Icom IC-751A - Monitor Operation

3)
RIT function
activated.
Receive ; 14.2639MHz
Transmit:
14.2678MHz
USB
RIT
/
‘
/.
PB
1.8
-
3.
3 0
1
VFO t
3)
As with
the RIT
function,
the
amount
of
shift
selected
with
the
INCREMENTAL
TUNING
CONTROL
Is
maintained
in
a
me-
mory
whether
the
^TX
function
is
ON or
OFF.
A shift
value
selected
while
the
RIT
was
activated
becomes
the
zlTX
shift
when
the
MX
function
Is turned
ON.
Push
RIT SWITCH
to turn
OFF
the RIT.
Push
ATX SWITCH
to turn ON the
ATX function.
Receive
:
14.2678MHz
Transmit:
14.2678MHz
Receive :
14.2678MHz
Transmit:
14.2639MHz
USB
AJt
8 s
i
1
U
zt
c
1
i.CO
18-3
5 0
1
VfO
A
4)
RIT already
activated.
Receive
: 14.2639MHz
Transmit:
14.2678MHz
USB
mi
1
8.
PB
18
-
3.
3 0
!
»f0
»
4)
If
the RIT
and
idTX
functions
are
both
activated,
the
receive
and
transmit
frequencies
will
be equal
but shifted
from
the
displayed
frequency
by the shift
value.
Varying
the
INCREMENTAL
TUNING
CONTROL
changes
both
the
transmit
and
receive
frequencies
simultaneously.
Push
ATX SWITCH
to
turn
ON thezlTX function.
Push RIT SWITCH
to turn OFF
the RIT
function.
Receive : 14.
2639MHz
Transmit: 14.2639MHz
Receive
:
14.2678MHz
Transmit;
14.2639MHz
USB
RIT sn
USB
<)TI
/ V.
? B 1
B
'-DO
n 1
./ LI
1
I8PB
IB
-DO
n
1
D.
D
LI
1
VFO A
m A
5)
Push ^TX SWITCH to turn OFF
the
^TX
func-
tion.
5)
Push the
ATX
SWITCH
again
to
turn OFF
the
ATX
function. The
letters "^TX" and
the
amount of
shift are
no longer
displayed.
6)
When
the ATX function
is
OFF,
the transmit and receive
fre-
quencies are
as indicated on the
frequency
display
regardless of
what
amount of shift
is
selected.
Activation of
the ^TX
function
recalls the shift value
from memory.
7)
To add the ATX shift value
to
the
displayed frequency,
push the
FUNCTION SWITCH,
then push the
RIT//4TX CLEAR
SWITCH.
The
value
of
the ATX shift
automatically
resets
to 0.0.
7-11
MONITOR OPERATION
The transmit
IF
signal may
be monitored while using
SSB
if desired.
This
circuit is included
to allow
checking
of the quality
of the
trans-
mitted
signal,
especially useful when using the RF speech com-
pressor.
1)
Turn the MONITOR
SWITCH on the top
cover ON.
2)
Adjust the MONITOR LEVEL CONTROL on the top
panel for
a
comfortable
audio
level.
3)
Wear
headphones while using the monitor function
to
prevent
howling sounds caused
by
feedback.
See SECTION
3
-
3 TOP PANEL for the control and switch
locations.
38
-