So I tried to write some 440 freq's to my XPR6550 and i got a message that due to the 2013 narrowband mandate, only 12.5 KHz channels are allowed to be written. 440 is 25KHz standard as far as I know. So i had to make my 440 12.5KHz. The Pro Series CPS is the same way. Its like January 1, 2013 opened up a big can of worms.