"matt weber" wrote in message
...
On Sat, 30 Aug 2003 12:18:13 +0100, "Keith Willshaw"
wrote:


They show up on most ATC radars only because they have a transponder.

Nonsense they show up on primary radar very well

Note the difficulties US ATC had in locating 757's and 767's on 9/11
after the transponders were turned off, and 757 or 767 has a far far
larger radar cross section than a single engine cessna.


Again this is nonsense, the radar tracks of those aircraft have been
produced in evidence primary radar is more than adequate

ATC radars generally only see either very large targets, or very
cooperative targets (transponders).

Wrong, ATC radars track light aircraft every day.

Hell the radars of WW2 had no problem tracking aircraft of the
same size, its for damm sure that modern radars are better

Keith