Rob,
As i said on the other thread i've percivered with the etronix
I had the later Etronix fhss setup with 3 blue receivers and tried every option to get round problems
Its definatley an issue with the radio gear as i tried:
3 different speedos
5 different motors
4 different vehicles
3 different servos
2 different power caps
earth strap in cars
different batteries
I also had a number of replacement tx and rx's from cml still eventually causing me problems
Now i'm sure that there is a link to the knocks and bangs the receivers take in off road vehicles as i had the least amount of problems with the one fitted in my touring car
Now i have rock steady control with a 2nd hand £120 Futaba 3GR 2.4 Fasst and glad i made the change!!!