I just tried another test, which I think tends to confirm my theory in some way
(or that something is amiss). When I apply my 0.5 mW 146 MHz test source to
the XVTR OUT jack, the DC voltage at the cathode of D3 in the K60XV (the
detector for VRFDET) increases from zero to about 0.1 volts. So I put together
a resistor network, which when powered from a 12V battery produced this same DC
voltage, and applied this DC voltage to the cathode of D3, with no RF input
signals at all present. The same symptoms were observed (KEY OUT is keyed,
receiver goes quiet and S-meter goes to maximum).
73,
Steve VE3SMA
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