[Elecraft] RE:MORE CONCISE INFORMATION FOR "HAS ANYONE SEEN THIS"?

[Don Wilhelm]

Jim,
Before blaming the microprocessor, please check the voltages at the gate of
Q4.  This is the actual RX signal from the microprocesor and should be 5
volts during receive.  By contrast, TX at the gate of Q3 should be 0 volts
(or very near that).

If you are showing 5 volts at the gate of Q4, that should turn the 2N7000
JFET on and you should find 0 volts at the source and drain.

Next check the base of Q2 - should be 7.3 volts during receive and the
collector should be at 7.5 volts - emitter at 8 volts.

If you do have 5 volts at the gate of Q4, and 8 volts at the emitter of Q2,
your problem lies in Q2, Q4, or the 2 parts of RP1 that are connected
between them.

73,
Don W3FPR

----- Original Message ----- 

> Here is what I have been able to verify.
> 8R (8.0 VOLTS TO THE RECEIVER SECTION IS BEING TURNED OFF BY THE MCU
> IMMEDIATELY UPON COMPLETION OF THE ELECRAFT MESSAGE ON POWER UP. You hear
a
> brief burst of atmospheric noise then the reciever goes quiet.