The IC-PAC and IC-PAC-6 interface cables providing DC power and control between the radio and the autotuner. Available in six foot (IC-PAC-6) and one foot (IC-PAC). Supported Radios: IC-7000, IC-7600, IC-7700, IC-7100, IC-7200, IC-7300, IC-706, IC-707, IC-718, IC-725, IC-728, IC-736, IC-738, IC-746, IC-756. This interface cable will work with any Icom radio that supports the Icom AH-3 or AH-4 Tuner. Please check your radio's manual. Functionality: Pressing the tune button quickly on the tuner by-passes the tuner. Pressing and holding the tune button on the radio or tuner starts the tune process. Note: If you are using this cable with the IC-718, be sure to set the tuner menu to “4”. The LDG tuner and interface cable emulates the Icom-AH-4 tuner.