## Electronics (Mike Jaroch)

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### R

#### REFRACTION

The changing of direction of a wave as it leaves one medium and enters another medium of a different density [10] [18].

 Keyword(s): REFRACTION

#### REFRACTIVE INDEX

In a wave-transmission medium, the ratio between the phase velocity in free
space and in the medium [11] [18].

 Keyword(s): REFRACTIVE INDEX

#### REGENERATION

See FEEDBACK [18].
 Keyword(s): REGENERATION

#### REGENERATIVE DETECTOR

A detector circuit that produces its own oscillations, heterodynes them
with an incoming signal, and deflects them [12].

 Keyword(s): REGENERATIVE DETECTOR

#### REGENERATIVE FEEDBACK

The process by which a portion of the output signal of an amplifying
device is fed back in phase to reinforce the input. Also called POSITIVE FEEDBACK [8] [9].

 Keyword(s): REGENERATIVE FEEDBACK

#### REGULATOR

The section in a basic power supply that maintains the output of the power supply at a constant level in spite of large changes in load current or input line voltage [6] [7].

 Keyword(s): REGULATOR

#### RELATIVE BEARING

Bearing of a target measured in a clockwise direction from "dead ahead" of a
ship or plane [18].

 Keyword(s): RELATIVE BEARING

#### RELAY

An electromagnetic device with one or more sets of contacts that change position by the magnetic attraction of a coil to an armature [3].

 Keyword(s): RELAY

#### RELUCTANCE

A measure of the opposition that a material offers to magnetic lines of force [1].
 Keyword(s): RELUCTANCE

#### REMOTE-CUTOFF TUBE

An electron tube in which the control grid wires are farther apart at the
centers than at the ends. This arrangement allows the tube to amplify large signals without being driven into cutoff. This tube is also called a VARIABLE-MU TUBE [6].

 Keyword(s): REMOTE-CUTOFF TUBE

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