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Page 52 FT
DX
1200 OPERATING MANUAL
INTERFERENCE REJECTION
CONTOUR CONTROL OPERATION
The Contour ¿lter system provides a gentle perturbation of the IF ¿lter passband. The Contour is set to either suppress,
or boost speci¿c freTuency components, and thus enhances the sound and readability of a received signal.
1. 3ress the
[
CONT/APF
]
button to activate the Con-
tour ¿lter. The 'S3 graphic display will illuminate
and the current “null” or “peak”) position of the
Contour ¿lter will appear in the C21T2U5 indica-
tor on the display.
. 5otate the
[
CONT/APF
]
knob to achieve the most
natural-sounding audio reproduction on the incom-
ing signal.
A
DVICE:
The display will show the Contour freTuency for 3
seconds whenever the
[
CONT/APF
]
knob is turned.
3. To cancel Contour tuning, press the
[
CONT/APF
]
button momentarily.
A
DVICE:
$lternate presses of the
[
CONT/APF
]
button will
switch the Contour ¿lter between on and off.
A
DVICE:
The Contour ¿lter level either a null or a peak) may
be adjusted using 0enu item “
108 CONTOUR LEV-
EL
”. The factory default setting is for a null of ±1
dB).
The bandwidth over which the Contour ¿lter effect
is applied may be adjusted using 0enu item “
109
CONTOUR WIDTH
”. The factory default setting is
10. When the set value is increased, the bandwidth
becomes wider.
5efer to Figure
B
”, this illustrates an “inden-
tation” of the Contour filter in the center of
the passband. The Contour filter places a low-
Q “notch” in the passband, per the settings of
0enu items “
108 CONTOUR LEVEL
” and “
109
CONTOUR WIDTH
referenced above). Counter-
clockwise rotation to the left) of the
[
CONT/
APF
]
knob causes the notch to move toward
a lower freTuency within the passband, while
clockwise rotation to the right) causes the notch
to move toward a higher freTuency within the
passband. By removing interference or unwanted
freTuency components of the incoming signal,
it is possible to make the desired signal rise out
of the background noiseinterference, enhancing
intelligibility.
QUICK POINT:
By judicious use of the Contour ¿lter, the “shoulder” of the passband response may be altered, or components may be
removed from within the passband, allowing the desired signal to rise above the background noise and interference in a
manner not obtainable with other ¿ltering systems.
[
CONT/APF
]
Button
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
CONT/APF CONT/APF CONT/APF
[CONT/APF]
Knob
A B C
CONTOUR INDICATOR
54


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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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