Hi all, Now I'm confusing intermediate frequency of RFX2400. I cannot find any references about that. As I know so far, RFX2400 converts carrier frequency(we selected it on python script) band freq to 10Mhz intermediate freq. This 10Mhz signal is passed to FPGA. Therefore, DDC frequency is fixed on 10Mhz. Is it right? Any help is appreciated. Y.C -- View this message in context: http://www.nabble.com/Intermediate-Frequency-of-RF... Sent from the GnuRadio mailing list archive at Nabble.com.
on 2009-01-29 02:16
on 2009-01-29 03:22
On Wed, Jan 28, 2009 at 04:09:54PM -0800, Yong J. Chang wrote: > > Y.C The RFX boards are quadrature direct conversion. We feed them complex basebase within a few MHz of DC. The DDC/DUC are used for fine tuning since the VCO on the daughterboards have a non-zero step size. You can see what's happening by examining the result from u.tune(). I highly recommend the USRP FAQ: http://gnuradio.org/trac/wiki/UsrpFAQ http://gnuradio.org/trac/attachment/wiki/UsrpFAQ/U... See also the nice diagrams on this page: http://gnuradio.org/trac/wiki/UsrpRfxDiagrams Eric