I'm not going into detail with programming the radio, but I will however, point out areas to pay attention to. You have to be able to find a computer with a serial DB9 port which will run the GM300 RSS on DOS, as well as you need to have the programming cable. Program the radio This part is somewhat difficult as well.

Secure the cable and its slack with a zip tie to prevent it from getting pulled apart.

Insert the pins into the proper slots in the 16-pin accessory connector.

Crimp them gently to prevent damaging the pins.

Use a little solder on the pin connector and adhere the wires to them.

I used zip ties to secure the cable to make sure it doesn't slide in and out of the cover.

Solder the wires on the proper leads for the DB9 connector.

Strip about an inch and a half of the cable sleeve and also strip 3-4mm of the insulator off the wires.

Plan out the wiring scheme and wiring colors below is a diagram how I put the cable together.

Make that interface cable!The hardest part about this project is making the cable! Having to solder and crimp those small pins for the 16-pin accessory connector is a pity.

HamVoip Distribution Allstarlink Image v.1.6-14.

Interface cables (I use solid CAT6/E or CAT5/E).

Motorola HLN9457A 16-PIN Accessory Connector Kit.

Raspberry Pi 3B or 3B+ (Out of stock everywhere! Perhaps one laying around?).

Masters Communications RA-25 usb radio adapter interface ($30 unassembled, $60 assembled & tested, $15 for a 3d printed case).

Motorola GM300 from eBay, other market places or Ham friends :D.

Here are the parts to source and the software. Recreate a simplex Motorola GM300 Allstarlink node.

Here's the documentation so that you do not fall into the same pitfall I did - T&E (trial and error) at its finest.

Unfortunately, it did not work so I went ahead and recreated it last night and found the problem I have created for myself. Simplex Motorola GM300 Allstarlink NodeOne of our fellow hams who belong to a group up in Canada asked for help on making a cable for their simplex node to interface with their local repeater via RF - I made a cable, but never tested it out for myself and just went by documentation.

Cos motorola gm300