I have made an adapter cable for connecting my several ICOM mics to my K3 and they all work well. I have a Heil GM-4/5 "Goldline" desk mic and I have an uneasy feeling that it doesn't have enough output to adequately drive the K3. Is anyone using this mic with a K3 that can confirm my suspicion? 73! Ken Kopp - K0PP k0pp at arrl.net or k0pp at acninc.net