Originally Posted by 05forfun
My motor has capacitors go with it, but the servos are cheap, one is futaba 3003 another is cirrus, cirrus servo has metal gears but both interfere the motor. I felt that 3003 has less effect than cirrus. So is there any way to cure this problem?
Cirrus gets the thumbs down from me. I do not rate the quality at all and have seen them cause problems in the past.
Futaba 3003 should be a reliable servo.
Assuming all your radio gear is in good condition (no broken antennas, good battery power, crystals cared for, tidy wiring) it is really hard to diagnose radio problems unless you do a swap-by-swap test until you get a known good setup.