RCA Amp Amplifier Relay Keying Cable 8 Pin Mini Din For Yaesu HF Radio FT-991A
The amplifier keying circuit is present on both linear and tuner jacks for certain radios. Type: Amplifier keying cable. FTDX-10, FTDX-1200, FT-450, FT-450D, FT-847 (HF), FT-950 -- TUNER jack. FT-840, FT-900 -- BAND DATA jack.