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Page 43FT-950 OPERATING MANUAL
ADVICE:
The µ-Tune filters are the most advanced, selective RF preselector filters ever incorporated into an Amateur Radio
transceiver. The RF selectivity provided by µ-Tune can be of tremendous value in ensuring quiet, intermod-free recep-
tion even in the most crowded bands on a contest weekend. The µ-Tune filters provide RF selectivity on the order of a
few dozen kHz at -6 dB, at the expense of a few dB of system gain on bands where noise figure is seldom an issue. You
will notice that the S-meter deflection, when µ-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 µ-Tune is engaged (highly
unlikely), just switch it out, to eliminate the slight insertion loss.
As you tune around on an amateur band with µ-Tune engaged, the microprocessor automatically commands the stepper
motor driving the toroid core stack to center the filter on your current operating frequency. You may, however, use the
[
SELECT
(
µ-TUNE
)]
knob to skew the filter response to one side or the other from your operating frequency, to deal
with heavy interference on one side. To re-center the µ-Tune filter on your operating frequency, and eliminate any
offset, press the
[
CLEAR
]
button.
INTERFERENCE REJECTION
µ-TUNE FILTER
(
REQUIRES THE OPTIONAL RF µTUNING KIT
)
Changing the Tuning Offset Indicator
1. Press the
[
MENU
]
button to engage the Menu
mode.
2. Rotate the
[
SELECT
]
knob to select Menu item
006 DISP BARSEL”.
ADVICE:
Press the
[
SELECT
]
knob to toggle the Menu item
display between “006 DISP” and “BARSEL”.
3. Rotate the
[
CLAR/VFO-B
]
knob to select “u-tn
(µ-Tune)” (replacing the default “C-tn (CW TUN-
ING)” selection).
4. Press and hold in the
[
MENU
]
button for one sec-
ond to lock in the new setting and exit to normal
operation.
[
CLAR/VFO-B
]
Knob
[
MENU
]
Button
[
SELECT
]
Knob
1. Connect the external equipment between the µ-TUNE
IN and µ-TUNE OUT jacks on the rear panel.
2. Press the
[
µ-TUNE
]
button, then press the
[
SELECT
]
knob. The receive signal will pass through the external
equipment. In this case, the “ ” and “ ” icons
will be shown in the FLT column of the VFD display
Block Diagram.
IMPORTANT NOTICE!
When
[
µ-TUNE
]
is enabled, the FT-950 cannot
receive a signal without an external device of
jumper cable between the µ-TUNE IN and µ-
TUNE OUT jacks.
[
µ-TUNE
]
Button
[
SELECT
]
Knob
Block Diagram Display
BLOCK DIAGRAM DISPLAY
3. Press the
[
µ-TUNE
]
button (or
[
SELECT
]
knob) again,
the receive signal will bypass the external equipment
and be applied directly to the transceiver front-end cir-
cuit. The “ ” icon will disappear from the VFD dis-
play (only the “ ” icon will be shown).
ADVICE:
Alternate presses of the
[
µ-TUNE
]
button or the
[
SE-
LECT
]
knob, will switch the receive signal between
the external equipment or the direct front-end receive
circuit.

Advice
If you want to use an external bandpass filter or preamplifier, you may connect it between the µ-TUNE IN and µ-TUNE
OUT jacks on the rear panel.
45


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