To measure close in products you need a much narrower RBW typical is
30-100hz, maybe 300hz.? You also need to insure the carrier if any is
not overloading the input of the SA.
If true SSB source and no distortion there is only one signal that being the
sum or difference of the carrier and some carrier leakage which for any
competent system should be at least -40dbc or better.
Its easy to do but you need a suitably narrow bandwidth system.
Allison
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