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Date: Thu, 09 Oct 2008 09:47:14 -0400
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From: Micah Froese <micah@froese.com>
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Subject: Re:Small Tail Incidence Data & Transponder Problems
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Wayne,

I would suggest you put a ground plane behind the antenna, and tie it in 
with the airplane ground.  Had this problem once on a Mooney with an 
STC'ed one piece fiberglass belly pan.  Ground plane doesn't need to be 
big, 12 - 14 inches in diameter should do.  I used some copper mesh that 
I had handy, but a thin sheet of aluminum should also do.

Micah Froese
Lancair Legacy
300 hours
down for paint

Subject:
Small Tail Incidence Data & Transponder Problems
From:
Wayne Bailey <waynnno@yahoo.com>
Date:
Wed, 08 Oct 2008 18:46:39 -0400

To:
lml@lancaironline.net


Also,  having intermittent transponder problem.  Seems to always have 
problems with SOCAL in LA basin,  but other radar 
environments sometimes have a problem sometimes not.  Go figure.  I have 
reply light flashing but they can't see me - other times no reply 
light.  Tried cycling etc.
 
Current transponder is a King KT76C.  Internal antenna.  Don't know 
about required matching transformer yet. 
 
Going into the shop this morning for trxpd checks.  Plan to check 
frequency and power and check for matching transformer.  But my mechanic 
says that he has had very limited / no success with "internal" antenna 
on other composites.
 
Any list experience with internal antenna? Any suggestions on where 
internal antenna might be located?
 
Thanks a lot.  Really appreciate help from the list.
 
Purchased AC last spring,  but haven't flown it much due to taking it 
out of CA to avoid the sales tax (9.5%  !!!).  Plan to start flying a 
lot more and resolving these issues.
 
Wayne Bailey
310-567-6877
 
N10RD
LNC2
360