What is the operational frequency of marker beacons?

The operational frequency of marker beacons is 75 MHz. Marker beacons are used in conjunction with the Instrument Landing System (ILS) and provide specific location information to pilots flying an approach. They typically indicate when the aircraft is at certain points in the approach, such as the outer marker, middle marker, and inner marker, each of which communicates with pilots through audio signals.

When working with these beacons, it is essential for pilots to be familiar with their operational frequencies in order to accurately utilize the information they provide. The specific frequency of 75 MHz is allotted for marker beacons, distinguishing them from other types of navigational aids which operate at different frequencies. For example, VOR stations typically operate in the range of 108 MHz to 117.975 MHz, and other frequencies mentioned in the options do not correspond to the marker beacon frequency standard defined by aviation regulations.