Electronics (Mike Jaroch)
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A constant fixed potential applied between the grid and the cathode of a vacuum tube to establish an operating point .
The current that flows in the grid-to-cathode circuit of a vacuum tube .
A method of changing the center frequency of a resonant cavity by physically
changing the distance between the cavity grids .
A self-bias provided by a high resistance connected across the grid capacitor or
between the grid and cathode 
(1) The point in a circuit used as a common reference point for measuring purposes. (2) To connect some point of an electrical circuit or some item of electrical equipment to earth or to the conducting medium used in lieu thereof .
Unwanted echoes, from surrounding land masses, that appear on a radar indicator .
The portion of a ground-plane antenna that acts as ground .
Copper planes used to minimize interference between circuits and from external sources .
Zero potential with respect to the ground or earth .
The distance on the surface of the earth between a radar and its target. Equal to slant range only if both radar and target are at the same altitude .