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81. Re: [Amps] MOVs on HV PS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 05 Mar 2007 17:04:03 -0800; The mechanism is this. You have two pieces of gear plugged into two different branch circuits, and there is a low voltage connection between them. For example, one is a computer and the other is your; /archives//html/Amps/2007-03/msg00104.html (9,864 bytes)
82. [Amps] Grounding (was Old Power Cord (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 05 Mar 2007 17:56:11 -0800; The installation you described with everything bonded together outside is the right way to do it. You'll see the same thing at microwave, two-way, and cell sites. Yes, you do need to tie all of your; /archives//html/Amps/2007-03/msg00106.html (9,184 bytes)
83. Re: [Amps] Old Power Cord (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 06 Mar 2007 07:07:56 -0800; North American electrical codes, nearly all of which are patterned on the NEC, say that you must bond the power system neutral at the service entrance to an earth electrode of at least minimum qualit; /archives//html/Amps/2007-03/msg00112.html (12,747 bytes)
84. Re: [Amps] (Amps) This reflector. (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 20 Mar 2007 07:48:57 -0700; spins your turbine then we guess that's where you should be. I agree. I joined this list several years ago after nearly 50 years in ham radio with 100 watt radios. In response to BPL and increasingly; /archives//html/Amps/2007-03/msg00249.html (8,278 bytes)
85. Re: [Amps] Stupid questions... (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 21 Mar 2007 15:50:00 -0700; You've got an Extra Ticket. It's fair to assume that you studied radio and electronics to get it. That's far from being a neophyte. That's absurd logic. There are a few mistakes in a textbook, thus w; /archives//html/Amps/2007-03/msg00291.html (8,375 bytes)
86. [Amps] Noisy Power Transformer (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 18 Apr 2007 10:26:26 -0700; I've just acquired a vintage Titan 425. After fixing some problems, I think I may have it running OK, except that the power transformer is making a lot more noise on keydown than my two other Titan p; /archives//html/Amps/2007-04/msg00199.html (8,592 bytes)
87. Re: [Amps] 230v wiring question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 24 Apr 2007 12:16:55 -0700; little IR drop in such a short length. You MUST, however, pull a dedicated safety ground (green wire) with that line, and connect it to the third (round) pin on the outlet and to the ground bus in th; /archives//html/Amps/2007-04/msg00259.html (8,661 bytes)
88. Re: [Amps] 230v wiring question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 24 Apr 2007 16:52:46 -0700; While I completely agree with your comments about peak currents for ALL electronic equipment (and wrote about it three years ago in the power and grounding tutorial that is on my website), taking the; /archives//html/Amps/2007-04/msg00272.html (9,359 bytes)
89. Re: [Amps] 230v wiring question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 24 Apr 2007 17:21:15 -0700; As a member of several international EMail reflectors and international standards committees, I have learned that it is folly to assume that all of the members know trade names of products that are r; /archives//html/Amps/2007-04/msg00273.html (11,200 bytes)
90. Re: [Amps] Jennings and Kilovac vacuum relays for sale (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 06 Jul 2007 20:59:45 -0700; I don't think they're identical, but both are used in a lot of amps. Ten Tec used one for a while, then switched to the other. Gigavac makes both types and will sell them to hams at a special price.; /archives//html/Amps/2007-07/msg00055.html (8,021 bytes)
91. Re: [Amps] Jennings and Kilovac vacuum relays for sale (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 07 Jul 2007 07:38:05 -0700; Yes, so far. My first purchase was about 18 months ago, so not a lot of miles yet on the two that I've installed. They come nicely packaged, and are inscribed with a grinding tool to indicate that th; /archives//html/Amps/2007-07/msg00069.html (8,190 bytes)
92. Re: [Amps] Transformer question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 09 Jul 2007 15:56:29 -0700; Tom's reading of NEC is the same as mine. However -- I have heard that there used to be some exception for certain heavy appliances. If that execption exists, perhaps someone could cite the specific; /archives//html/Amps/2007-07/msg00129.html (9,569 bytes)
93. Re: [Amps] ALPHAs and momentary power outages (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 16 Jul 2007 08:00:35 -0700; How about a UPS? If all we're talking about is a few seconds, one of the beefier 240V models would probably have held it up. Jim K9YC _______________________________________________ Amps mailing list; /archives//html/Amps/2007-07/msg00265.html (7,554 bytes)
94. Re: [Amps] ALPHAs and momentary power outages (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 16 Jul 2007 14:18:33 -0700; Tom is right, of course. BUT: let's not lose track of the original problem, which is SHORT (a few seconds) interruptions of mains power that cause the Alpha's filament timer to reset. Paul's major co; /archives//html/Amps/2007-07/msg00280.html (8,800 bytes)
95. Re: [Amps] ALPHAs and momentary power outages (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 17 Jul 2007 21:00:35 -0700; Sometimes simple and brute force is better. Earlier in this thread, it was suggested that the timer was microprocessor based, not in discrete circuitry, and was not easy to reprogram. Some things are; /archives//html/Amps/2007-07/msg00317.html (9,627 bytes)
96. Re: [Amps] ALPHAs and momentary power outages (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 18 Jul 2007 10:27:15 -0700; The lytic sounds like the best approach if you can figure out where the timer is getting its voltage sample (and its own power). I don't like the battery idea -- If it held the system up through too; /archives//html/Amps/2007-07/msg00327.html (9,853 bytes)
97. Re: [Amps] AL-80B transformer tap (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 23 Jul 2007 17:58:29 -0700; Tom is a very experienced RF engineer who designs amps. He does a lot of science (that is, controlled experiments and study of the basic principles) to figure out what parameters really matter and wh; /archives//html/Amps/2007-07/msg00394.html (8,551 bytes)
98. Re: [Amps] Ameritron amp purchase decision questions (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 27 Jul 2007 09:08:57 -0700; Rusty, You've gotten some great answers already. I'll add this. This "headroom" issue is a lot more important than you might realize. If an amp is rated 1,000 watts and you run it at 1,000 watts all; /archives//html/Amps/2007-07/msg00469.html (8,667 bytes)
99. Re: [Amps] Tokyo HL-1.5KFX Yaesu pinout (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 30 Jul 2007 10:09:14 -0700; Roger, I pulled out my FT1000MP manual and studied the pinout page for the band data jack. It's difficult to describe, ONLY because the mfr of the plug uses a crazy, illogical numbering scheme for hi; /archives//html/Amps/2007-07/msg00521.html (8,666 bytes)
100. Re: [Amps] qsk (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 25 Aug 2007 04:33:23 -0700; I don't think that's possible without doing something special (or building something). The Titan has its own delay circuit for QSK built in, and it works very well, but you must key the amp and let t; /archives//html/Amps/2007-08/msg00176.html (7,014 bytes)

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