The Motorola Radius SM50 is an old business band radio that has been converted by many to serve as repeaters. There is plenty of documentation over on Repeater Builder about this radio including service manuals. I decided to pick one of these up to use with APRS. Specifically I planned on setting it up with a weather station.
First off, what is the 2 meter band and why is it called that? In the United States, the FCC has allocated 144 MHz to 148 MHz for amateur radio use to those holding a Technician or higher license. Radio operators may use any mode whether it's AM, FM SSB, Data etc between 144.100 and 148.00 MHz. The use of only CW has been restricted from 144.000 to 144.100 MHz. Now why is it called the 2 meter band. This band is called 2 meter because a complete wavelength of 144 MHz is approximately 2 meters long.
