Voltage Standing Wave Ratio (VSWR) is a measurement used to quantify the amount of signal reflection on a transmission line. It is important to check VSWR to ensure that the signal is being transmitted efficiently and to identify any potential problems with the transmission line. A high VSWR can indicate that there is a mismatch between the impedance of the transmission line and the impedance of the load, which can cause signal loss and damage to the equipment.
There are a number of different ways to check VSWR, but the most common method is to use a VSWR meter. A VSWR meter is a device that measures the ratio of the forward power to the reflected power on a transmission line. The VSWR can then be calculated using the following formula: