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References: [ +from:G3SEK@ifwtech.demon.co.uk: 419 ]

Total 419 documents matching your query.

301. [AMPS] parasitics (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 25 Apr 1998 09:45:20 +0100; ... except for the one who calls Peter "my husband". 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek -- FAQ on WWW: http; /archives//html/Amps/1998-04/msg00275.html (9,153 bytes)
302. [AMPS] QRO HF-2000 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 25 Apr 1998 09:36:36 +0100; Same problem with the old Vincent V-twin bikes. The front cylinder got plenty of cooling but the rear one was liable to burn up. Cue for yet more British oil leakage stories... 73 from Ian G3SEK Edit; /archives//html/Amps/1998-04/msg00276.html (7,669 bytes)
303. [AMPS] Anode current vs cathode current... (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 3 Mar 1998 17:13:02 +0000; Rich replied: What Rich says is correct (the whole posting) but I wonder if that's what Skip really meant to ask. There's a possible misconception that if you measure current in the B- minus rail, do; /archives//html/Amps/1998-03/msg00036.html (8,789 bytes)
304. [AMPS] Need Summer 96 Communications Quarterly (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 3 Mar 1998 21:57:16 +0000; It's also an excellent replacement for the 4CX250/B/R, but it needs power supply modifications to realize the full potential. With 2500V on the anodes and 375-400V on the screens, a pair of 4CX400As; /archives//html/Amps/1998-03/msg00037.html (8,861 bytes)
305. [AMPS] Anode current vs cathode current... (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 4 Mar 1998 07:37:29 +0000; If you let the voltage on the B-minus rail rise to "MOV/transorb/spark gap" levels, you can probably say goodbye to the meter (yet again?). The only sensible protection component for this position is; /archives//html/Amps/1998-03/msg00040.html (9,314 bytes)
306. [AMPS] RE: ALPHA AMPS...the contraversy continues!!! (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 9 Mar 1998 07:48:42 +0000; ...possibly because it had been cooked. RRs are road-tested without their final coats of paint, and then go back into the body shop to create that famous finish. After the final spray, the whole car; /archives//html/Amps/1998-03/msg00080.html (8,253 bytes)
307. [AMPS] RE: ALPHA AMPS...the contraversy continues!!! (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 10 Mar 1998 07:36:01 +0000; The urban folklore over here is that you'd never see a 'Roller' being towed. The garage would send a big van to remove the car from sight. Next time I see the guy who has worked forever in the factor; /archives//html/Amps/1998-03/msg00143.html (8,518 bytes)
308. [AMPS] Blowers for finned tubes (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 11 Mar 1998 13:52:18 +0000; Actually it's very easy using the method described by K6GT. Simply time how long it takes for the outlet air to inflate a large, light plastic bag. (To measure the inflated volume of the bag, suspend; /archives//html/Amps/1998-03/msg00172.html (8,733 bytes)
309. [AMPS] Blowers (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 12 Mar 1998 07:47:57 +0000; That's true, but it overlooks two points. One is that the air pressure is often quite low, and can be difficult to read accurately due to surface tension effects in the water tube. There may also be; /archives//html/Amps/1998-03/msg00202.html (10,867 bytes)
310. [AMPS] Benefit (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 14 Mar 1998 19:58:37 +0000; If you only ever make easy QSOs, you'll never miss that extra 1.5dB. But if you try to do more difficult things, like breaking or running pile-ups in QRM, or any kind of weak-signal work, +1.5dB *WIL; /archives//html/Amps/1998-03/msg00282.html (10,003 bytes)
311. [AMPS] 4CX1000A advice?? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sat, 14 Mar 1998 19:43:04 +0000; The 91B "absorbs" the input capacitance of the 4CX800As by making it act as C2 in a pi-network. The tube input capacitance is about 100pF total, and the fixed capacitors used for C1 are about the sam; /archives//html/Amps/1998-03/msg00284.html (9,491 bytes)
312. [AMPS] 4CX1000A advice?? (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 15 Mar 1998 19:57:25 +0000; The usual way, a DC blocking capacitor and RFC. Like I said, at all HF/VHF frequencies, the grids see the 50-ohm resistor connected directly to ground. That's a sweeping over-simplification. 73 from; /archives//html/Amps/1998-03/msg00311.html (8,923 bytes)
313. [AMPS] RIW amps (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 26 Mar 1998 09:15:30 +0000; The K2RIW cooling system DOES work with a pair of 4CX400As at 1kW output. I tested it a few weeks ago in a 6m amp, using temperature-sensitive paint at 200C and 250C. After prolonged key-down testing; /archives//html/Amps/1998-03/msg00430.html (12,222 bytes)
314. [AMPS] 4-1000 IDLING CURRENT (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 30 Mar 1998 13:52:35 +0100; In linear operation there has to be a compromise between output power and IMD. According to a former Eimac employee [*] there was always a struggle between the engineers and the marketeers over the "; /archives//html/Amps/1998-03/msg00483.html (9,198 bytes)
315. [AMPS] 4-1000 IDLING CURRENT (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 30 Mar 1998 22:39:30 +0100; Class A gives poor efficiency and good IMD, but poor output power compared with the same tube operated in class AB1 or AB2. I tend to downplay efficiency, because a "linear" amplifier adjusted for ef; /archives//html/Amps/1998-03/msg00493.html (8,609 bytes)
316. [AMPS] RCA 7213 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 31 Mar 1998 09:20:46 +0100; It would be a terrible waste. Using a UHF tube like a 7213 on HF would be like using a high-spirited racehorse to pull a cart. Worse than that, in triode-connected grounded grid (TCGG) the poor beast; /archives//html/Amps/1998-03/msg00494.html (8,061 bytes)
317. [AMPS] flash-discharge capacitors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 5 Feb 1998 07:43:34 +0000; Whatever the cause of failure is, it can be very slow acting. I've had two of these capacitors last for 2-3 years each, including many highduty sessions of contesting. The final failure is by voltage; /archives//html/Amps/1998-02/msg00017.html (9,454 bytes)
318. [AMPS] Filter Capacitors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 13 Feb 1998 22:47:34 +0000; Sorry, folks - 1 800 numbers don't work outside of the USA unless you go through the operator in the home country, which costs even more than a direct dialed call to an ordinary US number. No critici; /archives//html/Amps/1998-02/msg00091.html (8,411 bytes)
319. [AMPS] High Potential Tester (high-pot) Components (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 18 Jan 1998 19:58:29 +0000; Rich is right - it's a very useful tool. I was lucky enough to find a DC-powered inverter that goes up to 9kV, and powered it from a variable DC source. It works FB and can show a lot of new informat; /archives//html/Amps/1998-01/msg00055.html (8,858 bytes)
320. [AMPS] High Potential Tester (high-pot) Components (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 19 Jan 1998 09:26:57 +0000; Although a dual primary has the same number of turns on each winding, you can expect slightly different resistances (maybe up to about 10%) because the winding on the outside needs a longer length of; /archives//html/Amps/1998-01/msg00061.html (8,658 bytes)

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