Icom IC-751A Instruction Manual

5-5
SSTV
UNIT
Slow Scan
Television
operation is also
possible
with
the IC-751
A.
•
Connect the CAMERA OUTPUT on your
SSTV Unit
to
the ACC
CONNECTOR pin
5
or MIC CONNECTOR
pin
1.
•
The
audio
output signal
(300mVp-p)
is
available from pin 4 and
the ground
is
pin 8.
5
-
6
ACCESSORY
SOCKET
CONNECTIONS
©(D®
®
©®
©
@®©
@®
@
©
®
® ®@
(g).
Outside view
•BAND
CONTROL
VOLTAGE
Various
signals are available
from the accessory
socket such
as
modulation output, receiver
output, T/R changeover,
etc.
PIN
NO.
FUNCTION
1
Output from the
squelch control
stage.
(+8V
when
the squelch Is ON.)
2
13.8 volts
DC interlocked with the
power switch.
3
Connected
to
the push-to-talk, T/R
switch. When
grounded,
the transceiver
changes
to
the
transmit
mode.
4
Output from the receive
detector
stage. Fixed
out-
put regardless of AF
output or AF
gain.
5
Output
from the
transmit
MIC amplifier
stage.
(Input
for the MIC gain
control stage.)
6
8
volts DC output
while transmitting.
(Maximum
output current
is 5mA.)
7
Input
for external
ALC
voltage.
8
Ground.
9
Input
for
RTTY keying (MARK:
HIGH level,
SPACE:
LOW level).
The levels
for MARK and
SPACE may
be
reversed
with
an
internal
switch.
10 NC
(no connection).
11
Input for
TRANSVERTER
control.
Apply
8
volts
DC
to
use
a
transverter
with
the IC-751
A.
12
Reference
voltage
output for band
switching.
13 Band Control
Voltage output.
See below.
14-24
NC (no connection).
NOTE:
The IC-751
A outputs
a band control voltage when the
band of operation
is changed. This
signal automatically
switches
accessory equipment such
as the ICOM linear
amplifier
or antenna tuners.
BAND
(MHz)
BAND CONTROL VOLTAGE
1.8
7.0'-
-8.0V
3.5
6.0-
-6.5V
7 5.0-
-5.5V
14
4.0-
-4.5V
18,21
3.0-
-3.5V
24,
28
2.0-
-2.5V
10
0
-
-
1.2V
-21
-

Icom IC-751A Specifications

General

Brand	Icom
Model	IC-751A
Category	Transceiver
Language	English