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.

W.J. (Bill) Dean (U.K.).
Remove "ic" to reply.


"Ramy" wrote in message
oups.com...

Thanks Glen. I am not aware of any transponder equiped glider not using
mode C. Seems like once you go through the hassle and cost of
installing a transponder, the encoder is the easy part. Mode A sounds
almost useless, more confusing then not. A mode A transponder could
signal an alert to any airline crusing at 30K above.
Which baffles me - Why aren't modern transponders already including
internal encoder??

Ramy