I have a remark. I've used in my Kangaroo no digital servo's, only ferrite-rings. A clubmember also built a Kangaroo with the same installation as mine but he used digital servo's. From the first flight he had radio-interference. Than he bought a emcotec (another 200 euro's)and his the interference was away. I've now 40 flights on mine with no problems at all.

Maybe someone else also experienced this problem...