Re: 12MHz xtals and QER Filter


If the sweep rate is too fast the filter will exhibit tilt.

Also when I went t 82PF I used ATC 100B 5% parts I had so the result was less random.
I also found that the terminating impedance was better and the filter ripple was better with a
differently constructed transformer (ft43-2402 2 hole cores).  I would later design a 100 ohm
transformer that gave better results (2.7khz and flatter).

Keep in mind we have no data across more than a small sample of crystals and maybe only
one vendor.  So variation is expected.


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