Page 60
FT
DX
5000 O
PERATING
M
ANUAL
IF SHIFT O
PERATION
(
SSB/CW/RTTY/PKT M
ODES
)
The IF Shift allows you to vary the DSP filter passband higher or lower, (without changing the pitch of the incoming signal)
to reduce or eliminate interference. Because the carrier tuning frequency is not varied, there is no need to re-tune the
operating frequency when using the IF Shift to eliminating the interference. The total passband tuning range for the IF Shift
system is ±1 kHz.
I
NTERFERENCE
R
EJECTION
(
S
IGNALS
WITHIN
3
KHZ
)
VFO-A IF SHIFT Operation
Press the (
VFO-A
)[
SHIFT
] button. The (
VFO-
A
)[
SHIFT
] 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 SHIFT knob.
Rotate the (
VFO-A
)[
SELECT
] knob to the left or right
to reduce the interference.
Press the (
VFO-A
)[
RESET
] button briefly to quickly
move the filter passband to center.
To turn the IF SHIFT operation “off”, press the (
VFO-
A
)[
SHIFT
] button again. The red LED of the (
VFO-
A
)[
SHIFT
] button turns off, and the filter passband
will move to the center. However, the last setting of
the IF SHIFT control will be retained until you change
it again.
Refer to Figure “
A
” and notice the depiction of the IF
DSP filter as a thick line in the center of the passband,
no shift (the [
SHIFT
] button glows red). In Figure “
B
”,
an interfering signal has appeared inside the original
passband. In Figure “
C
”, you can see the effect of ro-
tating the [
SELECT
](shift) knob and moving the fil-
ter so that the interference is outside of the passband.
VFO-B IF SHIFT Operation
Press the (
VFO-B
)[
SHIFT
] button. The (
VFO-
B
)[
SHIFT
] 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 SHIFT knob.
Rotate the (
VFO-B
)[
SELECT
] knob to the left or
right to reduce the interference.
Press the (
VFO-B
)[
RESET
] button briefly to quickly
move the filter passband to center.
To turn the IF SHIFT operation “off”, press the (
VFO-
B
)[
SHIFT
] button again. The red LED of the (
VFO-
B
)[
SHIFT
] button turns off, and the filter passband
will move to the center. However, the last setting of
the IF SHIFT control will be retained until you change
it again.
(VFO-A)[SELECT] Knob
(VFO-B)[SELECT] Knob
(VFO-B)[SHIFT] Button
[RESET] Button
(VFO-A)[SHIFT] Button
[RESET] Button
A
B
C
IF
BANDWIDTH
IF
BANDWIDTH
IF
BANDWIDTH
Desired Signal
Desired Signal
Desired Signal
QRM
QRM
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.
