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Reserving one frequency for Part 15 cannot include all users.
In my area there is a 5 kW station at 1600, which rules out 1610.
On 1650 I get either KCNZ Cedar Falls, Iowa, or KFSW Fort Smith, Arkansas, depending on whether it’s day or night.
Every X band frequency has activity at some places in the U.S., with the exception of 1710.
But even with 1710 you would have a problem if nearby users also wanted to run Part 15.