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7-8
NOTCH
FILTER
OPERATION
CONTROL
NOTCH
SWITCH
7-9
FILTER SWITCH
OPERATION
-FILTER
SWITCH
7
-10
RIT/^TX
OPERATION
• RIT
OPERATION
This
circuit
provides high attenuation
at
one
particular
frequency
in
the
IF
passband.
It
may
be used
to
reduce
or eliminate
interfering
heterodyne
signals
that
fall
within the
passband
of the
receiver.
1)
Push
the
NOTCH
FILTER SWITCH
to the
ON
position
(IN).
2)
Adjust the
NOTCH
FILTER
CONTROL
to
minimize
inter-
ference.
I
NOTCH
FILTER
CHARACTERISTIC
This switch
selects
the
different
combinations
of the
internal receive
filters.
FILTER
SWITCH
SSB
CW/RTTY
*1
CW/RTTY
NARROW
AM
FM
OUT
2.3kHz
*2
500Hz
500/250HZ
*4
8kHz
15kHz
IN
2.6kHz
*3
2.3kHz
500/250HZ
*5
3kHz
15kHz
*1
:
ON NARROW
or
RTTY
NARROW
mode
requires either
an
optonal
FL-52A
or
FL-53A
narrow
filter.
*2, *3:
Internal preset
switch
S4 on
the
MAIN
unit reverses these
narrow and wide
filters:
FILTER SWITCH OUT:
2.3kHz
FILTER
SWITCH
IN
:
500Hz
*4, *5:
Internal preset
switch
S3 on
the
MAIN
unit
reverses
these
wide and narrow
filters:
FILTER SWITCH OUT: 3kHz
FILTER SWITCH
IN
:
8kHz
By
using the
RIT
circuit,
it is
possible to
shift
the
receive
frequency
up
to
9.9kHz
to either
side
of the transmit
frequency without
mov-
ing
the transmit frequency.
This
is.
useful for fine
tuning
stations
which
call
off
frequency
or for
compensating
for
frequency
drift.
1)
Push
RIT
SWITCH
to turn
ON
the
RIT.
Receive
:
14.267.8MHz
Transmit:
14.267.8MHz
"RIT"
displays.
USB
f~
RIT
1
P
f,
1
R
n n
n
1
/.
L
LI
/.
LI
VfO
A
LI.
LI
LI
1
1)
Push
the
RIT
SWITCH
once
to turn the
RIT
circuit
ON. The
letters
"RIT"
and
the
amount
of
shift
are displayed.
-
36
-
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