BEC/ESC

Hi all,
I have a hobby zone super cub, one of the newer BNF versions with real 3 wire servos. I replaced the combined esc/receiver with a turnigy 30A one and a spetkrum 6 channel rec. With ardupilot mega 2.012 installed it works well. However, when I plug in my xbee, I get twitching servos, especially in any non manual mode.

After reading other posts on this I thought it was a ppm issue. I bought a programmer and ran the batch file in the manual. This reduced the servo twitching, but I still get some in non manual modes. I am now wondering if it is the bec.

The esc has a built in 1A BEC. Is this likely to be enough for 2 servos and APM and XBee? I have found it very hard to get any info on just what is a satisfactory BEC size from searching the site. Should I consider a separate BEC?

This is a brushed ESC as the plane has a brushed motor, if that matters.

Regards
James

Tags: BEC

Views: 91

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3D RoboticsPermalink Reply by Chris Anderson on April 20, 2011 at 6:56am
A 1A BEC is small, but I don't think that's the cause of the twitching servos. It's probably RF noise from the cables going to your Xbee. Try routing them differently and see if that makes a difference.
Permalink Reply by Darren on April 20, 2011 at 2:15pm
as an experiment, touch the antenna of the xbee on the plane side, and see if the twitching stops...
Permalink Reply by James masterman on April 20, 2011 at 6:44pm

Darren, I tried touching the xbee antenna and the twitching stopped immediately. I assume that the cause of my problem is RF noise then?

 

Permalink Reply by Darren on April 20, 2011 at 9:14pm
Yes, seperate the xbee from your receiver as far apart as you can... also if you have multiple antennas on your receiver, make sure that the xbee is not in parallel to either of the receiver antennas

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