Technical description
HF SSB Transceiver 9323/9360/9390/9780 Technical Service Manual 4-25
In band selection, the binary numbers are decoded as follows:
Table 4 -15: Frequency band and number
Band Number Frequency Band
1 Less than 2.0 MHz
2 2.0 MHz to 2.99 MHz
3 3.0 MHz to 4.99 MHz
4 5.0 MHz to 7.99 MHz
5 8.0 MHz to 12.99 MHz
6 13.0 MHz to 19.99 MHz
7 20 MHz and above
The TUNE IN/TUNE OUT line (pin 4) and TUNED IN line (pin 11) are two
control lines required by some automatic antenna systems. The TUNE IN/TUNE
OUT line, once activated, is held low by the automatic antenna control network. It
maintains the Tune mode while the automatic antenna completes the tune process.
The microprocessor IC101 checks the TUNED IN line for a high or low on
completion of the tuning sequence. A high indicates to the microprocessor that the
tune has been successful. A low indicates that the tune has failed. This
information is displayed on the LCD. Audio beeps are also provided to the
speaker.
The SCAN line (pin 5) goes low when in Scan mode and selects the scan
amplifier in the automatic antenna.
When the PTT is initiated, pin 8 provides an active high and can be used by some
tuners in their logic circuits.
To enable the tuners to be powered from the transceiver, a fused switched supply
from the transceiver’s battery power is provided by pins 12 and 13 (positive) and
pins 14 and 15 (ground).
E
2
PROM write protect
Output of the microprocessor IC101 pin 21 [1 04-02976 Sheet 1] is connected
via inverter IC113/E and R156 to the base of switching transistor V106. Except
during programming, IC101 pin 21 is high resulting in V106 conducting, which in
turn sets IC105 pin 27 high (write protect).
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