Eric, sorry about the typo in your name in the message above.

Figuring out the geometry is involved, but some signal overlap is OK.
Explaining it in text is hard, but if you make timing diagrams on a
sheet of paper and translate that to geometry, you'll see the
solution. I think that if someone is in your ATC blind zone, and a
TPAS interrogates your transponder and his, and he's outside of the
TPAS blind zone, you'll see him.

Glad you'll try to call Zaon; this coming week is one I want to forget
before it even gets here!

-John

On Mar 10, 11:29 am, Eric Greenwell wrote:
As long as they don't overlap, then maybe the unit can still pick out a
potential threat.

Sure, I'll try to contact them Monday.