# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=22 [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:** 23 --- ## [Gr-osmosdr failed](https://www.ruby-forum.com/t/gr-osmosdr-failed/241990)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 19, 2015, 11:49am UTC](https://www.ruby-forum.com/t/gr-osmosdr-failed/241990 "2015-05-19T11:49:57Z")
hi i am use ubuntu 12.04 and installing gnuradio from source with thith this command wget http://www.sbrac.org/files/build-gnuradio && chmod a+x ./build-gnuradio && ./build-gnuradio --verbose bbladeRF\_test\_rx\_discont… --- ## [QT object sizing](https://www.ruby-forum.com/t/qt-object-sizing/241985)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 18, 2015, 9:35pm UTC](https://www.ruby-forum.com/t/qt-object-sizing/241985 "2015-05-18T21:35:15Z")
I have a flowgraph that includes a couple of sliders and a frequency display below. On a fairly low-res screen (1280x1024), I’m seeing that the flowchart GUI is fitting itself to the size of the screen, but the indivi… --- ## [GNU radio with 1 - qa\_test\_all failed](https://www.ruby-forum.com/t/gnu-radio-with-1-qa-test-all-failed/241946)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 18, 2015, 7:16pm UTC](https://www.ruby-forum.com/t/gnu-radio-with-1-qa-test-all-failed/241946 "2015-05-18T19:16:12Z")
Hello all I am installing GNUradio in two boards, one is Odroid XU3, with Ubuntu 14.04 system. The other one is Hummingboard i2ex with Debian Jessie system. I build from source with version 3.7.8 in git. Both boards … --- ## [QT Freq Sink Display not centering correctly?](https://www.ruby-forum.com/t/qt-freq-sink-display-not-centering-correctly/241962)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 18, 2015, 5:38pm UTC](https://www.ruby-forum.com/t/qt-freq-sink-display-not-centering-correctly/241962 "2015-05-18T17:38:37Z")
So, I first noticed this problem with my main GNURadio install (3.7.5 on Debian Jessie) but I’ve reproduced it on a brand new 3.7.7.1 live USB. Basically I’m looking at two frequency sinks. One of them centered at 0 a… --- ## [Problem TCP blocks](https://www.ruby-forum.com/t/problem-tcp-blocks/241920)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 18, 2015, 3:22pm UTC](https://www.ruby-forum.com/t/problem-tcp-blocks/241920 "2015-05-18T15:22:29Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: Which blocks do you like?](https://www.ruby-forum.com/t/re-which-blocks-do-you-like/241978)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 18, 2015, 12:42pm UTC](https://www.ruby-forum.com/t/re-which-blocks-do-you-like/241978 "2015-05-18T12:42:59Z")
For the bug, wouldn’t be sufficient to substiture the above code // Find the magnitude squared of the correlation std::vector corr\_mag(noutput\_items); volk\_32fc\_magnitude\_squared\_32f(&corr\_mag\[0\], corr, noutput\_items… --- ## [Re: Which blocks do you like?](https://www.ruby-forum.com/t/re-which-blocks-do-you-like/241972)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 18, 2015, 9:53am UTC](https://www.ruby-forum.com/t/re-which-blocks-do-you-like/241972 "2015-05-18T09:53:34Z")
@Ron E.: Thanks for your reply.I’ve looked about the code.I think that maybe I’ll implement it in the future,but not now: is too specific to a single application @Marcus Müller:I’ve looked about correlate\_and\_sync me… --- ## [Dtv-questions](https://www.ruby-forum.com/t/dtv-questions/241969)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [May 18, 2015, 8:58am UTC](https://www.ruby-forum.com/t/dtv-questions/241969 "2015-05-18T08:58:05Z")
Hi, when playing with DVB-T2, I see there are example ts files of different size, somehow optimized for the transmission mode, 4k or 8k, 64QAM or 256QAM. Now when I have a look at them with my recoding software, they… --- ## [Problems when trying to make out of tree modules](https://www.ruby-forum.com/t/problems-when-trying-to-make-out-of-tree-modules/241934)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [May 16, 2015, 8:12pm UTC](https://www.ruby-forum.com/t/problems-when-trying-to-make-out-of-tree-modules/241934 "2015-05-16T20:12:19Z")
Dear All, I am trying to make an out of tree module by following the tutorial on Gnu radio website. I can write simple blocks in C++, compile it and install it to it usable in Gnuradio company. But for some complex… --- ## [GNU Radio Release 3.7.7.1 and Live SDR Environment is available for download](https://www.ruby-forum.com/t/gnu-radio-release-3-7-7-1-and-live-sdr-environment-is-available-for-download/241954)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 16, 2015, 5:25pm UTC](https://www.ruby-forum.com/t/gnu-radio-release-3-7-7-1-and-live-sdr-environment-is-available-for-download/241954 "2015-05-16T17:25:15Z")
GNU Radio release 3.7.7.1 is available for download: http://gnuradio.org/releases/gnuradio/gnuradio-3.7.7.1.tar.gz GNU Radio Live SDR Environment: http://s3-dist.gnuradio.org/ubuntu-14.04.2-desktop-amd64-gnuradio-3.7.… --- ## [Packet Encoder Issue](https://www.ruby-forum.com/t/packet-encoder-issue/241979)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 16, 2015, 9:22am UTC](https://www.ruby-forum.com/t/packet-encoder-issue/241979 "2015-05-16T09:22:09Z")
Hi, I was checking the code of the packet encoder to see how it works. Whatever preamble and access code i gave i could successfully obtain them back. But i couldn’t figure how the data is being encoded. Can anyone… --- ## [Scrambler Mask, Seed and Lenght](https://www.ruby-forum.com/t/scrambler-mask-seed-and-lenght/241952)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 15, 2015, 3:20pm UTC](https://www.ruby-forum.com/t/scrambler-mask-seed-and-lenght/241952 "2015-05-15T15:20:49Z")
Hi, the default values for the parameters of the scrambler block are the following: Mask: 0x8A Seed: 0x7F length:7 Is this a 7-bit scrambler? If yes, why the mask corresponds to an 8-bit number? (0x8A = ‘10001010’… --- ## [(Previously working) AttributeError: 'module' object has no attribute](https://www.ruby-forum.com/t/previously-working-attributeerror-module-object-has-no-attribute/241949)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 15, 2015, 1:40pm UTC](https://www.ruby-forum.com/t/previously-working-attributeerror-module-object-has-no-attribute/241949 "2015-05-15T13:40:55Z")
Hello all, I was woking debuging an error that appear in my application, and in order to do that I intended to create a really simple block that basically just connected the output with the input as a bypass, and th… --- ## [How to add RTL\_SDR into 3.7.8 gnuradio library?](https://www.ruby-forum.com/t/how-to-add-rtl-sdr-into-3-7-8-gnuradio-library/241947)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 15, 2015, 10:40am UTC](https://www.ruby-forum.com/t/how-to-add-rtl-sdr-into-3-7-8-gnuradio-library/241947 "2015-05-15T10:40:24Z")
Hello all I installed the latest version 3.7.8 of gnuradio from source. But the repository removed rtl\_sdr folder from the source files. I google a way to add rtl-sdr to the library. but it did not work for me. I fo… --- ## [SRIF 2015 deadline extension](https://www.ruby-forum.com/t/srif-2015-deadline-extension/241950)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 15, 2015, 12:21am UTC](https://www.ruby-forum.com/t/srif-2015-deadline-extension/241950 "2015-05-15T00:21:46Z")
For everyone working on papers for SRIF, I wanted to let you all know that we’re extending the deadline until next Friday. Please see the updated info on the workshop’s website: http://srif.seas.upenn.edu/ Thanks! … --- ## [MANET using USRPs](https://www.ruby-forum.com/t/manet-using-usrps/241939)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 14, 2015, 3:03pm UTC](https://www.ruby-forum.com/t/manet-using-usrps/241939 "2015-05-14T15:03:14Z")
I need to implement a MANET sensor network and would like to be able to use the USRP units that we have on hand for this. Presently we have a bunch of N210 and B210 units. What I am after if an adhoc mesh network c… --- ## [UHD USRP Source for B2x0 overflows File Sink](https://www.ruby-forum.com/t/uhd-usrp-source-for-b2x0-overflows-file-sink/241877)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 15\ **Last updated:** [May 13, 2015, 10:47pm UTC](https://www.ruby-forum.com/t/uhd-usrp-source-for-b2x0-overflows-file-sink/241877 "2015-05-13T22:47:39Z")
How would I best set up a UHD Source block for USRP B2x0 devices to output to a flowgraph that uses a File Sink block to write to disk without overflows (and how would I best set up the File Sink block)? This is the a… --- ## [How to control latency](https://www.ruby-forum.com/t/how-to-control-latency/241351)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [May 13, 2015, 8:52pm UTC](https://www.ruby-forum.com/t/how-to-control-latency/241351 "2015-05-13T20:52:34Z")
Hello, I have a system where I acquire a signal through an Ettus N210 at 200 kHz and I process it through a few GNURadio blocks. Those blocks include a first low pass filtering and decimation to 1 kHz sampling rate an… --- ## [Announcing NEWSDR at WPI on Thr/Fri May 21/22 (Next Week)](https://www.ruby-forum.com/t/announcing-newsdr-at-wpi-on-thr-fri-may-21-22-next-week/241933)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 13, 2015, 5:59pm UTC](https://www.ruby-forum.com/t/announcing-newsdr-at-wpi-on-thr-fri-may-21-22-next-week/241933 "2015-05-13T17:59:04Z")
NEWSDR 2015 \* \* New England Workshop on Software-Defined Radio \* … --- ## [Openbts n200 usrp](https://www.ruby-forum.com/t/openbts-n200-usrp/241932)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 13, 2015, 5:32pm UTC](https://www.ruby-forum.com/t/openbts-n200-usrp/241932 "2015-05-13T17:32:27Z")
Hello all, I can ping 192.168.10.2, but uhd\_find\_devices shows No UHD Devices Found. My device is USRP N200 and both gnuradio and uhd are installed in the Ubuntu 12.04. Do anyone have the same question? Cou… --- ## [No change when set\_processor affinity() is used](https://www.ruby-forum.com/t/no-change-when-set-processor-affinity-is-used/241925)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [May 12, 2015, 10:15pm UTC](https://www.ruby-forum.com/t/no-change-when-set-processor-affinity-is-used/241925 "2015-05-12T22:15:29Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Question on control-loop block design](https://www.ruby-forum.com/t/question-on-control-loop-block-design/241750)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [May 12, 2015, 9:13am UTC](https://www.ruby-forum.com/t/question-on-control-loop-block-design/241750 "2015-05-12T09:13:46Z")
Hello, I’ve been looking into the design details of the control-loop block. I stumbled upon the blog post of Tom (Control Loop Gain Values — Rondeau Research with the derivation https://static.squarespace.com/static… --- ## [Transition to new digtal TV blocks](https://www.ruby-forum.com/t/transition-to-new-digtal-tv-blocks/241910)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 11, 2015, 3:40pm UTC](https://www.ruby-forum.com/t/transition-to-new-digtal-tv-blocks/241910 "2015-05-11T15:40:57Z")
Hi, Maybe a dumb question, but up to now I was using gr-dvbt2 downloaded as source, compiled and installed. Now gnuradio brings this stuff by default. So I wonder what may happen when I remove the duplicate blocks fr… --- ## [Question about ofdm\_sync\_long block of gr-ieee802-11 module](https://www.ruby-forum.com/t/question-about-ofdm-sync-long-block-of-gr-ieee802-11-module/241896)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 11, 2015, 6:31am UTC](https://www.ruby-forum.com/t/question-about-ofdm-sync-long-block-of-gr-ieee802-11-module/241896 "2015-05-11T06:31:13Z")
I am looking gr-ieee802-11 module. a part of the source code is pasted here ( https://gist.github.com/gsongsong/3df4553fe96e2d62b83e) I have a question on the following statement: if(rel \>= 0 && (rel \< 128 || ((rel -… --- ## [GNU Radio for Android](https://www.ruby-forum.com/t/gnu-radio-for-android/241855)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [May 11, 2015, 2:42am UTC](https://www.ruby-forum.com/t/gnu-radio-for-android/241855 "2015-05-11T02:42:14Z")
While I have been talking around it for a while, I wanted to better publicize our work on GNU Radio for Android. We can now build applications that run GNU Radio flowgraphs on Android (\>= 5.0). We build the flowgraph … --- ## [IEEE Access (free) article on 60 GHz T/R converter for USRP](https://www.ruby-forum.com/t/ieee-access-free-article-on-60-ghz-t-r-converter-for-usrp/241897)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [May 10, 2015, 5:41pm UTC](https://www.ruby-forum.com/t/ieee-access-free-article-on-60-ghz-t-r-converter-for-usrp/241897 "2015-05-10T17:41:17Z")
An article has been published in IEEE Access (free, open access IEEE publication) on a 60 GHz front-end for USRP N2000/N210. There’s a video on the abstract page, and a link to the pdf of the article. the video demon… --- ## [I & Q samples in a source module](https://www.ruby-forum.com/t/i-q-samples-in-a-source-module/241893)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 10, 2015, 11:35am UTC](https://www.ruby-forum.com/t/i-q-samples-in-a-source-module/241893 "2015-05-10T11:35:36Z")
My source modules has 16-bit I & Q samples that are interleaved: I,Q,I,Q,I,Q… as signed 16 bit values. I generate 512 pairs at a time in my work function (C++). I set noutput\_items to 512 and copy I and Q out 512… --- ## [Require help with synchronisation (using USRPs)](https://www.ruby-forum.com/t/require-help-with-synchronisation-using-usrps/241890)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 8, 2015, 11:06pm UTC](https://www.ruby-forum.com/t/require-help-with-synchronisation-using-usrps/241890 "2015-05-08T23:06:53Z")
Hello I am implementing time synchronisation in OFDM tx-rx. In my matlab simulations I manually chose a start point in the receive signal which was not the first sample. And then I assumed that I don’t know what that … --- ## [File Sink Behavior](https://www.ruby-forum.com/t/file-sink-behavior/241887)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 8, 2015, 7:56pm UTC](https://www.ruby-forum.com/t/file-sink-behavior/241887 "2015-05-08T19:56:06Z")
I’m testing a radio by sending known data through from a file source, and file sinking the data at the end of the Tx/Rx loopback chain. I’m getting very specific erratic behavior with the contents of the output file.… --- ## [Points in scope sink are missing when zooming in and out](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 8, 2015, 2:54pm UTC](https://www.ruby-forum.com/t/points-in-scope-sink-are-missing-when-zooming-in-and-out/241882 "2015-05-08T14:54:39Z")
For debugging or other purposes, sometimes I use time domain scope sink. When I zoom in and out, points in the scope are missing. For instance, flow graph generates a stream: 1111111111000000000011111111110000000000 (… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=21) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=23)