DF
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df (direction finder)
apparatus for determining the source of a conveyed signal, radio signal receiver

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DF
DF or df may stand for:
In geography and politics:

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Delta Phi
Delta Phi (ΔΦ) is a fraternity founded in 1827 at Union College in Schenectady, New York. Founded as part of the Union Triad, along with the Kappa Alpha Society and Sigma Phi Society, Delta Phi was the third and last member of the Triad. The organization has never disbanded, making it the oldest continuously running social fraternity.

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DF (Distrito Federal)
Mexico City, capital city of Mexico (country in southern North America)

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DF (Distrito Federal)
Federal District

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Direction Finder (DF)
A radio receiver equipped with a directional sensing antenna used to take bearings on a radio transmitter. Specialized radio direction finders are used in aircraft as air navigation aids. Others are ground-based, primarily to obtain a "fix" on a pilot requesting orientation assistance or to locate downed aircraft. A location "fix" is established by the intersection of two or more bearing lines plotted on a navigational chart using either two separately located Direction Finders to obtain a fix on an aircraft or by a pilot plotting the bearing indications of his Direction Finder (DF) on two separately located ground-based transmitters both of which can be identified on his chart. (FAA4) (FAA8)

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