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Page 45FT
DX
1200 OPERATING MANUAL
CONVENIENCE FEATURES
RECEIVER OPERATION
(
FRONT END BLOCK DIAGRAM
)
The
FT
DX
1200
includes a wide range of special features to suppress the many types of interference that may be encoun-
tered on the HF bands. However, real world interference conditions are constantly changing, so optimum setting of the
controls is somewhat of an art, reTuiring familiarity with the types of interference and the subtle effects of some of the
controls. Therefore, the following information is provided as a general guideline for typical situations, and a starting
point for your own experimentation.
The
FT
DX
1200
interference-¿ghting circuitry begins in its “5F” stages, and continues throughout the entire receiver
section.
FT
DX
1200
allows con¿guration of the features described below.
R. FLT
(
,)5RR¿QJ)LOWHUV
)
Three 5oofing filters, of 1 kH], 6 kH], and 3 kH]
bandwidths, are provided in the First IF, right after the
first mixer. These filters are automatically selected to
provide narrow-band selectivity to protect the following
IF and 'S3 stages. The automatically selected ¿lter may
be manually changed by the operator, if desired, for spe-
cial operating circumstances.
CONTOUR Filter
The 'S3 Contour filter has the uniTue ability to pro-
vide either a null or a peak in tunable segments of the
receiver passband. You may suppress interference and
excessive freTuency components on an incoming signal,
or you may peak those tunable freTuency segments. The
level of the null or peak, and the bandwidth, over which
it is applied, are adjustable via the 0enu.
IF SHIFT
The passband center freTuency of the IF 'S3 ¿lter may
be moved up or down by adjusting this control.
IF WIDTH
The width of the IF 'S3 ¿ltering may be adjusted using
this control.
IF NOTCH
The IF 1otch ¿lter is a high-Q notch ¿lter that can elim-
inate, or signi¿cantly reduce an interfering carrier.
DNF
(
'LJLWDO1RWFK¿OWHU
)
When multiple interfering carriers are encountered dur-
ing reception, the 'igital 1otch Filter can signi¿cantly
reduce the level of these signals.
DNR
(
Digital Noise Reduction
)
The 'S3’s 'igital 1oise 5eduction '15) feature uti-
li]es 1 different mathematical algorithms to analy]e
and suppress different noise pro¿les encountered on the
HF0 0H] bands. Choose the selection that provides
the best noise suppression, and allows the signal to rise
up out of the noise.
AGC
The $GC system is highly adaptable to changing signal
and fading characteristics, making reception possible
under the most dif¿cult conditions.
F
RONT END BLOCK DIAGRAM
47


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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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