Yaesu FT DX 3000 Operating Manual

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Contents

Page 56 FT DX 3000 O peraTing 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 Notch fil-ter. The LED inside the [NOTCH] button glows or-ange and the current “null” position of the NOTCHfilter will appear in the NOTCH indicator on thedisplay. The [NOTCH] knob functions as the Notchadjustment knob.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 IF NOTCH Filter selection will be memorizedindependently on each VFO stack of VFO-A andVFO-B.[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 BANDWIDTHNOTCHwidtH iNdicAtoR