LDG's new YT-100 is just that. An included CAT cable interfaces with your FT857, FT897 and FT-100 (including all D models). This makes it an integrated tuner powered by the interface. No extra power cables are needed. Just press the tune button on the tuner and everything else happens automatically! The mode is set to carrier and the RF power is reduced, a tune cycle runs and the radio is returned to the original settings.
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