Bob, is "KXPA100" the product name of the "new 100 watt amp"? Or, did you mean to clarify the KPA100 option to the K2 and inserted the "X" by mistake? Stan WB2LQF On Thu, May 19, 2011 at 8:32 PM, Robert Friess wrote: The new KXPA100 will work with any radio that provides 5 watts of RF and a Key out line. It does not require AuxBuss. Bob, N6CM