> However, if you buy some more hardware, you can drive both USRP2 and
> USRP1 from the same clock. The USRP2 takes a 10 MHz standard, but the
> USRP2 needs a 64 MHz clock.

You can actually use a common reference between the USRP1 and USRP2 by
modifying some of the USRP2 firmware code so that it can take a
reference other than 10MHz. See
http://gnuradio.org/trac/wiki/USRP2GenFAQ#Doestheexternalfrequencyreferencehavetobe10MHzCanIuse100MHz
This code is located in usrp2/firmware/lib/clocks.c

-Kyle


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