"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
"S" to "Sec",
"Sel" to "Series pa",
"Series pe" to "Sho",
"Shu" to "Skip",
"Sky" to "Spe",
"Spi" to "Sta",
"Ste" to "Sym",
"Syn" to "Sz"
SATELLITE ECLIPSE. An eclipse where the rays of the sun do not reach the satellite. This prevents
recharging of the solar cells of the satellite and decreases the power to the transmitter.
SATELLITE-SUN CONJUNCTION. A period when the satellite and sun are close together and the noise
from the sun prevents or hampers communications.
SATURABLE-CORE REACTOR. A coil in which the reactance is controlled by changing the
permeability of the core.
SATURATION. The condition existing in any circuit in which an increase in the input signal produces
no further change in the output. The operating point of a vacuum tube or transistor at which a
further increase in grid or base current no longer produces an increase in plate or collector current. In a magnetic core, the condition in which a magnetic material has reached a maximum flux
density and the permeability has decreased to a value of approximately 1.
SCALING FACTOR. The term used to describe the use of unequal resistors in a servo’s summing
network to compensate for differences between input and output signal levels.
SCATTER ANGLE. The angle at which the receiving antenna must be aimed to capture the scattered
energy of tropospheric scatter.
SCHEMATIC. A diagram which shows, by means of graphic symbols, the electrical connections and
functions of a specific circuit arrangement. Schematic Tools
SCHEMATIC SYMBOLS. A letter, abbreviation, or design used to represent specific characteristics or
components on a schematic diagram.
SCHOTTKY DIODE. A junction diode with the device junction formed between the semiconductor and a metal contact rather than between dissimilar semiconductor materials. Diode Manufacturers
SCINTILLATION. Apparent change in target reflectivity. Motion of the target causes successive radar
pulses to bounce off different parts of the target, such as fuselage and wingtip.
SCREEN GRID. A grid placed between a control grid and the plate and usually maintained at a fixed
positive potential.
SCREENING. Process of applying nonconductive or semiconductive materials to a substrate to form thick
film components.
SEARCH RADAR SYSTEM. An early-warning device that searches a fixed volume of space. Radar terms, and definitions
SECONDARY. The output coil of a transformer.
SECONDARY CELL. A cell that can be recharged by a current being passed through the cell in a
direction opposite to the discharge current. Battery Manufacturers
SECONDARY EMISSION. The liberation of electrons from an element, other than the cathode, as a
result of being struck by other high-velocity electrons.
SECONDARY LOOP. In a cooling system, the loop that transfers the heat from the heat source, such as
electronic equipment, to the primary loop; usually distilled water.
SECOND DETECTOR (DEMODULATOR). The part of the receiver that separates the audio or video
component from the modulated intermediate frequency.
Next set of "S" Terms
