Nor can we honor requests for special maps or additional service or interfering contours, or computations of area or population within these service contours. Searches and Studies. For best results, allow one region's records to fully display before adding additional contour maps.

If there is red coloring on nearby ridges then the signal often reflects well enough into non-colored areas.

I wrote it over a 6 year period from about 2009-2015. COVERAGE MAPS: Radio station engineering and promotional maps background-color: #ccc;

Tower Light Outages -- Report to the FAA promptly! .tab {

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+ "'> " + i/10.    Public Participation in the License Renewal ProcessTransmission line calculationsTranslators and BoostersService Contour Data Points (FM)Service Contour Maps via the FM Query - (select the Detailed output option)Subcarriers, Subsidiary Communications Authority (SCA) Low Power FM Broadcast Radio StationsLow Power FM (LPFM) Channel FinderPublic Inspection Files online search, AM QueryFM QueryTV QueryCDBS Public Access searchesDistance between 2 CoordinatesFind Community CoordinatesFind Terminal CoordinatesFM and TV Propagation Curves Calculations

During the daytime there is little to no skywave propagation, so skywave interference does not normally occur. } outline: none; They are included to show potential limitations on U.S. AM broadcast station service, and to help identify such signals. Maximum power currently allowed is 50 kW for Clear-channel stations. Southeast Asia •    Application Processing Fees & Fee Guides .tabcontent { } The only stations that have a recognized and protected nighttime service contour are the old clear channel stations. 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. .tab button { All other colors should indicate a strong enough signal to receive outdoors.

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These maps are drawn using engineering data from the FCC. FCC Predicted Contour Maps.

   Public Participation in the License Renewal ProcessService Contour Maps via the TV Query - (select the Detailed output option), Annual Reports of the FCC and FRCHistory of Cimmercial RadioRadio History DocumentsRadio Service Bulletins, 1915 to 1932FM Radio Stations, 1936 to 1947Radio History Cards Without Facility ID Numbers. FM Radio Coverage Maps.

   Public Participation in the License Renewal ProcessSampling Systems - Criteria for Approval display: block;

At the FM Query or TV Query search form, enter your search parameters, and select the longer, detailed Query output. Red and yellow should be a strong enough signal to receive indoors. A loss of 4.5 dB is assumed in the combiner at the output of the transmitters. /*-->*/. min-width:200px; height:85px;

Files are generally updated each day. Return to the link, right click and "Save As" to your device as a text file with the extension of ".kml" (instead of ".txt").

These maps do not consider all factors, thus, actual nighttime service may differ from that portrayed on these maps.

Thanks for sharing the information with gospel, Dear Bill, I would like to be able to recreate maps like yours for historical AM stations from 1920 to up to 1940s.I found old magazine with the list of all the stations for every year.I know their wattage and I know from what city they were broadcasting.But I dont know much about the info on the transmitters they were using, for example the height of the antenna etc.I would want to then incorporate what I have with info on ground conductivity and ground elevation etc.You mention you use your own software? ]]>, Map area:   EAST of 85° West Longitude (Eastern USA)WEST of 85° to 105° West Longitude (Central USA)WEST of 105° West Longitude (Western USA).

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AM Query-- Search for information on stations AM Broadcast Station Classes and Clear, Regional, and Local Channels AM and FM Single Frequency Maps on Google Earth ALLO Preliminary AM Study AM Revitalization (includes FM Translators for AM stations) AMwave Critical Hours (Section 73.187) - Class B and D only This application provides a visualization of the residential fixed broadband deployment data collected on FCC Form 477. The coverage maps are an approximation of what one might expect in the field. . The receiver is assumed to be a hand held scanner at 1.5 meters above ground, with 0 dBi antenna gain.

var j=201; These maps are cool, how are they drawn?

+ "'> " + i/10. This is normal.

Although new stations have to protect existing stations, there is no requirement for existing stations to protect new stations at night.

My maps are mainly meant for the AM DXer, to see what the possibilities might be.