A thought experiment and an issue with comparison of the single crystal with the matched filter counterpart. A single crystal in series mode is embedded in a 50 ohm system, in this measurement. Essentially, operating with a doubly loaded Q. If this de-Q effect is significant, the issue we are trying to address may not show itself. We really would like to transform the VNA source and load in affect to an impedance level that would operate the xtal as close as possible to its unloaded Q value. Of course, NOT a straight forward task.
