Electronics (Mike Jaroch)
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DOPPLER EFFECT(1) The apparent change in frequency or pitch when a sound source moves either toward or away from a listener [10]. (2) In radar, the change in frequency of a received signal caused by the relative motion between the radar and the target [18]. | ||
DOPPLER FREQUENCYThe difference between transmitted and reflected frequencies; caused by the Doppler effect [18]. | ||
DOUBLE NEGATIVE LAWIn Boolean algebra, the law which states that the complement of a complement is the equivalent of the original term [13]. | ||
DOUBLE RECEIVERA fine and coarse synchro receiver enclosed in a common housing with a two- shaft output (one shaft inside the other) [15]. | ||
DOUBLE-MODINGIn a transmitter output tube, the abrupt and random change from one frequency to another [18]. | ||
DOUBLETAnother name for the dipole antenna [10]. | ||
DOUBLING UPThis is a type of two-equipment installation where one unit can be substituted for another in the event of failure [17]. | ||
DOWN LINKThe frequency used to transmit an amplified signal from a satellite or other craft back to earth [17]. | ||
DRIFT SPACEIn an electron, a region free of external fields in which relative electron position depends on velocity [11]. | ||