Stefan,
You have not only the K3 in the receive path, but also the transverter,
coax, and perhaps a sequencer.
Have you tried changing the coax to the transverter IN jack?
Often problems of that nature are caused by faulty coax.
Have you ruled out a bad contact in your transverter or other external
switching?
Does the K3 receive at your IF frequency if an antenna is connected to
the SO-239 jack?
If you have an alternate source of 28 MHz signal (signal generator or an
antenna that will receive even noise on 28 MHz), try connecting that to
the K3 transverter input to see if the problem is in the K3 or something
external.
73,
Don W3FPR
On 5/24/2014 4:42 AM, Stefan Heck wrote:
Hi gents,
Since fall 2011 I am happy to own the basic version of the K3, with the only
extras being the KXV3A transverter interface, some CW filter and the KDVR3
voice recorder. I have been using the K3 once or twice each month only as IF
unit for a 2 m XVTR. So I am not using the SO-239 rear socket. The K3 worked
very fine for almost 2 years but started then to exhibit intermittent
drop-outs of the RX signal. The path was not completely gone, just had extra
attenuation of 30-40 dB. Transmission seemed never affected. Initially it
resembled a hanging contact of a T/R-relay, and could be cured by pushing
the PTT once or twice.
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