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41. [AMPS] Diodes (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 23 Feb 2000 08:01:23 +0000; Erm, don't you mean "amen"? Wake up, Rich - I was agreeing with you! I rest my case. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon; /archives//html/Amps/2000-02/msg00518.html (9,471 bytes)
42. [AMPS] Diodes (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Wed, 23 Feb 2000 21:19:52 +0000; Ah, I see... sorry, that was a bit too cryptic for me. AND IF there are too few diodes in the string (a design fault) AND IF (in spite of the equalization of inverse voltages) one diode is still push; /archives//html/Amps/2000-02/msg00528.html (10,666 bytes)
43. [AMPS] Diodes (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 24 Feb 2000 09:15:32 +0000; No, because I don't have the capability to measure it at the actual junction temperature it will reach when operating at full load. Instead I buy quality parts and rely on uniformity from mass-produc; /archives//html/Amps/2000-02/msg00540.html (9,534 bytes)
44. [AMPS] Blow TL922 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 25 Feb 2000 12:52:09 +0000; The TL431 circuit is at: http://www.ifwtech.demon.co.uk\g3sek\boards\triode\triode-3.htm It's fully adjustable and certainly cheaper than a large zener. I don't really know how the IMD varies with ca; /archives//html/Amps/2000-02/msg00572.html (9,345 bytes)
45. [AMPS] N Connectors (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 25 Feb 2000 20:27:38 +0000; Amen, Rich :-) When they're perfect, N connectors are fine for US legal power up to at least 432MHz - but as Rich says, the weak point of N connectors is the inner connection which isn't much bigger; /archives//html/Amps/2000-02/msg00579.html (9,430 bytes)
46. [AMPS] 4CX800's vs 4CX1600 (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Sun, 27 Feb 2000 14:30:16 +0000; The 4CX1600B (pin base) and the 4CX1600U (GS23B, coaxial base) are NOT two versions of the same tube - they are completely different tubes, with different electrical characteristics. The anode dissip; /archives//html/Amps/2000-02/msg00600.html (9,103 bytes)
47. [AMPS] high power pre-amp (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 28 Feb 2000 07:46:02 +0000; The most helpful word I can think of is: don't! At that power level, sequencing problems are critical in order to avoid hot-switching, resulting in blown GaAsFETs and damage to the coax relays. Using; /archives//html/Amps/2000-02/msg00624.html (7,964 bytes)
48. [AMPS] 50 MHz Amp Details (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Mon, 3 Jan 2000 23:28:54 +0000; These tubes are new to us in the West, but they were old designs before the 3CX800 and 8877 were even thought of. Actually, the GS-31 and GS-35 tubes are electrically the same, with only a different; /archives//html/Amps/2000-01/msg00055.html (9,329 bytes)
49. [AMPS] 50 MHz Amp Details (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 4 Jan 2000 09:39:17 +0000; Then get yourself onto the Web and get some facts. By the way, when I said "When they're gone, they're gone," I didn't expect them to run out anytime soon - don't panic! However, AFAIK there isn't a; /archives//html/Amps/2000-01/msg00074.html (8,391 bytes)
50. SV: SV: [AMPS] Final.. (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Tue, 4 Jan 2000 09:53:26 +0000; There is at least one better way. Use a fixed 10m pi-network with the input capacitance of the tube(s) acting as "C2". Make C1 = C2, so the impedance transformation is 1:1. No tuning is required, and; /archives//html/Amps/2000-01/msg00075.html (9,082 bytes)
51. [AMPS] PEP philosophy (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 7 Jan 2000 08:10:46 +0000; The FCC quote is complete, accurate and consistent. It's also the same definition as is used in the UK. Just remember that the "Peak" in PEP means the peak of the *modulation* - not the peak of the R; /archives//html/Amps/2000-01/msg00173.html (9,580 bytes)
52. [AMPS] PEP philosophy (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 7 Jan 2000 18:23:41 +0000; There's no such thing as "peak power" because the power must be averaged over the whole RF cycle. You can't go peak-pickin' within the cycle. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Pract; /archives//html/Amps/2000-01/msg00179.html (8,642 bytes)
53. [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 13 Jan 2000 08:20:00 +0000; That's right. I'm not familiar with the way that instrument actually measures RF power, but it seems likely that it is *calibrated* using CW and a standard wattmeter. The statement about "peak voltag; /archives//html/Amps/2000-01/msg00249.html (14,461 bytes)
54. [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 13 Jan 2000 08:27:25 +0000; The FCC definition is exactly correct. It is the "average power supplied during one RF cycle". That is the definition of "power" in any AC/RF waveform. Two things are varying on very different timesc; /archives//html/Amps/2000-01/msg00250.html (9,834 bytes)
55. [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 13 Jan 2000 20:11:58 +0000; Me neither. Perhaps a certain hi-fi journalist could comment? 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; /archives//html/Amps/2000-01/msg00264.html (8,806 bytes)
56. [AMPS] Re: PEP - One of the horses is compelled to speak... (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Thu, 13 Jan 2000 20:30:57 +0000; [...] On the contrary, Bruce - your clarification was very welcome. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.demon.co.uk/g3sek -- F; /archives//html/Amps/2000-01/msg00265.html (7,692 bytes)
57. R: [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 14 Jan 2000 09:49:52 +0000; That's a very important point. No amateur "power" meter actually MEASURES RF power. Instead, it detects voltages and currents on the line, and INFERS what the power must be, often via a long string o; /archives//html/Amps/2000-01/msg00276.html (11,504 bytes)
58. R: [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 14 Jan 2000 20:44:07 +0000; The calibrations are done on CW, ie under steady-state conditions. A "peak reading" power meter displays the highest value of the rectified voltage - in other words it senses the peak of the modulati; /archives//html/Amps/2000-01/msg00287.html (9,147 bytes)
59. R: [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 14 Jan 2000 20:35:57 +0000; The test is whether the instrument can be calibrated directly from other non-RF physical standards. If so, it's a true measurement of RF power. If it needs another RF wattmeter or voltmeter for calib; /archives//html/Amps/2000-01/msg00288.html (9,758 bytes)
60. [AMPS] Watt meters and PEP (score: 1): Author: G3SEK@ifwtech.demon.co.uk (Ian White, G3SEK); Date: Fri, 14 Jan 2000 20:47:17 +0000; I hadn't realised that - I'm sorry that your technical honesty drove you out. But since you've de-cloaked, John, please could you tell us what the hifi industry purports to mean by "watts RMS" and "m; /archives//html/Amps/2000-01/msg00289.html (8,852 bytes)

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