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The ability of a material to retain its magnetism .
The RF signal reflected back from a radar target; echo .
The multiple reflections of sound waves .
The type of AGC that causes an amplifier to be driven toward cut-off .
An external voltage applied to a diode or semiconductor junction to reduce the flow of electrons across the junction. Also called BACK BIAS  .
RF (RADIO FREQUENCY) AMPLIFIER—An amplifier designed to amplify signals with frequencies between 10 kilohertz (10 kHz) and 100,000 megahertz (100,000 MHz) .
RF RADIATION HAZARD
A health hazard caused by exposure to electromagnetic radiation or high-
energy particles (ions). Abbreviated RADHAZ .
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 .
The symbol used to express the resistance between the grid and the cathode of an electron tube .
A variable resistor used for the purpose of adjusting the current in a circuit  .