No, it’s the multi-core cable with a 15 pin plug on each end. Check Page 5 of the KAT500 manual. 73, Alan - G4GNX South Coast UK Elecraft K4D / KPA500 / KAT500 / IC-9700 > On 4 Nov 2023, at 21:50, Jim Cary <jimlcary at gmail.com> wrote: > > The Aux i/o is the one with phono type plug on the end, correct? >