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Maxon DM-2550NM data radio

The first thing that I did was to make a voltage regulator that will give me about 11V. This is needed because this radio needs a 10.8V plus or minus 10% power supply. It's easy to make a Voltage regulator using something like the LM317. There is a site that has all the details here: Papakura radio club.

I also managed to find the service manual of the radio. You can get it here.