Operation Manual

Page 31FT-450 OPERATION MANUAL
CONVENIENCE FEATURES
NOTCH
(
INTERFERENCE REJECTION “SIGNALS WITHIN 3 KHZ”
)
The IF Notch filter is a highly effective system that allows you to slice out an interfering beat note or other
carrier signal from inside the receiver passband.
“NOTCH” Indicator
[
DSP
]
button
[
DSP/SEL
]
knob
1. Press the
[
DSP
]
button several times to set the
“>” icon to the “NOTCH” indicator of the DSP
Graphic Display on the display.
2. Press the
[
DSP/SEL
]
knob to engage the IF Notch
filter.
3. Rotate the
[
DSP/SEL
]
knob to adjust the center
frequency of the IF Notch Filter.
You may observe the graphically depicted peak
position of the IF Notch filter in the “NOTCH” indi-
cator of the DSP Graphic Display on the display.
4. To disable the IF Notch filter, press the
[
DSP/SEL
]
button again. The graphically depicted peak po-
sition disappears from the “NOTCH” indicator of
the DSP Graphic Display on the display confirm-
ing that the IF Notch filter is no longer operating.
The performance of the IF Notch filter is
shown in Figure “A”, where the effect of rota-
tion of the
[
DSP/SEL
]
knob is depicted. In
Figure “B”, you can see the notching effect
of the IF Notch filter as you rotate the
[
DSP/
SEL
]
knob to eliminate the incoming interfer-
ence.
IF
BANDWIDTH
QRM
(Heterodyne)
QRM
(Heterodyne)
IF
BANDWIDTH
Desired Signal Desired Signal
DSP/SEL
A B C