This will be shown by the light blue lines on the map. FM translators' service contours are plotted in pink at the location corresponding to a 60 dBu field strength.ĪM Daytime Groundwave Service Contour: Daytime coverage is generally protected from interference caused by other stations within the 0.5 mV/m (millivolts per meter electric field strength) contour. Map Considerations FM Stations: FM and Low Power FM (service codes FM and FL) service contours are plotted using light blue lines at the field strength applicable to the station class and location (see FM Station Classes and Service Contours for details). For best results, allow one region's records to fully display before adding additional contour maps.Ĭontours are provided as-is, and users should be aware that the mapped information may not be identical to that used for radio broadcast application processing. This division ensures that all records in that region are loaded into Google Earth for display. There are no plans to add daytime groundwave contours for stations outside the USA.ĪM Records are divided into two sections - East (of 90° W Longitude) and West (of 90°W Longitude. . We do not guarantee accuracy for such records. AM broadcast station service, and to help identify such signals. They are included to show potential limitations on U.S. Nighttime skywave contours for stations outside the USA are based on notified parameters, some of which might be years out of date. We make no determination here as to signal quality at any given location. Secondary nighttime skywave service (orange contour) is also dependent on whether interference exists from other stations. Nighttime skywave service is dependent on several factors, including seasonal effects, atmospheric fading, and the sunspot cycle. In the USA, 530 kHz and 1610 kHz are used for TIS stations, but they may be used on any AM frequency on a non-interference basis. Low power Travelers' Information Stations in the AM band are not shown. However, these will be the sameĪs the daytime contours for stations operating with the same parameters day and night. Nighttime groundwave contours not presently available.Some stations do not have a 0.5 mV/m skywave contour transmitter site only will be shown.0.5 mV/m Nighttime Skywave Contour from stations outside the USA (pink).0.5 mV/m Nighttime Skywave Contour (Class B,C,D) - Secondary Service (light orange).0.5 mV/m Nighttime Skywave Contour (Class A) - Primary Service (light blue).0.5 mV/m Daytime Protected Service Contour (light blue).Use the maps at your own risk, the FCC makes no representation of their suitability for any particular purpose.Ĭomments may be directed to Dale.Bickel, Daytime Groundwave Service (0.5 mV/m + 2.0 mV/m) Please be aware that these maps are subject to change and correction without notice, and the contours shown may not always correspond to service contours and areas used in broadcast radio application processing.
FM EDITOR RANKING INFORAMTION FOR LEVEL HOW TO
We strongly recommend that you review the Making These Maps Work for You and Map Considerations tabs on the left, to learn how to make the maps function on your device. Google Earth (or other KML browser) must be installed on your device. They are also helpful for DXing (long distance listening), particularly on the AM broadcast band at night. These maps - which show the nationwide distribution of stations on a specific frequency - are useful for eyeballing broadcast radio or television service to a desired region.
FM EDITOR RANKING INFORAMTION FOR LEVEL FULL
TV results include full service television as well as Class A TV and low power stations. FM results include licensed FM stations, low power FM (LPFM) stations, and FM translator (repeater) stations. AM options include daytime groundwave coverage and nighttime primary and secondary skywave coverage. Click on a frequency or channel to generate a map of the AM, FM, or TV licensed stations in the USA that are using the specific frequency or channel. The AM Maps by Frequency, FM Maps by Frequency, and TV Maps by Channel tabs on the left open searches of AM and FM frequencies, or Television channels. About Single Frequency Maps for AM, FM, and TV
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