Collision Avoidance Systems

jcarlyle wrote:
Last week, before the Minden midair, I reviewed Collision Avoidance

Zaon MRX - This was the one I bought. Pros - shows threat distance
and height; receives civilian signals A, C, S and 3/A, as well as
military signals X, Y and 2 (snip)

WTF are military signals X and Y? Military uses IFF modes 1, 2, 3
(same as civilian mode A or 3/A), C (same as civilian mode C - gives
altitude only), 4 (secure), and S. I'm hoping "X" and "Y" are modes 1
and 4, since most military traffic have those on all the time-
especially mode 4.

Neat device, though, and definitely on my xmas list!

Kirk
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