Thaire, Check to make sure PA MODE in the KX3 is set to ON. If still a problem, contact support. 73, Don W3FPR On 3/21/2017 8:43 AM, Thaire Bryant wrote: > I am on Nevis, NA-104, with KX3 es KXPA100. > > Amp will not switch antennas either through KX3 or directly on amp. Any suggestions? > > Tsk es 73 > Thaire. W2APF/V47JR