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    https://en.wikipedia.org › wiki › Direction_finding

    Direction finding - Wikipedia

    • A radio direction finder (RDF) is a device for finding the direction, or bearing, to a radio source. The act of measuring the direction is known as radio direction finding or sometimes simply direction finding (DF). Using two or more measurements from different locations, the location of an unknown transmitter can be determined; alternately, using two or more me… 展开

    Overview

    Direction finding (DF), or radio direction finding (RDF), is the use of radio waves to determine the direction to a radio source. The source may be a cooperating radio transmitter or may be an inadvertant source, a naturally-occur… 展开

    History

    The earliest experiments in RDF were carried out in 1888 when Heinrich Hertz discovered the directionality of an open loop of wire used as an antenna. When the antenna was aligned so it pointed at the signal it produce… 展开

    Radio Direction Finder (RDF) - Doppler Systems, LLC
    Established in 1981, Doppler Systems designs and manufactures fixed site and mobile radio direction finders and radio direction finding (RDF) systems. We provide RDF equipment and software for government, commercial, and amateur users. Because of our outstanding reputation, clients worldwide use our direction finders in many ways.
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