Not actually, not possible. I tested today. It does not receive anything.
Thu, 17 Apr 2014 15:53:39 -0700 от Ron Economos <w...@comcast.net>: >Yes, it's possible. The use of the rational re-sampler >is to be compatible with commercial DVB-T receivers. >If you're just interested in USRP to USRP, then it's >okay to use a 10 Msps sample rate. The signal will >be slightly wider than a standard 8 MHz signal at >9.142857 Msps. > >You can modify my DVB-T Transport Stream bitrate >calculator to determine the required bitrates at 10 Msps. > >https://github.com/drmpeg/dtv-utils/blob/master/dvbtrate.c > >Ron > > > >On 4/17/2014 7:07 AM, Nasi wrote: 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. > >_______________________________________________ >Discuss-gnuradio mailing list >Discuss-gnuradio@gnu.org >https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > -- NE
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