Yaesu FT-450D Manuale Utente
Page 31
FT-450D 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.
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.
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.
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.
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.
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.
A B
IF
BANDWIDTH
QRM
(Heterodyne)
QRM
(Heterodyne)
IF
BANDWIDTH
Desired Signal
Desired Signal