The P3 (not the PX3) can be used with either the K3 or K3S. The P3 has an IF input, but the PX3 has IQ (audio) inputs. 73, Don W3FPR On 9/24/2024 4:56 PM, Michael Needham wrote: > Can someone enlighten me ,can a PX3 be used with a K3 (just a regular K3 > not the s verson just one stage below the s ) ? > >