In article , B wrote:

I thought you were referring to DME navaids. Now I understand. I
presume DME navaids must have a limiting number of units they can
respond to too? Stan

I believe he was commenting about DME. I believe the high volumne
facilities can handle 200 aircraft at a time.

The usual means for DME transponders to limit the maximum number of replies
sent out is by reducing the receiver sensitivity so that weaker interrogations
are rejected. This does not necessarily mean that the more distant aircraft
are dropped since airborne interrogaters have different power levels. For
example, my KN-64 is 100 watts (iirc) while the TSO'd KN-62 is 200 watts.

Specifications for DME ground stations are usually expressed in terms of
maximum number of interrogations and replies.

--
Bob Noel
(goodness, please trim replies!!!)