rx ... check
servos... check
tx... check

so in other words you have something else interfering pretty strongly on channel 16. try a new frequency, preferably at the other end of the spectrum. (well, probably not higher than 34 or so, might have to have the tx/rx retuned if you go to high band... come to think of it, have you had luck with this setup on low band stuff before? maybe it is already tuned high...)