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Page 54 FT
DX
1200 OPERATING MANUAL
A B C
INTERFERENCE REJECTION
WIDTH
(
IF DSP BANDWIDTH
)
T
UNING
(
SSB/CW/RTTY/DATA MODES
)
The IF WI'TH tuning system allows you to vary the width of the 'S3 IF passband, to reduce or eliminate interference.
0oreover, the bandwidth may actually be expanded from its default setting, should you wish to enhance incoming sig-
nal ¿delity when interference on the band is low.
1. 5otate the
[
WIDTH
]
knob to the left or right to re-
duce the interference.
A
DVICE:
The freTuency display will show the bandwidth of
the IF passband for 3 seconds whenever the
[
WIDTH
]
knob is turned.
[
WIDTH
]
Knob
5eferring to Figure “
B
”, you can see the default
bandwidth on the SSB mode.
By rotating the
[
WIDTH
]
knob to the left, the
bandwidth will narrow see Figure
A
”, while
rotation of the
[
WIDTH
]
knob to the right, as
depicted in Figure “
C
”, will increase the band-
width.
A B C
The default bandwidths, and total bandwidth ad-
justment range, will vary according to the operat-
ing mode
SSB 0ode 1.8 kH] a 4.0 kH] default .4 kH]).
CW 0ode 00 H] a .4 kH] default .4 kH])
5TTY'$T$ 0odes 00 H] a .4 kH] default
00 H])
Using IF SHIFT and WIDTH Together
The IF SHIFT and Variable IF WI'TH features
together form a very effective interference-¿ght-
ing ¿ltering system.
For example, in Figure “
A
”, you can see how
interference has appeared both on the high
and low sides of the desired signal. 5otate the
[
WIDTH
]
knob, the interference from one side
can be eliminated Figure “
B
”). 1ext, rotate the
[
SHIFT
]
knob to re-position the passband Figure
C
”), the interference on the opposite side can be
removed, without re-introducing the interference
previously eliminated in Figure “
B
”.
ADVICE:
For best interference reduction, the WI'TH and
SHIFT features are the primary tools you should
use, after narrowing the bandwidth WI'TH)
andor adjusting the center of the passband
SHIFT). The Contour control may then yield
additional signal-enhancement benefits on
the net residual bandwidth. (ven more, the IF
12TCH Filter described later) may also be
used, in conjunction with these ¿lter systems, to
signi¿cant advantage.
WIDTH INDICATOR
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
SHIFT SHIFT SHIFT
Desired Signal Desired Signal Desired Signal
QRM
QRM
QRM
QRM
QRM
QRM
IF BANDWIDTH IF BANDWIDTH IF BANDWIDTH
56


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  • Green Light on VFO A and MEM is flashing and no audio. Even tried Factory Reset and still flashing. How do I fix this? Submitted on 6-12-2022 at 07:37

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