[CQ-Contest] CW keying interface (reed relays)

David Pruett k8cc at comcast.net
Fri Aug 3 01:32:04 EDT 2007

Art Boyars wrote:
> K8CC mentions: "I think I remember N6TR saying that he is now using reed relays ..."
> I think I disdained reed relays back in the 1970's when I saw that they were rated (as I recall) on the order 1-mega-operations mean before failure, and I calculated that a single 48 hour DX contest gave roughly one mega-operation of the relay.  Maybe I was also concerned about the pull-in and drop-out times for QRQ (perhaps a prophetic vision of computer-generated E-E-N-A-4 at 60 WPM).  But I could be wrong, and maybe the relays are better now, and I would surely yield to the superior knowledge, wisdom, and skills of Tree and Dave.
> But it really is neat that the well-known two-transistor "negative keying interface" would actually work for positive, too ... and nobody seems to have discovered it by accident.
> 73, Art K3KU
> (If K3KU is poking his head out, then SS CW must be getting close.)
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That comment came from K6LL/Dave, not K8CC/Dave.


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