Do NOT send in just the sub! (also an intermittent will invariably NOT
fail when here at Elecraft).
Like Jack said, check the sub KSYN3 by tapping DISP and look for PL2
voltages or SYN2 OK (tech mode must be on). When wiggling all the
cables, don't forget the one at the back of the sub. Look for green LED
if you have the newer KSYN3A.
BUT if it works on some bands, and not others, it points to the KSYN3 if
older, run the VCO cal *on the sub receiver* if you have the old KSYN3
(shows PL2 voltages vs SYN2). (a BPF or LPF problem would be by band
"pairs", not the whole range below 20M).
When "quiet" is it just low sensitivity? Or dead completely?
Is it dead on BOTH antenna inputs to the sub, IE Aux and Main sharing?
Toggle back and forth repeatedly.
When dead, does toggling JUST the SUB on and off fix it?
Keith WE6R Elecraft K3 Tech.
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