I’ll confess that I am new to this part. It was dumped on me without warning and that’s OK. Time to learn a few things. I have a GM300 that is going to be a remote base and a cable purchased from eBay that is prewired for the GM300 side. I understand (I think) that TX goes RX, RX goes to TX, GRND to GRND – but now for PTT, COR and CTCSS. I wonder if some could push me over a cliff – I mean in the right direction. I have no documentation on the RTCM.
Thanks, R. Wayne
The RTCM connections are:
DB9-Female
1 Vin (12v)
2 TX Audio
3 RX Audio
4 CTCSS
5 GND
6 GND
7 PTT
8 GND
9 GND
The GM300 cable (and radio) connections are:
Pin #
2 MIC BLU
3 PTT WHI-BLU
4 PROGRAMMABLE OUTPUT BRO
5 FLAT TX AUDIO GRN
7 GROUND WHI-GRN
8 PROGRAMMABLE I/O (COR ?)ONG
11 RECEIVE AUDIO WHI-ONG
14 PROGRAMMABLE I/O WHI-BRO
15-16 Jumpered to enable internal speaker