Page 31
FT-450 O
PERATION
M
ANUAL
C
ONVENIENCE
F
EATURES
NOTCH
(
I
NTERFERENCE
R
EJECTION “S
IGNALS
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
