18WuD2x

single-line tap • single-track recorder 633
single-inline package
single-line tap In a telephone system, a connection
that provides or designates a separate line
(e.g., to serve a single household).
single-loop feedback Feedback through only one
path.
single phase Pertaining to the presence or generation
of one alternating-current phase only. Compare
POLYPHASE.
single-phase full-wave Pertaining to a rectifier operated
from a single-phase alternating-current (ac)
power line, and rectifying both half-cycles of ac
voltage. Compare SINGLE-PHASE/HALF WAVE.
single-phase/full-wave bridge A bridge rectifier
operated from a single-phase alternating-current
supply, usually from the untapped secondary
winding of a transformer. Compare SINGLE-
PHASE/FULL-WAVE CIRCUIT and SINGLE-
PHASE/HALF-WAVE CIRCUIT.
single-phase/full-wave circuit A rectifier circuit
in which each half-cycle of single-phase alternating
current is rectified by a separate diode supplied
from the ends of a center-tapped winding of
a transformer. Compare SINGLE-PHASE/FULL-
WAVE BRIDGE and SINGLE-PHASE/HALF-
WAVE CIRCUIT.
single-phase/half-wave Pertaining to a rectifier
operated from a single-phase alternating-current
(ac) power line, and rectifying only one half-cycle
of ac voltage.
single-phase/half-wave circuit A rectifier circuit
in which a diode, output load, and single-phase
alternating-current supply are connected in series,
only one half-cycle of the cycle being passed
by the diode. Compare SINGLE-PHASE/
FULL-WAVE CIRCUIT and SINGLE-PHASE/
FULL-WAVE BRIDGE.
single-phase rectifier See SINGLE-PHASE/
FULL-WAVE BRIDGE, SINGLE-PHASE/FULL-
WAVE CIRCUIT, and SINGLE-PHASE/HALF-
WAVE CIRCUIT.
single-point ground One ground connection to
which all channels of a circuit are returned. Such
a common connection eliminates or greatly minimizes
the common coupling often encountered
when separate ground points are used.
single-pole double-throw Abbreviation, SPDT. Descriptive
of an electrical, electronic, or mechanical
switch with a pole that can be connected to
either of two adjacent poles, but not to both.
single-pole single-throw Abbreviation, SPST. Descriptive
of an electrical, electronic, or mechanical
switch with a pole that can be connected to an
adjacent pole (or disconnected from it) at will. It is
used to provide the make and break function in a
single circuit.
single rail 1. A one-conductor communications
medium with a ground return. 2. A one-conductor
data line, with a ground return.
single shot Also called one shot. Pertaining to circuit
operation in which a single input pulse applied to a
switching device (such as a multivibrator) causes it
to deliver a single output pulse, rather than switch
to a stable “on” state. A MONOSTABLE MULTIVI-
BRATOR operates in this mode.
single-shot multivibrator See MONOSTABLE
MULTIVIBRATOR.
single sideband Abbreviation, SSB. Pertaining to a
system of modulation in which one of the sidebands
from an amplitude-modulated signal is attenuated
or canceled out, leaving only one
sideband. The carrier is generally suppressed also.
single-sideband suppressed-carrier Abbreviation,
SSSC or SSBSC. Pertaining to a system of modulation
in which the carrier and one sideband from an
amplitude-modulated signal are suppressed; only
the remaining sideband is transmitted. Sometimes
this mode is simply called SINGLE SIDEBAND.
single signal Pertaining to a mode of reception in
which signals appear on only one side of zero
beat, enhancing selectivity and reducing interference
among received signals. Most superheterodyne
receivers have this feature; most
direct-conversion receivers do not.
single-signal receiver A superheterodyne receiver
that achieves high selectivity via a selective filter
in the intermediate-frequency amplifier chain.
Signals appear on only one side of zero beat, in a
band whose width can be adjusted or selected for
various values from about 200 Hz to 3 kHz.
single silk-covered wire Wire insulated with one
layer of silk.
single-skip propagation See SINGLE-HOP PROP-
AGATION.
single-step operation See STEP-THROUGH OP-
ERATION.
single sweep In an oscilloscope, a single time-axis
deflection of the electron beam. Also see SWEEP,
1, 2. Compare RECURRENT SWEEP.
single-sweep blocking oscillator A blocking oscillator
that cuts off after generating a single cycle
or pulse.
single-throw switch A single-action switch with
two or more poles.
single-tone keying Modulated continuous-wave
keying. A single audio-frequency tone is used to
amplitude-modulate or frequency-modulate the
carrier.
single-track recorder A recorder, such as a magnetic-tape
recorder or a graphic recorder, that
permits recording along only one track.