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81. [AMPS] Re: [TowerTalk] True Or Not True #2 (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 7 Sep 2001 07:39:25 +0100; Sure - in the absence of QRM, it's a workable CW signal. You can easily set up a simulation with a signal generator and an RMS- reading AC voltmeter. 0dB S/N is the same as (signal power) = (RX noise; /archives//html/Amps/2001-09/msg00100.html (8,990 bytes)
82. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 7 Sep 2001 20:07:56 +0100; I'm presently repairing a Heath SB-1000. Are there any modifications that would be worthwhile while the cover is off... besides a step-start and a glitch resistor, that is? 73 from Ian G3SEK Editor,; /archives//html/Amps/2001-09/msg00108.html (7,867 bytes)
83. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 8 Sep 2001 14:10:28 +0100; Thanks, everybody, for all the suggestions about the SB-1000. I'm still in "repair" mode at present, but will think carefully about them all. Meanwhile... Bad... let me explain. The glitch resistor h; /archives//html/Amps/2001-09/msg00123.html (10,996 bytes)
84. [AMPS] glitch resistors (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 8 Sep 2001 13:52:27 +0100; That's not true - and it can be dangerous! If the resistor is where you describe it, in a +3kV supply, a current surge from the HV+ rail will push the center-tap towards -3kV with respect to chassis.; /archives//html/Amps/2001-09/msg00124.html (9,443 bytes)
85. [AMPS] glitch resistors (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 8 Sep 2001 19:50:38 +0100; The initial current pulse comes out of the smoothing capacitor, so the transformer inductance does nothing to help. This same discussion happened here some months ago, and I put together a little web; /archives//html/Amps/2001-09/msg00137.html (10,033 bytes)
86. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Sat, 8 Sep 2001 19:41:36 +0100; Yup, they do. The wattage rating only applies when they are bolted to a large piece of metal, and the rated maximum voltage between the resistor and the body is only about 1000V AC. (I have used them; /archives//html/Amps/2001-09/msg00138.html (11,171 bytes)
87. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 10 Sep 2001 10:08:56 +0100; The real limitation for this application is power dissipation in normal operation. For say a 30 ohm resistance, 5W size clearly won't handle even 0.5A. Dissipation is downrated drastically with ambie; /archives//html/Amps/2001-09/msg00173.html (9,978 bytes)
88. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 10 Sep 2001 10:28:46 +0100; Not my thumb, but Eimac's. Based on the 40A limit that Phil summarizes below, it would actually be 25 ohms per kV. However, many people tend to use less than this (in consideration of the voltage dr; /archives//html/Amps/2001-09/msg00174.html (11,469 bytes)
89. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 10 Sep 2001 18:48:45 +0100; Count on it :-) 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ on WWW: http://www.contesting.com/FAQ/amps Submissions: a; /archives//html/Amps/2001-09/msg00191.html (9,113 bytes)
90. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 10 Sep 2001 18:47:13 +0100; Still watching those old black-and-white British war movies, I see... That's the idea! It will help a lot if someone in the USA can do the research on components and availability. 73 from Ian G3SEK E; /archives//html/Amps/2001-09/msg00192.html (9,653 bytes)
91. [AMPS] Glitch Resistors (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 12 Sep 2001 07:32:51 +0100; At a guess, it's much too short to avoid the risk of arcing from turn to turn when the full HV appears across it. Long and thin is what's needed here. 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'; /archives//html/Amps/2001-09/msg00211.html (9,149 bytes)
92. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 12 Sep 2001 16:27:13 +0100; Make that "...from failure due to a current surge occurring for *any* reason." It's best to keep an open mind about the causes, but by all means protect against the effects. 73 from Ian G3SEK Editor,; /archives//html/Amps/2001-09/msg00221.html (8,635 bytes)
93. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 12 Sep 2001 22:33:48 +0100; You appear to have forgotten that this very subject was discussed at some length back in January/February. Here are a few quotes from the literature. "Although a very high degree of insulation betwee; /archives//html/Amps/2001-09/msg00223.html (10,347 bytes)
94. [AMPS] SB-1000 mods? (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 13 Sep 2001 11:06:38 +0100; Nah... you're just not changing your memory backup batteries often enough. Or maybe it's parasitic diodes in the I/O ports :-) We all know that parasitic oscillations can be a cause of current surges; /archives//html/Amps/2001-09/msg00226.html (9,381 bytes)
95. [AMPS] About triodes, tetrodes and IMD (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Fri, 14 Sep 2001 20:32:11 +0100; Yes, I do sell screen regulators - but I don't sell hype. What I sell is based on clear technical information. It's on my website for anyone to see, and above all I want people to do their own thinki; /archives//html/Amps/2001-09/msg00254.html (7,819 bytes)
96. [AMPS] IMD (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Mon, 17 Sep 2001 19:16:32 +0100; Good point. It emphasizes that the performance of an amplifier is a combination of several things: * The tube(s) * The circuit configuration * The power supply * The operator who tunes, loads and dri; /archives//html/Amps/2001-09/msg00288.html (8,259 bytes)
97. [AMPS] IMD (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 18 Sep 2001 18:00:17 +0100; There's a confusion here between in-channel IMD and off-channel IMD. In-channel IMD is heard as distortion of the audio, and -40dB distortion is excellent quality for a band-limited speech signal. Of; /archives//html/Amps/2001-09/msg00326.html (10,559 bytes)
98. [AMPS] IMD (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Tue, 18 Sep 2001 17:17:58 +0100; Having given talks with Peter in the audience, I know just how they felt! 73 from Ian G3SEK Editor, 'The VHF/UHF DX Book' 'In Practice' columnist for RadCom (RSGB) http://www.ifwtech.com/g3sek -- FAQ; /archives//html/Amps/2001-09/msg00327.html (9,123 bytes)
99. [AMPS] Distortion Measurement Distortion (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Wed, 19 Sep 2001 17:12:48 +0100; For you and me, it's what happens on the air with speech that really matters. For labs and reviewers, they need some way to make consistent tests that are reproducible from rig to rig. However, these; /archives//html/Amps/2001-09/msg00356.html (9,350 bytes)
100. [AMPS] IMD (score: 1): Author: Ian White, G3SEK" <g3sek@ifwtech.com (Ian White, G3SEK); Date: Thu, 20 Sep 2001 10:32:01 +0100; It's true in principle that white noise contains equal components at all frequencies, but it doesn't contain the very strong components at syllabic rates that speech does. The frequency spectrum of s; /archives//html/Amps/2001-09/msg00363.html (8,404 bytes)

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