lml@lancaironline.net Mailing List Archive

Chris, I had the same problem in my Glasair and thought that it was something that I did. I told the avionics guys that installed the Trutrac auto pilot and they said that I was crazy, but it kept on happening, but not all the time that I used the com. They eventually installed a separate button on the panel and that I use to talk to the ATC, instead of the mic switch on the joy stick. That seems to have corrected the problem, at least on my Glasair.

Michael n66mg

In a message dated 3/4/2009 5:14:21 A.M. Pacific Standard Time, steve@oasissolutions.com writes:

I used this and it helped: http://www.vonero.com/index.php?/showproduct/853439

Steve Richard

Chris Zavatson wrote:

A recent upgrade to more powerful com radios has introduced a bit of an undesirable problem with the Trutrak autopilot. When the auto pilot is engaged and the #2 radio is keyed, serious pitch oscillations occur. While the Trutrak installation materials discuss its relative immunity to RF, it does suggest shielding the lines to the control wheel steering switch. if interference is encountered. The radio upgrade included switching from RG58 to RG142, so the overall shielding is improved, however, the antenna for the #2 radio is much closer to the autopilot wiring and hardware than the #1 antenna. The interference appears to be be coming directly off the comm antenna and not from any 'leaks' on the way there.

Are there any tried and true fixes for making the Trutrak immune to RF? I really didn't want to re-invent the wheel on this one.

Chris Zavatson

N91CZ

L360std

www.N91CZ.com

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