Pro Tip: The GM339’s accessory connector pinout is critical. Pin 1 (Ground), Pin 2 (BUS+ / Programming Voltage), Pin 3 (Data), Pin 4 (Data). If you hear your speaker "thump" when inserting the cable, you have power; if not, your RIB isn't powered (RIB requires 9V battery or external 12V).
“The GM339 is a 99-channel, 25W radio often used in European fleets. The software is hard to find because Motorola locked it down — but if you get the right CPS, programming is straightforward via a standard Rib-less USB cable (aftermarket) with a MAX232 chip. The trick: Windows XP 32-bit or a true DOS VM. On Windows 10, the programming times out unless you slow down the USB polling.”
Another gem from forums:
“I bought a ‘GM339 programming software CD’ on eBay — it was just a cracked R06.12.05 with a keygen. Malware alert! Instead, find the genuine Motorola RIBless cable (eBay/AliExpress) and ask for the CPS on radioreference.com or repeater-builder.com. People will share the original installer.”
There is a common misconception that the Motorola Professional Series CPS works with the GM339. It does not. The GM339 predates native Windows CPS. If you try to use the newer CPS (e.g., for the CDM or HT series), the software will not recognize the radio’s cloning protocol.
Verdict: You must use DOS-based RSS R06.xx for the GM339. No modern Windows CPS will work. motorola gm339 programming software
Because you are reading this article, you likely own a GM339 from eBay or a surplus sale. Be aware:
The software, typically running on a Windows environment, utilizes a spreadsheet-style interface. Key areas of the configuration include:
Here’s a draft for a blog post or forum-style guide on Motorola GM339 programming software. You can adjust the tone depending on your audience (ham radio operators, commercial radio techs, or hobbyists).
Title: Programming the Motorola GM339: Software, Cables, and Common Pitfalls
Intro
The Motorola GM339 is a rugged, no-frills analog mobile radio, popular in public safety, commercial fleets, and increasingly with amateur radio operators. But programming one isn’t as simple as plugging in a USB cable. If you’re looking for the right software and a smooth read/write process, here’s what you need to know. Pro Tip: The GM339’s accessory connector pinout is
Official Software (Motorola)
The GM339 is programmed using Motorola’s Radio Service Software (RSS) — specifically, the GM339 RSS version R03.00.00 or later.
⚠️ Important note: Do NOT confuse GM339 RSS with CPS (Customer Programming Software). CPS is for newer radios like the Mototrbo series. The GM339 uses old-school RSS.
Cable Requirements
Step-by-Step (Using DOS RSS)
Common Errors & Fixes
| Error | Likely Cause | Fix | |-------|--------------|-----| | “Communication with radio failed” | Wrong COM port, cable issue, or radio not powered | Verify cable, try slower baud rate (9600), or use a true RIB | | “Codeplug too new/old” | RSS version mismatch | Find exact RSS version that matches your radio’s firmware | | “Out of range” | Frequency outside radio’s band split (e.g., 146 MHz in a 150–174 MHz model) | Check your GM339’s model number for band limits | | “No response from radio” | Radio not in programming mode or bad connection | Try different USB port, restart DOSBox, or power cycle radio |
Where to get the software
Because Motorola RSS is copyrighted but abandonware, we can’t link directly here. Search for:
Alternatives?
There are no aftermarket programs like CHIRP for the GM339. You must use Motorola RSS. Some people use DOSBox on a Raspberry Pi to program in the field.
Final Tip
If you’re just getting into programming older Motorolas, keep a dedicated old laptop with a real serial port and Windows 98 or DOS 6.22. It will save you hours of driver headaches.
For users interested in programming and customizing their Motorola GM339 radio, there are a few software tools and resources that can be quite helpful. The Motorola GM339 is a popular choice among amateur radio enthusiasts and professionals alike due to its versatility and range of features. “The GM339 is a 99-channel, 25W radio often
The GM339 was manufactured primarily in the mid-to-late 1990s. Therefore, the native software for this radio is RSS (Radio Service Software) that runs in MS-DOS (or a true DOS environment like FreeDOS).