Reactance (X) and Impedance (Z) measurements are inaccurate below 2 GHz and very inaccurate at higher frequencies. Anyone who buys this network analyzer solely to measure the SWR will not miss out either. It is practically impossible to get reproducible results. A user calibration with an open, short 50 ohm load will result in a completely discontinuous profile. Even a 50 ohm load shows an SWR of 2.2:1. Firmware update is not carried out. Mine came with v0.83 and searching for a bug fix firmware didn't return any results. Brand on it, AAI is nowhere to be found. There isn't even a formal presence on the Chinese retail side.
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