Comment This is more about the receiver in the Altimeters (Score 1) 127
5G and Radar Altimeters are on adjacent bands. The issue is the altimeter receiver RF filter, basically it isn't narrow enough.
I don't remember the frequencies off the top of my head, but it's like transmitting on 2.4GHz and listening for replies on 2.3-2.5GHz.
Aviation has been through things like this years before like when they tightened down the voice channels.
But the whole world saw this coming and the FAA should have made them fix this over a multi year period (like they are now).