Electronics (Mike Jaroch)
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SUBSTRATEMounting surface for integrated circuits. May be semiconductor or insulator material depending on type of IC [14]. | ||
SUDDEN IONOSPHERIC DISTURBANCEAn irregular ionospheric disturbance that can totally blank out hf radio communications [10]. | ||
SUMMING NETWORKA 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 [15]. | ||
SUPERHETERODYNE RECEIVERA type of receiver that uses a mixer to convert the RF echo to an IF signal for amplification [18]. | ||
SUPERHIGH FREQUENCYThe band of frequencies from 3 gigahertz to 30 gigahertz [17]. | ||
SUPERSONIC(1) Speed greater than the speed of sound [10]. (2) Ultrasonic. | ||
SUPPORT SYSTEMFor a radar, a system that provides an auxiliary input, such as dry air, electrical power, or liquid cooling [18]. | ||
SUPPRESSIONThe process of eliminating an undesired portion of a signal [17]. | ||
SURFACE WAVERadio waves that travel along the contours of the earth, thereby being highly attenuated [10]. | ||
SWAMPING RESISTORA resistor used to increase or "broaden" the bandwidth of a circuit [8]. | ||