Hi Derek, Thanks for pointing, I initially thought as the throttle was connected to WX GUI FFT it won’t affect the USRP sink.
But the issue does not get resolves even after the throttle is removed. I tried increasing the gain to 30 and adding a multiply constant of 500 after the OFDM Mod block. As a beginner I did not knew about the log file. As I check the documentation the file is /usr/include/uhd/utils/log.hpp but I am not sure how to run/see this logging. Any document link that you can provide as an example? On another hand I have tried implementing the exact same flow as in the link https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations - “The PSK Mod with USRP sink” one. And I am unable to get any output in spectrum analyzer as shown. Thanks, Ayaz ________________________________ From: Derek Kozel <derek.ko...@ettus.com> Sent: Monday, June 11, 2018 1:34:01 PM To: Ayaz Mahmud Cc: usrp-users@lists.ettus.com Subject: Re: [USRP-users] Spectrum analyzer not picking up any signal from USRP-GNU Radio Hello Ayaz, Because you have hardware in your flowgraph (the B210) you should not include a throttle block. Check your log output, it is very likely that UHD is reporting underflows. I'd recommend quickly running through the GNU Radio tutorial on using hardware. https://wiki.gnuradio.org/index.php/Guided_Tutorial_Hardware_Considerations Also the UHD manual has some general guidance which will help you to understand UHD's messages. http://files.ettus.com/manual/page_general.html Regards, Derek On Mon, Jun 11, 2018 at 8:26 PM, Ayaz Mahmud via USRP-users <usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com>> wrote: Hi, GNU Radio version 3.7.11 USRP B210 with 1 x 2.4GHz antenna Spectrum Analyzer with 2.4 GHz antenna I am trying to transmit the below flowgraph through USRP and receive a signal with Spectrum Analyzer. Though the Spectrum analyzer will not be able to demodulate it should show a stable frequency. Unfortunately, the spectrum analyzer does not pick any signal while calibrated at Center Freq: 2.412 GHz. GNU-Radio console warning: gr::log :WARN: ofdm_mapper_bcv0 - The gr::digital::ofdm_mapper_bcv block has been deprecated. gr::log :WARN: ofdm_insert_preamble0 - The gr::digital::ofdm_insert_preamble block has been deprecated. GNU Radio version 3.7.11 USRP B210 with 1 x 2.4GHz antenna Spectrum Analyzer with 2.4 GHz antenna Block diagram attached. I am trying to transmit the below flowgraph through USRP and receive a signal with Spectrum Analyzer. Though the Spectrum analyzer will not be able to demodulate it should show a stable frequency. Unfortunately, the spectrum analyzer does not pick any signal while calibrated at Center Freq: 2.412 GHz. GNU-Radio console warning: gr::log :WARN: ofdm_mapper_bcv0 - The gr::digital::ofdm_mapper_bcv block has been deprecated. gr::log :WARN: ofdm_insert_preamble0 - The gr::digital::ofdm_insert_preamble block has been deprecated. Where can this possibly go wrong? Thanks, Ayaz _______________________________________________ USRP-users mailing list USRP-users@lists.ettus.com<mailto:USRP-users@lists.ettus.com> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
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