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VECTOR NETWORK ANALYZER IMPEDANCE

Thread starter #4
Here are many application notes:
https://www.omicron-lab.com/applications/vector-network-analysis/application-notes/#

In one of the notes it shows setting the analyzer to 1meg and adding a termination resistor of your choosing.

I was just looking at a network analyzer with in input impedance of (50 or 1meg switchable).

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.
 

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