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1. [Amps] Odd modifications in AL-80A (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sun, 24 Jul 2005 16:42:25 -0400; I just bought an AL-80A amplifier from an estate. The amp appears to be OK and working, but certainly in need of a little bit of TLC. I found the cover on backwards and only eight of the thirteen scr; /archives//html/Amps/2005-08/msg00000.html (7,110 bytes)
2. [Amps] AL-80A "spitting" on 80m, Relay problems. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sun, 11 Sep 2005 20:54:36 -0400; I used my AL-80A during the recent NA Sprint. I found that when I went to 80m, it was difficult to tune to more than 300 watts without exceeding 150 ma of grid current. After a few minutes, I also he; /archives//html/Amps/2005-09/msg00095.html (7,144 bytes)
3. Re: [Amps] AL-80A "spitting" on 80m, Relay problems. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 12 Sep 2005 22:53:28 -0400; I'll check this. Mr. Measures suggested reversing the coil wires -- I'm not sure what good that would do, unless the relay frame has become permanently magnetized.... Some one else warned me that I m; /archives//html/Amps/2005-09/msg00107.html (8,502 bytes)
4. Re: [Amps] AL-80A "spitting" on 80m, Relay problems. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Wed, 14 Sep 2005 23:06:56 -0400; I resolved the "spitting" problem. After carefully tuning up the amp for 80m, using as little loading C as possible to get the maximum output, there was no spitting into the dummy load. Then I switch; /archives//html/Amps/2005-09/msg00125.html (8,712 bytes)
5. Re: [Amps] AL-80A "spitting" on 80m, Relay problems. (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 19 Sep 2005 21:47:21 -0400; About 1/8" between plates. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbur Wright, 1901 ___________________________________________; /archives//html/Amps/2005-09/msg00233.html (8,468 bytes)
6. Re: [Amps] Alpha releases New Amp 9500 (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 20 Sep 2005 21:24:14 -0400; "Very soon" is right now. Apple introduced the original iMac in 1998, and it had no RS-232 ports. That got the USB ball rolling, since the only way to add peripherals was through USB. Apple hasn't ma; /archives//html/Amps/2005-09/msg00246.html (9,887 bytes)
7. Re: [Amps] Alpha releases New Amp 9500 (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Wed, 21 Sep 2005 23:15:13 -0400; My whole point is -- if you've been buying Apple products - the legacy ports have been gone for years now. PC manufacturers are just now starting to catch up. These certainly work, and I can recommen; /archives//html/Amps/2005-09/msg00282.html (10,561 bytes)
8. Re: [Amps] AC wiring (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 14 Oct 2005 20:09:14 -0400; Certainly not true. If anything, the 220 wiring can be smaller. Although, these days, I doubt anyone is seeing 220, more like 240. However, with 110, the I^2R losses in the wiring are quadrupled. 220; /archives//html/Amps/2005-10/msg00393.html (8,544 bytes)
9. Re: [Amps] AC wiring (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 18 Oct 2005 20:21:39 -0400; Seems to me that 12.3 A and 13.4 A are both less than 15 A. So a #14 circuit seems adequate for your example. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years wil; /archives//html/Amps/2005-10/msg00450.html (9,023 bytes)
10. Re: [Amps] Aluminum alloys for panels? (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Tue, 15 Nov 2005 18:01:11 -0500; I would guess that most are 2024-T3. 0.125 inch ought to be plenty strong for many applications. Even better if you can find 2024 Alclad. Seems like the 5000 series aluminum is typically softer than; /archives//html/Amps/2005-11/msg00194.html (8,151 bytes)
11. Re: [Amps] Real Difference (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 23 Dec 2005 15:13:46 -0500; The AL-80A and B are similar designs using a single 3-500Z. The AL-80A is an older, conventional design. The AL-80B is an updated design using a sophisticated bias arrangement and more easily massass; /archives//html/Amps/2005-12/msg00312.html (7,039 bytes)
12. [Amps] AL-80A - fighting with the relay again (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Wed, 11 Jan 2006 21:06:19 -0500; I'm using an AL-80A with an Elecraft K2/100. I recently operated the RTTY Roundup running about 300-400 watts out. Intermittently, when the AL-80A would unkey, the received signal strength would be r; /archives//html/Amps/2006-01/msg00350.html (7,911 bytes)
13. Re: [Amps] AL-80A Relay troubles (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Thu, 12 Jan 2006 21:25:02 -0500; Thanks, Joe. I'll try the burnishing with a business card trick first, and then consider replacement. I looked hard on the Ameritron site, but I was not able to find any quotes for the changeover rel; /archives//html/Amps/2006-01/msg00361.html (8,060 bytes)
14. Re: [Amps] AL-80A - fighting with the relay again (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Wed, 1 Feb 2006 22:18:22 -0500; This appears to have been my problem. I finally got the AL-80A off the shelf and opened it up. I used a bit of freon-based solvent (yes, I still have some...) and followed up with an old white vellum; /archives//html/Amps/2006-02/msg00017.html (7,188 bytes)
15. Re: [Amps] FW: RFI Question (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 6 Feb 2006 23:00:40 -0500; Yup! And the stuff actually worked, too. I used some sprayed on the inside of a WYSE terminal in order to reduce the RFI from that unit. Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not; /archives//html/Amps/2006-02/msg00148.html (8,252 bytes)
16. Re: [Amps] RE : who needs it? Henry 8K (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Wed, 24 May 2006 23:16:20 -0400; This is an interesting comparison. I'm sure a large number of people exceed posted highway speed limits by 10%. Perhaps even 20%. But does anyone other than a complete nut exceed those speeds by 50%?; /archives//html/Amps/2006-05/msg00348.html (10,009 bytes)
17. Re: [Amps] RE : who needs it? Henry 8K (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Thu, 25 May 2006 06:43:02 -0400; "The best diplomat I know is a fully activated phaser bank." -- Star Trek's "Scotty" Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within a thousand years will man ever fly!" -- Wilbu; /archives//html/Amps/2006-05/msg00349.html (8,971 bytes)
18. Re: [Amps] 4-1000 amp (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sun, 28 May 2006 19:15:23 -0400; Curious question -- I recently wondered why it is that the 3-1000Z was never that popular a tube in amateur circles, but the 3-500Z was. Why did many amateur designs use two 3-500Zs instead of one 3-; /archives//html/Amps/2006-05/msg00461.html (7,123 bytes)
19. Re: [Amps] LK-500 problem (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Mon, 29 May 2006 08:04:41 -0400; I bought an AL-80A last year from an estate and had a similar problem - HV read about 2200 volts instead of nearly 3000. The advice I received was that the HV power supply is pretty deadsimple, and i; /archives//html/Amps/2006-05/msg00485.html (8,106 bytes)
20. Re: [Amps] R. MEASURES PRAYERS ANSWERED (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Sun, 4 Jun 2006 22:45:15 -0400; Dummy loads are resonant by definition, since they provide a purely resistive impedance. (ie X = 0 is the definition of resonance) Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net Quote: "Not within; /archives//html/Amps/2006-06/msg00110.html (9,193 bytes)

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