On Thu, 12 Jan 2006 17:50:02 GMT, John Miller wrote:

Intermod is from separete signals of different frequencies mixing in
some nonlinear componenent either in or near the receiving apparatus

Or the transmitter apparatus. (We have a great one here, resulting
from a hospital paging transmitter intermodding with just about
everything on a hill that has enough RF floating around to run a few
homes. The paging transmitter - that's supposed to cover only the
interior of the building - is dirty enough and strong enough to cause
intermod in tower joints, fences, who knows what, 5 miles away.)