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A logic function of A and B that is true if either A or B is false .
A combination of a NOT function and an AND function in a binary circuit that has two or more inputs and one output. The output is logic 0 only if ALL inputs are logic 1; it is logic 1 if ANY input is logic 0 .
See RESONANT FREQUENCY .
The line-of-sight horizon .
The length of a minute of arc of a great circle of the earth (6,076 ft) .
NAUTICAL RADAR MILE
See RADAR MILE .
NEAR SYNCHRONOUS ORBIT
An orbit in which the satellite rotates close to but not exactly at the same speed as the earth .
The process of inverting the value of a function or variable .
That part of a sine wave that is below the reference level   .
A circuit that clamps the upper extremity of the output waveshape to a dc
potential of 0 volts .