Hello.. GM300 Pin 11 - RTCM Pin 3 - Rx Audio JU 551 inside the GM300, in position A gives FLAT (not De-emphasised) audio out pin 11.We want to use the RTCM's internal Squelch. GM300 Pin 8 - RTCM Pin 4 - CTCSS Input GM300 Pin 5 - RTCM Pin 2 - TX Audio GM300 Pin 3 - RTCM Pin 7 - PTT GM300 Pin 7 - RTCM Pin 9 - Gnd RTCM Info - http://www.micro-node.com/thin-m1.html GM300 Info- http://www.batlabs.com/gm300.html Google is your friend. Have fun!!! On Sat, Jun 20, 2015 at 1:48 AM, R. Wayne <allstar@controlservers.net> wrote:
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
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