I doubt the FCC will be providing nighttime skywave coverage maps for AM stations as most don't have one, at least officially. I wrote it over a 6 year period from about 2009-2015. float: left; During the daytime there is little to no skywave propagation, so skywave interference does not normally occur. Nighttime skywave service is dependent on several factors, including seasonal effects, atmospheric fading, and the sunspot cycle. //width: 20%; All other colors should indicate a strong enough signal to receive outdoors. background-color: #ccc; /* Style the tab */ In many cases, skywave coverage must be evaluated along with nighttime groundwave signals. When the records are retrieved, look under each record for a series of links. text-align: left; width: 200px; width: 150px; Click on the "Service Area Map" link to retrieve the map page. My particular emphasis is mediumwave, mediumwave DXing, and the technical side of radio and propagation. Middle East • height:85px; It is not published, but a just private effort. If there is red coloring on nearby ridges then the signal often reflects well enough into non-colored areas. These divisions ensure that all records in that region are loaded into Google Earth for display. AM band is from 530 to 1710 kHz with 10 kHz step. } If the antenna gain is not listed in the database, 6 dBi is assumed. Technical Exhibits for FM and LPFM Applications RF Radiation Compliance Exhibits(OET Bulletin 65) TV Channel 6 Interference Studies Main Studio Location Mapping. cursor: pointer; Some stations do not have a 0.5 mV/m skywave contour; transmitter site only will be shown. + " MHz Channel " + j + " \n"); background-color: #f1f1f1; This application provides a visualization of the residential fixed broadband deployment data collected on FCC Form 477. /* Style the buttons inside the tab */ } .tabcontent { Why do FM Frequencies End in an Odd Decimal? This can result in some seriously degraded nighttime coverages. At night on the regional channels, the service contour is "limited" by the amount of interference that is caused co-channel. border: none; .tab button { " + i/10. FCC Compliance. Broadcast Electronic Filing (CDBS) { background-color: inherit; We make no determination here as to signal quality at any given location. RADIO-TIMETRAVELLER is a blog about radio and radio DXing, antennas, opinions, reviews - basically all things concerning radio. The Colorado DTRS coverage maps were generated using a free program called Radio Mobile. In many cases, FM or TV stations can be received at locations well beyond the location of the mapped contour, with interference-free reception becoming less likely at greater distances. Some AM stations do not operate with enough nighttime power to generate any 0.5 mV/m nighttime service contour. Nighttime groundwave contours not presently available. But please allow one map layer (link) to complete before adding another layer (link). Then open Google Earth, go to File | Open, and find the saved .kml file and select it. if(i < 1000) document.write("
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