| Resumo: | In a radio frequency communications, we need an instrument for
measuring the mismatch between the transmission line to the load on the
communications radio antenna typically used SWR (Standing Wave Ratio) meter.
In general, the SWR meter in the market use a system analogous with a directional
needle . The weakness of this system is not easy to reading because the scale on
the meter pointer does not show the positions per unit mass , and increase the
possibility of reading errors .
SWR meter and power meter is a measuring instrument that designed to
measure of transmit power and SWR values in a transmitter that is displayed on
the LCD character . In this system the amount of transmit power that moves
forward and backward read by a converter through a circuit directional coupler .
The result of power conversion then will be process by the Arduino to calculate
the value of transmit power and SWR .
For testing, performed by comparing the results of measurements between
SWR meter measured with SWR meter standard is Power and SWR Meter Wellz
SP - 300 as a reference. From the test results and analysis , the error values of
measurement with the SWR radiated power is ± 0.0038 Watt with 99.93 %
accuracy measurement. As for measuring the value of SWR measurement
accuracy ± 0.0068 with 99.91 %
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