If Shift Operation; ( Ssb/Cw/Rtty/Pkt Modes ) - Yaesu FT dx 1200 Operating Manual

iF ShiFt o
IF SHIFT allows you to move the DSP filter passband higher or lower, without changing the pitch of the incoming sig-
nal, and thus reduces or eliminates 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. Rotate the [ SHIFT ] knob to the left or right to re-
duce the interference.
A :
dvice
The display will show the shift value of the IF
SHIFT for 3 seconds whenever the [ SHIFT ] knob is
turned.
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. The interference
level is reduced by moving the filter passband so
that the interference is outside of the passband.
A
Desired Signal Desired Signal
QRM
IF BANDWIDTH IF BANDWIDTH
SHIFT
FT 1200 O
DX peraTing
i
nterference
( SSb/cw/rtty/pkt M
perAtion
B C
Desired Signal
QRM
IF BANDWIDTH
SHIFT SHIFT
M
anual
r
ejection
)
odeS
[ SHIFT ] Knob
ShiFt i
ndicAtor
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