390 Keysight EXG and MXG X-Series Signal Generators User’s Guide
Using Avionics VOR/ILS Softkeys for N5171B/72B and N5181B/82B with Option 302
Using ILS Marker Beacon Softkeys
Using ILS Marker Beacon Softkeys
An ILS [Instrument Landing System] is a navigation system, used by aircraft to
obtain guidance to a runway (performing a “runway approach”) and includes
the following three functions operating in tandem (working together):
— ILS Localizer - ensures that the lateral/horizontal left-right approach of an
aircraft is aligned with the center of a runway
— ILS Glide Slope - ensures that the vertical descent path of an aircraft is
aligned to the proper descent path (~ 3 degrees downwards slope) of a
runway
— ILS Marker Beacons - ensures the proper distance from a runway; the
distances are based on the Outer, Middle, and Inner ILS Marker Beacons
Marker Beacons are used to alert a pilot that an action is needed, such as
checking the aircraft altitude. Marker Beacon information is presented to pilots
by audio and visual information. The ILS Localizer may contain present
information on the Outer, Middle, and Inner ILS Marker Beacons. All ILS Marker
Beacons are broadcast at 75 MHz and are located at specific intervals along an
ILS approach. Each ILS Marker Beacon is identified by specific audio as well as
visual characteristics.
ILS Marker
Beacon
Code Color Sound
Outer Marker _ _ _ Blue 400 Hz
two dashes per second
Middle Marker ._._._ Amber 1300 Hz
alternating dot and dash
Inner Marker . . . . White 3000 Hz
dots only
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