U.S. FAA clears 45% of commercial plane fleet after 5G deployed

Re:U.S. FAA clears 45% of commercial plane fleet after 5G de... by DannyBee on Tuesday January 18, 2022 @11:02AM (#29981113)

200 is already crazy large. Super crazy. The original request from Boeing was only 100

These altimeters are dangerously defective if they need a 400mhz guard band. That is nuts

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Re:U.S. FAA clears 45% of commercial plane fleet after 5G de... by indrora on Tuesday January 18, 2022 @06:06PM (#29987438)

you're actually looking at the intersection of three problems:

* LTE is very noisy (it has echos in its sidebands for up to 100Mhz)

* low-frequency LTE is *loud* -- punch through mountains loud.

* These altimiters are doing the RF equivalent of looking for a needle in a haystream

While FCC Part15 says "accept any/produce as little as possible", much of this comes down to the physics of RF.

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