If you have a serial port on your computer, Windows 8.1 is fast, and efficient, but Windows 7 drivers are more mature and available at this point. I ended up ordering an old fashioned serial card to install in the computer.
I am using windows 8,1, but having trouble finding a USB to Serial adapter to hook my scanner up to the computer, that has drivers that will work with 8.1. Take care not to short this COS/COR out because it will damage the radio. 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). Connection 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' GM300 programming connection When looking at the radio here are the numbers As you can see to make the programming interface for your GM300 is very basic.
See a video of the software in use If you want a copy of Motorola Doctor software just join the following group You will also need a simple interface to connect the radio to your PC.
This program runs fine under Windows XP and will do all the functions that the genuine Motorola radio service software does.
After searching for the genuine Motorola program I came across Motorola Radius GM300 Radio Doctor. Programming / Service software for the Motorola Radius GM300 It has been pointed out to me that this software only works with the GM300 so I have adjusted the page. Motorola Radius Gm300 Radio Doctor Download Average ratng: 5,7/10 8718reviews
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