Chris, You can buy a kit from Elecraft (AMP-KEY) or build one from your junkbox parts - go to www.elecraft.com and search for 'amplifier keying' to see it. 73, Don W3FPR ----- Original Message ----- | Can the K2 be configured/modified to provide PTT switching of TX/RX for an | external linear amp? (by providing path to earth). |