________________________________________________________________________Glossary
twisted pair
A line consisting of two insulated wires twisted together
to form a flexible line without the use of spacers.
two-wire open line
A parallel line consisting of two wires that are generally
spaced from 2 to 6 inches apart by insulating spacers.
two-wire ribbon
A parallel line similar to a two-wire open line except
(twin lead)
that uniform spacing is assured by embedding the two-
wires in a low-loss dielectric.
ultrahigh frequency
The range of the radio frequency spectrum extending
(UHF)
from 30 MHz to 3 GHz.
ultrasonic
Sounds above 20,000 hertz.
unidirectional array
An array that radiates in only one general direction.
untuned line
Another name for the flat or nonresonant line.
V antenna
A bidirectional antenna, shaped like a V, which is
widely used for communications.
velocity
The rate at which a disturbance travels through a
medium.
vertical axis
On a graph, the straight-line axis oriented from bottom
to top.
vertical pattern
The part of a radiation pattern that is radiated in the
vertical plane.
vertically polarized
Waves radiated with the E field component
perpendicular to the earth's surface.
very high frequency
The range of the radio frequency spectrum extending
(VHF)
from 30 MHz to 300 MHz.
voltage-feed method
Same as END FEED METHOD.
voltage standing-
The ratio of maximum to minimum voltage of a
wave ratio (VSWR)
transmission line.
wave antenna
Same as BEVERAGE ANTENNA.
wave motion
A recurring disturbance advancing through space with
or without the use of a physical medium.
wave train
A continuous series of waves with the same amplitude
and wavelength.
Glossary-15
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