I currently use an Etronix FHSS radio with these receivers and don't have any problems with binding:
http://www.hobbyking.co.uk/hobbyking...y_3XS_TX_.html
Im thinking of upgrading to this FHSS radio due to it's excellent reviews:
http://www.amazon.co.uk/JMT-RadioLin.../dp/B00EKG82EQ
My question is, will my existing 3ch Hobbyking receivers work with the new radio? Both are FHSS but I wasn't sure whether a 3ch RX was compatible with a 4ch TX - is it simply a case that I won't be able to use ch4?