Measuring the rms Accuracy of a Static Directional Antenna

According to Circular 29, to measure the accuracy of the root mean square (rms) value of the static directional antenna, the following method should be implemented:

- The equipment is arranged as shown in the above figure, with two antennas placed in each other's far fields, and the EUT rotated far from the STE. Connect the STE circuit and disconnect the EUT circuit.- The radiation signal level from the STE will be adjusted so that the EUT receives the power density corresponding to the signal-to-noise ratio published by the manufacturer. This power density is expected to be 95% of the MES in the system and will usually be higher by 2 dB over the MES coverage border designed for operation.- Connect the EUT circuit and allow achieving the static directional position.- Static directional accuracy is measured and recorded. The measurement methods used will be agreed upon between the manufacturer and the testing laboratory.- Static directional accuracy is monitored to determine if a change in orientation is present, the rms value of this directional angle will be measured if present.- Static directional accuracy is measured five times.- Disconnect the EUT circuit while the EUT is rotated by at least 90° and for a minimum time of 1 second.- Repeat the measurement steps from connecting the EUT circuit to measuring static directional accuracy five times.- The rms value of the static directional accuracy is the highest value among the 10 recorded measurement results.

See details at Circular 29/2017/TT-BTTTT effective from July 1, 2018.

-Thao Uyen-

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