[Elecraft] K3 and sticking amp T/R relay
Gary Smith
Gary at ka1j.com
Sun Oct 28 16:09:25 EDT 2012
My newly acquired 30 year old amp comes with QSK. As there was a
different relay than came stock I have to assume the circuitry may
have been altered in the past. I have no way to know this.
After two weeks of normal amp behavior I found the T/R vacuum relay
had locked in the transmit position. A gentle tap on the NO terminal
released it and function is back to normal. Mostly normal as I do
find the ALC idiot light is no longer illuminating and the grid
metering response appears attenuated but the amplifier puts out full
power with absolutely no difficulty in that 35W drive gives 1500 out
to the LP-100A watt meter.
My question for here is; if the amp is not properly sequencing with
the K3, what setting can I change within the K3 to provide more time
for the amp's relays to close before the K3 transmits? I remember
there was a feature to allow ms changes for QSK in the K3. How do I
find that option? And should I decrease the MS time in the K3 or
increase it to let the perhaps relay in the amp have time to close
first to avoid hot switching?
Thanks,
Gary
KA1J
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