Yaw problems in MP radio set up

Hi all,

I'm reposting this discussion hoping to get a response.  I uploaded 2.5.5 after erasing eeprom on APM2, and when I went to the radio calibration screen, the Yaw "bar" value was at 1640 (off center to the right) without any inputs from my TX. When I pushed my yaw stick all the way left and right, the low value was 1257 and high was 1865 (the trims on my TX are all centered and endpoints are set at -100% and +100%).  With these values I was unable to arm APM by pushing yaw all the way right.  I had to reset the TX endpoints on channel 4 to -125% and +125%, and now I was able to arm my motors, but the hexa aggressively yaws counterclockwise.  I pushed my yaw trim on my TX all the way right to keep the hexa still, but all of this is quite unnecessary and irritating to say the least.  Is this a problem in the 2.5.5 code or am I missing something?  Please advise. Thanks.

James.

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ModeratorPermalink Reply by Dean Wynton on June 7, 2012 at 2:05pm

Hi James, as I said in the last post I have 1260 to 1800 and have no problems? I would recommend setting all endpoints to 100% and then re-calibrate in mission planner, even if the values were 1400 to 1500 this would be accounted for? If you follow these instructions you will probably find it works fine? If it doesn`t we will have to look into it a bit deeper? Let me know how you get on?

Permalink Reply by Michael Pursifull on June 7, 2012 at 3:10pm
And never trim yaw
Permalink Reply by Michael Pursifull on June 7, 2012 at 3:13pm
Please post your params file
Permalink Reply by James Dinh on June 7, 2012 at 4:44pm

Thanks,

I've got to get going to work now, but will post my params file tonight.  Not sure how to do that but I'll find out later.

James

Permalink Reply by James Dinh on June 13, 2012 at 7:58pm

It turns out that the problem was with my Futaba TX.  I tested the RX not connected to APM board and found the same issues with channel 3 and 4 mixing, so it's not APM.  After some more tests found that it was not the RX.  So now after calling Futaba customer support, they will take back the TX for repairs :)

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