Well the whole point is they didn't have permission to use that spectrum. The interference the FAA is complaining about is explicitly outside of the radalt allo

Well the whole point is they didn't have permission to use that spectrum. The interference the FAA is complaining about is explicitly outside of the radalt allocated spectrum. FCC has allocated radalt's 200Mhz, with another 200Mhz guard on either side. If these devices are not properly filtering out frequencies outside of this massive 600Mhz range, those devices are faulty and should never have been certified by the FAA in the first place. It's reasonable for the FCC to assume that spectrum users will not be affected by interference from so far outside their allocation.