The official software for the GM338 is (or later). This is not free software from Motorola—it is a licensed product historically sold to dealers. You can often find archived versions on hobbyist forums, but beware of malware.
Post-2013 FCC narrowbanding mandate: Always set bandwidth to 12.5 kHz unless operating on a grandfathered wideband license. Failure to do so causes:
The radio supports up to 128 channels, each of which can be individually programmed for power output, Private Line (PL), or Digital Private Line (DPL). www.motorolasolutions.com Operational Highlights Signaling Options: Motorola Gm338 Programming Manual
Remember the golden rules: With the manual on your screen (or printed out next to your programming laptop), you will find that programming the GM338 is straightforward, logical, and deeply satisfying.
The primary tool for editing radio features, such as frequency assignments, signaling schemes (MDC1200, DTMF), and channel spacing (12.5/20/25 kHz). Programmable Buttons: The official software for the GM338 is (or later)
: Includes comprehensive technical specifications and computer software copyrights for internal programs. Available via Repeater Builder .
The golden rule of radio programming, emphasized in every manual, is: When you open the CPS and click "Read Radio," the software pulls the current codeplug (the radio's memory file) into the computer. This is crucial because it preserves the "Tuning" data. The tuning data contains the calibration values for the radio’s power output, deviation, and sensitivity specific to that individual unit. If you were to write a blank codeplug to the radio without reading it first, you might overwrite this calibration data, rendering the radio underpowered or "deaf." Post-2013 FCC narrowbanding mandate: Always set bandwidth to
Do not download “CPS + Manual” bundles from random torrent sites. Many contain malware designed to steal credentials.
The Motorola GM338 is a cornerstone of the professional mobile radio (PMR) market. Part of the Professional Series, this 40-watt, 128-channel mobile transceiver is renowned for its ruggedness, audio clarity, and advanced signaling capabilities (MDC1200, Quik-Call II, 5-Tone). However, its full potential is locked behind a cryptic interface: the .