They didn't cut corners at all - that's the thing. The allocation of the spectrum is only for transmission, and the radar altimeters in question passed that sp

They didn't cut corners at all - that's the thing. The allocation of the spectrum is only for transmission, and the radar altimeters in question passed that spec. It says nothing about receive, and due to how radar altimeter works, it's much, much harder to filter out interfering signals from systems like 5G (5G in case of interference will just drop maximum data rate as it filters mismatched codes or incorrect checksums, radar altimeter might return incorrect altitude)