# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=51 [Latest](https://www.ruby-forum.com/latest.md) · [Categories](https://www.ruby-forum.com/categories.md) · [Tags](https://www.ruby-forum.com/tags.md) **Page:** 52 --- ## [RF packet length of narrowband benchmark\_tx](https://www.ruby-forum.com/t/rf-packet-length-of-narrowband-benchmark-tx/232156)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 29, 2014, 5:28am UTC](https://www.ruby-forum.com/t/rf-packet-length-of-narrowband-benchmark-tx/232156 "2014-09-29T05:28:29Z")
Hello, I am using narrowband benchmark\_tx.py example to transmit packets. Each single packet is separated from its neighbors by a second. The parameters I am using: benchmark\_tx\_modified.py -m gmsk -s 4000 -r 1000000… --- ## [Incrementing variable value in every cycle](https://www.ruby-forum.com/t/incrementing-variable-value-in-every-cycle/232264)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 29, 2014, 12:24am UTC](https://www.ruby-forum.com/t/incrementing-variable-value-in-every-cycle/232264 "2014-09-29T00:24:20Z")
Hi everyone, I’m playing with gr-ieee802-11 wifi\_loopback example, I want to change some variable values in every cycle, but i cannot find any way to do this. Is it possible with gnuradio-companion? regards. --- ## [SNR Peak AMplitude and Noise Floor Calculation](https://www.ruby-forum.com/t/snr-peak-amplitude-and-noise-floor-calculation/232235)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 28, 2014, 5:40am UTC](https://www.ruby-forum.com/t/snr-peak-amplitude-and-noise-floor-calculation/232235 "2014-09-28T05:40:43Z")
My question is if we have an incoming signal coming from a usrp, How do --- ## [Gr-uhd multi\_usrp bug in 3.7.4+](https://www.ruby-forum.com/t/gr-uhd-multi-usrp-bug-in-3-7-4/231894)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 27, 2014, 10:46pm UTC](https://www.ruby-forum.com/t/gr-uhd-multi-usrp-bug-in-3-7-4/231894 "2014-09-27T22:46:55Z")
Hi, Looks like either the syntax for instantiating multi\_usrp has changed (seems unlikely), or a bug was introduced, likely in 7/2-7/4’s recent gr-uhd refactoring (1eaa96b, 350d285, fe58537, 3c42e79, 691bdaa). Sorry … --- ## [Bypass work function](https://www.ruby-forum.com/t/bypass-work-function/232191)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 26, 2014, 7:19pm UTC](https://www.ruby-forum.com/t/bypass-work-function/232191 "2014-09-26T19:19:06Z")
I have following flowgraph: usrp\_source—\>\>probe\_mag\_squared\_block----\>block2—\>block3 What I want to do is that I want to bypass the “work” function of block2 when the threshold level of probe\_mag\_squared reaches. I do… --- ## [CMA Equalizer error](https://www.ruby-forum.com/t/cma-equalizer-error/232094)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 26, 2014, 6:00am UTC](https://www.ruby-forum.com/t/cma-equalizer-error/232094 "2014-09-26T06:00:54Z")
Hi, I am trying the CMA equalizer of gnuradio and for understanding I am studying the reference paper mentioned in the doc as well. I have a question after going through the code- Why the real and imag part of the er… --- ## [DSRC demodulation with gr-ieee802\_11](https://www.ruby-forum.com/t/dsrc-demodulation-with-gr-ieee802-11/234826)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 11\ **Last updated:** [September 25, 2014, 7:57pm UTC](https://www.ruby-forum.com/t/dsrc-demodulation-with-gr-ieee802-11/234826 "2014-09-25T19:57:07Z")
I’m new to Gnu Radio but I’m asked to demodulate a DSRC signal and I don’t know how handle that. DSRC is used in Intelligent Vehicule Systems, it is modulated with OFDM int the 5.9Hz band and is based on the IEEE 802… --- ## [Stop() and wait() on topblock does not work on OS X](https://www.ruby-forum.com/t/stop-and-wait-on-topblock-does-not-work-on-os-x/232113)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 13\ **Last updated:** [September 25, 2014, 7:53pm UTC](https://www.ruby-forum.com/t/stop-and-wait-on-topblock-does-not-work-on-os-x/232113 "2014-09-25T19:53:17Z")
Hi, my C++ program is already working great, except one major bug on OS X: I cannot stop the flowgraph: When I call on the top block: gr\_tb-\>stop(); gr\_tb-\>wait(); It will hang on the wait. That means the program ca… --- ## [DAB - Help](https://www.ruby-forum.com/t/dab-help/232213)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 25, 2014, 7:36pm UTC](https://www.ruby-forum.com/t/dab-help/232213 "2014-09-25T19:36:45Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Possible bug in keep\_m\_in\_n and patch](https://www.ruby-forum.com/t/possible-bug-in-keep-m-in-n-and-patch/232203)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 25, 2014, 4:59pm UTC](https://www.ruby-forum.com/t/possible-bug-in-keep-m-in-n-and-patch/232203 "2014-09-25T16:59:56Z")
Dear all, I checked the keep\_m\_in\_n block and found a possible bug in it. In the work function, the code wrote: consume\_each(d\_n); return d\_m; which I think it should be consume\_each(blksd\_n); return blksd\_m. wh… --- ## [Qam\_demod documentation error](https://www.ruby-forum.com/t/qam-demod-documentation-error/232200)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 25, 2014, 3:41pm UTC](https://www.ruby-forum.com/t/qam-demod-documentation-error/232200 "2014-09-25T15:41:05Z")
The documentation for qam\_demod is the documentation for qam\_mod. //\\ark. Aim for brevity while avoiding jargon. ~ Edsger Dijkstra --- ## [How to calculate BER using Phy supported in GNURadio](https://www.ruby-forum.com/t/how-to-calculate-ber-using-phy-supported-in-gnuradio/232210)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 25, 2014, 8:43am UTC](https://www.ruby-forum.com/t/how-to-calculate-ber-using-phy-supported-in-gnuradio/232210 "2014-09-25T08:43:48Z")
Hi all, I am using USRP N210 with Gnuradio. My work is based on the physical layer in benchmark\_tx.py. I need to know how to calculate the BER of the received message. Can anyone help me. Thanks --- ## [Variable doesnt work cycle by cycle](https://www.ruby-forum.com/t/variable-doesnt-work-cycle-by-cycle/232209)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 25, 2014, 4:45am UTC](https://www.ruby-forum.com/t/variable-doesnt-work-cycle-by-cycle/232209 "2014-09-25T04:45:17Z")
I’m having problem with my first created OutOfTree block in gnuradio with the command “gr\_modtool.py add -t general -l python”. As a first trial, I wanted to have an output signal that toggle every cycle. In the gnu r… --- ## [How do you improve a spectrum analysis on a USRP1?](https://www.ruby-forum.com/t/how-do-you-improve-a-spectrum-analysis-on-a-usrp1/232205)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 24, 2014, 10:26pm UTC](https://www.ruby-forum.com/t/how-do-you-improve-a-spectrum-analysis-on-a-usrp1/232205 "2014-09-24T22:26:11Z")
I am using GNURadio with a USRP1 and would like some clarity on how the USRP1 works because I’m new to both. Because of the limited speeds of USB transmission, the USRP1 cant efficiently perform a spectrum analysis. S… --- ## [Gnuradio send and receive](https://www.ruby-forum.com/t/gnuradio-send-and-receive/232204)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 24, 2014, 9:54pm UTC](https://www.ruby-forum.com/t/gnuradio-send-and-receive/232204 "2014-09-24T21:54:13Z")
Hi! Is there any way to implement a protocol which could do this following work: 1, first send out some packets , 2, then listen the channel, waiting for incoming packets, 3, after receiving several packets, transmi… --- ## [Installing a gr module which is compatible with GNURadio 3.3.0](https://www.ruby-forum.com/t/installing-a-gr-module-which-is-compatible-with-gnuradio-3-3-0/232201)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 24, 2014, 8:14pm UTC](https://www.ruby-forum.com/t/installing-a-gr-module-which-is-compatible-with-gnuradio-3-3-0/232201 "2014-09-24T20:14:21Z")
Hello all, I have a gr module that was built using GNURadio 3.3.0. I have to run it and experiment with it. I am facing the following problems. PS : GNURadio 3.3.0 had a different architecture, which was gnuradio-cor… --- ## [Where is the modulation in Modulation\_utils](https://www.ruby-forum.com/t/where-is-the-modulation-in-modulation-utils/232198)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 24, 2014, 6:54pm UTC](https://www.ruby-forum.com/t/where-is-the-modulation-in-modulation-utils/232198 "2014-09-24T18:54:52Z")
Hi all, I am really confused. I opened the modulation\_utils and I cannot figure out how the modulation part is performed, it is just an empty curly braces. \_type\_1\_modulators = {} def type\_1\_mods(): return \_type\_1\_… --- ## [Several updates on gr-trellis examples waiting to be merged](https://www.ruby-forum.com/t/several-updates-on-gr-trellis-examples-waiting-to-be-merged/232195)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 24, 2014, 4:58pm UTC](https://www.ruby-forum.com/t/several-updates-on-gr-trellis-examples-waiting-to-be-merged/232195 "2014-09-24T16:58:39Z")
Hi all, I have made several updates to the gr-trellis examples (adding options etc). They are here: under branch “trelllisupdates” I hope they’ll get merged to the master branch soon. Please let me know if there a… --- ## [Re: inserting code into top\_block.py](https://www.ruby-forum.com/t/re-inserting-code-into-top-block-py/232196)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 24, 2014, 4:31pm UTC](https://www.ruby-forum.com/t/re-inserting-code-into-top-block-py/232196 "2014-09-24T16:31:45Z")
Hey All, Thanks for the leads and advice. Ryan Shouldn’t he “cut” the code? Jeff want to have this same functionality without altering the gnuradio Virginia http://www.vt.edu/ Polytechnic Institute and State … --- ## [Benchmark\_rx.py problem](https://www.ruby-forum.com/t/benchmark-rx-py-problem/232177)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 24, 2014, 3:19pm UTC](https://www.ruby-forum.com/t/benchmark-rx-py-problem/232177 "2014-09-24T15:19:30Z")
Hello, I’m trying to find packet loss in a real communication. I’m working with USRP N210, and I’d like to transmit and receive with benchmark\_tx.py and benchmark\_rx.py in OFDM mod. At the transmitter, using ./bench… --- ## [Issue with deinterleave block from a file source to USRP sink with x300](https://www.ruby-forum.com/t/issue-with-deinterleave-block-from-a-file-source-to-usrp-sink-with-x300/232138)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [September 24, 2014, 11:24am UTC](https://www.ruby-forum.com/t/issue-with-deinterleave-block-from-a-file-source-to-usrp-sink-with-x300/232138 "2014-09-24T11:24:41Z")
Hello, I have the following setup: a file source, a deinterleave block and a USRP sink (see the attached .grc and related .png). This setup is a test to distribute two different signals on two channels of the USRP x30… --- ## [ADS-B on Mac 10.9 - possible linking error](https://www.ruby-forum.com/t/ads-b-on-mac-10-9-possible-linking-error/232179)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 24, 2014, 3:31am UTC](https://www.ruby-forum.com/t/ads-b-on-mac-10-9-possible-linking-error/232179 "2014-09-24T03:31:29Z")
Hi I am trying to build and use gr\_air\_modes built from GitHub - bistromath/gr-air-modes: Gnuradio Mode-S/ADS-B radio. But the command sudo ldconfig is not available on Mac 10.9.5. When I execute the modes\_rx comma… --- ## [Inserting code into top\_block.py](https://www.ruby-forum.com/t/inserting-code-into-top-block-py/232186)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [September 24, 2014, 2:21am UTC](https://www.ruby-forum.com/t/inserting-code-into-top-block-py/232186 "2014-09-24T02:21:03Z")
Hey All, I’m trying to figure out if what I want to do is possible in GNU Radio Companion or if there’s a better way to achieve this functionality. I have some code that I want to execute after all the blocks and con… --- ## [Re: Problems building GNURadio](https://www.ruby-forum.com/t/re-problems-building-gnuradio/232134)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 13\ **Last updated:** [September 23, 2014, 3:11am UTC](https://www.ruby-forum.com/t/re-problems-building-gnuradio/232134 "2014-09-23T03:11:54Z")
This URL might help: https://labs.mwrinfosecurity.com/blog/2014/06/18/beaglebone-black-gnu-radio-and-hackrf-one/ Have you tried disabling NEON? Mike – Mike J. M0MIK BSc MIET Ettus R. Technical Support Email: remov… --- ## [USRPN210 and Matlab problem in running the QPSK demo](https://www.ruby-forum.com/t/usrpn210-and-matlab-problem-in-running-the-qpsk-demo/214386)
**Author:** [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Replies:** 1\ **Last updated:** [September 22, 2014, 5:27pm UTC](https://www.ruby-forum.com/t/usrpn210-and-matlab-problem-in-running-the-qpsk-demo/214386 "2014-09-22T17:27:55Z")
Dear all, having struggled for a couple of days with some new N210s I decided to post my problem in here. We recently received two N210s, which I am willing to interface with Matlab since the drivers have now official… --- ## [Fwd: New Defects reported by Coverity Scan for GNURadio](https://www.ruby-forum.com/t/fwd-new-defects-reported-by-coverity-scan-for-gnuradio/234827)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 22, 2014, 4:11pm UTC](https://www.ruby-forum.com/t/fwd-new-defects-reported-by-coverity-scan-for-gnuradio/234827 "2014-09-22T16:11:04Z")
Fix em fast! (Or figure out they are false alarms). Philip -------- Forwarded Message -------- Subject: New Defects reported by Coverity Scan for GNURadio Date: Mon, 22 Sep 2014 00:01:27 -0700 From: removed\_email\_ad… --- ## [Assertion Failure in gr::buffer](https://www.ruby-forum.com/t/assertion-failure-in-gr-buffer/232163)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 22, 2014, 2:36pm UTC](https://www.ruby-forum.com/t/assertion-failure-in-gr-buffer/232163 "2014-09-22T14:36:22Z")
All, I am running a basic PSK Mod block in one GRC flowgraph and another flowgraph with a basic PSK Demod. I am using two URSP N210s, one as transmit, one as receive and GNU Radio 3.7.5, built on Ubuntu with Debuggin… --- ## [\[coproc\] Domains](https://www.ruby-forum.com/t/coproc-domains/232111)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 21, 2014, 8:24pm UTC](https://www.ruby-forum.com/t/coproc-domains/232111 "2014-09-21T20:24:01Z")
Hi, Yesterday during the coproc wg, I wrote this small snippets to illustrate what I meant. It uses C idioms and not C++ ones and I also didn’t consider multiport but hopefully it gets my points accross. And when I… --- ## [Gr-ieee802-11](https://www.ruby-forum.com/t/gr-ieee802-11/232152)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 21, 2014, 9:27am UTC](https://www.ruby-forum.com/t/gr-ieee802-11/232152 "2014-09-21T09:27:19Z")
Hi all, I would like to overcome a limitation of gr-ieee802-11, which is due to the fact it must copy a fixed amount of samples in the ofdm\_sync\_short block; the consequence of this is that is non possible to capture … --- ## [Re: Problems building GNURadio](https://www.ruby-forum.com/t/re-problems-building-gnuradio/232132)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 19, 2014, 5:46pm UTC](https://www.ruby-forum.com/t/re-problems-building-gnuradio/232132 "2014-09-19T17:46:18Z")
I’m refreshing this one since I have a very similar problem. I’m trying to build gr on BeagleBone Black, which is also an ARMv7. I’m using the build-gnuradio script. Linking CXX executable test\_all libvolk.so.0.0.0… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=50) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=52)