My Solution........ Buy A Multi Channel Aircraft Radio ( # of Control Channels To Give You What You Want To Do) and Have It Converted To 75MHz.
I Just Had A Good Looking ( Inside And Out ) 72 MHz Futaba 8 Channel Converted To Surface. Works Like A Charm. So, Before You Buy That "Great Radio", Call Tony At Radio South And Ask Him If He Can Do The Conversion For You.
Ok guys, after all that I bought a Tracker III from Mikes Subworks at the regatta here in Indy last August. It works but has a servo buzz on all channels. Mike has been great trying to help me figure out what the problem is. I even got a second receiver from my wife for Christmas that does the same thing. Polk must be busy as heck as they can't return my call. I've tried trying it out in the middle of the yard as well. I've also tried setting the transmitter to a different channel. Does anyone have any other ideas??? Thanks, Jay
P.S. I just found that the only servo that does not buzz with this radio is the one supplied with the radio. Every other servo in my shop buzzed with this radio. Hmm.....How do you return a radio that works great with its own servo?