Hello all ,
I've just managed to fix my " new to me K2 " ... I had always
thought it was less sensitive than it should be , and a check with an XG3
confirmed it .
The Symptoms .
Low sensitivity
Unable to get satisfactory S meter readings despite checking AGC volts and S Hi
and S Low .
L34 on the RF board didn't have a peak in it .
Low audio out .
All indicating low gain somewhere ..but where ? ! I changed U12 (
MC1350 ) I.F. amp which improved it a bit , but the real culprit was on the SSB
board .
RFC 2 is squeezed in between X7 and RP2 , and the enamel
insulation on RFC2 had been damaged . This resulted in providing a DC path to
earth via the can of X7 ....which played havoc with the voltages on the
switching diodes D6,7,8,9 . Replacing RFC2 resulted in a much livelier RX ,
the S meter works properly and L34 peaks up properly...... life is good .
Whilst doing the DC checks , I couldn't find any reference in the
manual to the expected voltages on Q25 on the RF board ....didn't need them ,
but just wondered if I had missed them somewhere .
73 steve G1MPW
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