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Yes, I thought so. I have the original Motorola S-parameters for the 2N5179 RF transistor where the stated ZG and ZL=50 Ohms. I also have another set of S-parameters from Microsemi where ZG and ZL are unknown. The two sets don't nearly match. From what you've told me I think that Microsemi might have used an analyzer set at ZG and ZL=1MegOhm and used a couple of 75 Ohm shunt resistors across the input and output of the transistor.