5.10. Frequency Spectrum Interference / Impedance Using a new transmission frequency that is near an existing frequency;
The frequency spectrum is the entire range of electromagnetic frequencies
used for communications and other transmissions, which includes
communication channels used for radio, cellular phones, and television. In
the performance of typical operations, the military relies on a range of
frequencies for communications and support systems. Similarly, public and
private users rely on a range of frequencies in the use of cellular telephones
and other wireless devices used on a daily basis. Reducing the distance between two antennas transmitting on a
similar frequency;
Increasing the power of a similar transmission signal;
Using poorly adjusted transmission devices that transmit outside their
assigned frequency or produce an electromagnetic signal that
interferes with a signal transmission; and
Technical Background Existing electronic sources and uses created by portable systems
affecting entire communities utilizing Wi‐Fi broadband systems and
industrial sources that produce electronic noise by‐product.
The military's use of frequency spectrum allows for safe operations and the
effective delivery of weapons on‐target without interference. The military’s
frequency spectrum needs for testing, evaluation, and training are
constantly increasing, while the spectrum available for DOD use is
decreasing. The National Telecommunications and Information
Administration (NTIA) Office of Spectrum Management explains that:
…almost every agency of the Federal Government uses the spectrum
in performing mandated missions. The DOD uses the spectrum
extensively for tactical uses and non‐tactical uses. In the United
States tactical uses are generally limited to a number of specific
testing sites and training facilities, but DOD's non‐tactical
applications are extensive and include aircraft command and
control, mobile communication in and around military bases, and
air fields and long distance communications using satellites.
Frequency interference is related to other transmission sources.
Interference can result from a number of factors, including:
June 2017
In order to successfully complete its operational activities within the
installation and its training areas, the military relies on a range of
frequencies for communications and support systems. Since 1993, Congress
has been selling federal spectrum bands for reallocation to the private
sector, promoting the development of new telecommunications
technologies, products, and services. The expanding public and commercial
use of the frequency spectrum from wireless transmitters to consumer
electronics can encroach on the military’s use of the frequency spectrum.
Increasing community and DOD demands for this important resource can
create conflicts for all users.
Key Terms
Frequency Impedance. Frequency impedance refers to the interruption of
electronic signals due to the existence of a structure or object between the
source of the signal and its destination (receptor). Certain structures have
the potential to block, or imp