The ILS localizer operates in which frequency band?

The ILS (Instrument Landing System) localizer operates in the frequency band of 108.0 - 112.0 MHz. This frequency range is specifically designated for precision approach guidance and is used to provide lateral guidance to aircraft approaching a runway. The localizer works by transmitting a directional signal that helps pilots align their aircraft with the runway centerline for safe landings, particularly in low visibility conditions.

This frequency choice is important for ensuring that the localizer signals can be accurately received by aircraft instrumentation, allowing pilots to rely on precise guidance as they approach the runway. Frequencies outside this band are designated for other aviation uses, such as VOR (VHF Omnidirectional Range) navigation aids and other types of communication and navigation services, which do not serve the same purpose as the ILS localizer.