Digital Notch Filter (Dnf) Operation - Yaesu FTDX9000D - DATA MANAGEMENT Operation Manual

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The Digital Notch Filter (DNF) is an effective beat-cancelling filter that can null out a number of interfering beat notes
inside the receiver passband. Because this is an Auto-Notch feature, there is no adjustment knob associated with this filter.
MAIN (VFO-A) [ DNF ] switch
Main (VFO-A) Band DNF Operation
Press the Main band's (VFO-A) [ DNF ] switch to engage
the Digital Notch filter. The LED imbedded in the switch
will glow Red, to confirm that the DNF circuit is engaged.
To cancel DNF operation, press the Main band's (VFO-
A) [ DNF ] switch once more. The imbedded LED will go
out, confirming that the Digital Notch Filter is no longer
in operation.
Sub (VFO-B) Band DNF Operation
1. Press the Sub band's (VFO-B) [ RX ] switch to engage
Dual Receive operation.
2. Press the Sub band's (VFO-B) [ DNF ] switch to en-
gage the Digital Notch filter. The LED imbedded in
the switch will glow Red, to confirm that the DNF
circuit is engaged.
To cancel DNF operation, press the Sub band's (VFO-B)
[ DNF ] switch once more. The imbedded LED will go out,
confirming that the Digital Notch Filter is no longer in
operation.
FT 9000D O
DX PERATION
I
NTERFERENCE
N F
IGITAL OTCH ILTER
SUB (VFO-B) [ DNF ] switch
M
ANUAL
R
EJECTION ( S
( DNF ) O
PERATION
SUB (VFO-B) [ RX ] switch
A A A A A
D D D D D VICE VICE VICE
VICE VICE
If a very strong interfering carrier is encountered,
we recommend you first use the IF Notch filter, as
it is the most effective notching tool in the receiver
section.
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IGNALS WITHIN KHZ
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