Can I trans/receive without Rational Resampler? It distorts the signal too much :(
Mon, 31 Mar 2014 20:12:27 +0400 от Nasi <nesaz...@mail.ru>: >Thanks a lot! I will try them too... > > >Mon, 31 Mar 2014 09:08:04 -0700 (PDT) от Bogdan Diaconescu ><b_diacone...@yahoo.com>: >> >>One thing I did once and worked are: >> >>1. Use a file sink instead of USRP when transmitting. Then, once the file is >>generated send the samples from file (opened in a file source) directly to >>USRP. That will need a good harddrive with at least 80MB/s read speed, a SSD >>will work probably. >> >>2. Do the above but write the file int RAM like dd if=yourfile.bin >>of=/dev/ram0 - you may need to give root access. Then open /dev/ram0 in a >>file source and send it to USRP. This will consume you RAM and will >>potentiall lock your laptop if the .bin file is bigger than RAM size. >> >>But, indeed you probably need a better computer. >> >>Bogdan >> >> >> >>On Monday, March 31, 2014 6:59 PM, Marcus Müller <mar...@hostalia.de> wrote: >>-----BEGIN PGP SIGNED MESSAGE----- >>Hash: SHA1 >> >>I'm afraid you can't reduce needed sample rate for a fixed bandwidth. >> >>You need a stronger laptop. Often, plugging it into mains power helps. >> >>Marcus >> >>On 31.03.2014 17:52, Nasi wrote: >>> ohhh, now I understand. It produces UUUU in the transmitter side - >>> which probably means underflow with my laptop. Do you know how to >>> decrease this power? >>> >>> >>> >>> Mon, 31 Mar 2014 08:44:49 -0700 (PDT) ?? Bogdan Diaconescu >>> < b_diacone...@yahoo.com >: >>>> For dvbt the bandwidth is around 9.14Msps so with the rational >>>> resampler you need to set-up the USRP at 10Msps. 1Msps will not >>>> work as only a part of the spectrum will be received. >>>> >>>> Bogdan >>>> >>>> >>>> On Monday, March 31, 2014 6:36 PM, Nasi < nesaz...@mail.ru > >>>> wrote: Hi, >>>> >>>> Thanks! >>>> >>>> I am using collected data also as >>> you say. >>>> I am using sampling rate of 1 Mbps instead of 10 Mbps which must >>>> be the same for static transmission. Isn't it? >>>> >>>> >>>> >>>> >>>> Mon, 31 Mar 2014 08:23:01 -0700 (PDT) ?? Bogdan Diaconescu >>>> < b_diacone...@yahoo.com >: Hi, not having access to my setup for >>>> now but for the beginning you could try recording the spectrum >>>> with your USRP and then use the file source to decode the signal >>>> offline. There is a script file apps/capture.sh that I usually >>>> use to capture data. You may tweak it for your needs (frequency, >>>> gain). >>>> >>>> Sometimes it was reported that on old cpus the processing power >>>> is not enough so that the result is an overflow (you directly see >>>> a long OOO message in this case). Try to see if this is the >>>> case. >>>> >>>> One way to reduce the overhead is to run the receiving flow >>>> directly from command >>> line instead of gnuradio-companion (e.g. ./top_block > out.txt) >>> after you have generated the flowgraph. The gnuradio-companion >>> cannot cope with big amount of data when the blocks gets out a lot >>> of text. >>>> >>>> Bogdan >>>> >>>> >>>> On Monday, March 31, 2014 1:22 PM, Nasi < nesaz...@mail.ru > >>>> wrote: Hi all, >>>> >>>> I am using ubuntu 13.04, GNURADIO 3.7. I cannot transmit or >>>> receive using two (USRPN200 + XCRV2450 d.board+VERT2450 antennas) >>>> devices for DVB-T project. Here is the dvb-t project: >>>> https://github.com/BogdanDIA/gr-dvbt >>>> >>>> It will be very helpful and appreciated if you help me. If >>>> someone tested it or can do it, please let me know. As far as I >>>> know someone tested it with N210 model. >>>> >>>> I think this failure is due to high noise/interference or smt. >>>> else. However I tested it already with all possible >>>> configurations. I also attach my .grc files. >>>> >>>> >>>> -- NE _______________________________________________ >>>> Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org >>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>> >>>> >>>> >>>> >>>> -- NE >>>> >>>> >>> >>> >>> >>> >>> _______________________________________________ Discuss-gnuradio >>> mailing list Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>-----BEGIN PGP SIGNATURE----- >>Version: GnuPG v1 >>Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ >> >>iQEcBAEBAgAGBQJTOZDPAAoJEBQ6EdjyzlHtDWwIALcmUMVs7Rrx/WdFtqJ//Fxn >>tzMvsVrDOKBu+5AnmmbVZ20dVulN2lcZ25vZScpFYKOAbe5TwRy2XTsFODHItGNF >>dhmyOQNLVArDSSQuWTLSnMODKEUMCgU/sxyDtal0SVz6KuCSjjwP/exgaKHtNweU >>tQid+PdH0JTZ/5iqvtQyHJhwy0rcl0RIK8ig0MXhoQG8IQVl2lKZXUtlOle1wMsC >>w5oed0uop0d1J4bWDxC3oBRd6DfSCLx9avXtCHEFdgiAZSkFPva0XhJbimm3K8GP >>V6qzH2S29eojRZYQHqlWxy8ISMG8SCr0Ii2joHv6iESCB9cgK1KkWrECMc0Ltvk= >>=HjFO >>-----END PGP SIGNATURE----- >> >> >>_______________________________________________ >>Discuss-gnuradio mailing list >>Discuss-gnuradio@gnu.org >>https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >>_______________________________________________ >>Discuss-gnuradio mailing list >>Discuss-gnuradio@gnu.org >>https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > >-- >NE -- NE
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