I know some people that have done it successfully, it was on UHF/VHF radios, I can see where there could be RF problems on HF though. I wouldn't do it but I know people that have. ----- Original Message ----- From: "Howard Kaufman" <[log in to unmask]> To: <[log in to unmask]> Sent: Friday, February 11, 2005 12:51 AM Subject: Re: Kenwood H F Transceiver; > No, the standard rj45 doesn't have enough shielding for a mike extension, > I > tried it. >