Kirisun DM588 - DM588 Other Circuit Features; DM588 Master Chip LT1901 Port Description

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