Radio Direction Finder

A radio direction finder (RDF) is a device for finding the direction to a radio source. Due to low frequency propagation characteristic to travel very long distances and "over the horizon", it makes a particularly good navigation system for ships, small boats, and aircraft that might be some distance from their destination (see Radio navigation). The distinct technology Range and Direction Finding was the abbreviation used to describe the predecessor to radar.

Read more about Radio Direction Finder:  History, Operation, Usage in Maritime and Aircraft Navigation, Automatic Direction Finder (ADF)

Famous quotes containing the words radio and/or direction:

    Denouement to denouement, he took a personal pride in the
    certain, certain way he lived his own, private life,
    but nevertheless, they shut off his gas; nevertheless,
    the bank foreclosed; nevertheless, the landlord called;
    nevertheless, the radio broke,

    And twelve o’clock arrived just once too often,
    Kenneth Fearing (1902–1961)

    It is wonderful how well watered this country is.... Generally, you may go any direction in a canoe, by making frequent but not very long portages.
    Henry David Thoreau (1817–1862)