In "aviation time", they turned up yesterday. Allocations everywhere else either are further away from radar altimeter frequencies, or follow similar mitigation

In "aviation time", they turned up yesterday. Allocations everywhere else either are further away from radar altimeter frequencies, or follow similar mitigations to those proposed by FAA... for the very reason that aviation world was involved from the get go. But FCC selling allocation all the way to 3.98GHz with no mitigations happened very recently, while there are still worries (that are being verified) that 400MHz guard band might be not enough in case of transmitter failure.