Hi Scott,

I don't blame you for being confused--the manuals have no schematic!
But the inductors and capacitors in several places (such as the
oscillator and the low pass filter on the ouput) are different for each
band model, so you would not be able to switch a unit to a different
band just by changing the crystal.

Hope this helps (probably not what you wanted to hear),

Glenn Dixon, AC7ZN