6.2. AIM+: USING THE SPECTRUM ANALYSER TO
DETECT AND MITIGATE INTERFERENCE
6.2.1 Narrowband interference mitigation
Configuring the notch filters
In the default auto mode of the notch filters, the receiver performs automatic interference
mitigation of the region of the spectrum affected by interference. In manual mode as shown
configured for Notch1 in Figure 6-3, the region of the affected spectrum is specified by a
centre frequency and a bandwidth which is effectively blanked by the notch filter.
Figure 6-3: Configuring the first notch filter Notch1 at 1235 MHz
With the Notch1 settings as shown in Figure 6-3, the L2-band after the notch filter (After IM)
is shown in Figure 6-4 with the blanked section clearly visible.
Figure 6-4: The RF spectrum of the L2 Band after applying the notch filter at
1235 MHz
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