TC-600 Service Manual
11
Circuit Description
1. Frequency Configuration
The receiver utilizes double conversion superheterodyne. The first IF is 45.050MHz and the
second is 455 KHz. The first local oscillator signal is supplied from PLL circuit. Frequency needed
in the transmitter is supplied from PLL circuit. Figure 1 shows the frequency configuration.
Frequency Range: 150 MHz— 174MHz
400 MHz— 420MHz
450 MHz— 470MHz
Figure 1 Frequency Configuration
2. Receiver
The receiver utilizes double conversion superheterodyne.
1) Front-End RF Amplifier
The input signal from antenna is amplified in RF amplifier (Q27) after passing through the
receive/transmit switch circuit and a 3-stage LC band pass filter. The amplified signals are
filtered by a band pass filter (a 3-stage LC BPF) to eliminate unwanted signal s before they go
to the first mixer.
MCF
45.050
MHz
44.595MHz
