TC 9-64 _________________________________________________________________________
resistance in a transmission line. The constants are
spread along the entire length of the line and cannot be
The apparent change in frequency or pitch when a
sound source moves either toward or away from a
Another name for the dipole antenna.
An array in which all of the elements are driven.
An element of an antenna (transmitting or receiving)
that is connected directly to the transmission line.
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.
The combination of an electric (E) field and a magnetic
quality of reception of radio waves.
electric (E) field
The field produced as a result of a voltage charge on a
Any electromagnetic disturbance that interrupts,
obstructs, or otherwise degrades or limits the effective
performance of electronics/electrical equipment.
Electromotive force or voltage is electrical pressure that
can force the free electrons to move in the direction of
negative to positive.
A part of an antenna that can be either an active
radiator or a parasitic radiator.
Connecting one end of an antenna through a capacitor
An array in which the direction of radiation is parallel
to the axis of the array.
Variations in signal strength by atmospheric conditions.