FTDX1200 Operating Manual Page 53

INTERFERENCE REJECTION Cont'd
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IF SHIFT OPERATION (SSB/CW/RTTY/PKT MODES)
IF SHIFT allows you to move the DSP filter passband higher or lower, without changing the pitch of the incoming signal, and this reduces or elliminates interference. Because the carrier tuning freqency is not varied, there is no need to re-tune the operating frequency to elliminate the interference. The total passband tuning range for the IF SHIFT system is ±1 kHz.

  1. Rotate the [SHIFT] knob to the left or right to reduce the interference.

ADVICE:
The display will show the shift value of the IF SHIFT for 3 seconds whenever the [SHIFT] knob is turned.

Referring to Figure "A", note the depiction of the IF DSP filter as the thick line, with the [SHIFT] knob in the 12 o'clock position. In Figure "B", an interfering signal has appeared inside the original passband. In Figure "C", you can see the effect of rotating the [SHIFT] knob. The interference level is reduced by moving the filter passband so that the interference is outside of the passband.




End of "IF Shift Operation (SSB/CW/RTTY/PKT Modes) "

Cont'd Next Page "Interference Rejection"
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FTDX1200 Operating Manual Page 53