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Old Feb 07, 2013, 05:07 AM
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Joined Feb 2013
37 Posts
Servo Noise?


Just wanted to ask another noob question.

When I power up my Trex 450 I keep hearing a noise that comes from the tail servo, it is the only thing that continuously makes a noise even if the heli is completely still.

Is this normal?

Thanks I really appreciate the help.
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Old Feb 07, 2013, 07:05 AM
Mixmasta belongum jeezus kraes
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Australia, New South Wales, Sydney
Joined Jan 2011
2,781 Posts
If it's a digital servo, the noise you're hearing is probably normal. The frequency of the noise is the circuitry's "sampling" rate - how often the servo readjusts its position.

Sometimes the deadband (zone where the servo is willing to say "near enough is good enough") is too narrow, and the servo keeps "hunting" around a central happy spot which is too small for it to hit reliably. A servo programming device can sometimes be used to modify a few operational parameters, including deadband width, but it's usually not worth the effort for most people in most scenarios.

Otherwise, if it's an analog servo, it might just be a case of the jitters. A dirty potentiometer or just simply "budget" components are usually to blame in that case.
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Old Feb 07, 2013, 07:33 AM
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Thank you so much for your time.

As far as I know they are digital servos. Thanks for taking the time to explain to me and perhaps other the details behind the noise.

thanks once again.
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Old Feb 07, 2013, 02:06 PM
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good australian site for heli 's
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