Cw Operation; Am Operation - Icom ic-751a Instruction Manual

(2)
CW
NARROW RECEIVING
amBSI cwBBD
ssbBMrttyBE
The IC-751A has already
FL-32A (500Hz/-6dB)
filter
installed.
If
an optional
narrow
filter
is
installed,
push
the
FUNCTION
SWITCH,
then the
CW
SWITCH
to select
the
narrow
filter
thereby
improving the receiver
selectivity
with higher
shape factor.
Background
noise
is
reduced and the
signal-to-noise ratio
(S/N)
is
improved with the
narrow
filter
for
more
enjoyable listening
condi-
tions.
•OPTIONAL
FI
LTERS
1
)
The
chart
shows
the optional
filters
available.
FILTER
CENTER
FREQUENCY
CHARACTERISTICS
(BANDWIDTH)
-6dB
-60dB
FL-52A
455kHz
500Hz 1.0kHz
FL-53A
455kHz 250Hz
480Hz
2)
Push the
FUNCTION SWITCH,
then
the
CW
SWITCH
to select
the
CW
NARROW
mode. The
GW NARROW
INDICATOR
lights
when
the function
is
activated.
(3)
CW
TRANSMITTING
NOTE:
See
SECTION
4
-
5
CW KEY
for
CW
key
connections.
3)
Once
the
CW NARROW
mode
is
selected,
follow the instructions
in
the
CW RECEIVING
section.
1)
Insert
the
CW
key
plug into
the
KEY JACK
on the
rear
panel of
the
IC-751A.
2)
Set the switches
and
controls
as
shown
in
the chart.
SWITCH/CONTROL POSITION
RF
POWER MAX. CLOCKWISE
METER
Po
VOX GAIN
OFF
(MAX.
COUNTERCLOCKWISE)
3) Select
the transmit
mode
with the
T/R SWITCH.
4)
Operate the
CW
key.
The
meter
movement
indicates
that a signal
is
being transmitted.
•
CW
SIDETONE
MONITOR An
700Hz sidetone
oscillator
is
provided to
monitor keying
when
in
the
CW
mode.
The
MONITOR LEVEL
CONTROL
varies
the
volume of the tone.
This control
is
located
on
the
top panel of the
transceiver.
•
Rotate the
MONITOR LEVEL
CONTROL
clockwise to increase
the
volume
of the oscillator
tone.
The
transceiver
AF GAIN
CONTROL
also varies
the
volume.
•
BREAK-IN
OPERATION Refer to
SECTION
7
-
4
for
semi
or
full
break-in
CW
operation.
6-5
AM OPERATION
(1)
AM
RECEIVING Set
all
controls as stated in
SECTION
6
-
1
SETTINGS.
1)
Push IN the
POWER
SWITCH.
2)
Select
the desired
band
of operation.
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