A logic function of A and B that is true if either A or B is false [13].
NAND CIRCUIT
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 [13].
NATURAL FREQUENCY
See RESONANT FREQUENCY [9].
NATURAL HORIZON
The line-of-sight horizon [10].
NAUTICAL MILE
The length of a minute of arc of a great circle of the earth (6,076 ft) [18].
NAUTICAL RADAR MILE
See RADAR MILE [18].
NEAR SYNCHRONOUS ORBIT
An orbit in which the satellite rotates close to but not exactly at the same speed as the earth [17].
NEGATION
The process of inverting the value of a function or variable [13].
NEGATIVE ALTERNATION
That part of a sine wave that is below the reference level [2] [10] [12].
NEGATIVE CLAMPER
A circuit that clamps the upper extremity of the output waveshape to a dc potential of 0 volts [9].