Yaesu FT-2000D Operating Manual page 27

F
RONT
NOTCH Switch
This button turns the Main band (VFO-A) receiver's
IF Notch Filter on and off.
When the IF Notch Filter is activated, the peak posi-
tion of the IF Notch Filter is depicted graphically in
the display. The IF Notch Filter center frequency is
adjusted via the [ NOTCH ] knob.
DNF Switch
This button turns the Main band (VFO-A) receiver's
Digital Notch Filter on and off. When the Digital Notch
Filter is activated, the "
play. This is an automatic circuit, and there is no ad-
justment knob for the DNF.
NOTCH Knob
This knob adjusts the center frequency of the Main
band (VFO-A) receiver's IF Notch Filter. The Notch
Filter is engaged via the [ NOTCH ] button.
Initially, the approximate center frequency of the IF
Notch Filter is adjusted by the outer [ COARSE ] knob;
then, fine tuning of the center frequency is adjusted by
the inner [ FINE ] knob.
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The Sub band (VFO-B) frequency display will show
the Notch frequency for 3 seconds whenever the
[ NOTCH ] knob is turned.
You may disable this feature (displaying the Notch fre-
quency) via Menu item "015 diSP LVL IND." See page
117 for details.
SHIFT WIDTH Knobs
SHIFT Knob
The inner [ SHIFT ] knob provides adjustment of the
IF DSP passband, using 20 Hz steps for precise ad-
justment and easy reduction of interference on either
side of your operating frequency. The total adjustment
range is ±1 kHz. The normal operating setting for this
knob is straight up, in the 12 o'clock position.
A :
DVICE
The Sub band (VFO-B) frequency display will show
the shift value of the IF SHIFT for 3 seconds when-
ever the [ SHIFT ] knob is turned.
You may disable this feature (displaying the shift
value of the IF SHIFT) via Menu item "015 diSP
LVL IND." See page 117 for details.
You may shift the Sub band (VFO-B) filter pass-
band via Menu item "044 S-iF LSB SFT" through
"051 S-iF PKT-USB."
FT-2000D O
PERATING
P
ANEL
" icon appears in the dis-
( E )
FM
XCEPT ON MODE
M
ANUAL
C
ONTROLS
WIDTH Knob
The outer [ WIDTH ] knob sets the overall bandwidth
of the IF DSP filter for the Main (VFO-A) receiver.
The center (12 o'clock) position establishes the "de-
fault" bandwidth (for example, 2.4 kHz for SSB);
clockwise rotation of this knob increases the bandwidth
(out to a maximum of 4 kHz), while counter-clock-
wise rotation reduces the bandwidth.
When the NAR (Narrow) filter selection is engaged,
the [ WIDTH ] knob is disabled.
The [ SHIFT ] knob may be used to re-center the pass-
band response on the incoming signal, and you may
find that the CONTOUR and IF Notch Filter may also
help improve intelligibility and/or reduce interference.
See also the discussions of the [ CONTOUR ] knob and
[ NOTCH ] knob.
A :
DVICE
The Sub band (VFO-B) frequency display will show
the width of the IF passband for 3 seconds when-
ever the [ WIDTH ] knob is turned.
You may disable this feature (displaying the width
of the IF passband) via Menu item "015 diSP LVL
IND." See page 117 for details.
When the [ NAR ] button has been pushed, the
[ WIDTH ] knob no longer functions (except the CW
mode). The IF SHIFT system is still fully opera-
tional, however.
CONT Switch
This button turns the Main band (VFO-A) receiver's
CONTOUR filter on and off. When the CONTOUR
Filter is activated, the peak position of the CONTOUR
Filter is depicted graphically in the display. Adjustment
of the CONTOUR filter's center frequency is provided
by the [ CONTOUR ] knob.
Furthermore, in the CW mode, press and hold this but-
ton for 2 seconds to activate the APF (Audio Peak Fil-
ter) which provides a very narrow audio bandwidth;
the peak position of the APF is depicted graphically in
the display. The APF circuit is an automatic circuit,
and there is no adjustment knob for the APF.
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N
OTE
There are times, when you're trying to remove inter-
ference with a sharp DSP filter, that the remaining sig-
nal has a somewhat unnatural sound. This is caused by
the cutting of some frequency components, leaving
other components in excess. The CONTOUR filter al-
lows you (especially) to roll off certain frequency com-
ponents inside the remaining passband, but in a smooth
manner that helps restore a natural sound and/or raise
intelligibility.
DNR Switch
This button turns the Main band (VFO-A) receiver's
Digital Noise Reduction circuit on and off. When the
Digital Noise Reduction is activated, the "
appears in the display. Adjustment of the Noise Re-
duction level is provided by the [ DNR ] knob.
& S
WITCHES
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