Yaesu FT DX 9000MP CONTEST - DATA MANAGEMENT OPERATION, Руководство по эксплуатации

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Page 70 FT
DX
9000MP O
PERATION
M
ANUAL
CONT
(
C
ONTOUR
)
C
ONTROL
O
PERATION
The Contour filtering system provides a gentle perturbation of the IF filter passband, so as to suppress or enhance certain
frequency components modestly, so as to enhance the natural-sounding received signal.
IIIII
NTERFERENCE NTERFERENCE
NTERFERENCE NTERFERENCE NTERFERENCE
R R R R R
EJECTION EJECTION
EJECTION EJECTION EJECTION
(S(S(S(S(S
IGN IGN
IGN IGN
IGNALS ALS
ALS ALS
ALS WITHIN WITHIN
WITHIN WITHIN
WITHIN
3 3
3 3
3
KHZ KHZ
KHZ KHZ
KHZ
)))))
U
SING
C
ONTOUR ON THE
M
AIN
(VFO-A) R
ECEIVER
1. Press the Main (VFO-A) [ CONT
] switch. The LED
imbedded in the switch will glow Red to confirm that
the Contour filter is engaged.
2. Rotate the Main (VFO-A) [ CONTOUR
] knob to
achieve the most natural-sounding audio reproduction
on the incoming signal. To cancel Contour tuning, press
the Main (VFO-A) [
CONT
] switch once more.
A A
A A A
D D D D DVICE VICE VICE VICE VICE
The Sub band (VFO-B) frequency display will show the CONTOUR frequency for 3 seconds whenever the
[
CONT
] knob is turned.
You may disable this feature (displaying the CONTOUR frequency) via Menu item “ DISPLAY 022 LEVEL
INDICATOR .” See page 148 for details.
The TFT’s Audio Scope (on the “Oscilloscope” page) is particularly useful when adjusting the Contour control. Not
only can you see the effect of the notch/peak of the Contour system, but you also can see the position of the notch/
peak with respect to frequency components of interest on the incoming signal. You may then observe (on the Audio
Scope) the effect of the Contour control while listening to the effect on the signal, and this will help build your
intuition on how best to use Contour tuning in the future.
The Width of the Contour filter effect, and the degree of nulling or peaking, may be adjusted using the menu.
The Contour filter’s level (either nulling or peaking) may be adjusted using Menu Item “ RX DSP 086 MAIN-
CONTOUR-LEVEL ” for Main band (VFO-A) and “ RX DSP 089 SUB-CONTOUR-LEVEL ” for Sub
band (VFO-B). The factory default setting is –15.
The bandwidth over which the Contour filter effect is applied may be adjusted using Menu Item “
RX DSP
087 MAIN-CONTOUR-WIDTH ” for Main band (VFO-A) and “ RX DSP 090 SUB-CONTOUR-WIDTH ”
for Sub band (VFO-B). The factory default setting is 10.
MAIN (VFO-A)[CONT] Switch
MAIN (VFO-A)[CONTOUR] Knob
SUB (VFO-B)[CONT] Switch
SUB (VFO-B)[CONT] Knob
VDD TEMP SWR BIAS
U
SING
C
ONTOUR ON THE
S
UB
(VFO-B) R
ECEIVER
1. Pressing the Sub (VFO-B) band’s [
RX
] switch will
engage Dual Receive operation.
When the imbedded LED grows green, this is your
confirmation that Dual Receive is in operation.
2. Press the Sub (VFO-B) [ CONT
] switch. The LED im-
bedded in the switch will glow Orange, confirming
that the Contour filter is engaged.
3. Rotate the Sub (VFO-B) [ CONT
] knob to achieve the
most natural-sounding audio reproduction on the in-
coming signal. To cancel Contour tuning, press the
Sub (VFO-B) [
CONT
] switch once more.