>
>Gerard M0AIU/AA3ES wrote:
>
>> hope you are not into CW contesting. A vacuum relay has a life of
>>about 2 million operations. A serious CW contester will wear it out in 6
>>days! And that is when the relay was purchased new.
Anybody who sends 2 million dits and dahs in 6 days is destined for the
nut-house. If you need longer contact life, purchase the (tungsten
contact) RJ-1H instead of the RJ-!A
>
>I have been using some RF1 vacuum relays for switching the amp available a
>few years back here at all the hamfests at about $7-50 each, new. (You can
>tell we're not in Nebraska!)
amen
>They were arranged so that the bias doesn't
>come off the grid until the output relay has gone over: they are energised
>for receive. I do not run QSK, but got a strange effect that received
>signals would all go T4, and the received signal levels would drop. Tapping
>the relay with a pencil would restore things.
This is most likely due to residual magnetism in the armature . The
usual fix is to reverse the wires to the relay coil.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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