![]() ![]() 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). ![]()
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