The electronic technology isn't there yet.
Who wants "the boy who cried WOLF" in the cockpit, or the need to
consider whether you're being interrogated by RADAR for the thing to
work?
Something akin to the Swiss unmentionable-on-this-forum device is
needed in all aircraft.
They fail too, mostly due to bad antennas. But at least you know it
when the towplane or the glider launching after you are not on the
visual display.
Heads up!
Jim

On Feb 20, 3:02*pm, Bruno wrote:
I have had
plenty of alerts when the target is at the same altitude as myself
when the unit is working. *This includes my towplane and other
aircraft in the same gaggle (circling with the air force gliders at a
contest near radar). *In normal operation you never pick up yourself
if you have a transponder.

Bruno - B4