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SPHERICAL WAVEFRONTS

Waves of energy that spread out in concentric circles [18].

SPIN VECTOR

In a gyro, a vector representing the angular velocity of the gyro rotor. The spin vector lies along the spin axis of the rotor [15].


SPLATTER

Unwanted sideband frequencies that are generated from overmodulation [12].

SPLICE

A joint formed by the connecting of two or more conductors [4].

SPORADIC E LAYER

Irregular, cloud-like patches of unusually high ionization. Often forms at heights near the normal E layer [10].


SPREADER

Insulator used with transmission lines and antennas to keep the parallel wires separated [10].

SPROCKET TUNER

A mechanical tuning device for magnetron tubes that changes the frequency of the cavities by changing the inductance. Also called a CROWN-OF-THORNS TUNER [11].


SQUARE MIL

The area of a square, the sides of which are each equal to 1 mil. One square mil is equal to 1.2732 circular mils [4].


SQUELCH

A circuit that cuts off the output of a receiver when there is no input [17].

SQUIRREL-CAGE WINDINGS

A type of rotor winding in which heavy conductors are imbedded in the
rotor body. The conductors are shorted together at the ends by continuous rings. It is widely applied in ac induction motors. Physically, it appears as a rotating squirrel-cage, thus the name [5].



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