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21. [AMPS] Conjugate Matching In Class B and C Amplifiers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 14 May 2001 08:43:00 +0100; I've always had a conceptual problem with the idea of 'non-dissipative resistance', which tends to put me into the Bruene camp. When you consider a power bipolar transistor, it's 'output impedance' a; /archives//html/Amps/2001-05/msg00249.html (10,567 bytes)
22. [AMPS] Nichrome wire and tube chimneys! (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 14 May 2001 15:37:47 +0100; I've seen them here on a number of occasions - I've even ended up with 2 of them in the junk box. One is used for cooling my 4-250s from the top, with individual muffin fans blowing on the filament s; /archives//html/Amps/2001-05/msg00257.html (9,376 bytes)
23. [AMPS] Thar she blows... (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 15 May 2001 07:27:49 +0100; Commercial practice (I mean commercial transmitters, not commercially manufactured for amateurs) is often peculiar in this regard, depsite expenditure on thermal crayons and so on. My experience with; /archives//html/Amps/2001-05/msg00283.html (7,174 bytes)
24. [AMPS] Voltage Doublers (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 22 May 2001 08:38:56 +0100; Don't you also need to take into account the leakage inductance, which is effectively in series with the primary (or n squared it in series with the secondary)? May well be negligible for for a toroi; /archives//html/Amps/2001-05/msg00373.html (7,943 bytes)
25. [AMPS] EER Amplifier Technique (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 22 May 2001 08:50:36 +0100; Sri for late reply - went to Dayton! Try also: Petrovic V. and Gosling W., Polar Loop transmitter, Electronics letters, 1979, 15 (10) pp286 -288 Petrovic V. and Gosling W., A Radically New Approach t; /archives//html/Amps/2001-05/msg00374.html (7,569 bytes)
26. [AMPS] Dayton, getting back from the "big wow..." (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 23 May 2001 07:35:17 +0100; With modern medicine, even death isn't so certain......... 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@cont; /archives//html/Amps/2001-05/msg00382.html (7,134 bytes)
27. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 29 May 2001 16:04:46 +0100; A minor point is that the model with dissipative resistance does work to explain the loading of tuned circuits by the plate resistance in Class A stages - which is why the advantages of pentagrid con; /archives//html/Amps/2001-05/msg00493.html (9,443 bytes)
28. [AMPS] Sucking instead of Blowing (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 30 May 2001 07:53:31 +0100; Definitely violent agreement here. With the European equivalents to the 4-125 series, where there isn't a metal ringed base a la Eimac/RCA etc construction, I've found a very noticeable improvement i; /archives//html/Amps/2001-05/msg00510.html (7,868 bytes)
29. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 30 May 2001 08:08:32 +0100; Possibly a bit unfair, Rich, since the advertising is what pays the bills. To my mind, the greatest thing abt ARRL is the effort put into defending amateur radio internationally - where it counts. If; /archives//html/Amps/2001-05/msg00511.html (9,261 bytes)
30. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 30 May 2001 12:58:37 +0100; No. never heard it before. A bigger laugh is to think the directors of any national society of more than a handful of members (30? 50? 100 max) control it. Been there myself, done that........... 73; /archives//html/Amps/2001-05/msg00516.html (8,859 bytes)
31. [AMPS] Conjugate Matching and Efficiency (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 30 May 2001 17:22:05 +0100; Because I've been at ITU Task Groups and Working Parties and seen the League people working - as well as IARU. In those fora, dollars don't have quite so much pull - if they did, some of the space se; /archives//html/Amps/2001-05/msg00523.html (8,522 bytes)
32. [AMPS] test - pls ignore (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 9 Apr 2001 11:37:22 +0100; -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com; /archives//html/Amps/2001-04/msg00188.html (6,477 bytes)
33. [AMPS] 4-1000A Project (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 6 Apr 2001 17:13:40 +0100; Surely it's the square root of the sum of the squares of the two currents? i.e sq. rt [(Iload) squared + (Icap) squared] (Surprise - that gives the same answer as Tom quotes) Kirchoff suggests that i; /archives//html/Amps/2001-04/msg00189.html (8,180 bytes)
34. [AMPS] 4-1000A Project (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 5 Apr 2001 13:27:49 +0100; I NEVER have a metal watch strap. I saw a guy at Marconi wear one while standing in front of a 30kW rig with the covers off. He was taking notes on his clipboard, with his arm in line with the the ta; /archives//html/Amps/2001-04/msg00190.html (8,869 bytes)
35. [AMPS] 50hz? 25Hz??? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 9 Apr 2001 14:46:47 +0100; Don't know about 'consumer', but the latest Washington DC - Boston railway electrification has some 25 Hz over part of its length, if I remember the article in IEEE VTS News correctly. That line has; /archives//html/Amps/2001-04/msg00193.html (8,008 bytes)
36. [AMPS] 50hz? 25Hz??? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 10 Apr 2001 08:31:34 +0100; Does anybody know why 25Hz, anyway? 60 Hz you can sort of see from 60 seconds to the minute. 50Hz gives some convenient motor speeds like 3000, 1500, and 750. (2, 4 and 8 pole machines) The 16-2/3Hz; /archives//html/Amps/2001-04/msg00222.html (8,363 bytes)
37. [AMPS] Off topic (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 10 Apr 2001 08:40:22 +0100; I know this isn't really the place to ask, but does anyone know of any published information on the design of goniometers? (the radio ones, not the medical ones) 73 Peter G3RZP -- FAQ on WWW: http://; /archives//html/Amps/2001-04/msg00223.html (6,575 bytes)
38. [AMPS] Dayton amps people (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Apr 2001 08:51:58 +0100; I'm arriving on Wednesday, American Eagle willing - they usually screw it up - and leaving Sunday afternoon around 1600. I'm staying in the Crowne Plaza downtown, and will be in the Sultans of Schwin; /archives//html/Amps/2001-04/msg00262.html (7,252 bytes)
39. [AMPS] MLA2500 and screen voltage for 4CX800. (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 12 Apr 2001 09:02:52 +0100; Possibly the mu g1-g2? Intuitively, one would suspect high gm tubes to be more critical. Again, intuitively, it could explain why some tubes are better in a G2DAF than others. 73 Peter G3RZP -- FAQ o; /archives//html/Amps/2001-04/msg00263.html (8,964 bytes)
40. [AMPS] FS: Pair of large parasitic suppressors (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 17 Apr 2001 07:43:35 +0100; Being silver plated, I doubt they'll 'Measure' up............ 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@c; /archives//html/Amps/2001-04/msg00376.html (7,048 bytes)

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