Starting Motorola's Radio Service Software
Now it's time to see if we did so far is correct. Let's start DOSBox and see what happens. You should see a welcome screen that tells you to push any button, and then the following screen below.
If you see this screen above, congratulate yourself! You have successfully configured DOSBox to run Motorola's Radio Service Software.
Now comes the part that just about everyone has trouble with . . . getting your Motorola Radius to communicate with your computer. Cheap programming cables, and too fast of a CPU speed (on your computer/DOSBox) are the main cause of this problem. We already discussed what cables worked for me. Now let's go over how to slow down the CPU speed.
Slowing Down the CPU Speed in DOSBox
While DOSBox is running, hold down the "Ctrl" key and press "F11" until the CPU Speed (displayed in the title bar) reaches somewhere around 191 cycles. If you went too far, hold down the "Ctrl" key and press "F12" to raise the speed back up. I was able to successfully program with a CPU Speed of up to 400 cycles.
Configuring and Testing the Motorola RSS
Now it's time to configure the RSS, and test the connection between your computer and your Motorola Radius.
- From the "Main Menu" of the Motorola RSS, press "F9" to get into the "Setup Computer Configuration Menu".
- Now press "F3" to go into the "PC Configuration Menu"
- You will need type in the "Default Path Names" on this screen.
DEFAULT PATH NAMES
RIB . . . . . . . . . . . . . . . COM1
- Now press "F8" to save your settings.
- Press "F3" to preform a "COMM TEST". This is where you will find out if your computer and your radio will be able to communicate. Look to make sure you get the "Radio Communications OK" message. If you get any error messages, double check everything above, and make sure all the settings are correct.
Programming Frequencies, Tones, Offset, and the Time Out Timer
- If you are not at the Main Menu, press "F10" until you get there. Press "F3" to "GET/SAVE Codeplug Data".
- Now press "F2" for the "READ Radio" option.
You should see a screen that looks like the one pictured below.
- After that is complete, press "F10" and then "F4" to get to the "CHANGE/VIEW Codeplug" menu. Now press "F5" to get into the "MODE Configuration: Frequency, Squelch Type, and Codes" menu.
This is where you can change the frequencies, PL tones, offset, and time out timer.
- Change the settings to what you require, and then press "F10" twice to return to the "Main Menu".
- Now press "F3" and then "F8" to select the "PROGRAM Radio" option. A warning screen will appear. Press "F2" to continue programming your Motorola Radius.
This is the screen (below) that you will see when your Motorola Radius is programming.
- Celebrate! You have programed your Motorola Radius!
- Mitch Martin (KF5RRX) also wrote a great article about how to program a Motorola Radius GM300 with Windows using DOSBox.
- A good source of information about Motorola Maxtrac / Radius / GM300 radios is at the repeater-builder.com website.
- Find used Motorola Maxtrac / Radius radios on eBay.