KPC2.3 I HAVE FOUND WITH RUNNING THE KPC-2 ON HF THAT YOU MUST TAKE THE K-2 JUMPER COMPLETELY OUT OF LINE TO PREVENT "RFing" ON YOUR SIGNAL. I WAS HAVING ALOT OF PROBLEMS WITH THE JUMPER EVEN IN THE "HIGH" POSITION UNTILL I TOOK THE JUMPER COMPLETELY OUT OF LINE TO ALLOW MAXIUM AUDIO OUTPUT TO THE HF RADIO HERE IS A KENWOOD TS-440S. 73' AL KB9BYQ@KA9WPG.#GRB.WI.NA.