Yaesu FT dx 1200 Operating Manual

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Page 56FT D X 1200 O PERA T ING M ANUALinterference rejectioniF notch Filter operAtion (SSb/cw/rtty/dAtA/AM ModeS)The IF NOTCH filter is a highly effective system that allows you to slice out an interfering beat note or other carriersignal from inside the receiver passband.1. Press the [NOTCH] button to activate the Notchfilter. The DSP graphic display will illuminate andthe current “null” position of the NOTCH filter willappear in the NOTCH indicator on the display. The[NOTCH] knob functions as the Notch adjustmentknob.2. Rotate the [NOTCH] knob to adjust the “null” posi-tion of the Notch filter.A dvice :The frequency display will show the Notch frequen-cy for 3 seconds whenever the [NOTCH] knob isturned.3. To cancel the NOTCH filter, press the [NOTCH]button momentarily. The graphic disappears from theNOTCH indicator on the display, confirming that theNOTCH filter is no longer in operation.A dvice :Alternate presses of the [NOTCH] button, willswitch the NOTCH filter between on and off.A dvice : The bandwidth of the NOTCH filter (either narrowor wide) may be adjusted using Menu item “ 111IF NOTCH WIDTH”. The factory default setting is“WIDE”.[NOTCH] ButtonThe performance of the IF NOTCH filter is illus-trated in Figure “A”, where the effect of rotationof the [NOTCH] knob is depicted. In Figure “B”you can see the notching effect of the IF NOTCHfilter as you rotate the [NOTCH] knob to elimi-nate the interfering heterodyne.A BDesired Signal Desired SignalQRM(Heterodyne)QRM(Heterodyne)IF BANDWIDTH IF BANDWIDTHNOTCHnotch indicAtor