Hello, I'd like to know if there is anyone out there who knows how to stop servo interference? I have a JR XP642 with brandnew JR flightpack with 537s in my hawk and never had a problem for 4 yrs until now. As soon as I turn the Rx on all of the servos start moving uncontrollably and intermitting. I also have a nexus with Jr 517s and 1 hitec 605 on the rudder that does the same thing when I turn the Rx on. I know about pcm and fm but I've never had any interference ever before but now all of the sudden.

You first need to locate the source of the interfearance. Try your radio on another helicopter, swap around the RX's, the start un plugging servos. From what you posted it sounds more like the radio is having a prblem, if it worked before, and now it is affecting both of your setups.