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General| Frequency Range | VHF: 136-174 MHz, UHF: 403-470 MHz |
|---|---|
| Operating Temperature | -30°C to +60°C |
| IP Rating | IP54 |
| Display | Alphanumeric |
| Signalling | DTMF, MDC1200 |
| Channel Capacity | 128 channels |
Provides detailed service information for the GM328/GM338/GM398 mobile radios.
Information on safe usage and RF energy awareness for mobile radios installed in vehicles or fixed site control stations.
Operational instructions for FCC occupational use requirements regarding RF energy exposure.
Details FCC requirements for compliance with RF energy exposure limits for mobile two-way radios.
Lists service aids recommended for working on the radio, including portable test sets and adapters.
Lists test equipment required to service the radio and other two-way radios.
Details the operation of the UHF receiver, covering front-end, mixer, and IF stages.
Details the three-stage LDMOS transmitter power amplifier and its components.
Details the three-stage LDMOS transmitter power amplifier and its components.
Details the three-stage LDMOS transmitter power amplifier and its components.
Describes the first stage amplifier and its DC voltage control for output power.
Explains the operation of the LDMOS driver stage and its bias control.
Details the final LDMOS and bipolar stages, bias voltage tuning, and drain current.
Details the PCIC's role in controlling the transmitter power output based on sampled RF power.
Explains the frequency synthesizer subsystem, including reference oscillator and VCO.
Describes the VCO components including VCO/Buffer IC, tank circuits, and buffer stages.
Explains the operation of the synthesizer subsystem, including pre-scaler and phase detector.
Details the microprocessor, clock generation, RAM, ROM, and A/D converter ports.
Troubleshooting flow chart for GM328 control head issues, starting with the ON/OFF function.
Provides a troubleshooting guide for receiver issues like bad SINAD or no recovered audio.
Troubleshooting steps for transmitter issues such as no or too low power when keyed.
Troubleshooting steps for transmitter issues such as no or too low power when keyed.
Troubleshooting flow chart for GM338 control head issues, starting with the ON/OFF function.
Troubleshooting steps for synthesizer issues related to voltage, signals, and lock status.
Troubleshooting steps for issues related to the Voltage Controlled Oscillator (VCO).
Troubleshooting steps for backlight issues on the GM338 control head.
Troubleshooting flow chart for GM398 control head issues, starting with the ON/OFF function.
Troubleshooting steps for microprocessor-related issues in the GM398 control head.
Continued troubleshooting steps for microprocessor issues in the GM398 control head.
Troubleshooting steps for display issues on the GM398 control head.
Troubleshooting steps for keypad backlight issues on the GM398 control head.
Troubleshooting steps for display backlight issues on the GM398 control head.
Lists general specifications for the GM338 radio.
Provides technical specifications for the transmitter section for UHF (450-520 MHz).
Provides technical specifications for the receiver section for UHF (450-520 MHz).
Details the operation of the VHF receiver, covering front-end, mixer, and IF stages.
Details the three-stage LDMOS transmitter power amplifier and its components.
Details the three-stage LDMOS transmitter power amplifier and its components.
Troubleshooting flow chart for controller issues.
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