This ModMic adapter contains a circuit to power the ModMic from the transceiver, it should not be used with dynamic microphones. It also features a RCA female jack for PTT or foot switch.
ModMic to Yeasu FT-450, FT-8×7, FT-900 adapter
ModMic adapter to connect the ModMic boom microphone to the Yeasu FT-450, FT-817, FT-857, FT-897, and FT-900 transceivers.
unlimited available through backorder