[Elecraft] KXPA100 RF feedback

[E T]

Today my KXPA100 stopped working properly.  Whenever I transmit I start getting feedback, a sort of electric stuttering effect.  When the amp is bypassed this does not occur.  Also, if I transmit into a dummy load the problem does not occur, indicating that somehow the antenna RF must be affecting the amp in some way?

Nothing has changed in my shack since yesterday, and the problem occurs with both my KX3 and KX2, so it's not the radio.  Everything is fully grounded to a copper bus bar on my desk.  I performed the factory reset through the KXPA Utility with no change.

Has anyone had this happen?


  Thanks and 73,
  Erik Tkal  -  W1QED