For testing the procedure I'e used is:
Both signals are low pass though a 7 or 9 section filter.? They must be
clean and the usual source had? HP part numbers.
Each signal has its own step attenuator.
I then combine them with a resistive mixer or other RLB (makes a good combinter).
Then with know quality gear measure levels.? its more to calibrate what
I'm putting in vs what I think I'm putting in.? Then verify the SFDR of
the test setup.? Its very easy at high level for one source to push
another source into distorted or mixed output.? Isolation and filters
are helpful in keeping that from being an issue.
With that SFDR, Compression and IP3 are determined.
Allison
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