Hi all,I am implementing a GPS receiver based on the USRP2 with a DBSRX daughterboard equipped, whereas the software is only using the URSP2 C++ interface, the rest is done without GNURADIO. The receiver works quite well, but I noticed that whatever I do I get really huge spurious signals in the obtained spectra. In order to make clear what I mean, I am attaching a plot of direct sampling at 1.0 GHz with a decimation of 4 and gain=1. There is no signal going in the URSP2 so what you should see is something like instrumental noise. Nevertheless, there are these huge spurious signals. These spurious signals don't change their amplitude nor their relative position w.r.t. the center frequency independent of which RF I choose.
Is this a problem of the DBSRX or is it related to the FPGA, firmware, etc? Any comments highly appreciated. Best regards, Thomas Hobiger -- ****************************************************************** Dr. Thomas Hobiger Space-Time Measurement Project Space-Time Standards Group New Generation Network Research Center National Institute of Information and Communications Technology ------------------------------------------------------------------ 4-2-1 Nukui-Kitamachi, Koganei 184-8795 Tokyo Japan ------------------------------------------------------------------ email: hobi...@nict.go.jp phone: ++81-042-327-7561 fax: ++81-042-327-6664 ------------------------------------------------------------------ homepage (priv.): http://www.hobiger.org ******************************************************************
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