Geneva Frequency Plan of 1975

Geneva Frequency Plan of 1975

The Geneva Frequency Plan of 1975 (GE75) is the internationally agreed frequency plan which was drawn up to implement the provisions of the Final Acts of the Regional Administrative LF/MF Broadcasting Conference (Regions 1 and 3) held in Geneva, Switzerland, in 1975. It covers radio broadcasting in the long and medium wave bands outside the Americas (separate agreements being in place for North and South America).

The plan was drawn up under the auspices of the World Administrative Radio Conference (WARC) of the International Telecommunication Union (ITU) with the assistance of the European Broadcasting Union (EBU/UER)

The Geneva plan replaced the 1948 Copenhagen plan. It became necessary because of the large number of broadcasting stations in these frequency ranges leading to ever more mutual interference. That Geneva wave plan entered into force on 23 November 1978 and although its intended lifespan was only until 1989 it is still valid (with small modification by mutual coordination between countries) today.

Most existing European radio stations were required to change their broadcasting frequencies following implementation of the plan. In most cases the changes were slight (only one or two kilohertz) but were more drastic in some cases, particularly in the United Kingdom, where all BBC national stations moved to a new wavelength or band. [http://www.arar93.dsl.pipex.com/mds975/Content/ukradio3.html] However the increased number of radio services and reduction (in most cases) of interference to radio signals (particularly at nighttime) was considered by broadcasters to be worth the initial inconvenience.

As a result of the plan most medium wave (and later longwave) stations outside North and South America operate on exact multiples of 9 kHz which helps reduce heterodyne interference.

Predecessors to the GE75 Plan

* Geneva 1925 (effective 14 Nov 1926) 10 kHz spacings on MW;
* Brussels 1928 (effective 13 Jan 1929) 9 kHz spacings on MW (10 kHz above 1000 kHz);
* Prague 1929 [http://www.fcc.gov/ftp/Bureaus/Mass_Media/Databases/documents_collection/radio_service_bulletins/290531.pdf] (effective 30 June 1929) "European Radio-electric Conference of Prague 1929" 9 kHz spacings on MW (10 kHz above 1400 kHz);
* Madrid/Lucerne 1932 [http://www.bbceng.info/Technical%20Reviews/Development_of_the_BBC_AM_Transmitter_Network4.pdf] (effective 15 Jan 1934) "Lucerne Convention European Wavelength Plan" Mostly 9 kHz spacings but not harmonic multiples;
* Montreaux 1939 (was to be effective 1940 but never implemented due to World War II);
* Copenhagen 1948 [http://buizenradio.verdijk.info/afstemschaal/kopenhagen.html] (effective 15 Mar 1950) "European LW/MW Conference Copenhagen 1948 (European broadcasting convention)" Mostly 9 kHz (8 kHz above 1529 kHz 7, 8 and 9 kHz on LW) spacings but not harmonic multiples—offset 1 kHz on MW and (generally) 2 kHz on LW.

ee also

*AM radio
*Mediumwave
*MW DX
*Longwave
*North American Radio Broadcasting Agreement

External links

* [http://www.wabweb.net/radio/listen/LWMWeu78.pdf] German list of GE75 assignments
* [http://www.itu.int/ITU-R/publications/brific-ter/files/ge75/ recently agreed amendments to the GE75 plan]
* [http://www.bbceng.info/Technical%20Reviews/dev_am_tx_nw_6a.pdf#search=%22%22channel%20spacings%20for%20Europe%20were%20kept%20at%209%20kHz%22%22 Development of MW transmission in Britain]
* [http://209.85.135.104/translate_c?hl=en&u=http://buizenradio.verdijk.info/afstemschaal/golflengtes.html&prev=/search%3Fq%3DCOPENHAGEN%2BPLAN%2B1948%2BkhZ%26start%3D10%26hl%3Den%26sa%3DN (Translated) Dutch article]


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Medium wave — Main article: Medium frequency Medium wave (MW) is the part of the medium frequency (MF) radio band used mainly for AM broadcasting. For Europe the MW band ranges from 526.5 kHz to 1606.5 kHz[1] and in North America an extended MW… …   Wikipedia

  • North American Radio Broadcasting Agreement — The North American Radio Broadcasting Agreement, usually referred to as NARBA, is a treaty that took effect in March 1941 and set out the bandplan and interference rules for mediumwave AM broadcasting in North America. Although mostly replaced by …   Wikipedia

  • Deutschlandfunk — s logo. Deutschlandfunk (DLF) is a German public broadcasting radio station, broadcasting national news and current affairs. Contents 1 History 1.1 …   Wikipedia

  • Shipping Forecast — The Shipping Forecast is a four times daily BBC Radio broadcast of weather reports and forecasts for the seas around the coasts of the British Isles. It is produced by the Met Office and broadcast by BBC Radio 4 on behalf of the Maritime and… …   Wikipedia

  • Wöbbelin — Infobox Ort in Deutschland Wappen = kein lat deg = 53 | lat min = 23 lon deg = 11 | lon min = 30 Lageplan = Wöbbelin in LWL.png Lageplanbeschreibung = Bundesland = Mecklenburg Vorpommern Landkreis = Ludwigslust Amt = Ludwigslust Land Höhe = 34… …   Wikipedia

  • Regional Radiocommunication Conference — A Regional Radiocommunication Conference (RRC) is a meeting held between members of the International Telecommunication Union from one or more ITU Regions, but from the whole world. Such a meeting is normally used to put in place an agreement on… …   Wikipedia

  • FM broadcasting — See also: frequency modulation and FM broadcast band FM broadcasting is a broadcasting technology pioneered by Edwin Howard Armstrong which uses frequency modulation (FM) to provide high fidelity sound over broadcast radio. The term FM band… …   Wikipedia

  • Nobel Prizes — ▪ 2009 Introduction Prize for Peace       The 2008 Nobel Prize for Peace was awarded to Martti Ahtisaari, former president (1994–2000) of Finland, for his work over more than 30 years in settling international disputes, many involving ethnic,… …   Universalium

  • BIBLE — THE CANON, TEXT, AND EDITIONS canon general titles the canon the significance of the canon the process of canonization contents and titles of the books the tripartite canon …   Encyclopedia of Judaism

  • United Nations — 1. an international organization, with headquarters in New York City, formed to promote international peace, security, and cooperation under the terms of the charter signed by 51 founding countries in San Francisco in 1945. Abbr.: UN Cf. General… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”