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1. [Amps] Overdrive protection (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 26 Jul 2012 09:36:00 -0700; Alpha's email newsletter talks about damage to amplifiers as a result of overdrive -- the example is given of amplifiers designed to produce 1500w output with 40w drive being driven with 150w. They s; /archives//html/Amps/2012-07/msg00268.html (7,646 bytes)
2. Re: [Amps] Overdrive protection (score: 1): Author: George <K4GVT@comcast.net>; Date: Thu, 26 Jul 2012 12:47:25 -0400; Vic, my ARD 230A using 3CX800's built in the 80's has this feature. If you drive it a little heavy it'll start warning you and give you a few seconds to stop before shutting down. If you hit it real; /archives//html/Amps/2012-07/msg00269.html (8,336 bytes)
3. Re: [Amps] Overdrive protection (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Thu, 26 Jul 2012 09:48:04 -0700; Or, to play Devils Advocate ... why do they design Amps with such wimpy tubes when more substantial tubes are readily available ?? 73, Dick, W1KSZ _______________________________________________ Amps; /archives//html/Amps/2012-07/msg00270.html (8,166 bytes)
4. Re: [Amps] Overdrive protection (score: 1): Author: "Paul Christensen" <w9ac@arrl.net>; Date: Thu, 26 Jul 2012 13:02:36 -0400; Vic, I believe the firmware already does this, even going back to the 86. In the newer amps, the log is probably there: (1) to assist in troubleshooting and repairs; and (2) to provide Alpha the evid; /archives//html/Amps/2012-07/msg00271.html (9,678 bytes)
5. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 26 Jul 2012 13:36:50 -0400; Why the heck not build in the attenuator so a 100W+ exciter can be used without having to crank it down on every band since many vary per band. National used a swamped grid input tetrode amp in the 6; /archives//html/Amps/2012-07/msg00273.html (9,732 bytes)
6. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 26 Jul 2012 13:37:29 -0400; What is wimpy with those tubes? _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2012-07/msg00274.html (9,756 bytes)
7. Re: [Amps] Overdrive protection (score: 1): Author: donroden@hiwaay.net; Date: Thu, 26 Jul 2012 13:32:49 -0500; Thats a sorry attitude.... How many exciters are rated for 40 watts max ? Don W4DNR _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/; /archives//html/Amps/2012-07/msg00275.html (8,098 bytes)
8. Re: [Amps] Overdrive protection (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 26 Jul 2012 11:49:59 -0700; Perhaps a bad attitude, but I for one appreciate lower drive requirements for high(er) duty-cycle modes. (RTTY, SSTV, AM ...) Let's not give that up for fear of overdrive damage - a front-panel mode; /archives//html/Amps/2012-07/msg00276.html (8,078 bytes)
9. Re: [Amps] Overdrive protection (score: 1): Author: "Joe Subich, W4TV" <lists@subich.com>; Date: Thu, 26 Jul 2012 15:11:11 -0400; Of course there is but such a protection circuit would make the amp almost impossible to use with the many rigs have have a horrendous ALC spike on initial key-down. Many of the most commonly used r; /archives//html/Amps/2012-07/msg00277.html (9,274 bytes)
10. Re: [Amps] Overdrive protection (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Thu, 26 Jul 2012 12:23:22 -0700; Well, this isn't Alpha's problem. They shouldn't have to castrate their protection circuit so that the amplifier can be used with transceivers that are defective. Aren't these spikes themselves dange; /archives//html/Amps/2012-07/msg00279.html (10,038 bytes)
11. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 26 Jul 2012 16:05:52 -0400; Sounds like the input swamping should be disconnected from the tube for 5ms and just act as a dummy load (-; Either that or include a warning "This amp is not suitable for Icom rigs)" Carl KM1H _____; /archives//html/Amps/2012-07/msg00280.html (11,030 bytes)
12. Re: [Amps] Overdrive protection (score: 1): Author: Colin Lamb <k7fm@teleport.com>; Date: Thu, 26 Jul 2012 13:28:50 -0700 (GMT-07:00); Actually, the automatic protection circuit works perfectly with Icom rigs. You drive it with an Icom and it shuts the amplifier down, preventing you from splattering all over the band. What is there; /archives//html/Amps/2012-07/msg00281.html (8,327 bytes)
13. Re: [Amps] Overdrive protection (score: 1): Author: Richard Solomon <dickw1ksz@gmail.com>; Date: Thu, 26 Jul 2012 13:39:23 -0700; Not "all" of us know which they are ... is there a list somewhere of those rigs that exhibit this nasty problem ? Maybe if we boycott those rigs then the manufacturer will modify them. 73, Dick, W1KS; /archives//html/Amps/2012-07/msg00282.html (12,150 bytes)
14. Re: [Amps] Overdrive protection (score: 1): Author: "David Jordan" <wa3gin@comcast.net>; Date: Thu, 26 Jul 2012 16:50:28 -0400; Isn't this a really old concern? I remember having an FT-1000D where I noticed that instantaneous spike on key-down. I noticed in the menu of the Kenwood TS-480SAT you can select the response time of; /archives//html/Amps/2012-07/msg00283.html (9,211 bytes)
15. Re: [Amps] Overdrive protection (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Thu, 26 Jul 2012 16:50:26 -0400; Only one brand that I know of and do all of theirs do that? I never had a problem with my 756 Pro and I believe they are one of those that supposedly have the spike. My FTDX5000MP does not create a s; /archives//html/Amps/2012-07/msg00284.html (10,535 bytes)
16. Re: [Amps] Overdrive protection (score: 1): Author: Mike Tubby <mike@tubby.org>; Date: Thu, 26 Jul 2012 22:47:32 +0100; At the risk of being somewhat controversial ... why are we using ALC these days? I have many radios but currently use an FTDX5000 on 6m and transvert to 2m. None of my tube or solid-state amplifiers; /archives//html/Amps/2012-07/msg00285.html (12,084 bytes)
17. Re: [Amps] Overdrive protection (score: 1): Author: Jim Barber <audioguy@q.com>; Date: Thu, 26 Jul 2012 15:13:41 -0700; I don't see what's controversial about and of that, just common sense. I think the problem is more that people who are thoughtful about the way they operate only occasionally need ALC and other prote; /archives//html/Amps/2012-07/msg00286.html (14,183 bytes)
18. Re: [Amps] Overdrive protection (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Thu, 26 Jul 2012 18:13:17 -0500; I'm not accusing Alpha of anything underhanded, but this kind of bothers me. But I guess in the absence of any hard evidence that they've ever used this to unjustly get around having to replace a tub; /archives//html/Amps/2012-07/msg00287.html (8,197 bytes)
19. Re: [Amps] Overdrive protection (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Thu, 26 Jul 2012 20:17:07 -0400; I havent used ALC since I got rid of the Drake C Lines which were driving a pair of NCL-2000's which were a bit touchy about overdrive in AB1. The replacement TS-930's had adjustable power and intern; /archives//html/Amps/2012-07/msg00288.html (14,622 bytes)
20. Re: [Amps] Overdrive protection (score: 1): Author: "Jim W7RY" <jimw7ry@gmail.com>; Date: Thu, 26 Jul 2012 18:21:49 -0700; My Icom 7600, 751A and IC7200 dont have the problem. The Kenwood TS-830S on the other hand.... 150+ watts on first keyup. 73 Jim W7RY Of course there is but such a protection circuit would make the a; /archives//html/Amps/2012-07/msg00289.html (10,662 bytes)

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