Here's what I did. I terminated the common port with 50 ohms. I fed a signal into one of the other ports and connected it to a 50 ohm input of my scope. I measured the output of the signal generator with the same scope, but only connected to the scope.
The signal generator output was 300mV, the output of the port that the signal generator wasn't connected to was 5mV. I tried calculating the power ratio, using P=E squared/50 and got 90 db. That seems unlikely, where did I go wrong?
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