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Return loss measurement on balanced filter

Question asked by ddebes on Mar 26, 2007
Latest reply on Mar 30, 2007 by Dr_joel
I'm trying to measure the return loss on a POTS splitter over POTS band (1k to 4kHz).  I normally do this using an Agilent 4395A network analyzer with a transmission/reflection adapter using 50:600 baluns to match the splitter impedance and then let the analyzer do all the work.  However, the sample I am trying to test now is for the UK and has a complex nominal impedance and I'm lost on how to accurately measure it.  I started going down the balanced bridge method so that I could match the complex impedance on the bridge, but am not sure how to calibrate the analyzer using this approach.  Any ideas will be appreciated.  Thanks, David