Decoding the Motorola GM300 model number provides critical details about the radio’s specifications, such as frequency band, power output, channel capacity, and more. The GM300 model number typically follows Motorola’s standard convention, with the first six characters indicating the base model and the subsequent characters specifying features like RF power, frequency range, channel spacing, and logic board capabilities. Below is a step-by-step guide to decoding a GM300 model number, based on information from reliable sources.
Fig: DecodingMotorola gm300 model number
Motorola GM300 Logic Board Differences
Expanded Logic Board (C)
- 4-layer PCB construction
- Socketed EPROM for firmware
- 16-channel capability
- Programmable accessory pins
- Advanced signaling features (MDC1200, etc.)
- Channel steering capability
- Used in 16-channel radios
Masked Logic Board (D)
- 2-layer PCB construction
- Firmware stored in microprocessor
- 8-channel capability (can be modified for 16)
- Fixed accessory pin assignments
- Limited signaling features
- Used in 8-channel radios and M120/M130 models
Important Notes
- Frequency Range Specificity: The GM300 was the first Motorola product line where the model number includes the specific frequency range (position 10). This makes it easier to determine exact capabilities.
- Board Compatibility: RF boards and power amplifiers are frequency-specific and cannot be easily changed between ranges.
- Channel Modifications: The RSS (Radio Service Software) can be modified to allow 8-channel radios to accept 16 channels, and 16-channel radios to accept up to 40 channels.
- Related Models: M10 (1-channel), M120 (2-channel), and M130 (2-channel with signaling) use similar numbering but may have XV or XQ series designations.
Motorola GM300 Accessories and Compatibility
GM300 radios use the same accessories as MaxTrac radios:
- Loudspeakers
- Microphones
- Accessory plugs
- Power cords
- Mounting brackets
Motorola GM300 Programming
The GM300 uses HVN8177 RSS (Radio Service Software) for programming, which is different from MaxTrac RSS but operates similarly. The programming cable and RIB (Radio Interface Box) setup is the same as MaxTrac radios.
This decoding system helps identify the exact specifications and capabilities of your GM300 radio, ensuring proper programming and accessory compatibility.
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