18WuD2x

Rieke chart • ripple 601
ultra-high-frequency (UHF) and microwave frequency
bands for determining the optimum load
impedance.
rig Colloquialism for a radio communications installation—especially
a transmitter or transceiver.
It is commonly used among amateur radio
operators.
right-angle line section See ELL.
right-hand lay See DIRECTION OF LAY.
right-hand polarized wave See CLOCKWISE-
POLARIZED WAVE.
right-hand rule for induced emf See FLEMING’S
RIGHT-HAND RULE.
right-hand rule for wire A simple rule for indicating
the direction of the magnetic field surrounding
a straight wire that carries current. When the
wire is grasped in the right hand with the thumb
pointing in the direction of current flow, the fingers
curl in the direction of the magnetic field.
right-hand taper Potentiometer or rheostat taper
in which most of the resistance is in the clockwise
half of rotation, as viewed from the front. Compare
LEFT-HAND TAPER.
right justified In a computer memory location, a
data item that takes up consecutive bit positions,
from right to left.
Right-Leduc effect A phenomenon somewhat
analogous to the Hall effect. When a metal strip
conducting heat is placed in a magnetic field perpendicular
to the plane of the strip, a temperature
difference develops across the strip.
right shift In computer operation, a shift whereby
word bits are displayed to the right; the effect is
division in a right arithmetic shift.
rim drive 1. In a tape recorder, a driving method in
which the motor shaft is provided with a smooth
pulley that transfers motion directly to the rubber-tired
rim of the flywheel. 2. A driving method
for a phonograph turntable in which a rotating
wheel contacts the outer edge of the platter.
R in Symbol for INPUT RESISTANCE. (Also, R i .)
ring
1. The core of a toroidal coil. 2. See HYBRID
RING. 3. See RING MODULATOR. 4. See RING
INDUCTOR. 5. See RING MAGNET. 6. See RING-
ING.
ring armature A motor or generator armature having
a ring winding.
ringback In a telephone system, the signal sent
from the receiving (destination) telephone set
back to the sending (source) set, indicating that
the signal is being received. This consists of a
tone, interrupted by pulses at intervals of about
0.05 second. The signal stops when the destination
set is taken off the hook. Also see RING-
DOWN.
ring circuit 1. See RING MODULATOR. 2. A
waveguide hybrid-tee resembling a ring having
radial branches. 3. In amateur radio operations,
a circuit connected to a telephone line and radio
transmitter. The radio transmitter is energized
and modulated with an identifiable signal each
time the telephone rings, so the telephone can be
answered via remote control.
ring counter An electronic counter in which successive
cascaded stages form a ring (i.e., the last
stage in the chain is connected to the first stage
so that the counter advances through the cycle,
stage by stage, repetitively).
ringdown In a telephone system, the signal sent
from the transmitting (source) set to the receiving
(destination) set, causing the destination set to
ring. Also see RINGBACK.
ring head In tape recorders, a recording and playback
head that consists essentially of a metal ring
with a gap at one point, and on which the coils
are wound.
ring inductor 1. An inductor consisting of a single
turn of wire, or of a conductor bent into a loop.
2. See SHADING COIL.
ringing Self oscillation in a pulsed inductancecapacitance
circuit, sustained by the circuit’s flywheel
action (hysteresis), and usually producing
a damped wave.
ringing coil In the horizontal oscillator in a television
circuit, a small, adjustable coil (shunted by a
capacitor) used to produce a sharp rise in inputsignal
voltage.
ringing current In wire telephony, an alternating
current superimposed on the direct operating
current. Produces RINGDOWN.
ringing time See RING TIME, 1.
ring magnet A permanent magnet in the shape of
a ring or donut.
ring main An electric power main that is closed to
form a ring. This results in two independent electrical
paths between any two points in the circuit.
If one path is interrupted, power can still be
transmitted to any other point in the circuit from
a power station.
ring modulator A double-balanced diode-type
modulator circuit; its name is derived from the
ring-like arrangement of the four diodes.
ring oscillator A self-excited oscillator in which
two sets of two transistors are operated in pushpull/parallel.
ring shift In computer operation, the cyclic shifting
of digits from one end of a register to the
other.
ring time 1. The period of a damped oscillation—
especially one set up in an inductance-capacitance
circuit by a pulse. 2. The time required for
an ECHO BOX signal to decay below the display
level.
ring winding A winding in which the turns of the
coil are laid on the outside of a ring-shaped core
and passed through its center, resulting in a
donut coil with a core.
ripple 1. A small alternating-current component in
the output of a direct-current power supply with
inadequate filtering. 2. In computer and dataprocessing
operations, the serial transmission of
data.