Many transponders in close proximity

Kilo Charlie wrote:
Ya I'm pretty uncertain now re the take home message for those of us with
mode C installed already. I thought that it was a given that traffic with
TCAS were seeing me and that center/approach could also and vector traffic
around me. After this thread I 'm not feeling froggy about any of this. In
Phoenix and most other places I fly I have been squawking 1200 (Ely,
Moriarty) but are you guys saying that I will be ignored by ground radar due
to filtering for airspeed and by TCAS for 1200???? Glad I spent the $2000.
It all seems inane to me that we go to the effort to be seen and our reward
is being "filtered out" because some moron thinks we aren't a real threat.

You aren't being filtered out by airspeed or code. Read the posting by
Billy Hill. Your transponder is being seen by ATC, the airliner TCAS,
and everyone with a TPAS unit, so I think your $2000 was a good value
(that's what my Becker cost me, too). We still have to worry about all
the other gliders (even those with a transponder, because I don't have a
TPAS unit yet), and some/many of the small airplanes, too.


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Eric Greenwell - Washington State, USA

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