Receiver System
Details the receiver system, including front-end RF amplifier and first mixer circuits.
IF Amplifier Circuit
Describes the first IF signal amplification, heterodyning, and filtering stages.
AF Signal System
Details the audio frequency signal path from detection to the audio amplifier.
Squelch Circuit
Describes how the squelch circuit detects noise to control audio output.
Unlock Circuit
Describes the circuit that prevents transmission when the PLL is unlocked.
Transmitter System
Provides an overview of the transmitter circuit's function and operation.
Control Circuit
Details the CPU's control functions for various transceiver systems.
Memory Circuit
Explains the EEPROM's function for storing adjustment data.
Signaling Circuit
Explains the encode process for low-speed and high-speed data signals.
MSK
Details the MSK signal path and its demodulation by the CPU.
Decode
Explains the decode process for low-speed, DTMF, and 5-tone data signals.
Power Supply Circuit
Describes the power supply circuit, including power-on, voltage detection, and protection.
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