i have a 4 channel heli 2 futaba 8 channel rxs a 6 channel tx.i cant figure out how or what cristals will work with them.can someone advise?i have several cristals the futaba rx says high band on one and nothing on other they are FP-R138dp dual conversion.the tx is a old 6 channel futaba. i have these cristals 72.110 dual conversion rx 16 bottom of rx says 16 72.110 mhz the tx has a 16 72.110 gws cristal.i get nothing also i have alot that says stuff like type 72-4b fm rx or 72-6 fm tx also type 72-4 fm on back says 72.790 have tried matching them up with nothing so far

remember you must change the transmitter from ppm to pcm to use that receiver,after you have changed it you have to switch off then back on again to implement the change. its only the receiver that needs the dual conversion crystal,the tx uses the standard tx crystal

henry