wrote in message
ups.com...
It is possible to get nonlinear interactions among electromagnetic
waves in plasmas, but you generally need very large amplitudes to get
nonlinearities to kick in.

I'm guessing that "space modulation" has something to do with multipath
reflections or something; the VOR signal that rotates is going to be
modulated by the buildings, mountains, and so forth around the
transmitter, generally, the "space"

Just a guess; I don't really know anything about VOR.

Dan


No, I know it has nothing to do with things like that,it is as described in
the FAA lit a normal process of forming the ILS radiation patterns and
applies to VOR, Glide slopes and localizers. Google doesnt help much on the
subject.and I ve gone thru the indexs of about 20 radio and antenna books
without finding anything on it.