Reversing Y Cord Miracle-Y - Servo jitters, shakes, and chatters wildly

Hi, I had a similar problem with a Max products "Y" harness where one servo would deflect all the way one way, then all the way the other way and then center itself whenever the control stick was moved. Tryed it without the "Y" and it worked fine. Switched servos and the same leg of the "Y" acted up. Took the "Y" back to the hobby shop. they said the solder joint must have been bad. They replaced it and all was fine. Just try to get a replacement and see what happens. GL, Dan.

On 10/25/2003 5:16 PM Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge:

If the replacement doesn't work, physically reverse ONE of the servos (you will need a new push rod) and use a regular "Y" connector. I have this setup in a Gee Bee Y for the dual servos in the elevator.

Does it do it with other servos? If so, I would suspect a bad chip in the reverser. Most of these chips can handle up to 7-8 volts so I doubt that the voltage has anything to do with it.

Also, have you contacted MPI yet?

Check and see if you have used some of those 'inexpensive' extensions. Most of them DO NOT have gold on the connector and I have found that to be a major source of servo problems. What a challenge THAT one was!.

If he has the servo reversed now, and he switches to a regular Y and reverses the servo internally, why would he need a new pushrod?

Not with that product, but we had trouble with trainer cords made from the same company. The cables were intermittent, resulting in a complete loss of control from the student's box. (These were Futaba replacement cords)

Alan Harriman

David, My first MPI reversing Y cable had a bad connection to the little circuit board making one of the branches of the Y unreliable. Took it back and swapped it for another one - that solved the problem.

Ed

On 10/25/2003 11:19 PM Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge:

The length of that one rod will change because the center of the arm (where the arm connects to the servo) will either be closer or further away than it was before.