Brief description
3-4 HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual
Synthesiser
The 9323, 9360, 9390 or 9780 transceivers use single loop synthesisers. The main
synthesiser (VCO1) generates an oscillator frequency in 2 kHz steps. In receive,
the oscillator frequency ranges from 45.250 MHz to 75 MHz. In transmit the
oscillator frequency will depend on the transceiver type and the options fitted. It
will be within the range of 46.6 MHz to 75 MHz.
The vernier synthesiser (VCO2) generates oscillator frequencies of 44.5435 MHz
to 44.5455 MHz in 10 Hz steps.
The synthesisers are controlled by the same process that controls the remainder of
the transceiver. Serial data representing the various pre-programmed channel
frequencies is loaded into both synthesisers.
When upper sideband is selected, the 9323, 9360, 9390 or 9780 uses a single
crystal reference oscillator of 7304 kHz. The reference oscillator is also used to
provide the 456.5 kHz (7304 kHz divided by 16) signal for the audio
modulator/demodulator.
For lower sideband operation a separate crystal oscillator is selected, operating at
1814 kHz to provide 453.5 kHz (1814 kHz divided by 4) to the audio
modulator/demodulator.
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