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Previous set of "S" terms and definitions.
STEPPER MOTOR. A motor that operates in discrete angular motions of uniform magnitude. [Stepper Motor Manufacturers]
STEP-TRANSMISSION SYSTEM. A data transmission system that operates on direct current. It consists
of a step transmitter (rotary switch) and a step motor interconnected to transmit data (information)
between remote locations.
STICKOFF VOLTAGE. A low voltage used in multi-speed synchro-systems to prevent false synchronizations.
STORAGE TEMPERATURE. The minimum or maximum temperature a device may be safely stored while not in use. Storage temperature is normally higher or lower than a devices operating temperature range.
STRANDED CONDUCTOR. A conductor composed of a group of wires. The wires in a stranded
conductor are usually twisted together and not insulated from each other.
STRANDS. Fine metallic filaments twisted together to form a single wire.
STRATOSPHERE. Located between the troposphere and the ionosphere; it has little effect on radio
waves.
STROBOSCOPE. An instrument that allows viewing of rotating or reciprocating objects by producing the
optical effect of a slowing down or stopping motion.
STUB. Short section of a transmission line used to match the impedance of a transmission line to an antenna. Can also be used to produce desired phase relationships between connected elements of an antenna.
SUBASSEMBLY. Consists of two or more parts that form a portion of an assembly or a unit.
SUBHARMONIC. An exact submultiple of the fundamental frequency. Even sub-harmonics are one-half,
one-quarter, and so on. Odd subharmonics are one-third, one-fifth, and so on of the fundamental
frequency.
SUBSTRATE. Mounting surface for integrated circuits. May be semiconductor or insulator material
depending on type of IC.
SUDDEN IONOSPHERIC DISTURBANCE. An irregular ionospheric disturbance that can totally blank
out hf radio communications.
SUMMING NETWORK. A combination of two or more parallel resistors used in servosystems as an
error detector. The output of the network is the algebraic sum of the inputs.
SUPERHETERODYNE RECEIVER. A type of receiver that uses a mixer to convert the RF echo to an
IF signal for amplification.
SUPERHIGH FREQUENCY. The band of frequencies from 3 gigahertz to 30 gigahertz.
SUPPRESSION. The process of eliminating an undesired portion of a signal.
SURFACE WAVE. Radio waves that travel along the contours of the earth, thereby being highly
attenuated.
SWITCH. A device used to connect, disconnect, or change the connections in an electrical circuit. A device used to open or close a circuit. [Switch Manufacturers]
SWITCH DEBOUNCE. Refer to Switch Debounce Definition
Next Set of "S" definition and terms
