Att (Attenuator); Dsp Noise Reduction (Dnr) - Yaesu FT-891 Operating Manual

Advanced Operation

ATT (Attenuator)

The Attenuator will reduce all signals (and noise) by 10 dB, and it may be used to make
reception more pleasant under extremely noisy conditions.
1. Rotate the MULTI knob, as needed, until
Multi Function Row "F-03 [ ATT ] [ IPO ] [ NAR ] "
appears on the display.
2. Press the [ A ]( ATT ) key. The "ATT" indicator
will appear in the display.
3. To restore full signal strength through the Attenuator circuit, press the [ A ]( ATT ) key to
return the ATT display to the "OFF" position.

DSP Noise Reduction (DNR)

The Noise Reduction feature of the DSP system may be used to enhance signal-to-noise
ratio on weak signals.
1. Rotate the MULTI knob, as needed, un-
til Multi Function Row "F-06 [ DNR ] [ MOX ]
[ CONT ] ".
2. Press the [ A ]( DNR ) key to activate the DSP
Noise Reduction feature.
3. Rotate the MULTI knob to find the point where best signal-to-noise ratio is obtained
under the current noise conditions.
4. Press the [ F ] key to save the new setting and exit to normal operation.
5. To turn off the DSP Noise Reduction feature, press the [ A ]( DNR ) key again.
6. If noise is present at a level which causes indication on the S-meter, the performance
of the Noise Reduction filter may be enhanced by rotating the SQL/RF (RF Gain) con-
trol in a counter-clockwise direction so as to set the (fixed) S-meter reading at the same
level as the noise peaks. This adjustment raises the AGC threshold of the receiver.
20
Application for FCC / IC
FCC ID: K6620651X50 / IC: 511B-20651X50
FT-891 Operating Manual