Buzzing Servos

[MicroMan]

Last night I thought Id power up the DX7 system and set up my servos, that was a piece of cake. My servos are buzzing indicating binding I assume, I double checked my links and they were done by the book so no problem there. I assume that I would go into the "Swashplate Mix" menu and adjust the servos from there or would I mess around with the "Travel Adjust" menu. My rudder servo is buzzing as well with no load (arms/links) on it, how do I remedy that.

[stevehonn]

Every 9254 servo I've owned has buzzed and the same with most other digital servos, because they centre so well even the tiniest bit of drag will cause it, even the weight of the blades on the links. It seems pretty normal to me.

[MicroMan]

Really I think its pretty annoying, I come from the old school of when your servos buzzes theres binding.

[DeadTom]

MicroMan
I agree that there must be something loading the servo so it is getting some type of mechanical feedback. I have experienced the same type of reaction with my airplanes over the years.
DT

[Danal Estes]

Digitals will buzz a bit. Grab the arm and try to move it... that's a true "there's a bind" buzz. Let it go... that more subtle buzzing is just how digitals behave.

Don't mess with your travel or swash or whatever you said in the first post (unless there is some other reason to adjust).

[MicroMan]

Well it looks like the buzzing isnt coming from the servos after all, the noise is coming from the AR7000. Whenever a slight load was placed on a servo the AR7000 would buzz like a hive of bees.

Of course when the servo linkage was remove from the swash there no buzzing.

I have to admit that Im running a non-conventional (IMHO) power setup for testing purposes. I have a 4 Cell AA Dry Cell case with alkaline batteries into the harness which goes into the Rx.

Does anyone think that this setup is a bit under powered to drive 4 digital servos and causing the feedback into the AR7000. Maybe Im grasping at straws but its the only thing that I have to grasp at right now.

[stevehonn]

I'm not sure about the feedback but 4 AA dry cell batteries are certainly not up to the job.

[DavidH]

I'm not sure about the feedback but 4 AA dry cell batteries are certainly not up to the job.


Can you explain why you think that?


David

[MicroMan]

Well this is prob going to get interesting, I called Horizon and they told me to send in my AR7000. :(

[stevehonn]

I'm not sure about the feedback but 4 AA dry cell batteries are certainly not up to the job.


Can you explain why you think that?


David

What sort of current output would you get from 4 AA alkaline cells?

[DavidH]

You would get plenty of current. I have used 4 AA Alkaline batteries in a dry cell holder to set up a model and test fly it. Lots of the RC car racers that is all they use to power the electronics on there models is 4 AA dry cells.
Alkalines are 1.5 volts, so it is putting 6 volts to the electronics. Not a problem.

Just because they are not rechargable and not nicad or nimh doesn't mean they won't do the job.

Alkalines was the only way to power electronics in models not that long ago.

[stevehonn]

I stand corrected, I'm obviously confusing capacity with output current.

I do know that i've had problems in the past with 4 cell AA nimh packs dropping voltage under load very quickly, despite being 2400mah capacity.