3 ms·

But the FAA don't set the noise tolerance limit, the FCC do. And so far, despite weeks of work, no one has shown anyone is breaking the noise generation limit.

But the FAA don't set the noise tolerance limit, the FCC do. And so far, despite weeks of work, no one has shown anyone is breaking the noise generation limit. What confuses me here is exactly the FAAs safety requirements: they've said there could be a problem. But they've also not done any research to assess it. And they're not grinding any planes. So they apparently aren't that bothered by safety!?

p_l 5y ago
Noise tolerance limits for SOHO gear or telcos are completely different to requirements on FMCW radar transmitting a signal across all of 200MHz band... There is ongoing body of work, done internationally, for several years now. They aren't grounding planes because there's no operational need to right now - worst case expect a lot of canceled flights and maybe Southwest going bust as their scheduling flaps too much (also, USA is a bit lucky in having lower need for Category II or worse approaches than some other countries). And as someone else mentioned in comments, there are already issues cropping up with malfunctioning 5G transmitters despite 400MHz guard bands...
theYipster 5y ago
Your confused perhaps because your assertion about research done to assess the problem is wrong. Here is the industry research, presented two years ago: https://www.rtca.org/wp-content/uploads/2020/10/SC-239-5G-Interference-Assessment-Report_274-20-PMC-2073_accepted_changes.pdf https://www.rtca.org/wp-content/uploads/2020/10/SC-239-5G-In... Note the telco industry have attacked and politicized the research, but they have not offered up their own data to back up their claims. The aviation industry is on much stronger ground here. And as another commenter put it so eloquently, the aviation industry assumes something is dangerous until proven safe, not that something is safe until proven dangerous.

p_l 5y ago

Noise tolerance limits for SOHO gear or telcos are completely different to requirements on FMCW radar transmitting a signal across all of 200MHz band... There is ongoing body of work, done internationally, for several years now. They aren't grounding planes because there's no operational need to right now - worst case expect a lot of canceled flights and maybe Southwest going bust as their scheduling flaps too much (also, USA is a bit lucky in having lower need for Category II or worse approaches than some other countries). And as someone else mentioned in comments, there are already issues cropping up with malfunctioning 5G transmitters despite 400MHz guard bands...

theYipster 5y ago

Your confused perhaps because your assertion about research done to assess the problem is wrong. Here is the industry research, presented two years ago: https://www.rtca.org/wp-content/uploads/2020/10/SC-239-5G-Interference-Assessment-Report_274-20-PMC-2073_accepted_changes.pdf https://www.rtca.org/wp-content/uploads/2020/10/SC-239-5G-In... Note the telco industry have attacked and politicized the research, but they have not offered up their own data to back up their claims. The aviation industry is on much stronger ground here. And as another commenter put it so eloquently, the aviation industry assumes something is dangerous until proven safe, not that something is safe until proven dangerous.