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A
To make both the ILS-localizer- and glide path receiver less susceptible to interference from commercial FM-stations (radio and television).
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B
To make the ILS localizer receiver less susceptible to interference from earth-reflected localizer-signals.
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C
To make the ILS-localizer receiver less susceptible to interference from commercial FM-stations (radio and television).
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D
To make both the ILS-localizer- and glide path receiver less susceptible to interference from earth-reflected localizer-signals.
This is old syllabus only - the learning objective that related to this (062.02.05.05.03: Describe the effect of FM broadcast stations that transmit on frequencies just below 108 MHz) was removed for the 2020 syllabus.
FM broadcasting stations in "band 2" can broadcast up to frequencies just below 108 MHz, which is the bottom end of VHF NAV frequency band. This could cause interference for VOR or ILS localiser frequencies, if there is a strong enough FM station producing radio waves at that very close frequency nearby. In reality, this is so incredibly rare, but the aviation industry have protected against it anyway by creating "FM immunity filters" which block these radio waves from affecting the aircraft's antennae.
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This question has appeared on the real examination, you can find the related countries below.
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Austro Control4
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Poland3
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Pakistan2
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Ireland1
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Norway1
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