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Date: Sun, 12 Jun 2005 12:17:42 -0400
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From: "Gary Casey" <glcasey@adelphia.net>
Subject: Re:  S-Tec Autopilots/KX155 Radios
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<<Talking with a S-Tec tech rep at Sun-N-Fun,  he said the Altitude
Transducers are very easily influenced by RF, He said to separate the radio
and transducer cables where you can and wrap the transducer in Aluminum Foil
and ground the foil to the cable ground mesh/wire..
Don Skeele  2235/320>>

There is a way around this - Use a Chrysler MAP sensor.  It makes a
difference which one and I don't have the part number handy, but I can get
it if you like.  The sensor has a different pressure port, different
connector and a different mounting, but that's all small stuff for us
experimental types.  The Chrysler sensor has a different calibration curve,
but that doesn't seem to bother the S-TEC system at all.  It is much more
resistant to EMI and RFI and it will run on the 9 volts that the system
requires.  Most 5-volt devices won't do that.  I've been using one in my
Cessna for a few years with no problems.

Gary Casey