Icom IC-7851 - ACC socket

20-2
20
CONNECTOR INFORMATION

ACC socket
1
2
3
4
5
6
7
8
ACC 1 PIN No. NAME DESCRIPTION SPECIFICATIONS
1
RTTY
Controls RTTY keying
“High level”:
“Low level”:
Output current:
More than 2.4 V
Less than 0.6 V
Less than 2 mA
2 GND
Connects to ground.
Connected in parallel with ACC 2 pin 2.
3 SEND*
Input/output
pin.
Connected in
parallel with
ACC 2 pin 3.
An external equipment
controls the transceiver.
When this pin goes low,
the transceiver transmits.
Input voltage (TX):
Input voltage (RX):
Current flow:
–0.5 V to 0.8 V
2.0 V to 20.0 V
Maximum 20 mA
The pin outputs a low lev-
el signal when the trans-
ceiver transmits.
Output voltage (TX):
Current flow:
Less than 0.1 V
Maximum 200 mA
4 MOD
Modulator input.
Connects to the internal modulator
circuit.
Input impedance:
Output level:
10 k
Ω
Approximately 100 mV rms
5
AF/ IF
(IF=12 kHz)
Fixed AF detector or receive IF (12 kHz)
signal output.
Output impedance:
Output level:
4.7 k
Ω
100–300 mV rms
6 SQLS
Squelch output.
Grounded when the squelch opens.
SQL open:
SQL closed:
Less than 0.3 V/5 mA
More than 6.0 V/100 µA
7 15V
15V output when power is ON.
Connected in parallel with ACC 2 pin 7.
Output current: Max. 1 A
8 ALC
ALC voltage input.
Connected in parallel with ACC 2 pin 5.
Input impedance:
Input level:
More than 10 k
Ω
–4 V to 0 V
1
2
3
4
5
6
7
ACC 2 PIN No. NAME DESCRIPTION SPECIFICATIONS
1
8 V
Regulated 8 V output.
Output voltage:
Output current:
8 V ±0.3 V
Less than 10 mA
2 GND Same as ACC 1 pin 2.
3 SEND* Same as ACC 1 pin 3.
4 BAND
Band voltage output.
(Varies with the selected amateur band)
Output voltage: 0 V to 8.0 V
5 ALC Same as ACC 1 pin 8.
6 TRV
Activates [X-VERTER] input/output
when “HIGH” voltage is applied
Input impedance:
Input voltage:
More than 10 k
Ω
2 V to 13.8 V
7 15V Same as ACC 1 pin 7.
B
(Rear panel view)
Connects to external equipment or a personal com-
puter to control the external unit or to control the trans-
ceiver.
Sockets [A ACC1] and [A ACC2] output AF signals of
the Main band, sockets [B ACC1] and [B ACC2] output
AF signals of the Sub band.
(Rear panel view)
(Rear panel view)