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Loran-C Decommissioning Begins Feb. 8

A Notice of Availability from the U.S. Coast Guard in the Jan. 7 Federal Register states "The USCG intends to begin termination of the broadcast of the North American Loran-C Radionavigation Signal beginning on or about Feb. 8, 2010. Loran stations are expected to cease transmitting the Loran-C radionavigation signal by Oct. 1, 2010."

Loran-C transmits in spectrum between 90 kHz and 110 kHz. Precisely timed transmissions from multiple stations have been used for navigation, location and timing services for civilian and military air, land and marine users in the continental United States and Alaska. The transmitters operate at powers of up to 4,000 kW (peak). Loran-C was once envisioned as a backup to the GPS system, but the U.S. Coast Guard, which is part of the Department of Homeland Security, has decided it was no longer needed.

Doug Lung is one of America's foremost authorities on broadcast RF technology. He has been with NBC since 1985 and is currently vice president of broadcast technology for NBC/Telemundo stations.