Transmitter Wiring Check(!)
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[Courtesy of Martin Brungard, mabrungard "at", February 2001]

Through recent experience, I can forward you some insight on the wiring to the potentiometers on Visions and probably many other transmitters in use today.

With the gimbals in our radios, one of the pots is probably mounted within the gimbal system and it and its wiring harness moves everytime you move each stick. With nice pliable insulation on the wiring harness, there shouldn't be any problems with this setup.

I have had my trusty Vision for over 11 years and weekend before last, I started getting some odd behavior at the flying field. I initially attributed it to my 'hammer-bait' Tetra reciever, so I slated that reciever for replacement with one of my others brands. I did that this weekend and found that the receiver was not the problem. I assumed that a dirty pot was the problem. Upon opening up the tranny, I found that one of the three wires in the aileron pot harness was partially cracked and the wire was making intermittent contact. The insulation was hard and unpliable. Because this and the rudder pots move with the gimbal system, the wiring is subjected to repeated movement that ultimately severed the wiring when the insulation hardened.

In the case of the Vision, the rudder would intermittantly go to one full-lock position or remain neutral when the stick was moved (the rudder was plugged into the aileron channel on this plane). When I reviewed the aileron signal output on the Vision's computer screen, the output would intermittantly read the neutral value (about 125) or the max value (255). I guess the actual behavior would depend on which wire that broke.

I expect that the flap or elevator wiring will be much less prone to failure since they do not move as much as the rudder and aileron pots. I suggest that anyone with transmitters that have several years on them, review the pliability of the wiring to these pots to see if they are becoming brittle.

The wiring installation has a nice big loop of wire in it, so that this harness isn't strained. But, the repeated bending of the rigid insulation finally did it in.

I intend to replace these short wiring runs on these high movement pots with some fresh wiring so that I won't have this same problem with one of the other wires. You may want to review your old faithful tranny to see if you need to do the same.

Martin Brungard Tallahassee, FL

"Meandering to a different drummer"


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