DR6000-2/DR7000-2
Service Manual
26
decrease, finally the output power of transmitter will decrease or vice versa. Thus, the output power of
transmitter will keep stable under any different working condition.
MCU can set the power by changing the voltage input to IC100B.
Audio Signal Processing of Transmitter
Figure 6 Schematic Diagram for Audit Circuit of Receiver
The audio signal processing circuit of Transmitter consists of IC601 and IC609. Voice signals from
MIC are sent to VCO for modulation together with CTCSS/DCS after amplification, limitation and filtering.
IC609 is a bais band processor.
AGC circuit consists of D601, D602 and Q602,Q603. The signal amplitude is reduced to ensure no
distortion in case of oversized MIC signal.
Q601, the power switch of voice processing circuit, controlled by MCU, will give power supply to IC601
only during transmission.
J501 is the socket for external MIC, and the internal MIC will disconnect automatically when using
external MIC, but the internal PTT is still effective.
5.4 PLL Frequency Synthesizer
Figure 7 Schematic Diagram for Frequency Synthesizer
The DR-6000(7000) adopts PLL frequency synthesizer.
Summary of Contents for CS700
Page 1: ...DR6000 2 DR7000 2 Service Manual 1 DR6000 2 DR7000 2 Service Manual ...
Page 17: ...DR6000 2 DR7000 2 Service Manual 17 Exploded View of the Parts ...
Page 20: ...DR6000 2 DR7000 2 Service Manual 20 DR7000 2 ...
Page 36: ...DR6000 2 DR7000 2 Service Manual 36 Chapter 6 PCB Layout ...
Page 37: ...MIC1 C5 D4 D5 D8 C4 C3 R1 D2 D3 D6 C7 C8 C9 J1 D1 D9 C2 D7 C6 C13 C1 ...
Page 70: ...DR6000 2 DR7000 2 Service Manual 66 Chapter 10 Block and Schematic ...