REFLECTOR: Transponder Location and Ground Plane

[Alex Balic]

I fabricated an 8" dia circle from aluminum, mounted that to the bottom
of the battery tray, and the pre-fab (spruce) antenna goes through the
center of that  this arrangement requires stand-offs for the battery
though.
 
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Bob Jackson
Sent: Tuesday, June 21, 2005 8:23 PM
To: Velocity Aircraft Owners and Builders List
Cc: Bob Jackson (Home)
Subject: REFLECTOR: Transponder Location and Ground Plane
 
We want to fly our Velocity in the flight levels and will need better
than normal transponder operation and range up there.  Is there a
consensus on the best place to put the transponder antenna, and also
whether or not it's better to use a blade that's outside the hull, or if
the internal one suffers no lose?  We have a lot of carbon fiber in
various places around our hull and are a little concerned about masking
the transponder antenna, and are therefore thinking it may be best to
use a protruding external blade antenna.
 
For those using the internal antenna, are you mounting it oriented down
with some kind of arrangement so that there's a ground plane above it?
How big of a ground plane are you using?  Where are you putting it?
 
Sorry if I'm covering old ground,
Thanks for the help,
Bob Jackson
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