# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=37 [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:** 38 --- ## [Re: gr-cdma](https://www.ruby-forum.com/t/re-gr-cdma/233943)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [January 30, 2015, 12:34pm UTC](https://www.ruby-forum.com/t/re-gr-cdma/233943 "2015-01-30T12:34:48Z")
The beautiful thing about open source is that all the detail are there for you to see! Looking at the cdma\_parameters.py file, you can see: pulse\_training = numpy.array((1,1,1,1,-1,1,1,-1))+0j pulse\_data =numpy.arr… --- ## [USRP B200 host BW with USB 3.0/2.0](https://www.ruby-forum.com/t/usrp-b200-host-bw-with-usb-3-0-2-0/233994)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [January 30, 2015, 7:56am UTC](https://www.ruby-forum.com/t/usrp-b200-host-bw-with-usb-3-0-2-0/233994 "2015-01-30T07:56:42Z")
I understand the given values of host bandwidth for each protocol: USB 2.0 8 (MS/s @ 16-bit I/Q) USB 3.0 61.44 (MS/s @ 16-bit I/Q) However I would like to process 40MHz of analogue BW i… --- ## [\[coproc\] Scheduling next CoProc WG Call](https://www.ruby-forum.com/t/coproc-scheduling-next-coproc-wg-call/234003)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 29, 2015, 8:27pm UTC](https://www.ruby-forum.com/t/coproc-scheduling-next-coproc-wg-call/234003 "2015-01-29T20:27:28Z")
I’ve been a bit slow about organizing the first working group call of 2015, so let’s get things rolling: I’ve selected a couple times in early Feb., and for those that are interested in helping to close out the outst… --- ## [Issue with Results from GR-CDMA](https://www.ruby-forum.com/t/issue-with-results-from-gr-cdma/234005)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 29, 2015, 6:10pm UTC](https://www.ruby-forum.com/t/issue-with-results-from-gr-cdma/234005 "2015-01-29T18:10:06Z")
Hello sorry for the last message thought i attached my screenshot results at first. I am having some problems as to whether the information from the cdma transmission and reception are accurate. I have posted my scree… --- ## [QTGUI Issue](https://www.ruby-forum.com/t/qtgui-issue/233967)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 15\ **Last updated:** [January 29, 2015, 10:50am UTC](https://www.ruby-forum.com/t/qtgui-issue/233967 "2015-01-29T10:50:46Z")
Problem: I can’t use qtgui blocks. Wxgui blocks work. My system is CentOS 6.6 running gnuradio 3.7.6 installed using pybombs. Debug: I’ve run cmake in pybombs/gnuradio/src/build to make sure qtgui was enabled during … --- ## [Help](https://www.ruby-forum.com/t/help/233969)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 29, 2015, 10:43am UTC](https://www.ruby-forum.com/t/help/233969 "2015-01-29T10:43:17Z")
dear all members of milist i have tried to build aistx module using gr-moodtool, i got the source from github where using gnuradio 3.6 and i have modified to gnuradio 3.7 as instruction in http://gnuradio.org/redmin… --- ## [Link error](https://www.ruby-forum.com/t/link-error/233973)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 28, 2015, 4:06pm UTC](https://www.ruby-forum.com/t/link-error/233973 "2015-01-28T16:06:30Z")
Hi all: Thank you in advance. I have use the tool “gr\_modtool” to create a cpp document.But an error exists: ImportError: /usr/local/lib/libgnuradio-mimo.so: undefined symbol: \_ZTIN2gr4mimo21csi\_int\_cfo\_vcvc\_implE … --- ## [Re: log POWER FFT Output - Samples flipped in frequency](https://www.ruby-forum.com/t/re-log-power-fft-output-samples-flipped-in-frequency/233980)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 28, 2015, 2:29pm UTC](https://www.ruby-forum.com/t/re-log-power-fft-output-samples-flipped-in-frequency/233980 "2015-01-28T14:29:08Z")
Hello, I guess it shouldn’t be very difficult to change in order to get the output is from -BW/2 to BW/2 instead of \[DC BW/2 + -BW/2 DC\]. Should I modify my python flowgraph or my “log POWER FFT” hier block? I just … --- ## [Link error](https://www.ruby-forum.com/t/link-error/233974)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 28, 2015, 10:12am UTC](https://www.ruby-forum.com/t/link-error/233974 "2015-01-28T10:12:35Z")
Hi all: Thank you in advance. I have use the tool “gr\_modtool” to create a cpp document.But an error exists: ImportError: /usr/local/lib/libgnuradio-mimo.so: undefined symbol: \_ZTIN2gr4mimo21csi\_int\_cfo\_vcvc\_implE … --- ## [B210 two-channel operation](https://www.ruby-forum.com/t/b210-two-channel-operation/233977)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 27, 2015, 8:34pm UTC](https://www.ruby-forum.com/t/b210-two-channel-operation/233977 "2015-01-27T20:34:56Z")
Hello, OS: Ubuntu 14.01.1 gnu-radio: 3.7.6 Dell Optiplex 765 I am having trouble using the B210 USRP in two channel mode. Things work well when I use grc to configure the B210 with one channel, but when I try usin… --- ## [High Precision ISM Band Spectrum Recording with USRP N210](https://www.ruby-forum.com/t/high-precision-ism-band-spectrum-recording-with-usrp-n210/233972)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 27, 2015, 4:08pm UTC](https://www.ruby-forum.com/t/high-precision-ism-band-spectrum-recording-with-usrp-n210/233972 "2015-01-27T16:08:20Z")
Hi All, I have a USRP N210 with RFX2400 2.3-2.9GHZ RX/TX. I want to view the ISM Spectrum band from 2.40GHz - 2.48Ghz. Record it with a very high precision. I have the following doubts : Which port the antenna sho… --- ## [Pybomb targets that failed to build and install out of the box on ubuntu 14.04 with all requirements](https://www.ruby-forum.com/t/pybomb-targets-that-failed-to-build-and-install-out-of-the-box-on-ubuntu-14-04-with-all-requirements/233976)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 27, 2015, 4:05pm UTC](https://www.ruby-forum.com/t/pybomb-targets-that-failed-to-build-and-install-out-of-the-box-on-ubuntu-14-04-with-all-requirements/233976 "2015-01-27T16:05:38Z")
Hi, I have been trying to install all pybombs targets on ubuntu 14.04 amd64 with the followiing result. Pybomb targets that failed to build and install out of the box on ubuntu 14.04 with all requirements (base) inst… --- ## [Example of DMR receiver](https://www.ruby-forum.com/t/example-of-dmr-receiver/233963)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 27, 2015, 10:39am UTC](https://www.ruby-forum.com/t/example-of-dmr-receiver/233963 "2015-01-27T10:39:42Z")
Hello, My first touch to the Gnu Radio happened this weekend. I managed to listen a local FM repeater but building a DMR receiver was too tough. Please, could someone send me a simple working DMR receiver file (\*.grc… --- ## [FOSDEM Help](https://www.ruby-forum.com/t/fosdem-help/233970)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 27, 2015, 9:36am UTC](https://www.ruby-forum.com/t/fosdem-help/233970 "2015-01-27T09:36:20Z")
We are looking for a couple of volunteers to help with the SDR devroom video taping. We’ll need you from 0830 on Sunday through the end of the day to help with the equipment and make sure everything runs smoothly. Als… --- ## [Changing the IP of USRP2](https://www.ruby-forum.com/t/changing-the-ip-of-usrp2/233937)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 26, 2015, 7:44pm UTC](https://www.ruby-forum.com/t/changing-the-ip-of-usrp2/233937 "2015-01-26T19:44:11Z")
Hi All, I am a newbee to grc and USRP. I need some help regarding changing the IP address of the USRP. I checked the previous threads on this discussion and searched a bit to do this, but couldn’t get it working. M… --- ## [Fwd: New Defects reported by Coverity Scan for GNURadio](https://www.ruby-forum.com/t/fwd-new-defects-reported-by-coverity-scan-for-gnuradio/233959)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 26, 2015, 6:01pm UTC](https://www.ruby-forum.com/t/fwd-new-defects-reported-by-coverity-scan-for-gnuradio/233959 "2015-01-26T18:01:43Z")
FYI. -------- Forwarded Message -------- Subject: New Defects reported by Coverity Scan for GNURadio Date: Sun, 25 Jan 2015 23:13:10 -0800 From: removed\_email\_address@domain.invalid To: removed\_email\_address@domain.… --- ## [Help to get control over USRP from custom block](https://www.ruby-forum.com/t/help-to-get-control-over-usrp-from-custom-block/233961)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 26, 2015, 12:55pm UTC](https://www.ruby-forum.com/t/help-to-get-control-over-usrp-from-custom-block/233961 "2015-01-26T12:55:34Z")
Hi all, A last attempt this time, after struggling already several months with this subject… From within my custom (out-of-tree) C++ block I need full control over USRP sink/source. According to the documentation, th… --- ## [R: Re: THESIS with CUDA](https://www.ruby-forum.com/t/r-re-thesis-with-cuda/233955)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 25, 2015, 6:55pm UTC](https://www.ruby-forum.com/t/r-re-thesis-with-cuda/233955 "2015-01-25T18:55:07Z")
Thanks for your response. FYI, there have been quite a few projects using GPPs in the past. I recommend going through the slides from all of the GRCons, you’ll find something there (at the very least from the first G… --- ## [THESIS with CUDA](https://www.ruby-forum.com/t/thesis-with-cuda/233953)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 25, 2015, 6:30pm UTC](https://www.ruby-forum.com/t/thesis-with-cuda/233953 "2015-01-25T18:30:13Z")
Hi everybody,I’m a student who is completing his master degree of computeer engineering (now I’m at UPC-Barcelona, but before I’ve studied at polytechnic of Turin,Italy).For my thesis, one of my possible idea is to br… --- ## [ImportError: libgnuradio-foo.so: cannot open shared object file: No such file or directory](https://www.ruby-forum.com/t/importerror-libgnuradio-foo-so-cannot-open-shared-object-file-no-such-file-or-directory/233950)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 24, 2015, 9:05am UTC](https://www.ruby-forum.com/t/importerror-libgnuradio-foo-so-cannot-open-shared-object-file-no-such-file-or-directory/233950 "2015-01-24T09:05:55Z")
Hello G.s I am trying to implement 802.15.4. I had taken the files from this website GitHub - bastibl/gr-ieee802-15-4: IEEE 802.15.4 ZigBee Transceiver. My error was ImportError: libgnuradio-foo.so: cannot open shared… --- ## [Ofdm\_chanest\_vcvc\_impl.cc](https://www.ruby-forum.com/t/ofdm-chanest-vcvc-impl-cc/233949)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 24, 2015, 8:52am UTC](https://www.ruby-forum.com/t/ofdm-chanest-vcvc-impl-cc/233949 "2015-01-24T08:52:56Z")
Hi all: Thank you in advance.I have read the source code:ofdm\_chanest\_vcvc\_impl.cc.But i have a question. void ofdm\_chanest\_vcvc\_impl::get\_chan\_taps( const gr\_complex \*sync\_sym1, const gr\_complex \*sync\_sym2, int carr\_… --- ## [Hackfest at TU Delft](https://www.ruby-forum.com/t/hackfest-at-tu-delft/233456)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 23, 2015, 8:13pm UTC](https://www.ruby-forum.com/t/hackfest-at-tu-delft/233456 "2015-01-23T20:13:11Z")
Hey everyone, As a reminder to the community, we’re having a hackfest at TU Delft during the last week or January. We still have some room left if there are a few more people out there who think they can make it. Tu… --- ## [Adding EOB when using Vectors](https://www.ruby-forum.com/t/adding-eob-when-using-vectors/233941)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 23, 2015, 7:58pm UTC](https://www.ruby-forum.com/t/adding-eob-when-using-vectors/233941 "2015-01-23T19:58:08Z")
?Dear All, I am trying to use TX\_TIME, SOB, EOB. How do I add the EOB when I am using a vector? The block I have created takes in vector of 47520 samples, i.e. one item, I want to add TX\_TIME and SOB to the first sam… --- ## [Gr-cdma](https://www.ruby-forum.com/t/gr-cdma/233820)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 21\ **Last updated:** [January 23, 2015, 5:19am UTC](https://www.ruby-forum.com/t/gr-cdma/233820 "2015-01-23T05:19:39Z")
Hello I dont understand how to use the gr-cdma. I have installed it via GitHub and am currently looking at the cdma\_tx and cdma\_rx files. I am having problems trying to figure out what I am supposed to be inputting in… --- ## [Am I missing something in the documentation regarding Hier blocks?](https://www.ruby-forum.com/t/am-i-missing-something-in-the-documentation-regarding-hier-blocks/233926)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 22, 2015, 9:30pm UTC](https://www.ruby-forum.com/t/am-i-missing-something-in-the-documentation-regarding-hier-blocks/233926 "2015-01-22T21:30:26Z")
I have a bunch of hier blocks I’m trying to use. Despite have the python and xml related to the block in ~/.grc-gnuradio I keep getting an error that the hier block does not exist, and clicking on the block and click… --- ## [Important update](https://www.ruby-forum.com/t/important-update/231457)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 22, 2015, 4:52pm UTC](https://www.ruby-forum.com/t/important-update/231457 "2015-01-22T16:52:53Z")
I want to warn everyone of a significant change in the GNU Radio code base that affects maint, master, and next git branches. We have removed most of the functionality of ControlPort due to a concern over the underly… --- ## [Gnuradio-companion and multithreading](https://www.ruby-forum.com/t/gnuradio-companion-and-multithreading/233913)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 21, 2015, 5:12pm UTC](https://www.ruby-forum.com/t/gnuradio-companion-and-multithreading/233913 "2015-01-21T17:12:20Z")
Hi, iam testing gnuradio-companion editor on the Bananapi LUbuntu. When i am editing a block or drawing a block i recognize in top that the python process has a 100% CPU (i have 2 CPUs) load. The gnuradio-companion e… --- ## [Python pass parameter as const \*gr\_complex?](https://www.ruby-forum.com/t/python-pass-parameter-as-const-gr-complex/233739)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 21, 2015, 4:27pm UTC](https://www.ruby-forum.com/t/python-pass-parameter-as-const-gr-complex/233739 "2015-01-21T16:27:41Z")
Hi list, I am trying to use the gr::digital::constellation::decision\_maker(.) method from python, but I get an error message. In order to reproduce call in python: import gnuradio.digital a = gnuradio.digital.conste… --- ## [Processing of large number of samples](https://www.ruby-forum.com/t/processing-of-large-number-of-samples/233904)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 21, 2015, 12:20pm UTC](https://www.ruby-forum.com/t/processing-of-large-number-of-samples/233904 "2015-01-21T12:20:43Z")
Goodmorning, I have general questions about processing a fixed number of samples. In front of the necessity to process N samples (N=8192 items) in a sinchronous block, I developed a mechanism like this: if(noutput\_i… --- ## [Build a DLL from my GNURadio OOT module with Visual Studio 2013](https://www.ruby-forum.com/t/build-a-dll-from-my-gnuradio-oot-module-with-visual-studio-2013/233878)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 21, 2015, 8:00am UTC](https://www.ruby-forum.com/t/build-a-dll-from-my-gnuradio-oot-module-with-visual-studio-2013/233878 "2015-01-21T08:00:53Z")
Hi all, I get into trouble when trying to build a dll from my GNURadio OOT module with Visual Studio 2013. I really appreciate if you could help me to solve this issue. I have installed: GNURadio (got at http://… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=36) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=38)