It's a computed time domain plot. Without knowing the exact instrument specification and actual measurement and transformation parameters, it's likely to jump into conclusions. There's also indicated CAL:ON. What does calibration involve in this case?I think the measured RL values at 1700-2000MHz should be less than values at 700-1000MHz because cable loss is higher at higher frequencies.
Return loss is ratio of total and reflected power and p is Pr/Pi. p is a positive value 0-1. It can not be above or below these values due to physical limitations. Expressed as VSWR is it a value 1 and up and expressed as dB is it less then 0 dB as less then 0 dB is less then 1. It results in dB values with a minus sign but it is still a positive amount of power that reflects back. If calculating in dB must also mathematical dB rules apply. A few exampels:The question i have is which one is the general description of return loss? In which ares we use positive and negative description?
How calculate cable and antenna analyzers or network analyzers the return loss?
Correct, cables get broken for a lot of reasons but when the fault is found with aid of suitable instruments, is further guesses and material inspection and analyzing normally not of interest. Nothing without exception of course. At aircraft accidents and similar can a deeper analyze be of interest of faulty cables to try to find if the problem existed before the accident.I can well imagine similar discontinuties in typical cable test applications. Consider e.g. a TV network cable that may have been damaged when pulling it into a pre installed conduit. These cables aren't installed by qualified RF engineers.
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