[USRP-users] Question about sign inversion between tx/rx frequencies in N210

Josh Blum josh at ettus.com
Mon Sep 24 09:06:42 EDT 2012



On 09/22/2012 05:01 PM, Robert Palumbo wrote:
> Hey All,
> 
> I'm really just curious (and may be mistaken), but it looks like the
> sign of the frequency used in the DUC is opposite that to the the one
> used in the DDC (using UHD v. 003_003_001). Why is this, shouldn't
> rotating the phase either way produce the same result?
> 
> Rob
> 

I think the 3.3 should have behaved the same in this rearguard. But yes,
the sign should be opposite. Think if multiplying e^-jw for
downconversion and e^jw for upconversion.

-josh




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