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Electric motors - such as the flap and autopilot - can send high-frequency
noise back up their power supply lines and onto your avionics buss.

I fixed a similar problem once where the MT prop servos were introducing
noise into a StormScope. You can determine whether the problem is
power-buss related by connecting your autopilot system (or flap motor) to a
separate battery, not on the avionics buss. If the problem goes away, then
you know where the noise is coming from and how it is getting to your
avionics.

If the power wiring turns out to be the problem, take the positive lead to
your S-Tec (or flap motor) and wind it about ten or twenty times around a
ferrite "donut". This will stop most of the noise - at least it did for me.
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Please send your photos and drawings to marvkaye@olsusa.com.
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