JS wrote:
On Mar 8, 9:06 am, "bumper" wrote:

When close to other transponder equipped gliders, the TPAS essentially goes
deaf. If both gliders are being interrogated by ATC or TCAS at very nearly
the same time, the nearby glider's transponder reply will occur while your
transponder replying as well. Your transponder blanks the TPAS receiver
during this period.

bumper

Allo, John.
Interesting.
This implies that the transponder-based collision avoidance system
in a transponder equipped aircraft is of little use when close to
another transponder equipped aircraft. A bit counterproductive,
perhaps?
What relative distance does this blanking occur below?

My MRX manual doesn't directly answer this question, but my reading is
you have range down to at least 0.4 nm, which is 2400'. It's been giving
you advisories and alerts from 5 nm, so you should have spotted the
threat by the time it's that close.

--
Eric Greenwell - Washington State, USA
* Change "netto" to "net" to email me directly
* "Transponders in Sailplanes" http://tinyurl.com/y739x4
* "A Guide to Self-launching Sailplane Operation" at www.motorglider.org