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Total 4 documents matching your query.

1. [CQ-Contest] Re CW keying interfaces (score: 1): Author: "jack schuster" <w1wef@att.net>; Date: Wed, 12 Nov 2008 16:47:00 -0500; I have never seen a need for optoisolators and never heard of a transistor failure in hundreds of interfaces I built. KISS! JACK W1WEF (keep it simple...) ____________________________________________; /archives//html/CQ-Contest/2008-11/msg00208.html (6,587 bytes)
2. Re: [CQ-Contest] Re CW keying interfaces (score: 1): Author: "Mark Beckwith" <n5ot@n5ot.com>; Date: Thu, 13 Nov 2008 07:25:00 -0600; Likewise, I've never had a transistorized keying interface fail in 20 years of using them. Mark, N5OT _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.co; /archives//html/CQ-Contest/2008-11/msg00217.html (7,230 bytes)
3. Re: [CQ-Contest] Re CW keying interfaces (score: 1): Author: "Milt, N5IA" <n5ia@zia-connection.com>; Date: Thu, 13 Nov 2008 16:10:16 -0700; DITTO !!!!!!! de Milt, N5IA _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.com http://lists.contesting.com/mailman/listinfo/cq-contest; /archives//html/CQ-Contest/2008-11/msg00222.html (7,856 bytes)
4. Re: [CQ-Contest] Re CW keying interfaces (score: 1): Author: David Pruett <k8cc@comcast.net>; Date: Thu, 13 Nov 2008 19:51:04 -0500; There is a very good reason for using an optoisolator in a CW keying circuit. The circuit which originated (I believe) with K1EA has the keying current return out of the emitter of the NPN transistor; /archives//html/CQ-Contest/2008-11/msg00225.html (11,128 bytes)

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