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4-6-4 OUTPUT EXPANDER IC FOR BANDPASS
FILTERS (MAIN UNIT; IC3604)
Pin
Port
number
name
Outputs 0.5–1.999999 MHz bandpass
4
B0S
filter control signal.
Outputs 2–2.999999 MHz bandpass
5
B1S
filter control signal.
Outputs 3–4.999999 MHz bandpass
6
B2S
filter control singnal.
Outputs 5–6.999999 MHz bandpass
7
B3S
filter control signal.
O u t p u t s 1 8 – 2 3 . 9 9 9 9 9 9 M H z
11
B7S
bandpass filter control signal.
O u t p u t s 1 4 – 1 7 . 9 9 9 9 9 9 M H z
12
B6S
bandpass filter control signal.
O u t p u t s 1 0 – 1 3 . 9 9 9 9 9 9 M H z
13
B5S
bandpass filter control signal.
Outputs 7–9.999999 MHz bandpass
14
B4S
filter control signal.
4-6-5 OUTPUT EXPANDER IC (MAIN UNIT; IC3603)
Pin
Port
number
name
Outputs NBDP MOD control signal for
NMS
4
the gate mod IC (IC2001, pin 10).
Outputs external MOD control signal
for the gate mode IC (IC2001, pin
EMS
5
11).
Outputs microphone MOD control
signal for the gate mode IC (IC2001,
MMS
6
pin 9).
Outputs NMEA/RS-232C switching
11
NMR
signal.
Outputs AF mute control signal.
AFMS
13
Outputs SEND control signal for the
CSEN
14
buffer amplifier (IC1303, pin 6).
Description
Description
4-6-6 D/A CONVERTER IC (MAIN UNIT; IC3606)
Pin
Port
number
name
5
POCV
11
FANS
13
TRXS
4 - 8
Description
Outputs transmit power control
signal. The signal is applied to the
ALC amplifier (IC1201, pin 3) and
RF amplifier (Q701).
Outputs the cooling fan control signal.
The signal is applied to the fan
controller (PA unit; IC6501, Q6501).
Outputs the transmitter/receiver
switching signal. The signal is applied
to the switching relay circuit (PLL unit;
RL7301).
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