Farnell sell 32.768 MHz crystals (They're not what you'd call cheap though -
AU$17). Hmm they have 16.384 MHz ones for $12.81. Still not cheap..
Also, I think getting 32.768 MHz from 4Mhz with a PLL would be pretty
difficult (if not impossible)
Given that you haven't looked into the PLLs on the FPGA, it's rather too
early
to conclude that you couldn't synthesize 32.768Mhz from the 4Mhz reference
clock that's already on the USRP.
Given reasonable dividers for both reference and VFO, I can't see why
synthesizing
32.768Mhz would be all that difficult. I can understand why you might
want to
use a dedicated oscillator--you don't have to muck with the FPGA.
But asserting that
it's "difficult (if not impossible)" is hard to support if you haven't
looked into it.
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