Can drive motor affect steering servo?

[WhiteWolf McBride]

I agree with the 'choke' idea, aka, a ferrite core.

You often see then on monitor power cables and the like, its that bulge in the data cord. You can get clip-on two-part ones, or simple ring-shaped ones, but feeding a servo cable to wrap it around the ring a few times may be hard. You may also want to run the power feeds to the drive motor thru a core as well... 2 or three wraps of the power line minimum.

Bit I agree, its probably a electrical/magnetic feedback issue. With a separate battery supply, there is less direct path for the feedback in the wiring. Thats why it spikes when the RPM is cranked.

WhiteWolf

[sparkycuda]

Tried the easier "fix" first and added a Radio Shack snap-on ferrite core choke on the steering servo lead. The servo uses a large, twisted wire bundle and could only install one bundle through it - not wrapped as discussed. Guess what? The truck steers perfectly now! Even moved the servo back to its original position - still good! Then I tried using the ESC-BEC instead of separate battery - not good - the servo dithers on its own, but not in relation to motor speed. So tomorrow I install the external BEC and we'll see if is okay.

Thanks to everyone for suggestions. Now to finish the cab mount and see about a video.

Ken

[WhiteWolf McBride]

Sparky,

Glad to see ya got it solved. Give us some pics if ya get the chaance, we may need to use thre thread to help others, and a good set of reference pics would be a benefit, eh?


WhiteWolf,
off to try for the first full night's sleep in a week...