Woody, KJ4SO wrote "According to my IC-756 Pro II manual, and the 'CI-V Baud Rate' menu on the radio, the only two choices for the CI-V address is 64h & 7Fh. " '100' does not appear to be a valid CI-V address for any Icom radio that I can find." ---------- 64h (hex) and 100 (decimal) are one and the same. 7Fh (hex) is 127 (decimal). 73, de Earl, K6SE