Yaesu FT DX 9000MP CONTEST - DATA MANAGEMENT OPERATION, Operation Manual, Page: 33 / 180

Page 31 FT
DX
9000MP O
PERATION
M
ANUAL
or raise intelligibility.
A
DVICE
:
P
The action of the CONTOUR filter (either null-
ing or peaking of frequency components as you
adjust the center frequency) may be adjusted via
Menu item “
RX DSP 086 MAIN-CONTOUR-
LEVEL ” and “ RX DSP 087 MAIN-CON-
TOUR-WIDTH .”
P
When the External Display (not supplied) is con-
nected, you may use the Audio Scope on the Au-
dio Scope/Oscilloscope page on the External Dis-
play to help you adjust the setting of the Contour
control for the optimum performance. The effect
of the Contour adjustments will be easy to see on
the Audio Scope.
NR Knob
This knob is used to select one of the 15 available noise
reduction parameters for the Main band (VFO-A) receiver
Digital Noise Reduction system. The Noise Reduction
circuit is engaged via the [
NR
] switch (# below).
A
DVICE
:
The Sub band (VFO-B) frequency display will show
the current noise reduction parameter for 3 seconds
whenever the [
NR
] knob is turned.
You may disable this feature (displaying the current noise
reduction parameter) via Menu item “
DISPLAY 022
LEVEL INDICATOR .” See page 148 for details.
NR Switch
This button turns the Main band (VFO-A) Digital
Noise Reduction circuit on and off. When the Digital
Noise Reduction is activated, the LED inside the but-
ton will glow umber. Adjustment of the Noise Reduc-
tion level is provided by the [
NR
] knob (#
above).
VRF/ μ Switch
This button turns the Main band (VFO-A) VRF filter
on and off. While activated, the LED inside the but-
ton will glow red.
Q
UICK
P
OINT
:
When the optional RF μ -Tuning Unit is installed,
pressing this switch will engage the μ -Tuning
preselector function. The μ -Tuning Units provide
much better RF selectivity than any other RF filter in
the Amateur industry, yielding outstanding protection
from high RF levels not far removed from the current
operating frequency.
VRF/ μ Knob
This knob tunes the passband of the Main band (VFO-
A) receiver’s RF filter for maximum receiver sensi-
tivity (and out-of-band interference rejection).
Q
UICK
P
OINT
:
When the optional RF μ -Tuning Unit is installed, this
knob allows adjustment of the center frequency of the
μ -Tuning filter passband.
should never be a circumstance where the tempera-
ture will rise this high, but if you are operating in a hot
environment, in Class A, and are making long trans-
missions, you may wish to reduce the Bias Level closer
to Class AB to reduce the heat dissipation associated
with Class A operation.
SWR Switch
Pressing this switch enables display of the antenna
system SWR; a red LED will light up to confirm your
selection. The SWR measured at the rear panel An-
tenna Jack will be displayed during transmission.
BAND Keys
These keys allow selection of the operating band.
One key is provided for each Amateur band between
1.8 MHz and 50 MHz (except for the 60-meter band,
covered via the Memory system).
As well, direct frequency entry of the desired operat-
ing frequency may be accomplished using these keys.
If you press and hold in the [
ENT
] key (associated
with the [ BAND
] keys) for two seconds, white func-
tion-indication tabs will appear along the bottom of
the monitor screen, indicating the effects of pushing
the various [
BAND
] keys so as to execute commands
associated with the particular display page selected.
Pressing and holding in the [
ENT
] key once more (for
two seconds or more) will disable the command key
tabs, and will restore band selection using these keys.
CONTOUR Knob
This knob selects the desired Main band (VFO-A)
CONTOUR filter response. The CONTOUR filter is
engaged via the [
CONT
] switch (#
below).
A
DVICE
:
The Sub band (VFO-B) frequency display will show
the CONTOUR frequency for 3 seconds whenever the
inner [
CONTOUR
] knob is turned.
You may disable this feature (displaying the CON-
TOUR frequency) via Menu item “
DISPLAY 022
LEVEL INDICATOR .” See page 148 for details.
CONT Button
This button turns the Main band (VFO-A) CONTOUR
filter on and off. When the CONTOUR filter is acti-
vated, the LED inside the button will glow umber. Ad-
justment of the CONTOUR filter’s center frequency
is provided by the [
CONTOUR
] knob (#
above).
Furthermore, in the CW mode, press and hold this but-
ton for 2 seconds to activate the APF (Audio Peak
Filter) which provides a very narrow audio bandwidth;
the LED inside the button will blink umber for 3 sec-
onds, then replaces to continuous glow. The APF cir-
cuit is an automatic circuit, and there is no adjustment
knob for the APF.
Q
UICK
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
allows you (especially) to roll off certain frequency
components inside the remaining passband, but in a
smooth manner that helps restore a natural sound and/
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