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| FAA Statement on 5G |
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| rstofer:
--- Quote from: Foxxz on December 17, 2021, 01:24:26 am ---I get there can be out of band harmonics and whatnot but there are acceptable emission standards for that and your receiver should be prepared to cope with it. --- End quote --- So, 80+ years ago, when radar altimeters roamed the earth, there were no neighbors and 5G wasn't even a dream. So, you design a system for the facts in front of you and, now, decades later, with thousands of installed units, designed for the facts in front of the designer at the time, somebody moves in next door, It seems to me that this is 100% FCC responsibility and 0% designers/users of radar altimeters. The FCC got greedy selling spectrum which meant exactly what to the average taxpayer, airline passenger or cell phone user? Not a darn thing! The radar altimeter was designed in 1924 and commercialized by Bell Labs in 1938. Kind of a long time before cell phones were even a dream much less a nightmare. I don't know when the altimeters started using 4.2 GHz. https://www.freeflightsystems.com/blog/product/radar-altimeters/ Interesting paper: https://www.icao.int/safety/FSMP/MeetingDocs/FSMP%20WG11/IP/FSMP-WG11-IP08_ICAO%20Flight%20Operations%20Panel%20and%20IATA%20%20IFALPA%205G%20problem%20statement.pdf |
| Marco:
Can't let antiquated and badly designed equipment tie up spectrum forever. A sanely designed system with cross correlation and a semi-random sequence should be able to deal with any interference which doesn't saturate the front end, even bad filtering shouldn't really matter. Of course assuming sanity is not realistic, so a lot of equipment will have to get swapped out ... but the decision for the sale was made in 2018. That's more than enough time to replace the antiquated and bad equipment. |
| tooki:
Yep. What I still don’t understand is why the OP seems to be placing blame on the FAA. |
| Ed.Kloonk:
--- Quote from: tom66 on December 17, 2021, 05:37:50 pm ---Same problem happened in the UK with Freeview TV and 4G signals at 800MHz. Older receivers weren't immune from the near frequency, so the cell providers had to pay for 200k+ filters for people, plus engineers to install them if you didn't know how to unplug an antenna and plug in one of these dongles. :-DD --- End quote --- I've watched the allocation of spectrum here over the years and studied some of the history. The problems, I think, stem from who gets to sell bandwidth on behalf of everyone else and what happens to the income received from the highest bidder. |
| SiliconWizard:
--- Quote from: rstofer on December 18, 2021, 06:37:00 pm ---It seems to me that this is 100% FCC responsibility and 0% designers/users of radar altimeters. The FCC got greedy selling spectrum which meant exactly what to the average taxpayer, airline passenger or cell phone user? Not a darn thing! --- End quote --- Yep. And again, whatever the situation, this is FCC's duty to make sure frequency allocation will be safe for existing installations, especially when it comes to safety-critical ones. Does anyone (except a few apparently) here know how long and how complicated it is to get avionics/air navigation systems certified? How could the FCC ignore that? It sure came under a lot of pressure, seeing how so many large telecom companies and governments were so eager to deploy 5G. But when you're responsible, you are supposed to handle pressure properly. Oh, and 6G is coming too. It's going to be a lot of fun. Not saying that the FAA has 0 responsibility in this either, at least considering that it seems to have been a bit too "careless" these days... |
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