Circuit Description - HYT TC-600 Service Manual

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: 400 MHz—420MHz
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 signals before they
goes to the first mixer.
136 MHz—150MHz
MCF
45.050MHz
Figure 1 Frequency Configuration
TC-600 Service Manual
450 MHz—470MHz
150 MHz—174MHz
44.595MHz