Yaesu FT-991 Operating Manual
Also see for FT-991: ManualManualOperating manualReference bookInstruction manual
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Contents
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Page 53FT-991 O PERA T I N G M A N U A LiF notch Filter operAtion (SSb/cW/rtty/dAtA/AM ModeS)The IF NOTCH filter is a highly effective system that allows cutting out an interfering beat note or other carrier signalfrom inside the receiver passband.1. Press the F(MLIST) button to show the functionslisted on the TFT display.2. Touch [NOTCH] on the TFT display. The Notchfunction will be set to “ON”.MULTI KnobF(M-LIST) ButtonNOTCH indicatorNOTCH level indicator3. Rotate the MULTI knob to adjust the “null” positionof the Notch filter.4. To cancel the NOTCH filter, touch [NOTCH] on theTFT display, “OFF” will appear in the display, con-firming that the NOTCH filter is no longer in opera-tion.A dvice :Alternate touches of [NOTCH], will switch theNOTCH filter between on and off.A dvice : The bandwidth of the NOTCH filter (either narrowor wide) may be adjusted using Menu item “116IF NOTCH WIDTH”. The factory default setting is“WIDE”.The performance of the IF NOTCH filter is illus-trated in Figure “A”, where the desired signal andthe interfering heterodyne are shown within theIF passband. In Figure “B” the notching effect ofthe IF NOTCH filter is illustrated as the MULTIknob is rotated to eliminate the interfering het-erodyne.A BDesired Signal Desired SignalQRM(Heterodyne)QRM(Heterodyne)IF BANDWIDTH IF BANDWIDTHMULTIinterference reJection |
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