Help to construct a Balun

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ptmsl

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I need to construct a Balun to connect a 100R balanced line (an ADSL line) to 50R unbalanced in order to measure the Power spectral density of an ADSL interface with a 50R Spectrum Analyzer. The spectrum I am intrested in is betwen 10KHz and 10MHz or more. I prefer not to wind my own coil (maybe use an ADSL transformer?) and use off the shelf components. Can you help?
 

Minicircuits makes many transformers. They will sell them in quantities of one and you can order by telephone with a credit card.
 

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