input and output impedance of a crystal notch filter

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The crystal is a series tuned circuit, so to maintain its Q, it should not be damped(too much!) by operating into a low impedance circuit, conversely if the impedance is too high then the notch becomes too narrow. So in the above circuit the damping R is 330 ohms.
Frank
 

tnx Frank!
so, if I want to test the circuit with my mini-VNA (whose in/out impedance is 52 Ohm) I need two 6:1 transformers to match the impedances...

Claudio
 

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