DM588 Service Manual
4. Circuit Description
4.1.Schematic Circuit Diagram of Main Board
4.2.Tx Circuit
The TX circuit includes an RF power amplification circuit, a low pass filter circuit and an automatic
power control circuit.
RF Power Amplification Circuit
Transmitting signals TX VCO are buffered and amplified by the Q7, Q8, Q9 and then the pre-drive
amplifier Q18 to generate strong enough driving power signals, and then amplified by the last-stage
amplifier Q29. Then, impedance matching is finished at the output end of the last-stage amplifier
4
Содержание DM588
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