Specifications

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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.

QUICK NOTE:

The permeability-tuning concept utilized in the μ-Tune circuit dates back many decades, as it was incorporated in such

classic transceivers as the FT-101, the FT-901 series, 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.

INTERFERENCE REJECTION

μ-TUNE FILTER

(

REQUIRES THE OPTIONAL RF μTUNING KIT

)

Changing the Tuning Offset Indicator

1. Press the

[

]

button to engage the Menu

mode.

2. Rotate the

[

SELECT

]

knob to select Menu item

“

006 DISP BARSEL006 DISP BARSEL

006 DISP BARSEL”.

ADVICE:

Press the

[

SELECT

]

knob to toggle the Menu item

display between “

006 DISP006 DISP

006 DISP” and “

BARSELBARSEL

BARSEL”.

3. Rotate the

[

CLAR/VFO-B

]

knob to select “

u-tnu-tn

u-tn

(μ-Tune)” (replacing the default “

C-tnC-tn

C-tn (CW TUN-

ING)” selection).

4. Press and hold in the

[

]

button for one sec-

ond to lock in the new setting and exit to normal

operation.

[

CLAR/VFO-B

]

Knob

[

]

Button

[

SELECT

]

Knob