Avionic Standards
R&S
®
SMA100B
115User Manual 1178.3834.02 ─ 05
Figure 5-2: Marker beacon placement and distance to runway
Marker beacon receivers decode audio and provide signaling output to identify one of
three marker beacons installed near the runway. They transmit a narrow beam width at
75 MHz carrier frequency in a vertical direction. Each of them has a different distinct
modulation code to allow the receiver to identify which one it is flying over [1MA193].
Both visual (color of the marker beacon) and audio tone identification is supported for
determining which marker has been flown over. The audio/visual pairing of marker bea-
cons is as follows:
●
Outer marker flashes BLUE in the cockpit at 400 Hz (“relaxed” tone).
●
Middle marker flashes AMBER in the cockpit at 1300 Hz (“hurried” tone).
●
Inner marker flashes WHITE in the cockpit at 3000 Hz (“urgent” tone).
Related Settings
For ILS settings at the R&S SMA100B, see the following sections:
●
Chapter 5.4.2, "ILS Glide Slope Settings", on page 127
●
Chapter 5.4.3, "ILS Localizer Settings", on page 134
●
Chapter 5.4.4, "ILS Marker Beacons Settings", on page 143
5.2.3 Automatic Direction Finder (ADF)
ADF receivers provide the relative bearing of a basic ground-based Non-Directional
Beacon (NDB) to the fore/aft axis of the aircraft. The beacon signal is generated by a
directional antenna assembly in the aircraft.
The ADF determines the direction to the NDB station relative to the aircraft and is used
for instrument approaches (autopilot). It provides additional information to other naviga-
tion equipment, e.g. VOR.
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