## Electronics (Mike Jaroch)

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### R

#### RETENTIVITY

The ability of a material to retain its magnetism [1].
 Keyword(s): RETENTIVITY

#### RETURN

The RF signal reflected back from a radar target; echo [18].
 Keyword(s): RETURN

#### REVERBERATION

The multiple reflections of sound waves [10].
 Keyword(s): REVERBERATION

#### REVERSE AGC

The type of AGC that causes an amplifier to be driven toward cut-off [17].
 Keyword(s): REVERSE AGC

#### REVERSE BIAS

An external voltage applied to a diode or semiconductor junction to reduce the flow of electrons across the junction. Also called BACK BIAS [7] [13].

 Keyword(s): REVERSE BIAS

#### RF AMPLIFIER

RF (RADIO FREQUENCY) AMPLIFIER—An amplifier designed to amplify signals with frequencies between 10 kilohertz (10 kHz) and 100,000 megahertz (100,000 MHz) [8].

 Keyword(s): RF AMPLIFIER

A health hazard caused by exposure to electromagnetic radiation or high-
energy particles (ions). Abbreviated RADHAZ [18].

#### RF TRANSFORMER

RF (RADIO FREQUENCY) TRANSFORMER—A transformer specially designed for use with RF (radio frequencies). An RF transformer is wound onto a tube of nonmagnetic material and has a core of either powdered iron or air [8].

 Keyword(s): RF TRANSFORMER

#### RGK

The symbol used to express the resistance between the grid and the cathode of an electron tube [6].
 Keyword(s): RGK

#### RHEOSTAT

A variable resistor used for the purpose of adjusting the current in a circuit [1] [4].
 Keyword(s): RHEOSTAT

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