Cheap, light transponder (was: Gliders and Radar)

From: (Julian Scarfe)
Organization: University of Cambridge
Date:         29 Jul 96 13:24:41 
References:   1 2
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In article <airliners.1996.1412@ohare.Chicago.COM>,
(C. Marin Faure) wrote:

> If that's the case, the only
> solution would be to install a transponder on the glider...

I seem to remember a line in an AOPA magazine (UK) some time ago that
suggested that the CAA had investigated the possibility of a cheap, light
transponder for use in aircraft such as gliders.

Can anyone comment on the feasibility of such a device?  What is the state
of the art in SSR transponders?  How much power does a transponder
require?  Could you run one on batteries?  What limits its weight?  Its
cost?  Is there ongoing work in this area?

Julian Scarfe