set the load attenuator for maximum attenuation (vane fully in). Without making any other adjustments, repeat the experiment, recording the results in a further table headed 'Low VSWR'. Some variation of the meter reading may be seen, but it should not be very great. The load attenuator absorbs much of the energy travelling towards the end of transmission line, and, if the remainder is reflected from the end, the Attenuator absorbs most of that. Plot the resulting graph on the same axes as before, labelling the two graphs to distinguish them.
The VSWR is the ratio between the maximum and minimum values of field strength. Since the Detector operates on a square law, the VSWR can be calculated as