ADF modulation (Automatic Direction Finders) is available for the basic unit (R&S SMA + frequency option R&S SMA-B10x) equipped with option R&S SMA-K25.
The ADF signal is output at the LF OUT connector at the front of the instrument.
The ADF modulation provides a predefined test signal for ADF systems (Automatic Direction Finder).
ADF receivers provide the relative bearing of a basic ground based Non Directional Beacon (NDB) to the fore/aft axis of the aircraft by using 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 navigation equipment, e.g. VOR.
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