both tx's work fine with every other receiver. i've never had an issue until these two.
i did some research and found some dealer that said they aren't compatible with a 9z if you're using the synth module. i don't know if that's true or not, but so far, he's right
as for the other one, i don't know why it won't work.
as far as the crystals... that one i don't know. i don't know if they're hitec or not. i bought them as a flight pack from tower and had the xtal included. i can only assume they sent me what should have been the correct crystal. but on the xtal label i can't tell what it is. it's just got a channel # and freq. i can't see anywhere where it tells me a brand or if it's single or dual conversion. does it need to be specifically made by hitec?