Hi, We are working on an SDR solution for satellite communication using your USRP B210 along with GNU Radio Companion. We got stuck on the first step, i.e. transmitting a simple sine-signal created in GNU radio to an oscilloscope. We are however getting some kind of signal, but it doesn’t seem to be related to the frequency and amplitude of the signal source, but rather to the center frequency of the uhd sink. We have also tried following the tutorial "Building a QPSK Transmitter ” on your website but with the same results. Do you have any ideas on what can be wrong? Regards, Carin

Hi, Have you tried the Ettus UHD examples? https://www.ettus.com/content/files/kb/application_note_uhd_examples.pdf <https://www.ettus.com/content/files/kb/application_note_uhd_examples.pdf> Don’t forget to turn up the Tx Gain :-) Steven Knudsen, Ph.D., P.Eng. www. techconficio.ca www.linkedin.com/in/knudstevenknudsen Der entscheidende Augenblick der menschlichen Entwicklung ist immerwährend. Darum sind die revolutionären geistigen Bewegungen, welche alles Frühere für nichtig erklären, im Recht, denn es ist noch nichts geschehen. - Franz Kafka > On Mar 1, 2017, at 07:17, Carin via USRP-users <usrp-users@lists.ettus.com> wrote: > > > >> Hi, >> >> We are working on an SDR solution for satellite communication using your USRP B210 along with GNU Radio Companion. We got stuck on the first step, i.e. transmitting a simple sine-signal created in GNU radio to an oscilloscope. We are however getting some kind of signal, but it doesn’t seem to be related to the frequency and amplitude of the signal source, but rather to the center frequency of the uhd sink. >> >> We have also tried following the tutorial "Building a QPSK Transmitter ” on your website but with the same results. Do you have any ideas on what can be wrong? >> >> Regards, >> Carin > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com

Hi Carin, maybe you could elaborate a little bit more on you setup? - How does you flow graph look like? - What scope are you using (max BW?) Generally you will not be able to see just the signal you generate using the signal source block on your scope as the USRP is up-converting that signal to RF (to the center freq. you set in the UHD USRP Sink block). Therefore, your scope needs to support a bandwidth that is greater than the center freq. you chose in order to get a meaningful result. Hope that helps. Cheers, Julian On 03/01/2017 03:17 PM, Carin via USRP-users wrote: > > >> Hi, >> >> We are working on an SDR solution for satellite communication using >> your USRP B210 along with GNU Radio Companion. We got stuck on the >> first step, i.e. transmitting a simple sine-signal created in GNU >> radio to an oscilloscope. We are however getting some kind of signal, >> but it doesn’t seem to be related to the frequency and amplitude of >> the signal source, but rather to the center frequency of the uhd sink. >> >> We have also tried following the tutorial "Building a QPSK >> Transmitter ” on your website but with the same results. Do you have >> any ideas on what can be wrong? >> >> Regards, >> Carin > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > -- Julian Arnold, M.Sc. Institute for Networked Systems RWTH Aachen University Kackertstrasse 9 52072 Aachen Germany