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321. [AMPS] Two Questions (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 13 Jun 2000 09:32:55 +0100; Why? 73 Peter G3RZP -- 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/2000-06/msg00137.html (7,101 bytes)
322. [AMPS] HV Fusing / Diode Protection (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 13 Jun 2000 09:41:39 +0100; The arcs are likely to be enough strain on the diodes, transformer and capacitors that mayhap you need good supply of those, too. Not every time, of course. Also, you need a mechanical arrangement so; /archives//html/Amps/2000-06/msg00138.html (8,495 bytes)
323. [AMPS] New Amplifier Manufacturer (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 13 Jun 2000 12:13:13 +0100; It's a bit disappointing that his web site says nothing about real performance parameters, such as harmonics, IMD and so on. Also, using gas tube voltage regulators for 4CX250 screen supplies has sur; /archives//html/Amps/2000-06/msg00140.html (9,027 bytes)
324. [AMPS] s meter calibration (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 13 Jun 2000 12:15:20 +0100; And the 'S' stands for 'suspicious' mostly, anyway. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.; /archives//html/Amps/2000-06/msg00141.html (8,318 bytes)
325. [AMPS] HV Fusing / Diode Protection (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 13 Jun 2000 17:47:37 +0100; Very true - I use one resistor in the present PSU, but it's about 6 inches long and 1-1/2 inch diameter, though. (Over the years, I've collected physically big vitreous enamelled resistors of 50 watt; /archives//html/Amps/2000-06/msg00151.html (9,581 bytes)
326. [AMPS] s meter calibration (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 14 Jun 2000 09:22:01 +0100; Question # 1: so what does it tell you as an operator if a signal is 50 microvolts or 25 microvolts in terms of real, on air operation? bearing in mind that the noise on 80m can easily be S5 and a re; /archives//html/Amps/2000-06/msg00170.html (9,800 bytes)
327. [AMPS] s meter calibration (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 14 Jun 2000 12:06:36 +0100; If we are going to set the signal generator to 50 microvolts pd (which is -73dBm) and then say that means 50 microvolts at the input to the receiver, that assumes the receiver input impedance. (Incid; /archives//html/Amps/2000-06/msg00171.html (10,995 bytes)
328. [AMPS] How To Design HV Glitch Protection Circuits (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 14 Jun 2000 16:47:08 +0100; Not if you're in the business of selling new sockets! If you are, on the other hand, buying sockets, it's extremely bad. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions:; /archives//html/Amps/2000-06/msg00177.html (7,704 bytes)
329. [AMPS] Commander 2500E (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Wed, 14 Jun 2000 18:31:57 +0100; It's interesting that the spurious emission limits for the Amateur Service, agreed by the ITU at WRC97, and accepted by amongst others, the USA, have so far not been incorporated into regulations for; /archives//html/Amps/2000-06/msg00179.html (9,745 bytes)
330. [AMPS] s meter calibration (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Thu, 15 Jun 2000 09:00:13 +0100; If you are an approved type testing laboratory, your typical conducted power measurement to a 95% confidence level is +/-0.75dB. That's 1262 to 1782 watts. Larry, you got any buddies at NIST who can; /archives//html/Amps/2000-06/msg00194.html (9,274 bytes)
331. [AMPS] s meter calibration (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Fri, 16 Jun 2000 08:49:21 +0100; That's one advantage of building model steam locomotives - in the final analysis, you make things fit, rather than measure them super accurately! 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.c; /archives//html/Amps/2000-06/msg00207.html (8,141 bytes)
332. [AMPS] Capacitor (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 20 Jun 2000 15:55:19 +0100; At N4700, they'll drift a lot when they get hot. About 14pF/deg C. Rich has warned about this phenomena before with caps with a big temp. co. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/F; /archives//html/Amps/2000-06/msg00274.html (7,663 bytes)
333. [AMPS] Talking SB-200 (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 09:28:45 +0100; I've had 'talking' 807s in a class B modulator. Dunno why. 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@cont; /archives//html/Amps/2000-06/msg00398.html (7,296 bytes)
334. [AMPS] RF filament choke for indirectly heated cathodes? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 09:51:52 +0100; The danger is to generalise too much, and say 'All tubes must have parasitic suppressors under all circumstances'. Some tubes are such you can never get away without suppressors; others, in some cir; /archives//html/Amps/2000-06/msg00399.html (9,515 bytes)
335. [AMPS] Coil heating (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 10:34:37 +0100; Then how does bunched conductors, let alone Litz, work? 73 Peter G3RZP -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contest; /archives//html/Amps/2000-06/msg00403.html (8,230 bytes)
336. [AMPS] Coil heating (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 12:21:29 +0100; Not in my books (Terman, and the ITT Reference Data for Radio Engineers) Skin depth for copper is 6.61/sq.rt. f where f is in Hertz and the depth is in cm, or 2.6/sq.rt f, where f is in MHz and depth; /archives//html/Amps/2000-06/msg00406.html (9,010 bytes)
337. [AMPS] RE: Litz Wire (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 13:14:37 +0100; Further to Dave's (K1FK) comments, Litz wire available over here always used to have a number of strands that were in powers of 3, so you had 3, 9, 27, 81 etc strands. This was so it could be braided; /archives//html/Amps/2000-06/msg00409.html (7,163 bytes)
338. [AMPS] Coil heating (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 13:18:00 +0100; Yes, no argument. But Steve said (in his original post) that the insulation burned off, so he had individually insulated conductors. are I'd rather the parasitic suppressor didn't get hot, although I; /archives//html/Amps/2000-06/msg00410.html (8,257 bytes)
339. [AMPS] JAN? (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Mon, 26 Jun 2000 14:05:45 +0100; Joint Army-Navy. JAN specs went further than just tubes, too. The US had the sense to try and rationalise between services, unlike the UK. In the UK, the same tube could have 4 different numbers - on; /archives//html/Amps/2000-06/msg00413.html (7,024 bytes)
340. [AMPS] ssr's in qro amps (score: 1): Author: Peter_Chadwick@mitel.com (Peter Chadwick); Date: Tue, 27 Jun 2000 07:38:01 +0100; I've asked before on this topic without an answer - maybe lucky this time. What's the failure mode for SSRs? Do they fail short circuit or open? Working on the basis that 'Murphy rules - OK?', I've a; /archives//html/Amps/2000-06/msg00431.html (9,703 bytes)

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