The following component(s) of the ILS is/are protected from interference by the "FM-Immunity filters" in the navigation receiver equipment:
Frequency Modulation (FM) broadcasting service interference on Instrument System (ILS) Localizer, VHF Omnidirectional Radio Range (VOR) communications equipment is widely recongnized problem among users of aviation facilities. The FM broadcasting service operates in the 88-108 MHz band has caused interference problens in the adjacent VHF aeronautical service band 108-136 MHz. Consequently, for safety reasons, VOR and ILS localizer receivers in aircraft are now required to be protected against potential interference from VHF broadcast transmissions. This entails the use of FM (Frequency Modulation) immune VHF equipment, FM-Immunity filters. In airborne ILS localizer and VOR receivers, the interference problems range from nuisance background FM broadcasting audit to errors in course deviation and flag operation.
- The ILS Glideslope operates in the UHF frequency band and not VHF, therefore there is no need to protect it from intereference. Only the Localizer is protected by FM-Immunity Filters.
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Austro Control2
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