Yesterday I posted about extremely low receiver sensitivity on my K3, at both
the main antenna input and the receive input on the KXV3 module.
A buddy helped me this morning and we found the problem.
In doing the circuit diagnosis, and we are both somewhat experienced in
technical matters, we became very frustrated with the Elecraft schematics. We
found it very hard to signal trace through all the plugs and jacks. Signal
points seem to end with a label, with no indication of where that label
reappears. And although we found the problem it wasn't because we had the info
we needed. For example, we never did find a schematic of the KXV3 module. It
isn't in with the installation docs for the module, and if it is in among the
K3 schematics it must be disguised somewhere.
We found it was effective to take a probe from the signal generator and inject
it at various points, looking at the IF output on a spectrum analyzer. But we
had to do some guessing. Like is there really an amplifier on the IF output in
the KXV3 like the block diagram shows? I don't think so.
Thanks to all who offered helpful suggestions. They were all via email - you
notice there were no helpful postings on the reflector. Anyway, it's working
again and I'm a happy camper.
Rick K2XT
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