Hello, I am having a similar problem as mentioned by Moeller in his message. I have made the required modifications to be USRP2 + DBSRX. All I see is a noise floor when I try usrp2_fft.py. I am inputting 2.165 GHz signal through RF In. Is there something that I am doing wrong? Do I need external Ref clock? How can I do the basic test of receiving the carrier signal and displaying it ?
Any help to this issue will be highly appreciated. Thank you in advance. Amee Moeller wrote: > > > >>The system is kind of working, but usrp2_fft.py reports Failed (or Invalid if there's a typo) for every frequency we enter regardless > > Hello! > > we have a similar problem with the USRP2 and DBSRX. > The modifications are already done, from the instructions at > http://gnuradio.org/redmine/wiki/gnuradio/USRP2DBSRXModification > http://code.ettus.com/redmine/ettus/projects/public/wiki/U2binaries > > The SMD-resistor was moved (contacts and value were checked). > The Burn DBSRX EEPROM was programmed, togethers with the "Raw Ethernet" > FPGA image (rel-20100603). This all went fine, no error messages. > Later, the "Raw Ethernet, No WBX or XCVR" firmware was played back to the > SD card. > > Now, we can communicate with the USRP2, in usrp2_fft.py we see a spectrum, > with some lines. But changing the frequency has no effect on the spectrum. > There is no "failed" warning in the bands at 800 MHz. It seems to > communicate. > But we receive no signal in the expected frequency. Just always the same > noise > with some fixed lines, regardless of the frequency setting. > > Any idea what could be wrong? > > All other daughter-boards work fine, except the DBSRX. > > Moeller > > p.s. > why do they sell USRP2-daughter-board-combinations at Ettus that are not > compatible? > There was no warning, that hardware-modifications were necessary. > The marketing brochure says, that the DBSRX is USRP2-compatible. > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://old.nabble.com/Can%27t-set-center-frequency-of-USRP2-w-DBSRX-tp29268093p29408488.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio