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Yaesu FT-950 Manual

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Page 48 FT-950 OPERATING MANUAL
INTERFERENCE REJECTION
IF SHIFT OPERATION
(
SSB/CW/RTTY/PKT/AM MODES
)
IF SHIFT allows you to move the DSP filter passband higher or lower, without changing the pitch of the incoming signal,
and thus reduce or eliminate interference. Because the carrier tuning 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 kHz.
1. Press the
[
SHIFT
]
button. The LED inside the
[
SHIFT
]
button glows orange. The
[
SELECT
]
knob functions
as the IF SHIFT knob. The center position of the IF
passband appears in the SHIFT indicator on the dis-
play.
2. Rotate the
[
SELECT
]
knob to the left or right to re-
duce the interference.
ADVICE:
The frequency display will show the shift value of the
IF SHIFT for 3 seconds whenever the
[
SELECT
]
knob
is turned.
3. Press the
[
CLEAR
]
button to move the filter passband
to center.
ADVICE:
The center position of the IF passband will be memorized
independently on each VFO stack of VFO-A and VFO-B.
Referring to Figure “A”, note the depiction of the
IF DSP filter as the thick line, with the
[
SELECT
(
SHIFT
)]
knob in the 12 o’clock posi-
tion. In Figure “B”, an interfering signal has ap-
peared inside the original passband. In Figure “C”,
you can see the effect of rotating the
[
SELECT
(
SHIFT
)]
knob. The interference level
is reduced by moving the filter passband so that
the interference is outside of the passband.
[
SHIFT
]
Button
[
SELECT
]
Knob
SHIFT Indicator
[
CLEAR
]
Button
IF
BANDWIDTH
IF
BANDWIDTH
IF
BANDWIDTH
Desired Signal Desired Signal Desired Signal
QRMQRM
ABC
… 50 …


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