Table of Contents
Advertisement
VCO are mixed inside IC101, pass through CF1, and 1st IF frequency of 10.695 MHz is
generated.Further, 10.695 MHz and 10.240 MHz that oscillated at X101, passes through MIXER
inside IC101 and is filtered at CF2 and outputs 2nd IF 455 kHz.
18.2. Receiver Signal Circuit
18.2.1.
Circuit Operation:
After getting the 455kHz signal, it is input to Pin 33 of IC101 and passes through IF AMP and
Detector Circuit, then are output to Pin 26 . AF signal flows through R123, C124. Its level is
controlled by the VOLUME CONTROL Amp of IC101.The signal is received at Pin 25 of IC101,
then it passes through the following circuits: PREAMP, Expander and Amplifier: It goes out at
Pin 16 and finally is sent to the SP.Inside IC101, RX-MUTE, MIC-MUTE and PLL circuits are
controlled by the serial data that the CPU send from Pins 28 , 29and 30 .
47
Advertisement
Table of Contents
