Electronics (Mike Jaroch)


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D

DOPING

The process of adding impurities to semiconductor crystals to increase the number of free charges that can be moved by an external, applied voltage. Doping produces N-type or P-type material [7] [14].


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 FREQUENCY

The difference between transmitted and reflected frequencies; caused by the
Doppler effect [18].


DOUBLE NEGATIVE LAW

In Boolean algebra, the law which states that the complement of a
complement is the equivalent of the original term [13].


DOUBLE RECEIVER

A fine and coarse synchro receiver enclosed in a common housing with a two-
shaft output (one shaft inside the other) [15].


DOUBLE-MODING

In a transmitter output tube, the abrupt and random change from one frequency to another [18].


DOUBLET

Another name for the dipole antenna [10].

DOUBLING UP

This is a type of two-equipment installation where one unit can be substituted for another in the event of failure [17].


DOWN LINK

The frequency used to transmit an amplified signal from a satellite or other craft back to earth [17].


DRIFT SPACE

In an electron, a region free of external fields in which relative electron position depends on velocity [11].



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