18WuD2x

square-law meter • ssc 651
deflection is proportional to the square of the applied
voltage.
square-law modulator A circuit or device that accomplishes
amplitude modulation of one signal
current by another, by simultaneously passing
the two currents through a component, such as a
nonlinear resistor, having a square-law response.
square-law response Circuit or component operation
that results in an output signal, proportional
to the square of the input.
square rooter An analog or digital device used to
extract the square root of a number.
square wave An alternating or pulsating current or
voltage whose rise and decay times are essentially
zero, and whose maxima and minima are essentially
flat. The duration of the maxima is equal to
the duration of the minima. A special form of
RECTANGULAR WAVE.
square-wave amplifier An amplifier designed to
operate with square waves.
square wave
square-wave converter See SQUARING CIRCUIT.
square-wave generator A signal generator delivering
an output signal that has a square waveform.
Compare SQUARING CIRCUIT, 1.
square-wave testing Testing the response of a circuit
or device, such as an amplifier, by observing
the extent to which it distorts a square-wave
signal passing through it (a measure of highfrequency
response).
squaring circuit 1. A circuit (such as a twin-diode
clipper, overdriven amplifier, or Schmitt trigger)
that converts a sine wave or pulse into a square
wave. 2. A circuit whose instantaneous outputsignal
amplitude is equal to the square of the instantaneous
input-signal amplitude.
squarish wave 1. A signal whose oscilloscope trace
is nearly, but not exactly, the same as that of a
square wave. 2. A rectangular wave that is not a
square wave; that is, whose maxima and minima
are not of the same duration. See RECTANGULAR
WAVE and SQUARE WAVE.
squawker 1. In a three-way speaker system, the
midrange speaker. 2. Any slave station in a multistation
intercom network.
squeal A high-pitched interferential sound, such
as that encountered in spuriously oscillating systems.
squeezeout In optical character recognition (OCR),
a condition in which errors occur because the
printed characters have excessive ink at the
edges. Also called smudge.
squegging A choking-type cutoff action in a circuit
caused by an excessively strong signal.
squegging oscillator An oscillator that starts and
stops oscillating intermittently as a result of
SQUEGGING.
squelch See SQUELCH CIRCUIT.
squelch amplifier An amplifier that can be controlled
by a squelch signal. Also see SQUELCH
CIRCUIT.
squelch circuit One of several circuits that automatically
disable a receiver or amplifier, except
when incoming signals exceed a predetermined
threshold amplitude. This action mutes the
equipment, eliminating annoying background
noise and unwanted signals. Also called MUTING
CIRCUIT.
squelch signal The activating or deactivating signal
delivered by a SQUELCH CIRCUIT.
squiggle See BLIP, 2.
squint 1. The angular resolution of a radar antenna.
2. The angular difference between the
antenna axis and the major lobe of a radar transmitter.
squirrel-cage induction motor See SQUIRREL-
CAGE MOTOR.
squirrel-cage motor An induction-type alternating-current
motor using a squirrel-cage rotor.
squirrel-cage rotor In an alternating-current motor,
a rotor composed of straight copper bars
embedded in a laminated soft-iron core and
short-circuited at the ends by rings. Its name is
derived from its resemblance to a revolving squirrel
cage.
squirter See SIGNAL INJECTOR.
SR 1. Abbreviation of SILICON RECTIFIER. 2. Abbreviation
of silicone rubber (see SILICONE).
3. Abbreviation of SHIFT REGISTER.
S-R Abbreviation of SEND-RECEIVE.
Sr Symbol for STRONTIUM.
sr Abbreviation of STERADIAN.
SRAM Abbreviation of static random-access memory.
S-rays See SECONDARY RAYS.
SRF Abbreviation of SELF-RESONANT FRE-
QUENCY.
S-RF meter A dual-function meter in a radio
transceiver. In the receiving mode, the meter indicates
S units. In the transmit mode, the meter
indicates relative output power.
SRR Abbreviation of SHORT-RANGE RADAR.
SS 1. Abbreviation of SOLID STATE. 2. Abbreviation
of SINGLE SHOT. 3. Abbreviation of small
signal. 4. Abbreviation of SINGLE SIGNAL. 5. Abbreviation
of same size. 6. Abbreviation of stainless
steel.
SSB Abbreviation of SINGLE SIDEBAND.
S S band A section of the S BAND extending from
2900 to 3100 MHz.
SSBSC Abbreviation of SINGLE-SIDEBAND SUP-
PRESSED CARRIER.
ssc Abbreviation of single-silk-covered (wire).