I tied a knot round the connector on the board to stop it being pulled off the board. If you use thin wire you will be able to feed this out the edge of the 16 way connector. Remove the front of radio and the bottom cover and lift off the RF shield. You will need to access the logic board on the underside of the radio. You can make up a circuit to convert the output from pin 8 or take a COS/COR output from inside the radio that will give you a (active high) output. Many interfaces need a COS/COR input that is (active high) at 2 to 5vdc. If you want to use the COS/COR output from your GM300 the COS/COR on pin 8 is (active low). GM300 programming connection Motorola RJ45 GM300 interface When looking at the radio here are the numbersGM300 mic socketĪs you can see to make the programming interface for your GM300 is very basic.Ĭonnection your Motorola GM300 for Echolink or IRLP etc. You can make your own or just search on Ebay for “GM300 programming” or make programming interface from below “at your own risk” You will also need a simple interface to connect the radio to your PC. If you want a copy of Motorola Doctor software just join the following group
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