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3-7-5 OUTPUT EXPANDER IC (IC3603)
Pin
number
4
5
6
11
13
14
Port
name
NMS
EMS
MMS
NMRS
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
singnal.
Outputs AF mute control signal.
Outputs SEND control signal for the
buffer amplifier (IC1303, pin 6).
3-7-6 OUTPUT EXPANDER IC (IC3605)
Pin
number
4
5
6
7
14
Port
name
B8S
DBP1
DBP2
DBP3
DBP4
Description
Outputs 24–30 MHz bandpass filter
control signal.
Outputs bandpass filter control signal
for DSC circuit (For 2.1875, 4.2075,
6.3120 MHz).
Outputs bandpass filter control signal
for the DSC circuit (8.4145 MHz).
Outputs bandpass filter control signal
for the DSC circuit (12.5770 MHz).
Outputs bandpass filter control signal
for the DSC circuit (16.8045 MHz).
3-7-4 OUTPUT EXPANDER IC FOR BANDPASS FIL-
TERS (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.
3-7-7 D/A CONVERTER IC (IC3606)
Pin
number
5
6
11
13
Port
name
POCV
AFG
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 VCA control signal. The
signal is applied to the VCA amplifier
(IC1603, pin 8) and RC-25 controller
via the J2051, pin 5.
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 (FILTER
unit; RL7301).