Groundplane for transponder

Jan,

You did not state why you need to construct a ground plane. Is your
plane composite? In that case you could get a half wave antenna from
Spruce and not worry about a ground plane. Its only about 5.5" long
- but a bit pricier.

-----------------------------------------------------------
Paul Lee, SQ2000 canard project: http://www.abri.com/sq2000

"Mads" wrote in message ...
Anyone with depth knowledge of groundplanes for transponders?

- their mission (any theory would be appreciated)?
- required dimension
- required shape (is a cross OK or does it have to circular)
- material (is aluminium tape OK?)
- installation - follow the a/c body, or flat
- how critical is the above (loss of signal strength?)


regards


Jan Ivar

I've only been 2 hockey games in my life, ironicly the last one last
week. Must have been fresh in my mind. Watched 2 guys punch
furiously and neither one fall over. I seem to remember they grab the
other guys jersey to help with the recoil effect.

Analogies are great because sometimes when you can relate an abstract
phenomenon to an experience someone has witnessed, you can get the
light bulb to turn on real fast.

Kevin Horton wrote in message ...
On Thu, 05 Feb 2004 10:14:59 -0800, Jay wrote:


To make an analogy, trying to use an antenna without a ground plane is
like trying to punch someone in the face whilst wearing ice skates. Ya,
just aren't going to get very much power out there because every time you
swing forward, your body moves back.

I can tell you watched much hockey.