I have purchased two of these converters to measure the insertion loss of twisted pair telephone wire at different length. The result I am getting does not look anything I expect. For my testing I use a network analyzer (a spectrum analyzer with signal source that can be used as network analyzer). I use the normalization feature of the analyzer to zero out the effect of these BALUNs and expect to see no or very little attenuation and almost a flat response up to 200MHz for short length and gradually get attenuated with longer length of wire pairs.
Should I remove the two 49.9Ohm resistors on both of these BALUNs?