Ian White GM3SEK wrote:
That is correct. Attempting to switch 120V AC will damage the K3, and an
intermediate relay will add even more delay.
<snip>
Amplifiers that require high-voltage, AC or negative switching are 30
years behind the times. If the owner wishes to use the amplifier with a
modern transceiver, I think it's clearly his responsibility to bring the
switching interface up to date. Every design is different, but
modifications are out there on the web, and none of them should take
more than an evening's work.
I agree. One simple modification that you can make without changing the
relay is to provide a 28-30 volt DC source in the amplifier. This will
operate a 120 volt AC relay reliably (and may make it quieter, too).
The K3's switching circuit will handle 30vdc easily. Of course, you
still have to determine the delay needed.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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