## 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].

 Keyword(s): DOPING

#### 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].

 Keyword(s): DOPPLER EFFECT

#### DOPPLER FREQUENCY

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

 Keyword(s): DOPPLER FREQUENCY

#### DOUBLE NEGATIVE LAW

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

 Keyword(s): DOUBLE NEGATIVE LAW

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].

 Keyword(s): DOUBLE-MODING

#### DOUBLET

Another name for the dipole antenna [10].
 Keyword(s): DOUBLET

#### DOUBLING UP

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

 Keyword(s): DOUBLING UP

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