Greetings,
I am a fairly new owner of a RA25 as well. Unfortunately I don't know anything about the NC feature, so I will be monitoring the responses to see if there is something I may have overlooked in my programming. My question is why are you manually programming? My RA25 came with the programming cable, and the software is a free download. The software isn't a friendly as CHIRP, but it does work and it make downloading new programming to the radio take less than a minute.
Eric