TC 9-64 _________________________________________________________________________
lumped constants
The properties of inductance, capacitance, and
resistance in a transmission line.
lumped-impedance
The insertion of an inductor or capacitor in series with
tuning
an antenna to lengthen or shorten the antenna
electrically.
magnetic (H) field
The field produced when current flows through a
conductor or antenna.
major lobe
The lobe in which the greatest amount of radiation
occurs.
Marconi antenna
A quarter-wave antenna oriented perpendicular to the
earth and operated with one end grounded.
maximum usable
Maximum frequency that can be used for
frequency (muf)
communications between two locations for a given time
of day and a given angle of incidence.
medium
The substance through which a wave travels from one
point to the next. Air, water, and wood are examples of
a medium.
medium frequency
The range of the radio frequency spectrum extending
(MF)
from 300 kHz to 3 MHz.
minor lobe
The lobe in which the radiation intensity is less than a
major lobe.
multielement array
An array consisting of one or more arrays and classified
as to directivity.
multielement
An array that contains two or more parasitic elements
parasitic array
and a driven element.
multipath
The multiple paths a radio wave may follow between
transmitter and receiver.
natural horizon
The line-of-sight horizon.
negative alternation
The portion of a sine wave below the reference line.
node
The fixed minimum points of voltage or current on a
standing wave or antenna.
noise (of sound)
An unwanted disturbance caused by spurious waves
that originate from man-made or natural sources.
nondirectional
See OMNIDIRECTIONAL.
Glossary-8
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