vswr measurement

[paul51]

I am making a VSWR(S11) measuremen with a network analyzer. I do not know how to interpret the data .
I ultimately wamt to calculate return loss (-20log(p)). Can anyone tell me how to calculate p from the waveform displayed?

 

[Lewish]

Tell us what network analyzer you are using. Most give the S11 measurement as return loss in dB. S11 is return loss. It is just a question of what units the analyzer is reporting in.