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Page 56 FT
DX
1200 OPERATING MANUAL
INTERFERENCE REJECTION
IF NOTCH FILTER OPERATION
(
SSB/CW/RTTY/DATA/AM MODES
)
The IF 12TCH ¿lter is a highly effective system that allows you to slice out an interfering beat note or other carrier
signal from inside the receiver passband.
1. 3ress the
[
NOTCH
]
button to activate the 1otch
filter. The 'S3 graphic display will illuminate and
the current “null” position of the 12TCH ¿lter will
appear in the 12TCH indicator on the display. The
[
NOTCH
]
knob functions as the 1otch adjustment
knob.
. 5otate the
[
NOTCH
]
knob to adjust the “null” posi-
tion of the 1otch ¿lter.
A
DVICE:
The freTuency display will show the 1otch freTuen-
cy for 3 seconds whenever the
[
NOTCH
]
knob is
turned.
3. To cancel the 12TCH filter, press the
[
NOTCH
]
button momentarily. The graphic disappears from the
12TCH indicator on the display, con¿rming that the
12TCH ¿lter is no longer in operation.
A
DVICE:
$lternate presses of the
[
NOTCH
]
button, will
switch the 12TCH ¿lter between on and off.
A
DVICE:
The bandwidth of the 12TCH ¿lter either narrow
or wide) may be adjusted using 0enu item “
111
IF NOTCH WIDTH
”. The factory default setting is
“WI'(”.
[
NOTCH
]
Button
The performance of the IF 12TCH ¿lter is illus-
trated in Figure “
A
”, where the effect of rotation
of the
[
NOTCH
]
knob is depicted. In Figure “
B
you can see the notching effect of the IF 12TCH
¿lter as you rotate the
[
NOTCH
]
knob to elimi-
nate the interfering heterodyne.
A B
Desired Signal Desired Signal
QRM
(Heterodyne)
QRM
(Heterodyne)
IF BANDWIDTH IF BANDWIDTH
NOTCH
NOTCH INDICATOR
58


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  • Green Light on VFO A and MEM is flashing and no audio. Even tried Factory Reset and still flashing. How do I fix this? Submitted on 6-12-2022 at 07:37

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