Yaesu FTDX10, Руководство по эксплуатации, Страница: 45 / 123

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SHIFT, WIDTH
Press and hold the [SHIFT] knob to reset the shift
frequency set by the [SHIFT] knob and the band-
width of the IF filter set by the [WIDTH] knob.
Inner Knob (SHIFT)
IF SHIFT permits moving the DSP filter passband
higher or lower, without changing the pitch of the
incoming signal, and thus reduces or eliminates in-
terference. Because the tuned carrier frequency is
not varied, there is no need to re-tune the operating
frequency to eliminate the interference.
The total passband tuning range for the IF SHIFT
system is ±1.2kHz.
The SHIFT function can be operated individually for
VFO-A and VFO-B.
Rotate the [SHIFT] knob to the left or right to re-
duce interfering signals.
● While the SHIFT function is active, the indicator
on the left side of the [SHIFT] knob will light.
● Rotate the [SHIFT] knob to display the shift offset
of the IF filter (-1200Hz to +1200Hz).
● Press and hold the [SHIFT] knob to quickly move
the filter passband to center.
● On the filter function display area, you can ob -
serve the direction of the shift.
Refer to Figure “A” and notice the depiction of the
IF DSP filter as a thick line in the center of the
passband.
In Figure “B”, an interfering signal has appeared
inside the original passband. In Figure “C", you
can see the effect of rotating the [SHIFT] knob.
The interference level is reduced by moving the fil -
ter passband so that the interference is outside of
the passband.
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
SHIFT knob SHIFT knob SHIFT knob
B A
Desired Signal Desired Signal Desired Signal
QRM QRM
C
Outer Knob (WIDTH)
The IF WIDTH tuning system allows you to vary the
width of the DSP IF passband, to reduce or elimi-
nate interference.
Moreover, the bandwidth may actually be expanded
from its default setting, should you wish to enhance
incoming signal fidelity when interference on the
band is low.
Rotate the [WIDTH] knob counter-clockwise to nar-
row the bandwidth and reduce interference.
● While the WIDTH function is active, the indicator
on the right side of the [WIDTH] knob will light.
● To increase the bandwidth, rotate the knob clock -
wise.
● Rotate the [WIDTH] knob, the IF filter bandwidth
is displayed on the display.
● Press and hold the [SHIFT] knob to return the
bandwidth of the IF filter to its initial value.
● On the filter function display area, you can check
the status of the bandwidth.
WIDTH and SHIFT can be adjusted alter-
nately, while listening for the best reception
point.
CONTOUR and NOTCH may be used to-
gether to effectively eliminate interference
and increase intelligibility
Referring to Figure “B", you can see the default
bandwidth of the SSB mode.
By rotating the [WIDTH] knob to the left, the
bandwidth will narrow (see Figure “A”), while
rotation of the [WIDTH] knob to the right, will
increase the bandwidth as depicted in Figure “C”.
The default bandwidths, and total bandwidth
adjustment range, will vary according to the
operating mode (see table below).
WIDTH knob WIDTH knob WIDTH knob
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
B A C
Operating Mode IF BANDWIDTH
LSB / USB
300 Hz - 4000 Hz
(default: 3000 Hz)
CW-L / CW-U
DATA-L / DATA-U
RTTY-L / RTTY-U
PSK
50 Hz - 3000 Hz
(default: 500 Hz)
AM, FM-N, D-FM-N 9000 Hz
AM-N 6000 Hz
FM, DATA-FM 16000 Hz