Critical hours
Critical Hours is that time from sunrise to two hours after sunrise, and from two hours before sunset until sunset, local time. During that time, certain American radio stations may be operating with reduced power as a result of Section 73.187 of the Federal Communications Commission's Rules.[1]
Canadian Restricted Hours are similar to Critical Hours, except that the restriction results from the January 17, 1984, U.S.-Canadian AM Agreement. Canadian Restricted Hours are called "Critical Hours" in the U.S.-Canadian Agreement, but in the AM Engineering data base, the FCC calls them "Canadian Restricted Hours" to distinguish them from the domestically defined critical hours. Canadian Restricted Hours is that time from sunrise to one and one-half hours after sunrise, and from one and one-half hours before sunset until sunset, local time. U.S. stations operate with restricted hours because of Canadian stations, and vice-versa.[1]
This information was published by the FCC, an arm of the United States Government, and is in the public domain.
References
- ^ a b "AM Engineering Data Base for Public Release" (TEXT). AM Engineering Data Base. FCC Mass Media Bureau, Audio Services Division. 1997-04-21. Retrieved 2006-12-28. Cite error: The named reference "FCCamtext" was defined multiple times with different content (see the help page).