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21. [AMPS] roller inductor (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 15 Dec 1997 15:58:15 -0000; It's well documented that the electromagnets used for the electromagnetic method of isotope separation were wound using silver from the US treasury so that copper could be released for the war effor; /archives//html/Amps/1997-12/msg00299.html (6,864 bytes)
22. [AMPS] G2DAF linears (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 16 Dec 1997 13:00:49 -0000; 1994 The only problem with this is that in order to get repeatable measurements, you would have to use gated spectrum analyser techniques. However, a lot can be determined from the screen supply time; /archives//html/Amps/1997-12/msg00307.html (8,056 bytes)
23. [AMPS] linearity (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 17 Dec 1997 09:25:17 -0000; One of the most delicate tests for dynamic linearity is the use of two identical diode detectors on the input and output of the amplifier. They need feeding from something like a directional coupler; /archives//html/Amps/1997-12/msg00315.html (8,747 bytes)
24. No subject (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 22 Dec 1997 09:15:51 -0000; Rich, Are you suggesting that things have changed, and that there is such a thing as a free lunch? I'd sooner believe in a perpetual motion machine! If you call me a cynic, you may be right. But rem; /archives//html/Amps/1997-12/msg00339.html (7,049 bytes)
25. [AMPS] Rocky point effect (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 22 Dec 1997 09:12:32 -0000; In answer to all those who e-mailed ( sorry I haven't replied - been off work with 'flu since last Wednesday), I have got hold of G6JP, and he's trying to get the details of the paper presented at th; /archives//html/Amps/1997-12/msg00340.html (6,976 bytes)
26. [AMPS] Hum (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 3 Nov 1997 13:58:54 -0000; Rich's comment does bring out the fact that although 60Hz to 50Hz doesn't look that much - only (!) 20%, it can have a major effect on transformers that are a bit light on iron. Also, it's worth reme; /archives//html/Amps/1997-11/msg00018.html (7,370 bytes)
27. [AMPS] filaments (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 4 Nov 1997 09:31:29 -0000; As Rich says, you need a bigger filament to get more output. The same applies to the 4-250A and the 4-400A: they have the same 5v 14.1 Amp filament ratings. Quite probably the same filament design wa; /archives//html/Amps/1997-11/msg00033.html (7,144 bytes)
28. [AMPS] covers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 4 Nov 1997 09:36:08 -0000; If you must run it without covers, get lots of life insurance - that will provide some solace for the family. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@con; /archives//html/Amps/1997-11/msg00034.html (6,794 bytes)
29. [AMPS] TL922 failure (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 4 Nov 1997 08:19:15 -0800; Rich, you say: against Now if the EM force is going to bend the filament, the current has to be DC grid current, not AC at 130MHz - surely? Well, maybe 'surely', but it seems unlikely that the revers; /archives//html/Amps/1997-11/msg00042.html (7,978 bytes)
30. [AMPS] failures (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 7 Nov 1997 01:43:52 -0800; Rich, Intermittent parasitics still seem unlikely from a classical' viewpoint..............yet I admit that you have a lot of evidence on your side! I figure there's a quote from Hamlet applicable...; /archives//html/Amps/1997-11/msg00092.html (7,620 bytes)
31. [AMPS] re: autotuning (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 12 Nov 1997 10:15:23 -0000; (not yet >made), so measuring phases of the drive relative to the output will be simple That only gives you a zero output when the phases are 90 degrees apart. To get 180degree phase detectors is mor; /archives//html/Amps/1997-11/msg00171.html (8,207 bytes)
32. [AMPS] filaments (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Wed, 12 Nov 1997 14:44:28 -0000; Tom, you say:- [Snip from Rich] is an What has the equalising tap to do with using a current limiting core? I don't understand it - could you explain? Guess I'm just being thick, but the series heate; /archives//html/Amps/1997-11/msg00182.html (7,632 bytes)
33. [AMPS] series filaments (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 14 Nov 1997 12:50:00 -0000; Tom, Sorry, but you're avoiding my point. IF the current is adequately limited, where's the problem? If the current is not limited, all bets are off, your argument is perfectly valid (using 'argument; /archives//html/Amps/1997-11/msg00199.html (8,618 bytes)
34. [AMPS] bias (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 14 Nov 1997 13:02:07 -0000; Back in the late 1960's, RCA used a transistor feedback amplifier on the bias because of these problems. It was in their RF power data book, and worked fine - which is more than a diode and resistor; /archives//html/Amps/1997-11/msg00200.html (7,557 bytes)
35. [AMPS] bias (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Fri, 14 Nov 1997 15:17:03 -0000; I forgot to mention that either a three tone test with two of the tones close together (as, I believe, advocated by W8JI) or a 2 tone test with close tone spacing (<25Hz) really shows up some of the; /archives//html/Amps/1997-11/msg00203.html (6,932 bytes)
36. [AMPS] warning msg (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 17 Nov 1997 09:21:32 -0000; Folks, FYI To: <amps@contesting.com> not 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Prob; /archives//html/Amps/1997-11/msg00217.html (7,104 bytes)
37. [AMPS] auto transformers (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 17 Nov 1997 11:16:41 -0000; Bob, I wouldn't go so far as to 'never use' an autotransformer. If you do, it needs to be suitably rated - that means BIG and HEAVY. The existing plate transformer would be caned harder - more magnet; /archives//html/Amps/1997-11/msg00220.html (7,880 bytes)
38. [AMPS] series filaments (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 17 Nov 1997 11:20:39 -0000; That's where the advantage of a separate winding for each tube, centre tapped comes in, with the centre taps connected together - or even with their own cathode metering resistor if you want. The dow; /archives//html/Amps/1997-11/msg00221.html (8,772 bytes)
39. [AMPS] autoxfmrs (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Mon, 17 Nov 1997 14:41:49 -0000; Don't know exactly. Used one in a big tx when I was a lad at Marconi's in the mid sixties - it was a 3Amp 22Kv PSU, with a 25KV + xfmr. We had an autoxfmr to step down the 415v/phase to about 340 wit; /archives//html/Amps/1997-11/msg00228.html (7,195 bytes)
40. [AMPS] Re question (score: 1): Author: Peter.Chadwick@gpsemi.com (Peter Chadwick); Date: Tue, 18 Nov 1997 14:37:03 -0000; Tom, you say Isn't the Bird slug the same? There's mutual inductance between the centre of the coax line and the slug, and similarly there's capacitance between the line and the slug. The analysis of; /archives//html/Amps/1997-11/msg00243.html (7,476 bytes)

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