This is the filter in a kit sold by BG Micro. Dave White's "beginner's and Experimenters" it uses 10 MHzXtals.
When you get your feet under the bench it would be worth a little time to lash one up. A simple circuit with the generator feeding the crystal and a 50 Ohm resistor in series and measuring across the resistor. If you don't have a meter to read the signal with you can do as I do and put a diode feeding an AF amp and use a modulated signal to drive the loop. It is quite touchy as the crystal has a sharp resonant response. When you try 1 Xtal add another and see how it responds. If your generator has any back lash in the adjustment you may find the adjustment is very touchy by the time you have 4 Xtals in the circuit.
Edit: I saw some 16 Mhz Xtals on E-bay 5 cents each. (20 for 99 cents)
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