Technical description
4-14 HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual
The output pin of IC209 pin 10 is connected to a NOR gate IC206/A pin 2. When
pin 2 is low, the 456.5 kHz carrier (453.5 kHz for LSB), which is always present
at IC206/A pin 3, then appears at the output (pin 1). This applies the carrier signal
via the driver transistor V203 to the input transformer T201 of the first transmitter
mixer IC8.
The output pin of IC209 pin 10 (see Sheet 2) is also connected to the input of the
NOR gate IC206/D pin 11. When pin 11 is low, the output (pin 13) is set high,
biasing V202 into saturation. The output of the second cascade NAND gate IC6/B
pin 4 goes low, opening the FET gate V204. This stops the re-inserted carrier from
being loaded by the sideband filter Z202.
The carrier appearing at the output of the second mixer IC5 will be at the
frequency of the selected channel (SCF) and is used for tuning automatic and
manual antennas.
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