Icom IC-746PRO Instruction Manual page 21

D DATA SOCKET
DATA PIN No.
1 DATA IN
2
3
1 2
4 DATA OUT Data out terminal for 9600 bps operation only.
3 4
5 AF OUT
5 6
Rear panel view
6
D ACC SOCKETS
ACC (1) PIN No. NAME
1 RTTY Controls RTTY keying
2 GND Connects to ground.
3 HSEND Goes to ground when transmitting.
2
4 5
4 MOD
1 3
8
6
7
5
Rear panel view
6 SQLS
7 13.8 V 13.8 V output when power is ON.
8 ALC
ACC (2) PIN No. NAME
1 8 V
2 GND
3 HSEND
2
4
5
4 BAND
1 3
6 7
5 ALC
Rear panel view
6 VSEND Goes to ground when transmitting.
7 13.8 V
NAME
Input terminal for data transmit. (1200 bps: AFSK/9600 bps: G3RUH, GMSK)
GND Common ground for DATA IN, DATA OUT and AF OUT.
PTT P PTT terminal for packet operation. Connect ground to transmit data.
Data out terminal for 1200 bps operation only.
Squelch out terminal. Becomes high (+8 V) when the transceiver receives a signal
which opens the squelch.
P SQL • To avoid unnecessary TNC transmission, connect squelch to the TNC to inhibit trans-
mission when receiving signals.
• Keep audio output at a normal level, otherwise a "P SQL" signal will not be output.
DESCRIPTION
Input/output pin. (HF/50 MHz only)
When grounded, transmits.
Modulator input.
Connects to a modulator.
AF detector output.
AF Fixed, regardless of [AF] position in
default settings. (see notes below)
Squelch output.
Goes to ground when squelch opens.
ALC voltage input.
DESCRIPTION
Regulated 8 V output.
Band voltage output.
(Varies with amateur band)
Input/output pin (144 MHz only)
When grounded, transmits.
PANEL DESCRIPTION
DESCRIPTION
SPECIFICATIONS
"High" level : More than 2.4 V
"Low" level : Less than 0.6 V
Output current : Less than 2 mA
Connected in parallel with ACC(2) pin 2.
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.
Input impedance : 10 kΩ
Input 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
Connected in parallel with ACC(2) pin 7.
Control voltage : –4 V to 0 V
Input impedance : More than 10 kΩ
Connected in parallel with ACC(2) pin 5.
SPECIFICATIONS
Output voltage : 8 V ±0.3 V
Output current : Less than 10 mA
Same as ACC(1) pin 2.
Same as ACC(1) pin 3.
Output voltage : 0 to 8.0 V
Same as ACC (1) pin 8.
Ground level : –0.5 V to +0.8 V
Output current : Less than 20 mA
Input current (Tx) : Less than 200 mA
Same as ACC(1) pin 7.
1
8