Tropospheric scatter

Tropospheric scatter

Tropospheric scatter (or troposcatter) is the scattering of distant TV and FM radio stations by the troposphere so that they travel farther than the line of sight. This effect sometimes allows reception of stations up to a hundred miles away.

The phenomenon has been used to build communication links in a number of parts of the world. Large billboard antennas focus a high power radio beam at the troposphere mid-way between the transmitter and receiver. A certain proportion of the signal is refracted and received at a similar antenna at the receiving station.

One such link operated between the North of Scotland, at Mormond Hill and the Shetland Isles.

The U.S. Army uses tactical tropospheric scatter systems developed by Raytheon for long haul communications. The systems come in two configurations, the original "heavy tropo", and a newer "light tropo" configuration exist. The systems provide four multiplexed group channels and trunk encryption, and 16 or 32 local analog phone extensions.

The U.S. Marine Corps also uses the same device, albeit an older version.

ee also

* Radio propagation
* Microwave
* ACE High - Cold war era NATO European troposcatter network
* White Alice Communications System - Cold war era Alaskan tropospheric communications link
* List of White Alice Communications System sites
* TV-FM DX

External links

* [http://www.engadget.com/2007/02/13/raytheon-live-demos-dart-t-troposcatter-communications/ DART-T]
* [http://www.trrlsever.org Russian tropospheric relay communication network]
* [http://www.its.bldrdoc.gov/fs-1037/dir-038/_5617.htm FS-1037C definition of tropospheric scatter]
* [http://rammstein.dfmk.hu/~s200/tropo.html Troposcatter communication network maps]


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Look at other dictionaries:

  • tropospheric scatter — ☆ tropospheric scatter n. scattering in the earth s troposphere, used in scatter communication at VHF and UHF for ranges beyond line of sight …   English World dictionary

  • tropospheric scatter — Telecommunications. transmission of radio frequency signals that have been scattered from irregularities in the troposphere to locations hundreds of kilometers distant. [1950 55] * * * tropospheric scatter, a way of transmitting radio, television …   Useful english dictionary

  • tropospheric scatter/troposcatter — The propagation of electromagnetic waves by scattering as a result of irregularities or discontinuities in the physical properties of the troposphere. At the frequencies above 150 MHz, the atmosphere has a scattering effect on electromagnetic… …   Aviation dictionary

  • tropospheric-scatter propagation — troposferos sklaidomas sklidimas statusas T sritis radioelektronika atitikmenys: angl. tropospheric scatter propagation vok. troposphärische Streuausbreitung, f rus. распространение за счёт тропосферного рассеяния, n pranc. propagation par… …   Radioelektronikos terminų žodynas

  • tropospheric scatter — Telecommunications. transmission of radio frequency signals that have been scattered from irregularities in the troposphere to locations hundreds of kilometers distant. [1950 55] * * * …   Universalium

  • tro|po scatter — «TROH puh», = tropospheric scatter. (Cf. ↑tropospheric scatter) …   Useful english dictionary

  • TOCU — tropospheric scatter (TROPO) orderwire control unit …   Military dictionary

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  • White Alice Communications System — The White Alice Communications System (WACS) was a United States Air Force telecommunication link system constructed in Alaska, during the cold war. It featured tropospheric scatter links and line of sight microwave radio links. It was… …   Wikipedia

  • Radio propagation — is a term used to explain how radio waves behave when they are transmitted, or are propagated from one point on the Earth to another. [ H. P. Westman et al, (ed), Reference Data for Radio Engineers, Fifth Edition , 1968, Howard W. Sams and Co.,… …   Wikipedia

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