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Total 9 documents matching your query.

1. [Amps] Vacuum Relay Issues (score: 1): Author: "K5RC" <tom@k5rc.cc>; Date: Mon, 1 Dec 2008 09:33:58 -0800; I use Emtron DX-4 amps in my contest station. I chose them to ensure my guest ops do not blow them up. They have excellent fail-safe protection. One by one, however, I am having problems with the vac; /archives//html/Amps/2008-12/msg00010.html (7,775 bytes)
2. Re: [Amps] Vacuum Relay Issues (score: 1): Author: Vic K2VCO <vic@rakefet.com>; Date: Mon, 01 Dec 2008 09:48:08 -0800; Hi Tom, They always seem to fail this way. You should (probably already have?) checked for hot-switching. Make sure the time between the amp-out signal from the exciters and the onset of RF is long e; /archives//html/Amps/2008-12/msg00011.html (8,521 bytes)
3. Re: [Amps] Vacuum Relay Issues (score: 1): Author: "Dave Harmon" <k6xyz@sbcglobal.net>; Date: Mon, 1 Dec 2008 11:51:17 -0600; I installed a Jennings in my 3K-A back in 80' and never have had any trouble with it. Regards Dave Harmon CCA 97-535 Midwestern Collins K6XYZ[at]sbcglobal[dot]net Sperry, Ok. I use Emtron DX-4 amps i; /archives//html/Amps/2008-12/msg00012.html (8,589 bytes)
4. Re: [Amps] Vacuum Relay Issues (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 01 Dec 2008 09:52:23 -0800; Hi Tom, This is a common failure mode. I have the same problem with the relays in my Ten Tec Titan amps. Original equipment was Jennings, I've used some Jennings parts that are supposedly new pulls f; /archives//html/Amps/2008-12/msg00013.html (7,175 bytes)
5. Re: [Amps] Vacuum Relay Issues (score: 1): Author: "Mike Schatzberg" <cherokeehillfarm@earthlink.net>; Date: Mon, 01 Dec 2008 13:13:14 -0500; Hello Tom: I would agree with Vic that hot switching is a potential cause for contact failure in relays. It is possible that the Emtron circuit is not properly designed, and this is a root cause of t; /archives//html/Amps/2008-12/msg00015.html (10,965 bytes)
6. Re: [Amps] Vacuum Relay Issues (score: 1): Author: "David Cutter" <d.cutter@ntlworld.com>; Date: Mon, 01 Dec 2008 10:45:59 -0800; I've cured problems similar to this with mechanical switches by running a small dc current thro the contacts from a 12V source. It would tricky to do this with rf involved, an isolated supply for a s; /archives//html/Amps/2008-12/msg00017.html (8,594 bytes)
7. Re: [Amps] Vacuum Relay Issues (score: 1): Author: Rick Stealey <rstealey@hotmail.com>; Date: Tue, 2 Dec 2008 03:00:16 +0000; Tom, I don't completely understand either, what the others have said as to why the receive contacts would be intermittent, even if there was a sequencing problem, because it's a different set of cont; /archives//html/Amps/2008-12/msg00024.html (8,858 bytes)
8. Re: [Amps] Vacuum Relay Issues (score: 1): Author: "jerome schatten" <romers@shaw.ca>; Date: Mon, 01 Dec 2008 19:32:58 -0800; [...] It's sad but true, the Pro3 does NOT have a QSK delay control to delay the RF envelope. Does your QSK delay work if you're not using the internal keyer in the FT1000? It doesn't on my FT920. Je; /archives//html/Amps/2008-12/msg00027.html (8,835 bytes)
9. Re: [Amps] Vacuum Relay Issues (score: 1): Author: "Nils P. Pedersen" <nils.pedersen@tele2.no>; Date: Tue, 2 Dec 2008 17:50:18 +0100; Trying to resend this...for some reason it bounced : Interesting... I see from several relay manufacturers specs that they actually give a minimum contact current for reliable operation. This varies; /archives//html/Amps/2008-12/msg00038.html (9,521 bytes)

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