Yaesu FTDX-9000MP Operation Manual page 33

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 (VFO-A) band
CONTOUR filter response. The CONTOUR filter is
engaged via the CONT switch (#
CONT Button
This button turns the Main (VFO-A) band 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 (#
Quick Note
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/
or raise intelligibility.
Advice
H 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 [ No.078 RX DSP MAIN-CON-
TOUR-LEVEL
] and [
CONTOUR-WIDTH
H 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
FT 9000MP O
F
RONT
below).
above).
No.079 RX DSP MAIN-
].
M
P C
ANEL
the Audio Scope.
NR Knob
This knob selects the optimum Main (VFO-A) band Digi-
tal Noise Reduction response. The Noise Reduction cir-
cuit is engaged via the NR switch (#
NR Switch
This button turns the Main (VFO-A) band 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 (#
VRF/µ Switch
This button turns the Main (VFO-A) band VRF filter
on and off. While activated, the LED inside the but-
ton will glow red.
Quick Point
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 (VFO-A)
band receiver's RF filter for maximum receiver sensi-
tivity (and out-of-band interference rejection).
Quick Point
When the optional RF µ-Tuning Unit is installed, this
knob allows adjustment of the center frequency of the
µ-Tuning filter passband.
NOTCH Knob
This adjusts the center frequency of the Main (VFO-
A) band IF Notch filter, when engaged by the
NOTCH switch (# below).
NOTCH Switch
This button turns the Main (VFO-A) band IF notch
filter on and off. When the IF notch filter is activated,
the LED inside the button will glow red. The Notch
Filter center frequency is adjusted via the NOTCH
knob (# above).
Advice
H The width of the notch may be set to either "Wide"
or "Narrow" via Menu #082 (IF-NOTCH-WIDTH)
in the RX DSP Menu Group. Setting this selection
to "Narrow" will provide a very sharp notch, with
minimal disturbance to the incoming signal wave-form.
H 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 Notch
filter control for the optimum performance. The
effect of the Notch filter adjustments will be easy
to see on the Audio Scope.
ONTROLS
below).
above).
Page 31