Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
On Fri, Aug 2, 2013 at 7:10 AM, Bruno Cardoso bpcard...@gmail.com wrote: Hi Tom, I did the modifications and now I have the WBFM_transmitter_Bruno3.grc http://gnuradio.4.n7.nabble.com/file/n42888/WBFM_transmitter_Bruno3.grc It's working. Thank you a lot. I could do an FM broadcast for the first time from one USRP1 to another USRP1. But I have too much noise and I couldn't listen to it so clear. Could you listen to it clear ? Another thing curious was I could listen to the sound with another USRP1 but I couldn't listen with a normal FM receiver (for instance, a normal FM radio). What's the diference between the USRP1 and normal FM receiver? Thanks a lot!! Bruno Bruno, There's a lot that can happen and a ton of differences between a USRP and a standard FM receiver. You're just going to have to play around with filters, amplitudes, gains, and frequency settings to figure it out. -- Tom Visit us at GRCon13 Oct. 1 - 4 http://www.trondeau.com/grcon13 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
Hi Tom, I did the modifications and now I have the WBFM_transmitter_Bruno3.grc http://gnuradio.4.n7.nabble.com/file/n42888/WBFM_transmitter_Bruno3.grc It's working. Thank you a lot. I could do an FM broadcast for the first time from one USRP1 to another USRP1. But I have too much noise and I couldn't listen to it so clear. Could you listen to it clear ? Another thing curious was I could listen to the sound with another USRP1 but I couldn't listen with a normal FM receiver (for instance, a normal FM radio). What's the diference between the USRP1 and normal FM receiver? Thanks a lot!! Bruno -- View this message in context: http://gnuradio.4.n7.nabble.com/Simple-WBFM-Transmitter-How-to-configure-the-USRP1-block-to-transmit-tp42489p42888.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
Just to complete the email, here is the FM receiver block diagram: FM22.grc http://gnuradio.4.n7.nabble.com/file/n42890/FM22.grc Regards, Bruno -- View this message in context: http://gnuradio.4.n7.nabble.com/Simple-WBFM-Transmitter-How-to-configure-the-USRP1-block-to-transmit-tp42489p42890.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
On Tue, Jul 30, 2013 at 10:35 PM, Bruno Cardoso bpcard...@gmail.com wrote: Hi Tom, I tried to follow your tips but the FM transmitter is not working yet. Here is the file: WBFM_transmitter_Bruno2.grc http://gnuradio.4.n7.nabble.com/file/n42845/WBFM_transmitter_Bruno2.grc I'm matching the sample rates all the way through my flowgraph. I'm also using the USRP1 through the ¨UHD: USRP Sink¨ block with a 250k sample rate, which is a rate that's supported both by N2XX family and USRP1/B100 family. There is something missing yet. Thanks for your help. Bruno Bruno, 1. You don't need a throttle block. A throttle is only necessary when running without any hardware. You have both an audio sink (running at 44.1 kHz) and a USRP sink (running at 250 kHz). These are your rate-limiting blocks and the throttle is just getting in the way. 2. You are massively overloading the signal into the USRP sink. That signal level should be +/- 1 at the very most. But you'll want to back off from that for linearity reasons. Instead of setting the gain of the LPF to 40, create a slider for that that goes from 0 - 1 with 100 steps. Default it to 0.5. The signal looked very clean that way. -- Tom Visit us at GRCon13 Oct. 1 - 4 http://www.trondeau.com/grcon13 ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
On Thu, Jul 18, 2013 at 11:59 PM, Bruno Cardoso bpcard...@gmail.com wrote: The image I sent is not my model. My model was attached to the email. Have you seen it? The image is an example I saw and I noted it's diferent from my. My model WBFM_transmitter_Bruno.grc shows a ''UHD: USRP Sink''. In the example http://www.dl8rds.de/index.php/Datei:GnuRadio_USRP2_FM_TRX.jpg, the USRP Sink is diferent and it has parameter (Interpolation: 200, Side: B, Transmit: Enable) my model doesn't have. In GRC I have just a single block ''UHD: USRP Sink'' I belive it is for USRP1 and USRP2. Yes. If you are using the UHD sink, it will be the same block for any USRP device. I have a FM receiver working fine. I can see and tuning the local FM stations. But from my FM transmitter I can detect only the carrier. I attached my model again, WBFM_transmitter_Bruno.grc http://gnuradio.4.n7.nabble.com/file/n42573/WBFM_transmitter_Bruno.grc If you have a time, take a look on that. Sorry, I don't have time. Keep in mind my earlier suggestion about matching the sample rates all the way through your flowgraph. Regards, Bruno Tom ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
On Sun, Jul 14, 2013 at 8:27 PM, Bruno Cardoso bpcard...@gmail.com wrote: Hello guys, I did the FM receiver (WBFM) based on the link bellow. It's working good. I can tune the local FM stations. http://www.youtube.com/watch?v=KWeY2yqwVA0 1) Now I'm trying to build the FM transmitter. My model is attached to the email. It seems it's working because I can see the graphical sink. 2) My major doubt is about how to use the ''UHD: USRP Sink'', because it's dificult to test this block. I don't know if I set the parameters correctly. 3) The ''UHD: USRP Sink'' block is different in: http://www.dl8rds.de/index.php/Datei:GnuRadio_USRP2_FM_TRX.jpg. The ''USRP Sink'' block in this example has additional options like: ''Interpolation, ''Side'', ''Transmitt''. Is my ''UHD: USRP Sink'' updated or outdated ? 4) I don't know if we have to use diferent blocks for USRP1 or USRP2. Do we have to use ? From the image you sent, it looks like you're using an older version of GNU Radio before we switched to using the UHD. I would recommend updating your version and using the UHD interface to the USRPs since it'll make things a lot easie, and since we're all used to that now, it'll help us understand and answer your questions. If you use the UHD, you can use the same block for any USRP device. Using the older versions will require you to have different blocks for the USPR1 as the USRP2. In general, for things like this, make sure that your sample rates match all the way down the line. So if your signal into the USRP sink is at 640 ksps, make sure that the USRP device is expecting that rate. If you're using the UHD, you'll just set the sample rate. If you're using the older version, you need to understand what the transmitter's DAC rate is and figure out the interpolation value from 640 ksps to meet the DAC rate. Also, to test, if you have something else, like another USRP or other GNU Radio front end device (RTL-SDR for example), you can use a simple FFT program (like uhd_fft) to see the spectrum and see if you're getting any signal out of the device. 5) The center frequency I'm trying to send the signal is the 105,5 MHz. I think I'm receiving the carrier 105,5 MHz, because I can hear a tone and see a signal peak centered in 105,5 MHz in the graphic in the FM receiver model. That's definitely a good start. Tom Thanks for any clue. Regards, Bruno Cardoso ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
The image I sent is not my model. My model was attached to the email. Have you seen it? The image is an example I saw and I noted it's diferent from my. My model WBFM_transmitter_Bruno.grc shows a ''UHD: USRP Sink''. In the example http://www.dl8rds.de/index.php/Datei:GnuRadio_USRP2_FM_TRX.jpg, the USRP Sink is diferent and it has parameter (Interpolation: 200, Side: B, Transmit: Enable) my model doesn't have. In GRC I have just a single block ''UHD: USRP Sink'' I belive it is for USRP1 and USRP2. I have a FM receiver working fine. I can see and tuning the local FM stations. But from my FM transmitter I can detect only the carrier. I attached my model again, WBFM_transmitter_Bruno.grc http://gnuradio.4.n7.nabble.com/file/n42573/WBFM_transmitter_Bruno.grc If you have a time, take a look on that. Regards, Bruno -- View this message in context: http://gnuradio.4.n7.nabble.com/Simple-WBFM-Transmitter-How-to-configure-the-USRP1-block-to-transmit-tp42489p42573.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Simple WBFM Transmitter - How to configure the USRP1 block to transmit ?
Hello guys, I did the FM receiver (WBFM) based on the link bellow. It's working good. I can tune the local FM stations. http://www.youtube.com/watch?v=KWeY2yqwVA0 1) Now I'm trying to build the FM transmitter. My model is attached to the email. It seems it's working because I can see the graphical sink. 2) My major doubt is about how to use the ''UHD: USRP Sink'', because it's dificult to test this block. I don't know if I set the parameters correctly. 3) The ''UHD: USRP Sink'' block is different in: http://www.dl8rds.de/index.php/Datei:GnuRadio_USRP2_FM_TRX.jpg. The ''USRP Sink'' block in this example has additional options like: ''Interpolation, ''Side'', ''Transmitt''. Is my ''UHD: USRP Sink'' updated or outdated ? 4) I don't know if we have to use diferent blocks for USRP1 or USRP2. Do we have to use ? 5) The center frequency I'm trying to send the signal is the 105,5 MHz. I think I'm receiving the carrier 105,5 MHz, because I can hear a tone and see a signal peak centered in 105,5 MHz in the graphic in the FM receiver model. Thanks for any clue. Regards, Bruno Cardoso WBFM_transmitter_Bruno.grc http://gnuradio.4.n7.nabble.com/file/n42489/WBFM_transmitter_Bruno.grc -- View this message in context: http://gnuradio.4.n7.nabble.com/Simple-WBFM-Transmitter-How-to-configure-the-USRP1-block-to-transmit-tp42489.html Sent from the GnuRadio mailing list archive at Nabble.com. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
