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4-6-5 OUTPUT EXPANDER IC (MAIN UNIT; IC3603)
Pin
number
4
5
6
11
13
14
Port
name
NMS
EMS
MMS
NMR
AFMS
CSEN
Description
Outputs NBDP MOD control signal for
the gate mod IC (IC2001, pin 10).
Outputs external MOD control signal
for the gate mode IC (IC2001, pin 11).
Outputs microphone MOD control sig-
nal for the gate mode IC (IC2001, pin
9).
Outputs NMEA/RS-232C switching
signal.
Outputs AF mute control signal.
Outputs SEND control signal for the
buffer amplifier (IC1303, pin 6).
4-6-4 OUTPUT EXPANDER IC FOR BANDPASS FIL-
TERS (MAIN UNIT; IC3604)
Pin
number
4
5
6
7
11
12
13
14
Port
name
B0S
B1S
B2S
B3S
B7S
B6S
B5S
B4S
Description
Outputs 0.5–1.999999 MHz bandpass
filter control signal.
Outputs 2–2.999999 MHz bandpass
filter control signal.
Outputs 3–4.999999 MHz bandpass
filter control singnal.
Outputs 5–6.999999 MHz bandpass
filter control signal.
Outputs 18–23.999999 MHz band-
pass filter control signal.
Outputs 14–17.999999 MHz band-
pass filter control signal.
Outputs 10–13.999999 MHz band-
pass filter control signal.
Outputs 7–9.999999 MHz bandpass
filter control signal.
4-6-6 D/A CONVERTER IC (MAIN UNIT; IC3606)
Pin
number
5
11
13
Port
name
POCV
FANS
TRXS
Description
Outputs transmit power control signal.
The signal is applied to the ALC ampli-
fier (IC1201, pin 3) and RF amplifier
(Q701).
Outputs the cooling fan control signal.
The signal is applied to the fan con-
troller (PA unit; IC6501, Q6501).
Outputs the transmitter/receiver
switching signal. The signal is applied
to the switching relay circuit (PLL unit;
RL7301).