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biff44 said:Just search around on "multi tone intermodulation". Here is one:
h**p://www.maxim-ic.com/appnotes.cfm/appnote_number/728
The problem in CATV is that you have 200 RF channels, right next to one another. So, a 2 tone intermod test is a little too easy for the components. You put in 3 or 5 tones, and see what the highest intermod products are. Multitones can constructively add or subtract to really have a big peaking factor--really stressing things like amplifiers.
If you have high intermods, one or more CATV channels interfer with a desired one, and the system stops working.