Why is input impedance and VSWR invalid with Current Sources?
NEC-Win Pro uses a modeling trick to implement current sources. The problem with this method is that it uses an NT (network) command to transorm a voltage source located at a point far off in space to a current source located at the antenna. The VSWR, input impedance, and Smith Charts look at the voltage sources. Since this is the case when you request a plot or tabular data of VSWR or input impedance, you will not be looking at the source connected to the antenna but the source connected to the network card. The correct value for the input impedance at the antenna can be found by parsing the NEC output file for the Network Excitation Table. This table contains the impedance after the network transform. Note: Far-field Patterns are not affected by this problem.
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