Icom IC-751A - 4-5-5 Matrix Unit

3)
Push the
AM
SWITCH.
-FILTER
SWITCH
(2)
AM TRANSMITTING
6-6
FM OPERATION
(1)
FM RECEIVING
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BQ3
SSB
RTTY|SQ3
0
Q Q
!Q
•SQUELCH FUNCTION
Raises the
threshold level.
SQUELCH
-®-TONE
4)
Tune in
an
AM
signal with
the
TUNING
CONTROL
using
the
meter to
peak the
signal.
5)
Push the
FILTER
SWITCH to
select
the
narrow
receive
selectivity.
FILTER SWITCH
BANDWIDTH
ON
(IN)
3kHz
OFF
(OUT)
8kHz
NOTE: The
PBT
CONTROL
(passband
tuning)
has
no
effect in
the
AM mode.
6)
Refer to
SECTION 10
-
1
for
installation
instructions
for the
optional
FL-33
crystal
filter.
Transmitting an AM
signal is essentially the
same
as
for SSB trans-
mission.
1)
Select
the transmit
mode with
either the
T/R SWITCH or
the
PTT SWITCH
on the
microphone.
2)
Turn the
RF POWER CONTROL
maximum clockwise or set
it
to
obtain
the desired power
output.
3)
Set
the METER
SWITCH to the Po
position.
4)
Adjust
the MIC GAIN
CONTROL
for
a
slight
indication
of the
meter
needle while
speaking into
the
microphone in a
normal
voice.
NOTE: MIC
GAIN CONTROL
settings
which
are
too
high result
in overmodulation
and a
distorted signal.
Set the MIC
GAIN
carefully.
5)
The speech
compressor (COMP
SWITCH) should
be turned
OFF
to
prevent
overmodulation or distortion.
6)
Use the
FILTER SWITCH
to
select
the
widest
selectivity
position.
1
)
Push the
FUNCTION SWITCH, then the
FM SWITCH.
2)
Set
the other switches
and controls the same as
for SSB recep-
tion.
The
PBT CONTROL,
NOTCH SWITCH and
CONTROL, NOISE
BLANKER SWITCH
and CONTROL, AGC
SWITCH and
FILTER SWITCH
do
not
function
in
this mode.
3)
When tuning
an
FM
signal, tune
for maximum signal strength as
indicated on
the meter with the clearest
audio.
SQUELCH: If closed, the squelch mutes
all noise from the
speaker when no signal is
received. This
Is
useful
while waiting for another station to
call.
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