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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
Outer Marker
Middle Marker
Inner Marker
Figure 5-16 ILS Marker Beacon Softkeys
- Sets a Carrier Frequency by selecting an Index from 1 to 33.
(Default: Index is 17 and corresponds to 75.000 MHz)
- Sets the selected Marker Beacon, different from nominal:
Inner=3000 Hz, Middle=1300 Hz, Outer=400 Hz
(Range: 0 Hz to 10 MHz)
- Sets the amplitude modulation depth
on the Marker Beacon Carrier.
(Range: 0 to 99%)
When testing an ILS [Instrument Landing System], the following ILS Marker Beacon parameters
can be set:
Keysight CXG, EXG, and MXG X-Series Signal Generators User's Guide
Code
Color
_ _ _
Blue
._._._
Amber
. . . .
White
Avionics VOR/ILS (Option N5180302B)
Using ILS Marker Beacon Softkeys
Sound
400 Hz
two dashes per second
1300 Hz
alternating dot and dash
3000 Hz
dots only
- Turns off all
Marker Beacon signals
- Turns on and simulates
the Inner Marker Beacon
(3000 Hz modulation)
- Turns on and simulates
the Middle Marker Beacon
(1300 Hz modulation)
- Turns on and simulates
the Outer Marker Beacon
(400 Hz modulation)
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