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Crosstalk in the time domain

Question asked by loevinnen on Apr 16, 2015
I measure S21 (NEXT) between two pairs of conductors in a long cable and apply time domain transform. The cable has several joints, and in some parts of the cable, the two pairs are not balanced relative to each other, i.e they are connected in a wrong way in the joints. I would expect much more crosstalk in the unbalanced parts, instead I get peaks at the joints. What is the reason for that? I measure in the frequency range 30kHz-6MHz and the cable is 1 km long, but will the same situation be true for lower frequencies?