Re: [Discuss-gnuradio] Raw Samples from Receiver
Noted... but in my defence the questions were asked to aid my understanding of what is happening in the (stock) UHD code... the background was to explain why I was bothering. -Original Message- From: Marcus D. Leech [mailto:mle...@ripnet.com] Sent: 30 November 2011 23:54 To: Suleja, Lukasz; Discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Raw Samples from Receiver As background, I have 10 32-bit words of metadata prefixed to a burst of complex samples and I need to extract (and remove) them. I noticed recently that the trunk has some code related to tagging; in your opinion would the transport of my metadata be better done using tagging or is there an alternative method you can suggest. It is important that the metadata remain associated exactly with the burst samples. So, a friendly note that if you're running non-standard firmware/FPGA, you should note that earlier, rather than later, when you're asking for help from this list. 99% of the folks on this list use the as-shipped FPGA/Firmware that is compatible directly with gr-uhd/Gnu Radio. So when a question is asked the context that most answerers have is the as-shipped FPGA/Firmware. Which is why I delivered my lecture about ADC samples getting mangled by the decimators in the FPGA, and why would you care, etc, etc. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org -- Queen's Award for Enterprise and Innovation 2011 Roke Manor Research Ltd Romsey, Hampshire, SO51 0ZN, United Kingdom http://www.roke.co.uk Part of the Chemring Group Registered in England Wales at: Chemring Group PLC, Chemring House, 1500 Parkway, Whiteley, Fareham, Hampshire PO15 7AF, ENGLAND. Registered No: 267550 The information contained in this e-mail and any attachments is proprietary to Roke Manor Research Ltd and must not be passed to any third party without permission. This communication is for information only and shall not create or change any contractual relationship. Please consider the environment before printing this email ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] USRP/WBX DUPLEXER TUNING
On 1-12-2011 11:36 AM, dave k wrote: If i were to use a usrp to tune a repeater duplexer, could i just connect both WBX ports directly to the can's, and use one port to tx and the other to RX? Would i need to add some inline attenuation? For clarification i would be doing this with 1 WBX The absolute maximum RX power on a WBX is about -10dBm, when turned up to maximum gain. Beyond that, and damage to the 2nd-stage LNA is almost guaranteed. So, as a safety precaution, I'd put a 30dB to 60dB attenuator in-line in front of the RX2 port on the WBX, depending on what your expected TX power is going to be. When you're tuning cans, you're trying to maximum the isolation between TX and RX, with split-frequencies between TX and RX. And you can easily pass through a region where TX and RX isolation is zero while tuning them up. ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] USRP/WBX DUPLEXER TUNING
ok thaks. I wasnt sure if i should add attunetion or simply decrease tx power. Now that im thinking about it, maybe its not really neccessary to sweep the feeq range? The usrp could just shoot a 8mhz wide signal (noise?) into the thing, and visualize in realtime the notches and pass bands change as i adjust the cavities. Rx and tx seperatly of course. Thoughts? Sent from Yahoo! Mail on Android ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] stream tags in Python
Dear all, I need to use stream tags and the get_time_last_pps informations to control the received data storage. I am wondering how to get the stream tags in Python? I tried the method used in C++ and transfered in Python samp0_count = self.nitems_read(0) get_tags_in_range(rx_time_tags, 0, samp0_count, samp0_count + ninput_items) but got the error:'gr_top_block_sptr' object has no attribute 'nitems_read' I tried gr.tagged_file_sink to directly store the time tags with the received data into one data file, though I could not really see the data file created by this file sink block. How can I pull out the stream tag from the downstream corresponding with the received data in order to get the time or number of samples of certain received data? Any suggestion will be really appreciated. Thank you so much! Thanks, Yan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] Gr-UHD thinks i have the wrong firmware
Hello, Why does gr-uhd think I have the wrong firmware, when UHD says I have the right firmware? I am getting the expected compatibility number 8, but got 6 error with gr-uhd, but all the UHD example work properly. The background is that I recently upgraded to gnuradio 3.5 but then switched back to 3.4.1. Thanks Scott ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] submission to academic paper section
I'd like to submit my own graduation thesis to the academic section of the gnuradio wiki. Which is the right way to do it ? Regards, Arturo ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] submission to academic paper section
Arturo, Am 01.12.2011 20:05, schrieb Arturo Rinaldi: I'd like to submit my own graduation thesis to the academic section of the gnuradio wiki. Which is the right way to do it ? congratulations! Just add it yourself. Have a look at the mailing list archive or the web page on how to do that. Jens ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Gr-UHD thinks i have the wrong firmware
On 12/01/2011 01:31 PM, Scott Johnston wrote: Hello, Why does gr-uhd think I have the wrong firmware, when UHD says I have the right firmware? Perhaps you have multiple versions installed and you linked gr-uhd against one, and the uhd examples against another. I recommend just cleaning your installs and re-building gr-uhd with exactly the version you want installed. -josh ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] stream tags in Python
On 12/01/2011 01:31 PM, Yan Nie wrote: Dear all, I need to use stream tags and the get_time_last_pps informations to control the received data storage. I am wondering how to get the stream tags in Python? You need my next branch installed. (BTW, I am working on squashing some of this work so Tom will feel safe to merge it into the mainline). http://gnuradio.org/redmine/projects/gnuradio/wiki/WriteBlocksInPython http://gnuradio.org/redmine/projects/gnuradio/wiki/BlocksCodingGuide -josh ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] which math library to link with
We are writing a block that requires SVD of matrices. Is there a preferred library (eg, LAPACK) that other gnuradio blocks are already using that we can link with. I don't want to add another library dependence... thanks Achilleas ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] which math library to link with
gsl On Dec 1, 2011, at 4:56 PM, Achilleas Anastasopoulos anas...@umich.edu wrote: We are writing a block that requires SVD of matrices. Is there a preferred library (eg, LAPACK) that other gnuradio blocks are already using that we can link with. I don't want to add another library dependence... thanks Achilleas ___ 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
[Discuss-gnuradio] Question about benchmark_tx and benchmark_rx
Hi, Thanks for reading my mail. I would like to ask is there any additional setup or configuration required to execute benchmark_tx.py and benchmark_rx.py? My problem is I tried to initiate simple communication between two USRP1 using benchmark_rx.py and benchmark_tx.py . I had browse through the mailing list looking on how to use the file appropriately. Running benchmark_tx.py also execute help which I follow closely but failed to receive any packets. If I tried to execute at transmitter: benchmark_tx.py -f 400M -S 10 and at receiver benchmark_rx.py -f 400M -S 10 I did not received packet status. I only received '0' in the terminal. Is it correspond to error? I also read mailing list sent by other members but none mentioned about not able to execute benchmark_tx.py . If I missed any post, could anyone please provide me the link. For additional information: Gnuradio version used: v3.5.0rc0 USRP1 : revision 4 Ubuntu: 11.10 Daugtherboard: SBX Please let me know if I had to provide any additional information. -- Regards, Muhammad b Rosli Student Bachelor of Electrical and Electronic University of Canterbury ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question about benchmark_tx and benchmark_rx
On 12/01/2011 09:36 PM, Muhammad Rosli wrote: Hi, Thanks for reading my mail. I would like to ask is there any additional setup or configuration required to execute benchmark_tx.py and benchmark_rx.py? My problem is I tried to initiate simple communication between two USRP1 using benchmark_rx.py and benchmark_tx.py . I had browse through the mailing list looking on how to use the file appropriately. Running benchmark_tx.py also execute help which I follow closely but failed to receive any packets. If I tried to execute at transmitter: benchmark_tx.py -f 400M -S 10 and at receiver benchmark_rx.py -f 400M -S 10 I did not received packet status. I only received '0' in the terminal. Is it correspond to error? I also read mailing list sent by other members but none mentioned about not able to execute benchmark_tx.py . If I missed any post, could anyone please provide me the link. For additional information: Gnuradio version used: v3.5.0rc0 USRP1 : revision 4 Ubuntu: 11.10 Daugtherboard: SBX Please let me know if I had to provide any additional information. -- Regards, Muhammad b Rosli Student Bachelor of Electrical and Electronic University of Canterbury You're asking for 10 samples per symbol, which may exceed the rate at which your receiver computer can keep up, depending on the modulation used, and the complexity of the modulation techniques. Are you using the narrowband or ofdm examples? The 'O' means overrun. The hardware (USRP1) is sending samples faster than your computer can keep up. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Question about benchmark_tx and benchmark_rx
Hi, Thanks for your reply. I am using the narrowband example. If I attempt using ./benchmark_tx.py -f 400M -r 250k -S 4 and ./benchmark_rx.py -f 400M -r 250k -S 4 which I worked out from reading the README file, the receiver still output overrun (many '0'). I verified that the transmitter working since my spectrum analyser can pickup the signal from the transmitter. -- Regards, Muhammad b Rosli Student Bachelor of Electrical and Electronic University of Canterbury On Fri, Dec 2, 2011 at 3:56 PM, Marcus D. Leech mle...@ripnet.com wrote: ** On 12/01/2011 09:36 PM, Muhammad Rosli wrote: Hi, Thanks for reading my mail. I would like to ask is there any additional setup or configuration required to execute benchmark_tx.py and benchmark_rx.py? My problem is I tried to initiate simple communication between two USRP1 using benchmark_rx.py and benchmark_tx.py . I had browse through the mailing list looking on how to use the file appropriately. Running benchmark_tx.py also execute help which I follow closely but failed to receive any packets. If I tried to execute at transmitter: benchmark_tx.py -f 400M -S 10 and at receiver benchmark_rx.py -f 400M -S 10 I did not received packet status. I only received '0' in the terminal. Is it correspond to error? I also read mailing list sent by other members but none mentioned about not able to execute benchmark_tx.py . If I missed any post, could anyone please provide me the link. For additional information: Gnuradio version used: v3.5.0rc0 USRP1 : revision 4 Ubuntu: 11.10 Daugtherboard: SBX Please let me know if I had to provide any additional information. -- Regards, Muhammad b Rosli Student Bachelor of Electrical and Electronic University of Canterbury You're asking for 10 samples per symbol, which may exceed the rate at which your receiver computer can keep up, depending on the modulation used, and the complexity of the modulation techniques. Are you using the narrowband or ofdm examples? The 'O' means overrun. The hardware (USRP1) is sending samples faster than your computer can keep up. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org ___ 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
