Measurements can be made at ground level and translated as if they were at the antenna feedpoint by using the refer to antenna function. With a laptop computer, the unit is quite small and portable. Power for the VNAuhf can be obtained from a small DC power supply or a battery. The frequency is very stable and it can be calibrated to WWV.ĭigitized data is sent to the PC via an optically isolated USB port. The RF generator can also be used as a signal source for testing receivers. The sign of the phase angle indicates either inductive or capacitive reactance without ambiguity. Impedance measurements can range up to 10K ohms.
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