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Environment/Versions PosApp GSS9000 GSS7000 Answer The procedure in order to cancel out a frequency, from 2 satellites, in PosApp is the following: Open a scenario, e.g. the "All_Defaults" Select the signal type you want, e.g. "Galileo E6" in the "Signal Types" Open the Galileo signal sources file Go to "Orbits" and untick the "Present" box Click "All" to apply it to all satellites Tick the "Present" box for satellite "1" Click the "Copy" button In the "Copy orbits of Satellite 1 to..." tick "2" and then "OK" Go to "Signal Control" --> "General" and select satellite 2 In the "Signal control general" Window, set the "PRN" to be "1", i.e. the same as for the SVID 1 Click "OK" again to exit the "Signal sources file Now, you should be able to see 2 satellites in the "Power Levels Graph" with the exact same characteristics in the "Received Signals" Window, i.e. "PRN", "Elev", "Azim", "Tropo", "Iono", etc  Plug a cable at the rear High Level port of your signal generator  Plug the other side of the cable to a spectrum analyzer  Run your scenario After setting up your spectrum analyzer, you should be able to see the spectrum of your signal (in our case Galileo E6) Click the "Channel Assignment" option in PosApp You should be able to see the 2 satellites you have selected in your scenario Choose one of them and change its "State" to "Multipath" The "Manual multipath settings" Window will pop up Choose "Doppler offset" from the "Multipath type" drop-down list In the "Number of echoes" tick: the "Remote LOS" box tick "Add" A new "Echo#" option will be created with the number "1" Untick the "Random" box in the "Initial phase" Set the "Carrier phase (deg)" to "180" Set the rest of the options to "0" Press "OK" Now, in the "Power Levels Graph" you should see only the LOS signal and the multipath signal, denoted as "GAL A2,1" Check you spectrum analyzer and make sure you are not seeing any spectrum, since the 2 signals should have canceled each other.