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1. Re: [Amps] Plate choke resonanse and safe operation (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Sun, 7 Dec 2008 11:51:24 -0800; 10 years or more ago I remember seeing an article about modifying a pre WARC Alpha linear to work on those bands. The problem was the RFC resonance. He moved it by installing a loosely coupled single; /archives//html/Amps/2008-12/msg00148.html (8,784 bytes)
2. Re: [Amps] TL-922 (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Sun, 7 Dec 2008 17:08:05 -0800; I believe it is on Rich Measures page. 73, Dan, N5AR hi, anyone have the detailed mods to convert the TL-922 to 10 meters? need to convert one for a Mexican ham friend. 73, larry n7dd **Make your lif; /archives//html/Amps/2008-12/msg00158.html (7,288 bytes)
3. Re: [Amps] Input impedance of pair 3-500z's in GG (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Sun, 14 Dec 2008 09:09:47 -0800; There are a number of reasons to use a tuned input. One is reduced IMD distortion and there several others. Open any Radio Amateurs Handbook to the RF Power Amp chapter and you will see a good discus; /archives//html/Amps/2008-12/msg00225.html (11,272 bytes)
4. [Amps] High Voltage Wire (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Tue, 23 Dec 2008 08:27:36 -0800; One of my amps uses spark plug wire inside of shield braid. It has excellent HV insulation plus the protection of a grounded braid covering. In addition it is flexible and easy to terminate. Much bet; /archives//html/Amps/2008-12/msg00307.html (7,135 bytes)
5. Re: [Amps] Shaft Misalignment Solutions (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Thu, 22 Jan 2009 19:09:51 -0800; Bob, I have picked up many parts of this type in flea markets for almost nothing., They came from dismantled printers,. You can probably get a free printer to take apart if you ask at your next club; /archives//html/Amps/2009-01/msg00260.html (9,098 bytes)
6. Re: [Amps] Alpha 77Dx Filament - No Free Lunch (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Fri, 23 Jan 2009 11:42:05 -0800; Paul, a number of years back I installed a couple of mobile rigs in my car. The power leads were fused using the screw in type holders used in our radio gear. I measured the voltage drop in the holde; /archives//html/Amps/2009-01/msg00273.html (9,682 bytes)
7. [Amps] Antenna tuners (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Mon, 16 Feb 2009 15:14:34 -0800; ARRL did a rather thorough test of a number of commercial tuners several years ago. They tested them on 160-10m and with loads well below and above 50 ohms. I recall that several were extremely lossy; /archives//html/Amps/2009-02/msg00527.html (6,689 bytes)
8. Re: [Amps] house cleaning AMP parts for sale (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Sun, 1 Mar 2009 07:37:44 -0800; It works fine for me Eddy. 73, Dan, N5AR -- _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-03/msg00011.html (12,399 bytes)
9. Re: [Amps] KiloVac HC4 Relays (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Sat, 7 Mar 2009 18:46:59 -0800; I have owned an HC4 relay for a number of years. I just checked it on my 9kv hi pot tester and it shows only 2 microaamps leakage at 9kv. That is as low as the best of my other vac relays and better; /archives//html/Amps/2009-03/msg00237.html (8,734 bytes)
10. Re: [Amps] Switch needed for Amp Supply LK series amp (score: 1): Author: "Dan Hearn" <n5ar@air-pipe.com>; Date: Thu, 12 Mar 2009 10:08:27 -0700; Check Allelectronics. They have many pages of switches at reasonable prices plus many other goodies. 73, Dan, N5AR -- _______________________________________________ Amps mailing list Amps@contesting; /archives//html/Amps/2009-03/msg00346.html (8,662 bytes)
11. Re: [Amps] Fw: High SWR (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Sat, 25 Apr 2009 09:32:06 -0700; Gary, I believe K9YC has the best designs for building your own sleeve baluns. The best available commercial baluns are those from DX Engineering IMO. If you would like a good summary of the balun si; /archives//html/Amps/2009-04/msg00343.html (7,690 bytes)
12. Re: [Amps] Sorry - another question about 'odd parts' (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Mon, 08 Jun 2009 16:35:47 -0700; The old mercury vapor rectifiers 866 use 2 1/2 volt filaments? Could be that. 73, Dan, N5AR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesti; /archives//html/Amps/2009-06/msg00034.html (7,990 bytes)
13. Re: [Amps] Input SWR (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Fri, 11 Sep 2009 18:44:46 -0700; I believe you are correct Tomas. The amps I have used do not usually show a very low input SWR over the entire band, particularly the wider bands. 73, Dan, N5AR ______________________________________; /archives//html/Amps/2009-09/msg00161.html (7,407 bytes)
14. Re: [Amps] PSU design question (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Sat, 07 Nov 2009 08:56:39 -0800; Ulf. you connect a resistor in series with the meter not in shunt with it. The resistor is a value which will give the correct meter deflection for the plate current. 73, Dan, N5AR __________________; /archives//html/Amps/2009-11/msg00106.html (9,701 bytes)
15. [Amps] 8877 date codes (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Fri, 15 Jan 2010 14:01:08 -0800; A quick archive search for 8877 bad date codes found all sorts of information. One post by G3RZP seems to have a good summary of the problem. Here it is: "Here's a copy of what I was sent on the subj; /archives//html/Amps/2010-01/msg00212.html (8,095 bytes)
16. Re: [Amps] Source for large purchase of toroids? (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Sat, 23 Jan 2010 12:10:12 -0800; I just purchased $450 worth of Fair-Rite parts last week for our club. I checked prices at Newark, Mouser,and Allied. Two weeks ago Allied had lower prices than the others. Suddenly when I was ready; /archives//html/Amps/2010-01/msg00291.html (10,497 bytes)
17. Re: [Amps] 120 cycle hum from Henry 2K-4 (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Thu, 18 Feb 2010 18:31:28 -0800; There is a good discussion of the power supply in the 2K4 here about half way down. http://www.qsl.net/i0jx/supply.html 73, Dan, N5AR _______________________________________________ Amps mailing list; /archives//html/Amps/2010-02/msg00539.html (12,725 bytes)
18. [Amps] KW Dummy Load Resistors (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Fri, 19 Feb 2010 13:54:56 -0800; I have an unused Carborundum non inductive resistor 891SP 50 ohms +10-5 %. It is 2"x 18". I am trying to figure what it is worth and would appreciate any opinions. 73, Dan, N5AR _____________________; /archives//html/Amps/2010-02/msg00575.html (6,936 bytes)
19. [Amps] keyers heath HD-1410, ham keyer HK5A (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Wed, 10 Mar 2010 13:06:23 -0800; I picked up these 2 keyers at a ham sale. They seem to work OK, however, the outputs are obviously not a simple open circuit/short circuit like a relay. I assume they are some sort of transistor swit; /archives//html/Amps/2010-03/msg00169.html (6,640 bytes)
20. Re: [Amps] Revamping a really ugly amp (score: 1): Author: Dan <n5ar@air-pipe.com>; Date: Sat, 13 Mar 2010 19:25:02 -0800; SPST latching relays are available from MGS4U for $15. Dan, N5AR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amp; /archives//html/Amps/2010-03/msg00241.html (13,696 bytes)

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