Icom IC-751A - Section 4 Circuit Description; 4-1 Receiver Circuits

(§)
RECEIVER
INPUT
[RECEIVE
ANT
INl
This
is an
input
jack
which connects to
the
receiver
RF stage.
©TRANSVERTER
JACK [X-VERTER]
©SPARE
JACK
©GROUND
TERMINAL
©KEY
JACK
©EXTERNAL
SPEAKER
JACK
©ACCESSORY
SOCKET
©DC
POWER SOCKET
[DC 13.8V]
©
IC-EX309
(OPTIONAL)
INTERFACE
UNIT
CONNECTOR
POSITION
ANT
Connect a
suitable
transverter to
this jack
for
operation on
VHF/
UHF
frequencies. The
output is
approximately
30m
V.
This
jack is not
used. It may
be
useful
for
connecting a
personal
accessory.
To
prevent
electrical shocks,
TVI, BCI
and
other problems, be
sure to
ground the
equipment
through the
GROUND
TER-
MINAL.
For best results,
use the
heaviest
gauge wire
or strap
available
and make the
connection as
short as
possible.
For
CW
operation,
connect a
CW
key using
the
supplied
standard
1/4
inch,
3-conductor plug.
The terminal
voltage
from
external
electronic
keyers must
be less
than 0.4
volts DC.
When
using
the IC-751A
internal
iambic
keyer,
connect
an iambic
keyer
paddle using
the
supplied 1/4
inch, 3-conductor
plug.
See
SECTION
4
-
5
and
6
-
4 for
more
information.
Connect
an external
speaker to
this jack,
if
required.
Use a
speaker
with
an
impedance of 4
~
16
ohms
and
remember
the
built-in
speaker
does not
function
when using
the
EXTERNAL
SPEAKER
JACK.
This socket
provides
signals
such
as
T/R
switching,
receiver
output,
modulation
output, etc.
Refer to
SECTION
5
-
6
for more
informa-
tion.
Connect the
DC
power cable
from
the
IC-PS35
internal
power
supply,
the
IC-PS30
or IC-PS15
external
power
supply
or other
suitable
supply.
Refer
to
SECTION 4
-
6
for
more
information.
This
position
is for
the installation
of the
DP-25 connector
from
the
optional IC-EX309
interface unit.
@1C-PS35
(OPTIONAL) AC
POWER
SUPPLY SOCKET
POSITION
This
position is
for the
installation
of the AC
power
socket
when
the
optional
IC-PS35
internal
power supply
is
used.
-
14
-