I'm in the process of restoring a Tempo 2020 (Uniden 2020). I have
everything working again, but there is one small bug left to swat.
When listening to the receiver I hear a slight gurgle or blip every
few seconds in the receive audio and in the transmitted signal.
I took a general coverage receiver and zero beat the different IF
frequencies in the receiver. All the IF carriers are gurgle free
except the 6.x MHz IF signal generated by the PLL board. The gurgle
or blips in the IF signal generated by the PLL board match the ones I
hear in the receive audio in both time of occurrence and sound. It is
not constant, but it may happen three of four times within five
seconds.
I tapped around the circuit board with a pencil, and noticed a
similar noise when I tapped around resistor R812 and C815. I replaced
those two parts, but it did not make any difference. D807 (part #
mv201) is a varactor diode in the same vicinity, and I'm suspicious of
it. Any helpful suggestions would be appreciated

There is a schematic of the Tempo 2020 PLL board on-line at;

http://www.shadowstorm.com/cb/schema...-pll-board.jpg.

Thanks,

-Rea