Accessory Connector Information - Icom IC-7700 Instruction Manual

■ Accessory connector information

ACC 1 PIN No. NAME
1
2
3
2
4
5
3
1
8
6
7
4
5
6
7
8
NOTE: If the CW side tone level limit or beep level limit is in use, the CW side tone or beep tone decreases
from the fixed level when the [AF] control is rotated above a specified level. (p. 12-6)
ACC 2 PIN No. NAME
1
2
2
3
4 5
1 3
4
6
7
5
6
7
*
When the SEND terminal controls the inductive load (such as a relay), a counter-electromotive force can cause
the transceiver's malfunction or damage. To prevent this, we recommend adding a switching diode, such as an
"1SS133," on the load side of the circuit to the counter-electromotive force absorption.
When the diode is added, a switching delay of the relay may occur. Be sure to check its switching action before
operation.
DESCRIPTION
RTTY
Controls RTTY keying
Connects to ground.
GND
Connected in parallel with ACC 2 pin 2.
An external equipment
controls the transceiver.
Input/output
When this pin goes low,
pin.
the transceiver transmits.
SEND* Connected in
parallel with
The transceiver outputs
ACC 2 pin 3.
a low signal to control ex-
ternal equipment.
Modulator input.
MOD
Connects to a modulator.
AF detector output.
AF Fixed level, regardless of [AF] position
in default settings. (see notes below)
Squelch output.
SQLS
Grounded when squelch opens.
13.8 V output when power is ON.
13.8 V
Connected in parallel with ACC 2 pin 7.
ALC voltage input.
ALC
Connected in parallel with ACC 2 pin 5.
DESCRIPTION
8 V
Regulated 8 V output.
GND Same as ACC 1 pin 2.
SEND* Same as ACC 1 pin 3.
Band voltage output.
BAND
(Varies with amateur band)
ALC Same as ACC 1 pin 8.
Activates [X-VERTER] input/output
TRV
when "HIGH" voltage is applied
13.8 V Same as ACC 1 pin 7.
[Example]
ACC 1/2
sockets
e SEND
u 13.8 V
INSTALLATION AND CONNECTIONS
Switching diode
Relay
2-11
SPECIFICATIONS
"High level" : More than 2.4 V
"High level" : Less than 0.6 V
Output current : Less than 2 mA
———
Input voltage (High) : 2.0 V to 20.0 V
Input voltage (Low) : –0.5 V to 0.8 V
Current flow : Max. 20 mA
Output voltage (Low) : Less than 0.1 V
Current flow : Max. 200 mA
Input impedance : 10 kΩ
Output level : Approx. 100 mV rms
Output impedance : 4.7 kΩ
Output level : 100–300 mV rms
SQL open : Less than 0.3 V/5 mA
SQL closed : More than 6.0 V/100 µA
Output current : Max. 1 A
Control voltage
: –4 V to 0 V
Input impedance : More than 10 kΩ
SPECIFICATIONS
8 V ±0.3 V
Output voltage :
Output current Less than 10 mA
:
Output voltage : 0 V to 8.0 V
Input impedance : More than 10 kΩ
Input voltage : 2 V to 13.8 V
To a non-Icom
linear amplifier
2