Yaesu FT DX 9000 CONTEST - 2, Руководство по эксплуатации

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Page 57 FT
DX
9000 C
ONTEST
O
PERATION
M
ANUAL
IF Shift system may be
observed on the LCD
B
C
A
I
NTERFERENCE
R
EJECTION
(S
IGNALS WITHIN
3
KHZ
)
IF SHIFT O
PERATION
(
SSB/CW/RTTY/PKT M
ODES
)
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.
Rotate the SHIFT (# ) control to the left or right to
reduce the interference.
Advice
The position of the IF Shift system may be observed on
the LCD.
Referring to Figure (A), note the depiction of the
IF DSP filter as the thick line, with the SHIFT
control in the 12 o’clock position. In Figure (B),
an interfering signal has appeared inside the origi-
nal passband. In Figure (C), you can see the effect
of rotating the SHIFT control so as to reduce
the interference level by moving the filter pass-
band so that the interference is outside of the pass-
band.
IF BANDWIDTH
Desired Signal Desired Signal
QRM
QRM
IF BANDWIDTH IF BANDWIDTH
IF Shift system may be
observed
SHIFT knob