18WuD2x

Gunnplexer • G-Y signal 325
erable transmission range is possible. Used primarily
by experimenters, and in wireless communications
links. See GUNN DIODE.
gutta percha A hard, rubberlike, organic insulating
material. Dielectric constant, 3.3 to 4.9. Dielectric
strength, 203 to 508 kV/in.
guyed tower In radio communications or in microwave
links, a structure that is supported by
one or more sets of guy wires to add strength and
to prevent collapse.
guying The support of a radio communications or
microwave-link tower by the use of one or more
sets of guy wires.
guy insulator Also called egg insulator. An insulator
designed to electrically break a guy wire while
maintaining its ability to support a structure.
Such an insulator has two slots with holes placed
at right angles, in such a position that the wire
will not separate even if the insulator breaks. The
stress exerted on the insulator is compression,
and the insulating material is stronger under this
type of stress than under tension (pulling).
guy insulator
guy wire A bracing wire for antenna masts or towers.
gyrator An active (usually cascaded-transistor) device
exhibiting nonreciprocal phase shift. It provides,
among other functions, the simulation of
inductance using capacitors.
gyro Contraction of GYROSCOPE.
gyro- A prefix meaning “pertaining to gyroscopes,”
“containing a gyroscope,” or “behaving like a gyroscope.”
gyrocompass A type of compass in which a spinning
gyroscope, acted upon by the earth’s rotation,
causes the device to point to true north.
Compare MAGNETIC COMPASS.
gyrofrequency The natural frequency of rotation
of charged particles around the earth’s magnetic
lines of flux.
gyromagnetic Pertaining to the magnetic properties
of rotating electric charges (e.g., the effect of
electrons spinning inside an atom).
gyromagnetic effect The tendency of a rotating
body to become magnetized because of the magnetic
field of the earth.
gyropilot See AUTOPILOT.
gyroscope A device that consists of a spinning
wheel mounted in a gimbal. The shaft of the
wheel will point in one direction, despite the
movement of the earth beneath it.
gyrostat See GYROSCOPE.
G-Y signal In a color-television circuit, the signal
representing primary green (G) minus luminance
(Y). A primary green signal is obtained when the
G-Y signal is combined with the luminance (Y)
signal. Compare B-Y SIGNAL and R-Y SIGNAL.