Marker Beacon Modulation
Option R&S SMA-K25 enables the marker beacon modulation on the R&S SMA (requires frequency option R&S SMA-B10x).
The marker beacon signal is output at the LF OUT connector at the front of the instrument.
ILS systems provide information relating to the position of the air plane relative to the runway during landing. The markers indicate the distance of the air plane relative to the threshold of the runway. The modulation frequency changes from outer to the inner marker which are located at a defined distance from the runway. The altitude of the air plane must be 200 feet by the time the middle marker with a modulation frequency of 1300 Hz is reached.
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