TC 9-64 _________________________________________________________________________
distributed
The constants of inductance, capacitance, and
constants
resistance in a transmission line. The constants are
spread along the entire length of the line and cannot be
distinguished separately.
Doppler effect
The apparent change in frequency or pitch when a
sound source moves either toward or away from a
listener.
doublet
Another name for the dipole antenna.
driven array
An array in which all of the elements are driven.
driven element
An element of an antenna (transmitting or receiving)
that is connected directly to the transmission line.
echo
The reflection of the original sound wave as it bounces
off a distant surface.
The ability of a substance to return to its original state.
electromagnetic
The combination of an electric (E) field and a magnetic
field
(H) field.
electromagnetic
Man-made or natural interference that degrades the
interference
quality of reception of radio waves.
electromagnetic
The radiation of radio waves into space.
radiation
electric (E) field
The field produced as a result of a voltage charge on a
conductor or antenna.
electromagnetic
Any electromagnetic disturbance that interrupts,
interference (EMI)
obstructs, or otherwise degrades or limits the effective
performance of electronics/electrical equipment.
electromotive force
Electromotive force or voltage is electrical pressure that
(EMF)
can force the free electrons to move in the direction of
negative to positive.
element
A part of an antenna that can be either an active
radiator or a parasitic radiator.
end-feed method
Connecting one end of an antenna through a capacitor
to the final output stage of a transmitter.
end-fire array
An array in which the direction of radiation is parallel
to the axis of the array.
fading
Variations in signal strength by atmospheric conditions.
Glossary-4
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