Yaesu FT-450D 사용자 설명서
Page 29
FT-450D O
PERATION
M
ANUAL
SHIFT (I
NTERFERENCE
R
EJECTION “S
IGNALS
WITHIN
3
KHZ
”
)
IF Shift allows you to vary the DSP filter passband higher or lower, without changing the pitch of the incoming
signal, so as to reduce or eliminate interference. Because the carrier tuning frequency is not varied, there is no
need to re-tune the operating frequency when eliminating the interference. The total passband tuning range for
the IF Shift system is ±1 kHz.
signal, so as to reduce or eliminate interference. Because the carrier tuning frequency is not varied, there is no
need to re-tune the operating frequency when eliminating the interference. The total passband tuning range for
the IF Shift system is ±1 kHz.
C
ONVENIENCE
F
EATURES
Rotate the [SHIFT] knob to the left or right to reduce
the interference.
the interference.
You may observe the position of the passband in the
“SHIFT” indicator of the DSP Graphic Display on the
display.
“SHIFT” indicator of the DSP Graphic Display on the
display.
“SHIFT” Indicator
[SHIFT] knob
[SHIFT] K
NOB
F
ULLY
C
OUNTER
-C
LOCKWISE
[SHIFT] K
NOB
12
O
’
CLOCK
P
OSITION
[SHIFT] K
NOB
F
ULLY
C
LOCKWISE
Referring to Figure “A”, note the depiction of
the IF DSP filter as the thick line, with the
[SHIFT] knob in the 12 o’clock position. 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 to reduce the interference level by mov-
ing the filter passband so that the interfer-
ence is outside of the passband.
the IF DSP filter as the thick line, with the
[SHIFT] knob in the 12 o’clock position. 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 to reduce the interference level by mov-
ing the filter passband so that the interfer-
ence is outside of the passband.
A B C
IF
BANDWIDTH
IF
BANDWIDTH
IF
BANDWIDTH
Desired Signal
Desired Signal
Desired Signal
QRM
QRM