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"To be blunt, the nation's commerce will grind to a halt" unless 5G service is restricted around major airports, the CEOs said in a letter Monday to government officials. The CEOs of 10 passenger and cargo airlines, including American, Delta, Southwest, United and FedEx, are urging federal officials, including Transportation Secretary Pete Buttigieg, to establish two mile 5G-free buffer zones around runways. Both of these effects result in interference from a neighboring band."ĭue to the possibility of interference with such critical navigational equipment, the FAA has issued so-called Notices Of Air Missions that would prohibit certain aircraft from landing at dozens of airports around the country, even at times when skies are clear and visibility is not poor.
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"Also, radio receivers cannot perfectly filter out the signals transmitted in neighboring bands and so will receive some out-of-band interference. "The underlying issue here is that radio signals cannot be perfectly confined to their assigned frequency band and will result in some energy being transmitted in neighboring bands," adds Northwestern University electrical engineering professor Randall Berry.
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It's similar to the way that CB-radios would sometimes interfere with old TV sets, before cable and digital signals, according to Rappaport. They don't have very good filters on their receivers," says Rappaport. "The issue is that some of the older planes and older aircraft equipment that were built maybe 30 or 40 years ago do not have very good band pass filters. Pilots like DePete worry that strong 5G signals from cell phone towers placed close to airport runways could interfere with the radio altimeters. "The radio altimeters on our aircraft determine not only the height above the ground, in real terms, above the terrain as we come in for a landing or we're taking off," said Joe DePete, head of the Air Line Pilots Association, in a recent interview with Yahoo Finance, adding that the altimeters are also "tied to many other systems in our aircraft."Īltimeters are critical for pilots to use during bad weather when visibility is poor.
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The segment of the spectrum in the "C" band purchased by AT&T and Verizon happens to sit right next to the frequencies used by radio altimeters in aircraft. The Federal Communications Commission auctioned off radio spectrum to the wireless carriers a big chunk of the "C" band of radio spectrum for about $80 billion in 2020. Rapport says the wireless carriers need more and more radio spectrum to carry more and more bits to our smart phones.