Manual Notch Filter And Auto Notch Filter - Kenwood TS-590SG Manual

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4.3.3 Manual Notch Filter and Auto Notch Filter

The manual notch filter is a notch filter with a frequency that can be shifted with the notch knob. The auto notch filter is a
notch filter that automatically tracks a beat frequency with an adaptive filter technique. Both notch filters have the attenuation
of more than 60 dB at the center frequency. Figure 4-8 describes how a weak signal emerges by the operation of AGC
when the manual notch filter eliminates an interfering signal in the power spectrum.
Figure 4-8 Interference Elimination by Manual Notch Filter (OFF→ON) and Emergence of Weak Signals
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