StarLite control glitches

[art]

StarLite model has MX-6800 Micro receiver, JMP9 controler, and DC5-2.4 motor. During 3 test flights four control glitches occured for a fraction of a second. Two were left rudder, one elevator down, and one power off. These were serious enough to require landing to check the model, with no result. There were other flyers on the field with no such problem. With model in the car trunk and the transmitter on, the motor power went on for a fraction of a second, without touching the TX. TX is Hitec Focus 4, FM.

The model flew great, except for the control glitches.

Anyone have possible source of problem or fix?

Art

[ksblaze]

The only glitching I've encountered that wasn't due to low batteries or known interference happened with the Rx antenna too close to an aluminum tailboom. Moving it at least 6" away fixed the problem. This was with a dual conversion FM Rx.

Karl

[art]

Hi Karl,
After first two glitches I moved antenna away from carbon control rods with wire ends. Got more glitches. What does dual conversion mean for a Rx?
Thanks for your reply.

Art

[ksblaze]

Hi Art, I'm not an electronics whiz, but dual conversion has something to do with signal decoding or amplification. Single conversion receivers are lighter but cannot operate at the same range as dual conversion.

I'm not up on the problems of 3rd order interference, which can be a problem at busy fields. If you get the same glitches away from the field then it's likely something else. The symptoms sound like what happens when the transmitter signal is lost. My servos will jerk askew when I turn off my transmitter, though my ESC won't let the motor turn if a signal is lost. I'd check for any type of loose connection on board, check the receiver connection area for cracked wires, test the RX antenna for continuity between it's end and the RX circuit board, make sure the TX antenna is tightly attached.

Lots of possible problems, just try to test one at a time, or you may fix it without knowing what did the trick. I was going nuts trying to find out why my ESC wasn't working properly when plugged into the BAT/ch. 4 socket on my RX, till I read up and discovered that ch. 3 is the throttle. Lots of lost hair over that one.

Good luck!

[sandymorton]

Art,
In building my StarLITE I used 4 pound monofiliment fish line for a pull-pull system for the rudder/elevator , thus I have no metal aft of the servos [HS-55's]except for two 1/8th inch lengths of pins used in adjusting the system, located at the two horns in the tail assy. I have had NO glitches whatsoever.

You might look up in the master index for the magazine on a pull-pull system that uses a 2-56 screw in the arm of the servo. The ideas was a good one- and the one I used as described above.

Good luck.

Sandy