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1. Re: [Amps] AM7223 military amp (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 01 Nov 2009 16:37:58 -0500; Or better yet, start by googling "AM 7223 amplifier" - lots of hits 73, Pete N4ZR New Articles Daily - the Contesting Compendium at http://wiki.contesting.com The World Contest Station Database, upda; /archives//html/Amps/2009-11/msg00009.html (9,207 bytes)
2. Re: [Amps] LK-500-NTC v. SB-220 v. Clipperrton L (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Mon, 05 Oct 2009 16:49:13 -0400; 73, Pete N4ZR New Articles Daily - the Contesting Compendium at http://wiki.contesting.com The World Contest Station Database, updated daily at www.conteststations.com The Reverse Beacon Network at; /archives//html/Amps/2009-10/msg00108.html (10,310 bytes)
3. Re: [Amps] Silver Plating Tank Coil ?? (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 20 Sep 2009 09:45:50 -0400; Shhh ... what if this gets out? Imagine all the audio cable manufacturers whose livelihood you will threaten. 73, Pete N4ZR New Articles Daily - the Contesting Compendium at http://wiki.contesting.co; /archives//html/Amps/2009-09/msg00255.html (8,573 bytes)
4. Re: [Amps] Amplifier scenario question (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 17 Sep 2009 10:14:12 -0400; The older VFD wattmeter also has a VSWR alarm that lights an LED, and they had an add-in kit to provide a relay. Homebrewing the relay circuitry would be quite easy. 73, Pete N4ZR New Articles Daily; /archives//html/Amps/2009-09/msg00231.html (9,061 bytes)
5. [Amps] Tuning the SB-220 was: Re: SB-220 bias question (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Sat, 29 Aug 2009 10:16:34 -0400; I have had my SB-220 for about 10 years. It was meticulously built by a real old-timer. One of its true beauties is the relatively forgiving tuning - by putting index card behind the two capacitor kn; /archives//html/Amps/2009-08/msg00596.html (11,994 bytes)
6. Re: [Amps] Carbon film or metal oxide film resistors for low-power RF circuits? (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Sun, 16 Aug 2009 08:53:12 -0400; The eraser on the end of a pencil also works well, if you have contrived a way to hold the PC board stably. I find tweezers are lamentably prone to launching SMT parts into low earth orbit, never to; /archives//html/Amps/2009-08/msg00326.html (15,486 bytes)
7. [Amps] W8JI (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 05 Jul 2009 16:05:22 -0400; Mention of Tom reminds me - I wrote to him a couple of weeks ago, and have not had a reply. Before I bug him with a follow-up, does anyone know whether he's out traveling or otherwise unable to respo; /archives//html/Amps/2009-07/msg00118.html (6,747 bytes)
8. Re: [Amps] Checking relay timing with a scope (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 21 Jun 2009 11:14:33 -0400; It is dual trace, and it has choice of internal or external triggering. 73, Pete N4ZR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com; /archives//html/Amps/2009-06/msg00088.html (8,878 bytes)
9. [Amps] Checking relay timing with a scope (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 20 Jun 2009 15:52:10 -0400; I've only been doing this ham radio thing for 55 years, but until this year I never owned or even used an oscilloscope. I now have an old 15-MHz dual trace machine that works fine, and I'm trying to; /archives//html/Amps/2009-06/msg00083.html (6,951 bytes)
10. Re: [Amps] 50 MHz QSK relays for converted SB-220 (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 10 May 2009 17:21:28 -0400; I think the same really goes for the Kilovac equivalent. At least we both have a spare set of contacts ;^) 73, Pete _______________________________________________ Amps mailing list Amps@contesting.c; /archives//html/Amps/2009-05/msg00054.html (8,129 bytes)
11. Re: [Amps] High SWR, (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 23 Apr 2009 06:34:06 -0400; Carl occasionally goes too far, but he also has forgotten more about amps (from a practical and repair perspective, especially) than most of us will ever learn. He's a valuable resource, and it would; /archives//html/Amps/2009-04/msg00243.html (12,713 bytes)
12. Re: [Amps] High SWR (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Wed, 22 Apr 2009 17:39:22 -0400; Jeff, there's a huge difference between being conservative - a good thing, usually - and forgoing significant benefit because of a misconception. I love my SB-220 too, and I try very hard not to do d; /archives//html/Amps/2009-04/msg00217.html (10,371 bytes)
13. Re: [Amps] High SWR was SB-1000 tuning question (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Wed, 22 Apr 2009 16:54:53 -0400; You are missing out on a lot by limiting yourself this way, because the SB-220 is a great active antenna tuner. I routinely use mine on antennas cut for the low end of 80M up in what used to be calle; /archives//html/Amps/2009-04/msg00215.html (10,526 bytes)
14. Re: [Amps] item that was for sale good luck shipping (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 15 Mar 2009 12:03:33 -0400; Doesn't matter if it's good science or not, if you ship the stuff without declaring it as PCBs, you could get burned legally, and if you do declare I doubt they will let you. 73, Pete N4ZR __________; /archives//html/Amps/2009-03/msg00420.html (11,962 bytes)
15. Re: [Amps] Open Reply to Steve Cook (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 28 Feb 2009 15:42:42 -0500; Will someone please get Steve to sit down and be quiet? 73, Pete N4ZR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinf; /archives//html/Amps/2009-02/msg00738.html (11,093 bytes)
16. [Amps] Parasitic suppressor resistors - think film OK? (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 28 Feb 2009 06:09:53 -0500; Would thick film power resistors as made by Caddock, Ohmite et al, be acceptable in parasitic suppressor service at HF. They are billed as "very low inductance". The TO-220 case would require a diffe; /archives//html/Amps/2009-02/msg00706.html (6,701 bytes)
17. [Amps] Harris amps (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Thu, 19 Feb 2009 10:26:11 -0500; I am interested in possibly obtaining one of the Harris amps in the RF-10x series. I have heard of people having great results with the RF-102A in amateur service, at full amateur power, including co; /archives//html/Amps/2009-02/msg00558.html (6,931 bytes)
18. Re: [Amps] SB-220 troubles (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Fri, 13 Feb 2009 06:32:41 -0500; OK, here's an interesting design exercise - we need an interlock that *does* protect the operator and "doesn't* kill the power supply. How would you do it? Or can it be done? Otherwise, I'm inclined; /archives//html/Amps/2009-02/msg00407.html (8,387 bytes)
19. [Amps] The SB-220 Mystique (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Tue, 10 Feb 2009 13:32:24 -0500; A couple of things occur to me to explain their continuing popularity: -- tubes are instant-on, almost immortal, and not that expensive to replace. -- tank circuit is capable of matching fairly sever; /archives//html/Amps/2009-02/msg00274.html (6,569 bytes)
20. Re: [Amps] SB-220's, 3-500's, some history (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 07 Feb 2009 06:57:18 -0500; FWIW, W8JI said that early SB-220s had closer-spaced tuning caps, so if any arcing was to occur it would happen there. Later model 220s and 221s, he said, had wider tune cap spacing, which made the b; /archives//html/Amps/2009-02/msg00172.html (24,643 bytes)

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