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May 9, 2020 01:00 pm

US Military Is Furious At FCC Over 5G Plan That Could Interfere With GPS

An anonymous reader quotes a report from Ars Technica: GPS is facing a major interference threat from a 5G network approved by the Federal Communications Commission, U.S. military officials told Congress in a hearing on Wednesday. In testimony to the Senate Committee on Armed Services, Department of Defense Chief Information Officer Dana Deasy disputed the FCC's claims that conditions imposed on the Ligado network will protect GPS from interference. When the FCC approved Ligado's plan last month, the agency required a 23MHz guard band to provide a buffer between the Ligado cellular network and GPS. Deasy argued that this guard band won't prevent interference with GPS signals. Results from tests by federal agencies show that "conditions in this FCC order will not prevent impacts to millions of GPS receivers across the United States, with massive complaints expected to come," Deasy said. The FCC unanimously approved Ligado's application, but the decision is facing congressional scrutiny. "I do not think it is a good idea to place at risk the GPS signals that enable our national and economic security for the benefit of one company and its investors," Sen. James Inhofe (R-Okla.) said at the hearing, according to CNBC. "This is about much more than risking our military readiness and capabilities. Interfering with GPS will hurt the entire American economy." A spokesperson for FCC Chairman Ajit Pai called the military's concerns "baseless fear-mongering" in a statement quoted by Multichannel News. "The FCC made a unanimous, bipartisan decision based on sound engineering principles," the spokesperson said. The FCC said "the metric used by the Department of Defense to measure harmful interference does not, in fact, measure harmful interference," and that "testing on which they are relying took place at dramatically higher power levels than the FCC approved." "Ligado said Wednesday in a statement that it has gone to great lengths to prevent interference and will provide 'a 24/7 monitoring capability, a hotline, a stop buzzer or kill switch' and will 'repair or replace at Ligado's cost any government device shown to be susceptible to harmful interference,'" CNBC reported. The FCC also said it imposed a power limit of 9.8dBW on Ligado's downlink operations -- "a greater than 99 percent reduction from what Ligado proposed in its 2015 application," Pai said.

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