A tracking transmitter broadcasts a radio signal which can be detected by a

directional antenna A directional antenna or beam antenna is an antenna which radiates or receives greater power in specific directions allowing increased performance and reduced interference from unwanted sources. Directional antennas provide increased performance ...

(typically a

Radio Direction Finder Direction finding (DF), or radio direction finding (RDF), isin accordance with International Telecommunication Union (ITU)defined as radio location that uses the reception of radio waves to determine the direction in which a radio station ...

.) By rotating the antenna one can determine the direction the signal lies in and of course whatever it may be attached to. The EPIRB is an example of a similar device. It is commonly used in model rocketry and remote control aircraft to locate lost equipment.

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1.5 volt example transmitter
Wireless transmitters

See also

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