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S

SYNCHRONOUS

A type of teletypewriter operation where both transmitter and receiver operate
continuously [17].


SYNCHRONOUS MOTOR

An ac motor whose rotor is activated by dc. It is characterized by constant
speed and requires squirrel-cage windings or some other method to be self-starting [5].


SYNCHRONOUS ORBIT

An orbit in which the satellite moves or rotates at the same speed as the earth
[17].


SYNCHRONOUS SPEED

The speed at which the rotating field in an ac motor revolves. This speed is a
function of the number of poles in the field and the frequency of the applied voltage [5].


SYNCHRONOUS TUNING

In a klystron amplifier, a method of tuning that tunes all the resonant
cavities to the same frequency. High gain is achieved, but the bandwidth is narrow [11].


SYSTEM

A combination of sets, units, assemblies, subassemblies, and parts joined together to form a specific operational function or several functions [17].



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