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Europa-List: RFI of Trim Indicator

Subject: Europa-List: RFI of Trim Indicator
From: irampil@notes.cc.sunysb.edu
Date: Tue, 14 Jun 2005 09:31:22
 06/14/2005 09:31:24 AM,
        Serialize complete at 06/14/2005 09:31:24 AM


Hi All,

I occassionally see this RFI effect as well.
Nev may be correct that there is some coupling between
the parallel runs of coax and trim cable to the aft of the plane.
Then again, most Europas have their vertically oriented COM Antenna
just a few cm from the Trim Motor which may be more likely.

The basic problem however is that the supplied trim indicator module
itself is not protected from VHF transmitters which is a problem,
given that the MAC systems are expressly designed for the aviation
environment.  They need more bypass capacitors in the module and maybe
some ferrites on  the leads.  I'd call Ray Allen to complain, not Europa 
2004

Ira N224XS



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