has anyone used a rigblaster with an older ten tec like a 540? I'm wondering about the microphone plug being 3 conductor and the high impedance needed for the radio. Larry N1SHM -- FAQ on WWW: http://www.contesting.com/FAQ/tentec Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com