If Notch Filter Operation - Yaesu FT DX 3000 Operating Manual

i
nTerFerence
iF NotcH F
ilteR
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.
1. Press the [ NOTCH ] button to activate the Notch fil-
ter. The LED inside the [ NOTCH ] button glows or-
ange and the current "null" position of the NOTCH
filter will appear in the NOTCH indicator on the
display. The [ NOTCH ] knob functions as the Notch
adjustment knob.
2. Rotate the [ NOTCH ] knob to adjust the "null" posi-
tion of the Notch filter.
A :
dvice
The frequency display will show the Notch frequen-
cy for 3 seconds whenever the [ NOTCH ] knob is
turned.
3. To cancel the NOTCH filter, press the [ NOTCH ]
button momentarily. The graphic disappears from the
NOTCH indicator on the display, confirming that the
NOTCH filter is no longer in operation.
A :
dvice
Alternate presses of the [ NOTCH ] button, will
switch the NOTCH filter between on and off.
A :
dvice
 The IF NOTCH Filter selection will be memorized
independently on each VFO stack of VFO-A and
VFO-B.
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peRAtioN
[ NOTCH ] Button
widtH i
NdicAtoR
The performance of the IF NOTCH filter 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 NOTCH
filter as you rotate the [ NOTCH ] knob to elimi-
nate the interfering heterodyne.
A
Desired Signal
QRM
(Heterodyne) (Heterodyne)
IF BANDWIDTH
FT 3000 O
DX
)
odeS
B
Desired Signal
QRM
IF BANDWIDTH
NOTCH
M
peraTing anual