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the noise is not from the transmitter
errm, white noise just exists plain and simple.any radio channel that isnt tranmitted over will be in a state of white noise, what happens is that when the receiver is on and the transmitter is off, the receiver is always picking up white noise. Because it is random it will invariably create the correct sequence of an ascii character from time to time at a range of all possible baud rates. When the transmitter is on, the power of its sending must be strong enough to overpower the white noise, this isnt usually a problem tho.. and even if it was, some kind of double or triple sending or ping pong sending will usually filter the noise out.