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Yaesu FT-950 Manual

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Page 42 FT-950 OPERATING MANUAL
µ-TUNE FILTER
(
REQUIRES THE OPTIONAL RF µTUNING KIT
)
The RF µTuning Kit provides ultra-sharp RF selectivity for the front end of the transceiver. Very high Q is made possible
by the narrow-band design. Three RF µTuning Kits are available. The MTU-160 covers the 1.8 MHz band. The MTU-80/
40 covers the 3.5 and 7 MHz bands. The MTU-30/20 covers 10.1 and 14 MHz bands.
When any (or all) of the three optional units are connected, they will be automatically adjusted to center on your operating
frequency.
The narrow bandwidth is especially useful on the low bands, when many strong signals are being received via NVIS
propagation (Near Vertical-Incidence Signals) within a narrow bandwidth. The added protection for the RF stage is espe-
cially helpful in preventing IMD and blocking.
µ-Tune Operation
1. Press the
[
µ-TUNE
]
button to activate the µ-Tune fil-
ter. The LED inside the
[
µ-TUNE
]
button glows or-
ange. The
[
SELECT
]
knob works as the µ-TUNING
knob.
ADVICE:
The tuning position of the µ-Tune filter will appear
in the Tuning Offset Indicator on the display for
three seconds, and the “ ” icon will be indi-
cated in the FLT column of the Block Diagram Dis-
play on the display.
INTERFERENCE REJECTION
[
µ-TUNE
]
Button
[
SELECT
]
Knob
Tuning Offset Indicator
[
CLEAR
]
Button
BLOCK DIAGRAM DISPLAY
The µ-Tune circuit will automatically align itself
onto your operating frequency.
Remember that µ-Tune only operates on the 14
MHz and lower bands.
2. Rotate the
[
SELECT
]
knob to peak the response (back-
ground noise) or reduce interference.
ADVICE:
You may observe the relative peak point of the µ-
Tune filter in the Tuning Offset Indicator on the
display, while tuning the
[
SELECT
]
knob.
The amount of change in the center frequency of
the µ-Tune filter, when rotating the
[
SELECT
]
knob by one click, can be configured using Menu
item “032 GENE µT DIAL”.
If you have performed manual adjustment of the µ-
Tune filter center frequency, you may press the
[
CLEAR
]
button to re-center the filter response on
your current operating frequency.
3. Press the
[
µ-TUNE
]
button (or
[
SELECT
]
knob)
momentarily to disengage the µ-Tune filter; the “ ”
icon will be changed to “ ” in the FLT column of
the Block Diagram Display on the display. In this mode,
only the fixed bandpass filter for the current band will
be engaged.
ADVICE:
Alternate presses of the
[
µ-TUNE
]
button or the
[
SE-
LECT
]
knob, will switch the µ-Tune filter between on
or off.
TUNING OFFSET INDICATOR
Block Diagram Display
ADVICE:
The µ-Tune Filter selection will be memorized inde-
pendently on each VFO stack of the VFO-A and VFO-
B.
You may change the indication of the Tuning Offset
Indicator to display the center frequency of the µ-Tune
filter continuously while the µ-Tune filter is activated.
This is Menu item “006 DISP BARSEL”. See Box on
the next page for details of the setting.
QUICK NOTE:
The permeability-tuning concept utilized in the µ-Tune cir-
cuit dates back many decades, as it was incorporated in
such classic transceivers as the FT-101, the FT-901 se-
ries, the FTDX400, and similar models. The µ-Tuning Kit
uses the same circuit as our flag ship model the FTDX9000,
which is the highest development of this circuit concept
ever employed in an Amateur transceiver.
… 44 …


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