Sanwa M11x 2.4ghz Radio Range Issues over ... The Hitec servos "could" be an issue, and again, uplug them.hitec S type digital servo into the old airtronics(sanwa) receiver this will blow up the servo circuits". My problem is that my receiver .
But your main problem is fit... the ports on the Sanwas Rx is tighter. Try dremeling or filing the Servo and ESC F-plugs on all four sides till .