Brief description
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual 3-3
Control and switching
Most of the transceiver functions are microprocessor controlled. The channel
frequencies are programmed via the microprocessor to the Electrically Erasable
Programmable Read Only Memory (EEPROM). The remaining facilities are pre-
programmed in the Erasable Programmable Read Only Memory (EPROM).
The power On function is controlled by hardware and the power Off function is
controlled by software. The rotary volume control is a digital contacting encoder.
It controls a 16-step attenuator in the audio signal path between the preamplifier
(after the demodulator) and the amplifier. This drives the loudspeaker.
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