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R

RETENTIVITY

The ability of a material to retain its magnetism [1].

RETURN

The RF signal reflected back from a radar target; echo [18].

REVERBERATION

The multiple reflections of sound waves [10].

REVERSE AGC

The type of AGC that causes an amplifier to be driven toward cut-off [17].

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].


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].


RF RADIATION HAZARD

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].


RGK

The symbol used to express the resistance between the grid and the cathode of an electron tube [6].

RHEOSTAT

A variable resistor used for the purpose of adjusting the current in a circuit [1] [4].


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