Icom IC-78 Instruction Manual page 8

1
PANEL DESCRIPTION
D
ACC SOCKET INFORMATION
• ACC socket
ACC
13
9 10 11 12
5 6 7 8
1 2 3 4
Rear panel
view
• When connecting the ACC conversion cable (OPC-599)
13
9 10 11 12
5 6 7 8
1 2 3 4
When the SEND terminal controls an inductive load (such as a relay), a counter-electromotive force can cause the
transceiver to malfunction or other 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.
[Example]
ACC
socket
eSEND
i13.8V
5
PIN # NAME DESCRIPTION
1 8 V Regulated 8 V output.
2 GND Connects to ground.
Input/output pin.
3 SEND Goes to ground when transmitting.
When grounded, transmits.
4 BDT Data line.
5 BAND Band voltage output.
6 ALC ALC voltage output.
7 NC —
8 13.8 V 13.8 V output when power is ON. Output current: Maximum 1 A
9 TKEY Key line.
10 FSKK RTTY key input.
11 MOD Modulation input.
AF detector output.
12 AF
Fixed, regardless of [AF] position. Output level:
Squelch output.
13 SQLS
Goes to ground when squelch opens. SQL closed:
�
2
5
4
�
3
1
�
8
6 7
�
ACC 1
�
2
5
4
�
3
1
�
6 7
�
ACC 2
Switching diode
Relay
Output voltage: 8 V ±0.3 V
Output current: Less than 10 mA
—
Ground level:
Input current:
—
Control voltage: –4 V to 0 V
Input impedance: More than 10 kΩ
—
—
Ground level:
Input current:
Input impedance: 10 kΩ
Input level:
Output impedance: 4.7 kΩ
SQL open:
�
FSKK AF
�
GND SQLS
�
SEND 13.8 V
�
MOD ALC
�
8 V ALC
�
GND NC
�
SEND 13.8 V
BAND
To a non-Icom
linear amplifier
SPECIFICATIONS
–0.5 V to 0.8 V
Less than 20 mA
—
–0.5 V to 0.8 V
Less than 10 mA
Approximately 100 mV rms
100–300 mV rms
Less than 0.3 V/5 mA
More than 6.0 V/100 µA