Originally Posted by heinduplessis
I've tried 2 different HXT900's a TowerPro 9g and some unbranded orange and blue digital servo from HK. Proximity of the RC TX makes no difference.
Maybe I should invest in more expensive servos.
Many have good results with this servo> http://www.pololu.com/catalog/product/522
Digital servos always "buzz" they also tend to like the higher voltage, 6V. You will also find that some servos are affected by RFI from the VTx. Hitec are pretty immune from this noise and are a good "safe bet" choice. Search the forum for susceptibility to RF noise and you should find some studies.