: The official Motorola support website is a great place to start looking for the GM339 programming software and user manuals.
Unlike modern radios that use a simple USB-to-Serial chip, the GM339 originally required a Radio Interface Box (RIB) motorola gm339 programming software
Adjust the (12.5 kHz for narrow-banding compliance or 25 kHz where permitted). 4. Setting Up the Zones : The official Motorola support website is a