proposed rulemaking in 1967 (Operation by Standard Broadcast Stations, 8 FCC 2d 698 (1967)). There were major concerns of skywave interference to clear channel stations, so only a handful of stations were permitted to apply. On February 25, 1981, the FCC determined that there were no detrimental effects to clear-channel stations in remote areas, therefore, they permitted even more stations to apply for authorization. Current authorization Applications for PSRA and PSSA operation are no longer required. The licensee must merely notify the FCC. External links 47 CFR 73.99 (Official) FCC Radio and Television Rules 47 CFR Part 73 (Official) FCC Rules and Regulations (unofficial) Broadcast engineering