good clocks (not using GPS) and multi-channel hw [was: sidebands of great justice]

[coderman]

On Thu, Nov 7, 2013 at 11:32 PM, coderman <coder...@gmail.com> wrote:
> ...
> SDR MIMO kit leaves much to be desired, however.


let me clarify:

the hardware available for SDR MIMO development leaves much to be desired.
  ... the blocks and implementations for OFDM coding in software are OK :)


USRP N2X0 can do it, other setups require external reference clock
with high fidelity.  any recommendations for non-GPS clocks performing
at 50-100ppb or better?