After spending 30 mins trying to figure out where the interference was coming from, I put the trusty 46FX back in, did a ground check and radio check, then flew it the rest of the day. The only thing that changed was the engine. That is why I am scratching my head.

Also, before someone asks why I was doing this, I wanted to break in the 46AX and leave it on the Ultra Stick. The fuel line is easier to access on the AX than it is on the FX, plus then I could put the FX on the Spacewalker2. The Spacewalker has a cowling, so I installed a fuel dot for refueling.