Changing Frequencies.....danger??

[F3AFlyer7 at comcast.net]

Well I've heard a couple of opinions on this so I figure I'd get some more. I need to get a new frequency for the NATS but don't want to send my transmitter in. I have a Futaba 9C. Some have told me that I can change as many frequencies as I want without mishap, while others have told me that you can only go 6 up or 6 down or else your transmit range gets shorter. Is this true for transmitters with crystals in them only, or for both crystal and module transmitters? If this is also true for module transmitters, then why are there synthesized modules for the 9C?

Thanks!

Scott
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