Just some little info after some tests and more to come .
we tested the digital servo's with the analogue Am system's and came across alot of glitching that was with 27mhz and 29mhz.so we dont recommend digital servo's on anologue AM systems
we also tested with Fm systems 29mhz,40mhz and 75mhz with the digitals servo's and found no problem with glitching but the servo's did lack a little performance.
Then we tried analogue servo's on a 2.4ghz digital system and had no issues a little less performance but to be honest you need to be the super eye to pick it up .
The digital servo's on the 2.4ghz system were fast and alot of torque but in saying that if you were to buy a 6kg digital for so dollars but you could buy a 13kg analogue you wouldnt be able to pick the difference so why spend the money when you dont have to .
Now i tried something like they try on the American show mythbusters were some say that you cannot use a digital servo and an analogue servo on a digital system .
so we tried connecting a analogue servo to channel 2 and digital to channel 1
we had no problems at all with response and no interference .But when we tried to connect a digital and anaolgue servo with a y connector through the same channel yes then we had major problems with interference and glitching mama mia what a headache .so we found that on a digital system the tx processors data seperatetly to each channel so the two types on the y connector were confusing the feedback sigal back to the tx from the rx causing us the headache .but when we split the analogue and digital servo to the different channels things went back to normal .
so i decided to plug in two analogues and two digitals through the Y connector just to make sure i wasn't doing anything wrong and no i was right two digital on the same channel worked well like the analogues on the other channel worked well as well .so i was happy .
The radio's we used was a M11 sanwa ,dx3s and the analogues were the futaba MJ,futaba 3-pm fm.
servos used ace,sanwa,mks,cobra,futaba
Ill keep you posted on more tests .
please if anyone else has done some testing please post so we can all read and learn .