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A comment on U.S. FAA clears 45% of commercial plane fleet after 5G deployed. Parent comment
* 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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* 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.