thing is mind boggling. Coming for sale soon, once sorted and tested - 40s and 50; /archives//html/Amps/2001-04/msg00266.html (6,627 bytes)
260. [AMPS] Zener screen supplies (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Fri, 13 Apr 2001 09:11:20 +0100; Shorted zeners need replacing - I don't want to have to re-build the PSU every time. They surely did. Agreed - my point was that a screen circuit designed to run at 10ish mA isn't an obvious place to; /archives//html/Amps/2001-04/msg00292.html (9,982 bytes)

Current List: 241 - 260
Page: [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]