Yaesu FT-450D Operation Manual

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Page 29FT-450D OPERATION MANUALSHIFT (I NTERFERENCE R EJECTION “S IGNALS WITHIN 3 KHZ ”)IF Shift allows you to vary the DSP filter passband higher or lower, without changing the pitch of the incomingsignal, so as to reduce or eliminate interference. Because the carrier tuning frequency is not varied, there is noneed to re-tune the operating frequency when eliminating the interference. The total passband tuning range forthe IF Shift system is ±1 kHz.CONVENIENCE F EATURESRotate the [SHIFT] knob to the left or right to reducethe interference.You may observe the position of the passband in the“SHIFT” indicator of the DSP Graphic Display on thedisplay.“SHIFT” Indicator[SHIFT] knob[SHIFT] KNOB FULLY COUNTER-CLOCKWISE[SHIFT] KNOB 12 O’CLOCK POSITION[SHIFT] KNOB FULLY CLOCKWISEReferring to Figure “A”, note the depiction ofthe IF DSP filter as the thick line, with the[SHIFT] knob in the 12 o’clock position. InFigure “B”, an interfering signal has appearedinside the original passband. In Figure “C”,you can see the effect of rotating the [SHIFT]knob to reduce the interference level by mov-ing the filter passband so that the interfer-ence is outside of the passband.A B CIFBANDWIDTHIFBANDWIDTHIFBANDWIDTHDesired Signal Desired Signal Desired SignalQRMQRM