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- Reference_distance abstract "In broadcast engineering, the reference distance is the distance which, under normal circumstances and flat terrain, a radio station would reach with a particular level of signal strength. This distance depends on two factors: effective radiated power (ERP) and height above average terrain (HAAT). The actual distance a station's signal travels depends highly on weather, where factors like temperature inversions and heavy precipitation have a strong and highly variable influence on radio propagation. However, for purposes of broadcast law such as construction permits and broadcast licenses, fixed calculations called propagation curves are applied to determine the reference distances for all existing and proposed stations. These also take into account beam tilt, carrier frequency, and even the Earth's curvature at longer distances.This is in turn used to define most broadcast classes for FM stations in North America. Each class (except D) is defined as having a maximum ERP and HAAT. If the HAAT of a station's radio antenna exceeds that specified for the class, it must reduce ERP so that its signal does not exceed the reference distance. The signal strength used differs by class, but generally the value is 1.0mV/m (millivolt per meter) or 60dBu (decibels over one microvolt per meter) for most of the United States, and 0.5mV/m or 54dBu in Canada, and for some U.S. stations in parts of certain areas including California, the Great Lakes region, and the Northeast. This is considered the service contour of a station by the Federal Communications Commission (FCC) and the Canadian Radio-television and Telecommunications Commission (CRTC), and by COFETEL in Mexico, according to NARBA and other international agreements among the three. The reference distances are in turn used to create mandatory minimum spacing distances among co-channel stations, and certain adjacent channels as well.Real-world calculations can also be done by including data from digital topographical maps, typically along 12 or 16 radials, and including the specifications from the radiation pattern for a directional antenna. However, this does not fit the definition of a reference in this sense, even though it determines the actual broadcast range of a station. This actual range is used in the reserved band in the U.S., while the reference distance is used for commercial radio stations.".
- Reference_distance wikiPageID "43933782".
- Reference_distance wikiPageLength "2810".
- Reference_distance wikiPageOutDegree "45".
- Reference_distance wikiPageRevisionID "626993383".
- Reference_distance wikiPageWikiLink Adjacent_channel.
- Reference_distance wikiPageWikiLink Antenna_(radio).
- Reference_distance wikiPageWikiLink Beam_tilt.
- Reference_distance wikiPageWikiLink Broadcast_class.
- Reference_distance wikiPageWikiLink Broadcast_engineering.
- Reference_distance wikiPageWikiLink Broadcast_law.
- Reference_distance wikiPageWikiLink Broadcast_license.
- Reference_distance wikiPageWikiLink Broadcast_range.
- Reference_distance wikiPageWikiLink COFETEL.
- Reference_distance wikiPageWikiLink California.
- Reference_distance wikiPageWikiLink Canada.
- Reference_distance wikiPageWikiLink Canadian_Radio-television_and_Telecommunications_Commission.
- Reference_distance wikiPageWikiLink Carrier_frequency.
- Reference_distance wikiPageWikiLink Category:Broadcast_engineering.
- Reference_distance wikiPageWikiLink Category:Broadcast_law.
- Reference_distance wikiPageWikiLink Co-channel.
- Reference_distance wikiPageWikiLink Co-channel_interference.
- Reference_distance wikiPageWikiLink Commercial_broadcasting.
- Reference_distance wikiPageWikiLink Commercial_radio.
- Reference_distance wikiPageWikiLink Construction_permit.
- Reference_distance wikiPageWikiLink Directional_antenna.
- Reference_distance wikiPageWikiLink Distance.
- Reference_distance wikiPageWikiLink Earths_curvature.
- Reference_distance wikiPageWikiLink Effective_radiated_power.
- Reference_distance wikiPageWikiLink FM_broadcasting.
- Reference_distance wikiPageWikiLink Federal_Commission_of_Telecommunications_(Mexico).
- Reference_distance wikiPageWikiLink Federal_Communications_Commission.
- Reference_distance wikiPageWikiLink Figure_of_the_Earth.
- Reference_distance wikiPageWikiLink Great_Lakes_region.
- Reference_distance wikiPageWikiLink Height_above_average_terrain.
- Reference_distance wikiPageWikiLink Inversion_(meteorology).
- Reference_distance wikiPageWikiLink List_of_North_American_broadcast_station_classes.
- Reference_distance wikiPageWikiLink Mexico.
- Reference_distance wikiPageWikiLink NARBA.
- Reference_distance wikiPageWikiLink Non-commercial_educational.
- Reference_distance wikiPageWikiLink North_America.
- Reference_distance wikiPageWikiLink North_American_Radio_Broadcasting_Agreement.
- Reference_distance wikiPageWikiLink Northeast_(US).
- Reference_distance wikiPageWikiLink Northeastern_United_States.
- Reference_distance wikiPageWikiLink Precipitation.
- Reference_distance wikiPageWikiLink Precipitation_(meteorology).
- Reference_distance wikiPageWikiLink Propagation_curve.
- Reference_distance wikiPageWikiLink Radial.
- Reference_distance wikiPageWikiLink Radiation_pattern.
- Reference_distance wikiPageWikiLink Radio_antenna.
- Reference_distance wikiPageWikiLink Radio_propagation.
- Reference_distance wikiPageWikiLink Radio_station.
- Reference_distance wikiPageWikiLink Reference.
- Reference_distance wikiPageWikiLink Reserved_band.
- Reference_distance wikiPageWikiLink Service_contour.
- Reference_distance wikiPageWikiLink Signal_strength.
- Reference_distance wikiPageWikiLink Temperature_inversion.
- Reference_distance wikiPageWikiLink Terrain.
- Reference_distance wikiPageWikiLink Topographic_map.
- Reference_distance wikiPageWikiLink Topographical_map.
- Reference_distance wikiPageWikiLink United_States.
- Reference_distance wikiPageWikiLink Weather.
- Reference_distance hasPhotoCollection Reference_distance.
- Reference_distance wikiPageUsesTemplate Template:Broadcasting.
- Reference_distance wikiPageUsesTemplate Template:Multiple_issues.
- Reference_distance subject Category:Broadcast_engineering.
- Reference_distance subject Category:Broadcast_law.
- Reference_distance hypernym Distance.
- Reference_distance type Agent.
- Reference_distance comment "In broadcast engineering, the reference distance is the distance which, under normal circumstances and flat terrain, a radio station would reach with a particular level of signal strength. This distance depends on two factors: effective radiated power (ERP) and height above average terrain (HAAT).".
- Reference_distance label "Reference distance".
- Reference_distance sameAs m.011x4h1g.
- Reference_distance sameAs Q18393852.
- Reference_distance sameAs Q18393852.
- Reference_distance wasDerivedFrom Reference_distance?oldid=626993383.
- Reference_distance isPrimaryTopicOf Reference_distance.