Hirose HRS10A connector $20.00 from AT

The transmitter has a receptacle with pins. The mic uses a plug with sockets.

pin 1 and pin2 shield

pin 3 white - audio

pin4 red - bias

Digikey connector # Hirose #

Plug HR113-ND HR10A-7P-4S cable mount socket $14.55
Receptacle HR210-ND HR10A-7R-4P chassis mount pins $8.07
Jack HR310-ND HR10A-7J-4P Cable mount for extensions. $12.03

Crown has a tech note with most belt-pack pinouts