Lynn,

That is odd since the M5 is a "full strength" dual conversion receiver. I have 2 of them and haven't seen any problems with my Futaba Super 8 transmitter.

Perhaps the planes that you had the M5 receiver in had noise from the power system. Since you had issues with 2 of the M5 receivers, I can see why you may question the transmitter.

Both companys, FMA Direct and Hitec, will take their products back for a re-calibration or testing. You may want to consider this during the Winter months.

Another idea is to have a friend try an M5 on his transmitter. This may help you to decide which component is giving you problems.

Good luck!

P.S. I'm moving this thread to the General forum.