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8753E Time Domain Measurement Question

Question asked by BDumke on Jun 4, 2007
Latest reply on Jun 4, 2007 by dgun
I used an 8753E in Time Domain to measure the return losses of the source (in this case a connector) and load (in this case a connector with a precision Weinschel termination).  So the source and load reflections were very small.

What is the higher (noise floor?) in the time domain plot between the source and end reflection coefficients caused by?

Changing the number of points or the bandwidth did not change this any.

Is it due to the impedance of the Andrew 1/2" Heliax cable being not quite 50 Ohms?  I see this on several cables.

I have attached jpeg images of the return loss in both the time and frequency domains.