Message-ID: <002001c090e0$04e27d40$02888ec6@user>
From: "Robert Overmars" <rovermars@optusnet.com.au>
To: "lancair list" <lancair.list@olsusa.com>
Subject: rf interference
Date: Wed, 7 Feb 2001 18:28:57 +1000
Reply-To: lancair.list@olsusa.com
Mime-Version: 1.0

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I suggest to anyone who is running wiring in the aft fuselage of a IV, such
as trims and rear position light, to loom and screen these wires. We have an
interesting little problem in that when transmitting on some frequencies the
rudder and elevator trim indicators (Mac trim LEDs) will dim and change and
light up multiple LEDs. I suspect strong rf interference is the culprit as
these wires travel aft close to the com antenna. The flap position indicator
and hydraulic pressure indicator which use similar but not identical LED
indicators are unaffected, their respective wiring circuits aren't anywhere
near the com antenna of course.
The rear position light probably should have it's feed and return wires
screened  as it travels aft past the antenna as well and is probably feeding
rf back into the ship's wiring. This is probably why the Electronics
International fuel guage changes readings when transmitting on some
frequencies, another little problem to sort!
Regards,  Robert Overmars.
Taree, Australia.


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