This Y-Cable plugs into the front RJ45 mic connector of the Yaesu FT-991A and provides a 1/4 inch female TS Mono and a female 3 pin XLR.
The 1/4 inch TS Mono is wired to the PTT pins.
The 3 pin XLR is wired to the microphone pins.
This cable will allow you to connect your radio to a mixing board or a dynamic microphone. This is for microphone input only. You will also need a PTT switch. Best practice is to also utilize a DI box.
DI Box: Amazon
PTT Hand Switch: Amazon
PTT Foot Switch: Amazon