Thanks as always, Jim.?
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I should be able to bypass all of the fixed passband values from the PS board (at least on RX) by using the PBT control.?
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Same problem; the PBT control does not alter the 5.645MHz signal. I've tried shotgunning in a spare PBT board with no change. The unit "receives" but it's what you'd expect with the passband being off-center.?
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This is a strange one; it's almost like the +10V has lost ground reference to the PBT board. The PBT control is just a voltage divider between +10V and gnd and the signal into the PBT board never goes below about +7.5V.?
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Craig/W8CS
Greenville, SC
Craig W8CS