"And your point is"
My point is that the tower controller thought I was someone else. He thought I was on the ground, when in fact I was on final....not very good for controlling visually (I know this because when I told him I was still on final he had to ask who was on the ground)
In my example of different runways, these are intersecting runways, 30 & 25L and from the aircraft on ILS 30 the PA28 on final for 25L might look like a 'threat'..... Several times I have 'raced' an aircraft on the ILS, to land a minute or so before them on 25L. If this doesn't trigger the TCAS then I can't see why an orbiting aircraft would trigger it....But you're right I don't know much about TCAS, so I'll read up on it .....
Its useful for a pilot to get the 'inside' info from ATC, I totally understand that there is no need to cause a missed approach by use of the transponder, its just no one has ever explained this before.
Cheers
EA