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HomeAircraftHelicopterBeginners Corner › Heli servos question
11-01-2004 08:25 PM  13 years agoPost 1


North Carolina

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I have non digital servos and when I turn the heli RX and TX on the servo's jitter and make a slight noise. Is this normal ? or is there something going wrong with the RX ?

How does one get rid of the jitter / noise on the servos ?

many thanks

"Flying on the Edge of a New Frontier"

11-01-2004 08:59 PM  13 years agoPost 2


So. Daytona, FL

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Yes, its normal. The servos will jitter around the center point just a little. Better (more expensive) will center better and minimize the jitter.

About the only way to get rid of the noise is to turn the receiver off.

ALL servos do this to some extent; even the high range digitals make a good bit of noise.

The best you can do is to make sure the pushrod linkages and ball links are free and smooth with no binding, drag, or rough spots.


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11-02-2004 07:02 PM  13 years agoPost 3


Morgantown, WV

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I only have a handful of planks and heli's, but in every one of them, the analog servos are rock solid as long as the transmitter is on. The only time I've seen any movement or noise whatsoever, is when the linkage was binding. My digital TR servos jitter almost constantly, but not the analogs.

I'd suggest checking the linkages, all wire connections, crystal connections (maybe even a bad crystal), battery voltages and especially the Rx antenna routing. It should not be touching any metal or carbon fiber. Nor should it be running parallel to any metal or carbon tubes (ie, tied to tail booms or boom supports).

Also check for loose bolts and metal to metal connections anywhere on the aircraft. These will vibrate while the engine is running causing glitching.

Don't forget to check the Tx antenna to make sure that it's screwed in tight. I've seen them come loose on more than one occasion.

If none of these things show up as a problem, there is always the rare chance of interference on your frequency. If you have one available, you can try another channel receiver and transmitter.

Hope this helps. Good Luck.

11-03-2004 01:27 AM  13 years agoPost 4
zoom boy

rrKey Veteran

N.E. Lincolnshire UK

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if the servos are not binding then that means they are just trying to centre themselves, but you say you do not have digitals, hmmmm, with the exception of the tail servo thats very odd, you will get this all the time with the tail servo, because ANY small movement will make the gyro slightly move the tail servo, causing sound, could it be that that you are hearing

11-14-2004 08:33 AM  13 years agoPost 5
Jason WAI


Hong Kong

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it sounds normal ......perhaps you may check agian the linkage if there is binding . too much tention may be one cause

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