Equires The Optional - Yaesu FT DX 1200 Operation Manual

μ-T F
UNE
The F Tuning it provides ultra-sharp F selectivity for the front end of the transceiver. Very high Q is made pos-
sible by the narrow-band design. Three F Tuning its are available. The MTU-160 covers the 1.8
MTU-80/40 covers the 3. and 7
When any or all) of the three optional units are connected, they will be automatically adjusted to center on your operat-
ing fre uency.
The narrow bandwidth is especially useful on the low bands, when many strong signals are being received via
propagation ear Vertical-Incidence Signals) within a narrow bandwidth. The added protection for the F stage is es-
pecially helpful in preventing I
μ-Tune Operation
ress and hold in the [ MHz/μT ] button for one sec-
1.
ond to activate the -Tune lter. The "μ-Tune" will
appear on the TFT display. The [ VFO-B/CLAR ]
knob works as the -TU I G knob.
A :
DVICE
The -Tune circuit will automatically align itself
to the operating fre uency.
emember that -Tune only operates on the 14
H and lower bands.
otate 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
the display, while tuning the [ VFO-B/CLAR ]
knob.
The amount of change in the center fre uency
of the -Tune filter, when rotating the [ VFO-
B/CLAR ] knob, can be con gured using
item "046 uTUNE DIAL STEP".
If the -Tune filter has been manually adjusted
away from the center fre uency, you may press
the [ CLEAR ] button to re-center the filter re-
sponse on the current operating fre uency.
ress and hold in the [ MHz/μT ] button for one sec-
3.
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 ffset
Indicator to display the -Tune filter continuously
while the -Tune filter is activated. This is
item "011 BAR DISPLAY SELECT". See "Changing
the Tuning ffset Indicator" on the next page for de-
tails of the setting.
The -Tune lters are the most advanced, selective
F preselector lters ever incorporated into an ma-
teur adio transceiver. The F selectivity provided
FT 1200 O
DX PERATING
I
NTERFERENCE
( R
ILTER

EQUIRES THE OPTIONAL

H bands. The MTU-30/20 covers 10.1 and 14
and blocking.
ffset Indicator on
enu
enu
M
ANUAL
R
RF μ T
UNING
H bands.
T O
UNING FFSET
by -Tune can be of tremendous value in ensur-
ing uiet, intermod-free reception even in the most
crowded bands on a contest weekend. The -Tune
lters provide F 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 de ection,
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.
EJECTION
)
K
IT
H band. The
VIS
[ MHz/μT ] Button
[ VFO-B/CLAR ] Button
I
NDICATOR
Page 47