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Page 47FT
DX
1200 OPERATING MANUAL
μ-TUNE FILTER
(
REQUIRES THE OPTIONAL RF μ TUNING KIT
)
The 5F Tuning .it provides ultra-sharp 5F selectivity for the front end of the transceiver. Very high Q is made pos-
sible by the narrow-band design. Three 5F Tuning .its are available. The
MTU-160
covers the 1.8 0H] band. The
MTU-80/40
covers the 3. and 7 0H] bands. The
MTU-30/20
covers 10.1 and 14 0H] bands.
When any or all) of the three optional units are connected, they will be automatically adjusted to center on your operat-
ing freTuency.
The narrow bandwidth is especially useful on the low bands, when many strong signals are being received via 1VIS
propagation 1ear Vertical-Incidence Signals) within a narrow bandwidth. The added protection for the 5F stage is es-
pecially helpful in preventing I0' and blocking.
μ-Tune Operation
1. 3ress and hold in the
[
MHz/μT
]
button for one sec-
ond to activate the -Tune ¿lter. The “
μ-Tune
” will
appear on the TFT display. The
[
VFO-B/CLAR
]
knob works as the -TU1I1G knob.
ADVICE:
The -Tune circuit will automatically align itself
to the operating freTuency.
5emember that -Tune only operates on the 14
0H] and lower bands.
. 5otate the
[
VFO-B/CLAR
]
knob to peak the re-
sponse background noise) or reduce interference.
A
DVICE:
You may observe the relative peak point of the
-Tune filter in the Tuning 2ffset Indicator on
the display, while tuning the
[
VFO-B/CLAR
]
knob.
The amount of change in the center freTuency
of the -Tune filter, when rotating the
[
VFO-
B/CLAR
]
knob, can be con¿gured using 0enu
item “
046 uTUNE DIAL STEP
”.
If the ȝ-Tune filter has been manually adjusted
away from the center freTuency, you may press
the
[
CLEAR
]
button to re-center the filter re-
sponse on the current operating freTuency.
3. 3ress and hold in the
[
MHz/μT
]
button for one sec-
ond to disengage the -Tune ¿lter
A
DVICE:
$lternate presses of the
[
MHz/μT
]
button will switch
the -Tune ¿lter between on or off.
A
DVICE:
You may change the indication of the Tuning 2ffset
Indicator to display the -Tune filter continuously
while the -Tune filter is activated. This is 0enu
item “
011 BAR DISPLAY SELECT
”. See “Changing
the Tuning 2ffset Indicator” on the next page for de-
tails of the setting.
The -Tune ¿lters are the most advanced, selective
5F preselector ¿lters ever incorporated into an $ma-
teur 5adio transceiver. The 5F selectivity provided
INTERFERENCE REJECTION
[
MHz/μT
]
Button
[
VFO-B/CLAR
]
Button
by -Tune can be of tremendous value in ensur-
ing Tuiet, intermod-free reception even in the most
crowded bands on a contest weekend. The -Tune
¿lters provide 5F selectivity on the order of a few
do]en kH] at -6 dB, at the expense of a few dB of
system gain on bands where noise ¿gure is seldom
an issue. You will notice that the S-meter deÀection,
when -Tune is engaged, is slightly less than when
it is out of the circuit this is normal. If your antenna
system gain is so low that you cannot hear the band
noise when -Tune is engaged highly unlikely), just
switch it out, to eliminate the slight insertion loss.
TUNING OFFSET INDICATOR
49


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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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