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4 - 5
Pin Port
Description
number name
2
3
10
11, 23
14
15
22
MOD
SQLATT
T1
T2, T3
SQLIN
DTC
FC
Outputs transmit devetion control sig-
nal.
Outputs attenuator control signal.
• Outputs tunable bandpass filter con-
trol signal while receiving.
• Outputs TX power control signal
while transmitting.
Output tunable bandpass filter control
signals.
Outputs squelch control signal.
Outputs DTCS’s gradient control sig-
nal.
Outputs reference frequency control
signal to X1.
4-5-2 D/A CONVERTOR IC (MAIN UNIT: IC5)
Pin Port
Description
number name
4
7
12
6
11
13
14
FANC1
FANC
FANC2
AFMUTE
SHIFT
RXC
TXC
Outputs cooling fan control signal.
The fan speed is depended as shown
below.
Outputs AF mute circuit control signal.
High : While AF mute is ON.
Outputs TX and RX VCO’s regulator
control signals.
High : While receiving.
Low : While transmitting.
Outputs R5 regulator control signal.
Low : While receiving.
Outputs TX power control signal.
High : While transmitting.
4-5-3 I/O EXPANDER IC (MAIN UNIT: IC2)
Fan speed
Hi
Middle
Low
FANC
H
H
H
FANC1
H
L
H
FANC2
H
H
L