If you are capable of building an adapter for the MH3 plug to the K2's 8 pin Foster connector than the answer is "yes" I do not believe any pre-built adapters exist. 73, Don W3FPR On 9/13/2012 4:24 AM, List wrote: > Hi, > is it possible to use the MH3 for my 'old' K2 too? > > vy 73 de > Karl-Heinz, DK5LP / AK5LP > K2 #2583, KX3 #443 >