yes, it supports and i kept two usrp boards at 3m apart from each other. better send that tutorial..
On Thu, Nov 15, 2012 at 11:40 AM, guelord ingala <gueloring...@yahoo.fr>wrote: > If you're sure the XCVR2450 can support TX/RX at 2.45 GHz, then use that > frequency as the antenna can support it. Also what is the distance between > the 2 antennas. I suggest you try with 1-2 m first... > I assisted some students to do this application, It was succesful, I'm > sending you the tutorial shortly. > > > --- En date de : *Mer 14.11.12, Lingeswar Lingeswar <linges...@iith.ac.in> > * a écrit : > > > De: Lingeswar Lingeswar <linges...@iith.ac.in> > Objet: Re: Re : audio signal transmission > À: "guelord ingala" <gueloring...@yahoo.fr> > Cc: discuss-gnuradio@gnu.org > Date: Mercredi 14 novembre 2012, 15h28 > > > ya i checked the datasheet of vert2450 and i tried at 2.45G not at 2.5G. i > just merged two files into one single file. i have two usrp and two > daughter boards as well. and XCVR2450 can support both transmission and > reception at high and low frequency bands. and i know that it cannot > support full duplex transmission. may i know the grc files and the details > of your usrp, daughter boards and gnuradio versions you used for audio > transmission.. thanks. > > On Wed, Nov 14, 2012 at 5:48 PM, guelord ingala > <gueloring...@yahoo.fr<http://mc/compose?to=gueloring...@yahoo.fr> > > wrote: > > I'm a bit confused. For the first files you sent me, the system frequency > was 2.5 GHz. Which implies directly that VERT2450 will not work (see data > sheet). > but for the second files, the system frequency is 2.4 GHz which works well > with the antenna. But ... > In both cases, I'm seeing a problem with XCVR2450 board. It seems to me > that this daughter board operates for 2.4 - 4.5 GHz for transmitter only > and 4.9 - 5.9 GHz for receiver. if so, then the receiver cannot work for > 2.4 or 2.5 GHz. I'm not too sure about it. Please research and find out. > I guess you're having at least 2 separate usprs and 2 XCVR2450 (one for TX > and one for RX). If not, then then setup will not work as the XCVR2450 > cannot be used for full-duplex application. Hope you've read this link: > http://files.ettus.com/uhd_docs/manual/html/dboards.html#xcvr-2450 > > After all this, my suggestion is to get a daughter board that suits your > application easily. i.e SBX board. this will help to operate at single > frequency (2.4 GHz) for the TX, your antenna, and the RX. > > I did audio transmission at 915 MHz, it was successful. > > Keep me posted. > > Regards. > > > --- En date de : *Mer 14.11.12, Lingeswar Lingeswar > <linges...@iith.ac.in<http://mc/compose?to=linges...@iith.ac.in> > >* a écrit : > > > De: Lingeswar Lingeswar > <linges...@iith.ac.in<http://mc/compose?to=linges...@iith.ac.in> > > > Objet: Re: Re : audio signal transmission > À: "guelord ingala" > <gueloring...@yahoo.fr<http://mc/compose?to=gueloring...@yahoo.fr> > > > Cc: discuss-gnuradio@gnu.org<http://mc/compose?to=discuss-gnuradio@gnu.org> > Date: Mercredi 14 novembre 2012, 10h52 > > > hi guelord, thanks for reply.. > the thing is i can able to hear some sound at the reciever similar to the > actual signal with some noise using these flow graphs. whereas if i use the > modulation scheme i can't able to get even noise at the reciever. > i am using USRPN210 and the daughter board is XCVR2450 and the antenna is > VERT2450. i used the wbfm and nbfm techniques and i got the same results as > that of the results i got using the grc files which i sent you earlier. the > files i used for these fm techniques are attached in the single file(i.e > transmitter and receiver are given in one file). > > On Wed, Nov 14, 2012 at 12:33 PM, guelord ingala > <gueloring...@yahoo.fr<http://mc/compose?to=gueloring...@yahoo.fr> > > wrote: > > Hi, > I do believe that these flow graphs will not work. > Transmitter side: > The audio signal (wav file) is not modulated. you simply connected it to > the ursp. I'll suggest you to find a modulation scheme for your > communication system. You may use WBFM transmit. Your usrp center frequency > is 2.5 GHz, it is then assumed that your antenna operates at 2.5 GHz, > otherwise you are wrong. So for your transmitter at this stage, I suggest > to have: wav file, modulator, and usrp sink. Set usrp sink for complexe > float 32. Usrp gain of 50 dB is too high, set it 20-30 dB. > Receiver side: > you need a demodulator. this must match the modulation scheme of the > transmitter. you may use WBFM Receive. usrp source gain is too high. 20-30 > dB is fine. the audio sink sample rate is 44.1 KHz, but the incoming data > has been sampled at 195.312 K. This is a problem. It is called sample rate > mismatch. You need to make sure that the incoming data is down-rated > (decimated) before reaching the audio sink. You may use the fractional > interpolator under filter menu to do it. So your receiver must have: usrp > source, demodulator, sample rate adjust, audio sink. > > This system is not optimum yet. But it is a good start.you might still > have some problems. Keep me posted if you have trouble. Please tell me > which usrp you are using (2, N200 or N210), and which daughter board you've > got. > > Good luck :) > > Dominique, > Durban University of Technology. > > > > > --- En date de : *Mer 14.11.12, Lingeswar Lingeswar > <linges...@iith.ac.in<http://mc/compose?to=linges...@iith.ac.in> > >* a écrit : > > > De: Lingeswar Lingeswar > <linges...@iith.ac.in<http://mc/compose?to=linges...@iith.ac.in> > > > Objet: Re: Re : audio signal transmission > À: "guelord ingala" > <gueloring...@yahoo.fr<http://mc/compose?to=gueloring...@yahoo.fr> > > > Cc: discuss-gnuradio@gnu.org<http://mc/compose?to=discuss-gnuradio@gnu.org> > Date: Mercredi 14 novembre 2012, 5h48 > > > Hi guelord, thanks for reply i am attaching the grc files. kindly go > through those files and send me the necessary corrections. > > On Mon, Nov 12, 2012 at 11:42 AM, guelord ingala > <gueloring...@yahoo.fr<http://mc/compose?to=gueloring...@yahoo.fr> > > wrote: > > Hi Lingeswar, > I guess it would be a good idea if you could send me a picture of your > flow graph in order to see components you are using and how you are setting > them. please give me any information if possible. > :) > > --- En date de : *Sam 10.11.12, Lingeswar Lingeswar > <linges...@iith.ac.in<http://mc/compose?to=linges...@iith.ac.in> > >* a écrit : > > > De: Lingeswar Lingeswar > <linges...@iith.ac.in<http://mc/compose?to=linges...@iith.ac.in> > > > Objet: audio signal transmission > À: gueloring...@yahoo.fr <http://mc/compose?to=gueloring...@yahoo.fr> > Cc: discuss-gnuradio@gnu.org<http://mc/compose?to=discuss-gnuradio@gnu.org> > Date: Samedi 10 novembre 2012, 6h01 > > > thanks for your reply. you mean the gain in usrp specifications in the > usrp? if so i tried it also but the result is still same. how to know the > rate of audio signal received. however i used throttle to manage it at > 44100hz. > > regards, > > lingeswar > > > > >
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