Eugene
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Assuming the objective is to resolve the descrepancy between hand calculations and simulation, I would start by using a relative sweep only over the band of interest. I would also limit the the maximum number of sidebands to 1, and then maybe even use an array of sidebands and select only the + or - 1 side band. These changes may bring your simulation in line with your manual calculation. Then you can decide which is more appropriate. Also, as I said before, make sure your manual calculation accounts for changes in loading. For example, if everything in the chain is driven from 50 ohms and loaded with 50 ohms, the usual Friis formula applies. But if you start out with a 50 ohm system then down stream switch to high input impedances, you will have to modify the Friis formula.
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