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General| Frequency Range | VHF: 136-174 MHz |
|---|---|
| Signaling | MDC 1200, DTMF |
| Modes | Digital and Analog |
| Modulation | Digital |
| Operating Temperature | -30° C to +60° C |
| Digital Features | Encryption |
Information on safety and RF exposure compliance requirements.
Details on what the warranty covers, for how long, and remedies.
Discussion of control head components: displays, controls, LEDs, ports, and power.
Description of the power amplifier stages, power control, circuit protection, and DC interconnect.
Description of the receiver front-end components: preselector, mixer, and injection filter.
Description of RF board components, synthesizer, and digital back-end module.
Explanation of VCO components and operation for VHF, UHF, and 800 MHz radios.
Description of command board functions, integrated circuits, and power control.
Description of the VOCON board, its MCU, DSP, and interface circuits.
Troubleshooting procedures for ASTRO Digital Spectra radios, covering handling and errors.
Troubleshooting procedures for ASTRO Digital Spectra Plus radios, including self-check errors.
Band-specific troubleshooting procedures for the VCO, including out-of-lock conditions.
Band-specific troubleshooting procedures for the receiver front-end.
Band-specific troubleshooting procedures for the power amplifier, including PA functional tests.
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