Yaesu FT-891 Operating Manual

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20Advanced OperationFT-891 Operating ManualATT (Attenuator)The Attenuator will reduce all signals (and noise) by 10 dB, and it may be used to makereception more pleasant under extremely noisy conditions.1. Rotate the MULTI knob, as needed, untilMulti Function Row “F-03 [ATT] [IPO] [NAR]”appears on the display.2. Press the [A](ATT) key. The “ATT” indicatorwill appear in the display.3. To restore full signal strength through the Attenuator circuit, press the [A](ATT) key toreturn 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-noiseratio 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 DSPNoise Reduction feature.3. Rotate the MULTI knob to find the point where best signal-to-noise ratio is obtainedunder 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 performanceof 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 samelevel as the noise peaks. This adjustment raises the AGC threshold of the receiver.