Circuit Description - HYT TC-500 Service Manual

Hide thumbs Also See for TC-500:

Table of Contents

Service Manual

4. Circuit Description

4.1

General Principle Diagram

The general circuit is composed of RDA chip circuit, TX circuit, RX circuit, power supply circuit, control

circuit, etc. See the block diagram below:

RDA Chip Circuit

This chip is highly integrated. Its function includes voice signal processing/modulation/demodulation,

DSP, VCO, PLL, LNA and RF IF. The voice signal from MIC goes to RDA chip for amplification. Next,

the amplified voice signal will undergo a series of processing including A/D conversion, filtering,

pre-emphasizing, gain control, amplitude limit and D/A conversion. Then the analog voice signal is

delivered to VCO and amplified to a signal with 8dBm. When the RX RF signal enters this chip, it

would experience demodulation, filtering, de-emphasizing and gain control. Finally, the signal is

output to the audio amplifier.

TX Circuit

Figure 1

Circuit Description

Table of Contents