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S

SINGLE, STATIONARY-LOBE SCANNING SYSTEM

Antenna (with a single, stationary beam) that is rotated to obtain 360-degree coverage [18].


SINGLE-ENDED MIXER

See UNBALANCED CRYSTAL MIXER [18].

SINK

See OUTPUT END [10].

SKIP DISTANCE

The distance from a transmitter to the point where the sky wave is first returned to earth [10].


SKIP ZONE

A zone of silence between the point where the ground wave becomes too weak for reception and the sky wave is first returned to earth [10].


SKY WAVES

Radio waves reflected back to earth from the ionosphere [10].

SLANT RANGE

See RANGE [18].

SLIP

The difference between rotor speed and synchronous speed in an ac induction motor [5].

SLIP RINGS

Contacts that are mounted on the shaft of a motor or generator to which the rotor windings are connected and against which the brushes ride [5]. Devices for making electric connections between stationary and rotating contacts.


SLOPE DETECTOR

A tank circuit tuned to a frequency, either slightly above or below an FM carrier frequency, that is used to detect intelligence [12].



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