I'm not in the market for a transponder, but I do like the low current
draw, the built-in encoder, and the maximum 35,000 foot reporting
alititude of the Filser TRT800. The problem for me would be that it
isn't approved for use in the US.

Does anyone know what the hang-up is with regard to US certification of
the Filser transponder?

-John

W.J. (Bill) Dean (U.K.). wrote:
All the transponders currently listed by Filser
http://www.filser.de/onlineshop/english/ are modes A/C and S, and have
extended squitter; they all have an integral alticoder. These are probably
the cheapest on the UK market http://www.lxavionics.co.uk/ .

I would be surprised if this is not true of other makes, I am sure it soon
will be.