The testing and approval process has dragged on for this, but we believe that yes, existing 450m and 450b radios will be approved for RSS-198, and be allowed in 3900-3980. They will operate in nearly the same way, and suffer very little degradation. (Note: Regarding the 450m, I am talking ONLY about the model that ends in “B”… there were hardware changes that allow much better performance in this spectrum.)
I expect the testing to be complete by the end of Q1, 2024.