Icom IC-756PRO - Panel Description........... 2

!2 ANTENNA CONNECTOR 1 [ANT1]
!3 ANTENNA CONNECTOR 2 [ANT2] (pgs. 14, 15)
Accept a 50 Ω antenna with a PL-259 connector.
When using an optional AH-4 HF/50 MHz AUTO-
MATIC ANTENNA TUNER
or AH-3 HF AUTOMATIC AN-
TENNA TUNER
, connect it to the [ANT1] connector.
The internal antenna tuner activates for [ANT2] and
deactivates for [ANT1] when connecting the AH-4 or
AH-3.
DACC SOCKETS
!4 GROUND TERMINAL [GND] (pgs. 14, 15)
Connect this terminal to a ground to prevent electri-
cal shocks, TVI, BCI and other problems.
13
2
PANEL DESCRIPTION
ACC(1) PIN NO. PIN NAME DESCRIPTION SPECIFICATIONS
1
RTTY Controls RTTY keying.
“HIGH” level : More than 2.4 V
“LOW” level : Less than 0.6 V
Output current : Less than 2 mA
2 GND Connects to ground. Connected in parallel with ACC(2) pin 2.
3 SEND
Input/output pin.
Goes to ground when transmitting.
When grounded, transmits.
Ground level : –0.5 V to 0.8 V
Output current : Less than 20 mA
Input current (Tx) : Less than 200 mA
Connected in parallel with ACC(2) pin 3.
4 MOD
Modulator input.
Connects to a modulator.
Input impedance : 10 kΩ
Input level : Approx. 100 mV rms
5 AF
AF detector output.
Fixed, regardless of [AF] position in
default settings. (see notes below)
Output impedance : 4.7 kΩ
Output level : 100 to 300 mV rms
6 SQLS
Squelch output.
Goes to ground when squelch
opens.
Squelch open : Less than 0.3 V/5 mA
Squelch closed : More than 6.0 V/100 µA
7 13.8 V 13.8 V output when power is ON.
Output current : Max. 1 A
Connected in parallel with ACC(2) pin 7.
8 ALC ALC voltage input.
Control voltage : –4 to 0 V
Input impedance : More than 10 kΩ
Connected in parallel with ACC(2) pin 5.
Rear panel
view
1
2
3
4
5
6
7
8
ACC(2) PIN NO. PIN NAME DESCRIPTION SPECIFICATIONS
1
8 V Regulated 8 V output.
Output voltage : 8 V ±0.3 V
Output current : 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 amateur band)
Output voltage : 0 to 8.0 V
5 ALC Same as ACC(1) pin 8.
6 TRV
Activates [XVERT] input/output
when “HIGH” voltage is applied.
7 13.8 V Same as ACC(1) pin 7.
Rear panel
view
1
2
3
4
5
6
7
Input impedance : More than 10 kΩ
Input voltage : 2 to 13.8 V
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, respectively. (p. 65)