i,ve done some more tests on the model with these sus DS-821 servos, re- positioned the aeriel wire which sort of made some very slight difference to the better, re charged and tested the rx battery pack under load all good . now another question; when i am close to the model there is no chattering of servos but as soon as i walk away with the transmitter antenna colapsed i get to about 15 feet away and they start the chatters but if i raise the antenna abit all is fine again. when doing a range check with antenna down i get a good 100 feet and with the antenna right up i get more than enough range, what i feel is the radio could have some sort of close range problem when the antenna is down but when its up all does seen OK i did also plug in 2 non digital serovs to the aileron plug and they didn,t chatter only a slight hum which did sound normal. any ideas guys ?