[Elecraft] K3 - "Birdies" on P3 that tracks VFO A

[w4sc]

If you are not using the P3 IF OUT port, make sure that the switch (on the back panel) that inserts the 3db splitter is in the OFF position.  I have seen issues with the P3 IF OUT set to ON and no load (other SDR receiver, or TERMINATION) connected.  There is not an isolation buffer between the splitter and the IF OUT port, so there could be an issue with a signal being coupled back into the P3 A-to-D signal path from an external, or internal, source.

I have observed something very similar to the picture you posted with the P3 IN and OUT ports disconnected, but terminated.  The “birdies” drifted back and forth across the P3 display as it warmed up.  I managed to minimize the signals amplitude by following the P3 ribbon and IF cable dressing recommendation, but could not eliminate them.

de Ben W4SC