We tried using a Flex 6400 at G3PYE for the #rsgb 80m SSB contest a couple of weeks ago for the first time - only to find no audio from the headset mic.
Two headsets, same problem. Headset on the Elecraft K3 worked fine.
Just found the issue: Sennheiser connect tip to ring on the mic jack. Flex connect ring to shield on the mic socket.
Solved with a short adaptor cable which I must now try not to loose before the next contest... #hamr


