Page 53
FT
DX
1200 O
PERATING
M
ANUAL
IF BANDWIDTH
Desired Signal
Desired Signal
Desired Signal
QRM
QRM
IF BANDWIDTH
IF BANDWIDTH
SHIFT
SHIFT
SHIFT
I
NTERFERENCE
R
EJECTION
IF SHIFT O
PERATION
(
SSB/CW/RTTY/PKT M
ODES
)
IF SHIFT allows you to move the
'
S
3
¿
lter passband higher or lower, without changing the pitch of the incoming sig-
nal, and thus reduces or eliminates interference. Because the carrier tuning fre
T
uency is not varied, there is no need to
re-tune the operating fre
T
uency to eliminate the interference. The total passband tuning range for the IF SHIFT system
is
1 kH
]
.
1.
5
otate 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.
5
eferring to Figure “
A
”, note the depiction of the
IF
'
S
3
¿
lter as the thick line, with the [
SHIFT
]
knob in the 1
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
¿
lter passband so
that the interference is outside of the passband.
[SHIFT] Knob
A B C
SHIFT I
NDICATOR
Summary of Contents for FT DX 1200
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