Yaesu FTdx5000 Series, Руководство по эксплуатации

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Page 61 FT
DX
5000 O
PERATING
M
ANUAL
WIDTH
(
IF DSP B
ANDWIDTH
)
T
UNING
(
SSB/CW/RTTY/PKT M
ODES
)
The IF Width tuning system allows you to vary the width of the DSP IF filter passband, to eliminate 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.
I
NTERFERENCE
R
EJECTION (S
IGNALS WITHIN
3
KHZ
)
VFO-A WIDTH Operation
 Press the (
VFO-A
)[
WIDTH
] button. The (
VFO-
A
)[
WIDTH
] button glows red, and the center position
of the IF passband will be indicated in the
SUB
DISPLAY-II
window. The (
VFO-A
)[
SELECT
] knob
will now function as the IF WIDTH knob.

Rotate the (
VFO-A
)[
SELECT
] knob to the left or right
to reduce the interference.

Press the (
VFO-A
)[
RESET
] button briefly to set the
bandwidth to default.

To turn the IF WIDTH operation “off”, press the (
VFO-
A
)[
WIDTH
] button again. The red LED of the (
VFO-
A
)[
WIDTH
] button turns off, and the bandwidth will be
set to default. However, the last setting of the IF WIDTH
control will be retained until you change it again.
VFO-B WIDTH Operation
 Press the (
VFO-B
)[
WIDTH
] button. The (
VFO-
B
)[
WIDTH
] button glows red, and the center position
of the IF passband will be indicated in the
SUB
DISPLAY-III
window. The (
VFO-B
)[
SELECT
]
knob will now function as the IF WIDTH knob.

Rotate the (
VFO-B
)[
SELECT
] knob to the left or
right to reduce the interference.

Press the (
VFO-B
)[
RESET
] button briefly to set the
bandwidth to default.

To turn the IF WIDTH operation “off”, press the (
VFO-
B
)[
WIDTH
] button again. The red LED of the (
VFO-
B
)[
WIDTH
] button turns off, and the bandwidth will be
set to default. However, the last setting of the IF WIDTH
control will be retained until you change it again.
Referring to Figure “
B
”, you can see the default band-
width (the [
WIDTH
] button glows red).
By rotating the [
SELECT
](width) knob to the left, the
bandwidth will narrow (see Figure “
A
”). Rotation of
the [
SELECT
](width) knob to the right, as depicted
in Figure “
C
,” will widen the bandwidth.
The default bandwidth, and total bandwidth adjustment
range, will vary according to the operating mode and
the [
NAR
] button setting:
(VFO-A)[SELECT] Knob (VFO-B)[SELECT] Knob
(VFO-B)[WIDTH] Button
[RESET] Button
(VFO-A)[WIDTH] Button
[RESET] Button
A
DVICE
:
You may select the display pattern shown in the
SUB DIS-
PLAY
window from three patterns via Menu item “
019
DISP SELECT
”. See page 122 for details.
 : Default (the [ WIDTH
] button glows red)
IF
BANDWIDTH
IF
BANDWIDTH
IF
BANDWIDTH
A B C
OFF
1.8 kHz - 4.0 kHz / 16 steps (2.4 kHz 
)
500 Hz - 2.4 kHz / 7 steps (2.4 kHz 
)
500 Hz - 2.4 kHz / 7 steps (500 Hz 
)
ON
200 Hz - 1.8 kHz / 9 steps (1.8 kHz 
)
50 Hz - 500 Hz / 10 steps (500 Hz 
)
50 Hz - 500 Hz / 10 steps (300 Hz 
)
MODE
LSB/USB
CW
RTTY
(
LSB
)
/ PKT
(
LSB/USB
)
NAR S
WITCH
N
OTE
:
When rotating the [
SELECT
](
WIDTH
) knob counter-
clockwise, the transition between 50 Hz and 25 Hz band-
width may be accompanied by a “ping” sound, depending
on the amount of noise present. This is a normal condition,
and you should turn down the volume, when wearing head-
phones, to minimize the amplitude of this momentary sound.