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Measurement noise figure under 75Ohm TV tuner

Question asked by NCCU1990 on Apr 21, 2008
Latest reply on Apr 21, 2008 by RayH
Dear Sir:

I want to do the noise figure at the 75 Ohm TV tuner.
But most of the noise source is 50 Ohm , how can I do the impedance covert in this noise figure measurement? If I add the 75Ohm to 50 Ohm matching pad at the TV tuner input  , the ENR value of the noise source will reduce. How can I do the correct 75 Ohm noise figure measurement? I will use the PSA E4440A in the noise figure measurement.