On Sat, Mar 15, 2014 at 11:14 AM, Marcus D. Leech <mle...@ripnet.com> wrote: > The SBX does analog downconversion, nothing more. It knows nothing about > the incoming signal, and doesn't demodulate it in any way. > > That is what SDR is all about--the signals are represented as > complex-baseband (i/Q) format for processing by computer algorithms. > > The SBX (or any other daughtercard) is simply doing downconversion (or, > upconversion for TX).
Even the simplest quadrature downconversion also needs to avoid clock drift. http://en.wikipedia.org/wiki/Quadrature_modulation#Clocking If your "analog downconversion" above refers to quadrature downconversion, then it is very important to have a phase lock loop (PLL) on the SBX to avoid clock drift. How could this PLL only present at the host (gnuradio flow graph), but not Ettus SBX daughtercard ? Does the flow-graph PLL able to correct all effects due to clock drift of SBX? _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
