# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=35 [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:** 36 --- ## [Pybombs](https://www.ruby-forum.com/t/pybombs/234241)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 18, 2015, 4:06pm UTC](https://www.ruby-forum.com/t/pybombs/234241 "2015-02-18T16:06:01Z")
Hello list Has anyone else has experienced any problems with pybombs: failing to load recipes This is happening when I try to install through ./app\_store.py I am getting this output I have tried several prefixes al… --- ## [PSK.py script giving errors](https://www.ruby-forum.com/t/psk-py-script-giving-errors/234222)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 17, 2015, 10:07pm UTC](https://www.ruby-forum.com/t/psk-py-script-giving-errors/234222 "2015-02-17T22:07:32Z")
Hi All, I am trying to make the following system. Packet Generator ------\> BPSK Modulator --------\> Frequency Hopper ---------------\> UHD Sink I read that the generic block psk.py can be used as a BPSK modulator so … --- ## [Uhd\_fft segfault](https://www.ruby-forum.com/t/uhd-fft-segfault/234218)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [February 17, 2015, 9:05pm UTC](https://www.ruby-forum.com/t/uhd-fft-segfault/234218 "2015-02-17T21:05:19Z")
Hi, I’m new to SDR and gnuradio and trying to get started with an USRP B200 and gnuradio on ubuntu 14.04. I’m using pybombs (up-to-date) for building. Building succeeds but i get a segfault when running uhd\_fft. The… --- ## [Sync\_decimator\_ff block with decimation above 262144 gives segfault](https://www.ruby-forum.com/t/sync-decimator-ff-block-with-decimation-above-262144-gives-segfault/234185)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 17, 2015, 5:35pm UTC](https://www.ruby-forum.com/t/sync-decimator-ff-block-with-decimation-above-262144-gives-segfault/234185 "2015-02-17T17:35:13Z")
Hi all, When I set the decimation of a fir\_filter or integrate block with float input and output to 262144 or above, gnuradio crashes with a segfault. With complex inputs and outputs I get a segfault above 524288. wi… --- ## [AttributeError: 'module' object has no attribute 'hamming'](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-hamming/234200)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [February 17, 2015, 5:24pm UTC](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-hamming/234200 "2015-02-17T17:24:46Z")
Hi , I wrote a Out of Tree module for hamming code using ITPP library . It compiled when i ran the cmake… , make and make install commands without error . I used the block in a flowgraph and the python script thus ge… --- ## [Amplitude settings in uhd\_siggen](https://www.ruby-forum.com/t/amplitude-settings-in-uhd-siggen/234149)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [February 17, 2015, 10:52am UTC](https://www.ruby-forum.com/t/amplitude-settings-in-uhd-siggen/234149 "2015-02-17T10:52:21Z")
In uhd\_siggen\_gui tool, u cant set signal amplitude more than 1. Is there any reason behind this? I commented out the code where the limit checking is done. Then, when I increase the amplitude of the transmitted sign… --- ## [Question for using NI(National Instruments) PXIe-8135 connected NI-USRP-2943R with GNU Radio](https://www.ruby-forum.com/t/question-for-using-ni-national-instruments-pxie-8135-connected-ni-usrp-2943r-with-gnu-radio/234223)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 17, 2015, 2:06am UTC](https://www.ruby-forum.com/t/question-for-using-ni-national-instruments-pxie-8135-connected-ni-usrp-2943r-with-gnu-radio/234223 "2015-02-17T02:06:22Z")
Hello readers. I am very new at using NI-USRP RIO & NI-PXIe. I have some questions for using GNU Radio with NI-PXIe-8135. I know that GNU Radio is very good program for using USRP, but there’s no information about GN… --- ## [Performance diff between Null Sink & Copy Block](https://www.ruby-forum.com/t/performance-diff-between-null-sink-copy-block/234217)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 16, 2015, 9:45pm UTC](https://www.ruby-forum.com/t/performance-diff-between-null-sink-copy-block/234217 "2015-02-16T21:45:04Z")
Hi - I am trying to create optional paths in my Gnuradio Flowgraph. I have found 2 ways of doing this in C++: Doing a lock() / unlock() inside my heir\_block2 and either connecting the items inside the block to the so… --- ## [\[UHD-3.8.2\] Release Announcement](https://www.ruby-forum.com/t/uhd-3-8-2-release-announcement/234219)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 16, 2015, 9:37pm UTC](https://www.ruby-forum.com/t/uhd-3-8-2-release-announcement/234219 "2015-02-16T21:37:32Z")
Everyone, following the release candidate, we have now finished testing, and with some minor tweaks, just tagged the 3.8.2 release. There were some minor changes with respect to the release candidate, mainly minor bug… --- ## [Gnu radio](https://www.ruby-forum.com/t/gnu-radio/234213)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 16, 2015, 10:26am UTC](https://www.ruby-forum.com/t/gnu-radio/234213 "2015-02-16T10:26:33Z")
sir, i dint get the structure of the IMPL code in c++…please explain me …how to create a block that should take parameter from user…give me one simple example thank you --- ## [GSoC](https://www.ruby-forum.com/t/gsoc/234203)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 15, 2015, 2:42pm UTC](https://www.ruby-forum.com/t/gsoc/234203 "2015-02-15T14:42:23Z")
Hello, I am a final year Bachelors student in Computer Science and I am interested in contributing to GNU Radio for GSoC 2015. How should I get started? Thanks for your help. Regards, Anuroop Kuppam --- ## [Documentation for Hier Blocks originating in GRC](https://www.ruby-forum.com/t/documentation-for-hier-blocks-originating-in-grc/234209)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 15, 2015, 3:55am UTC](https://www.ruby-forum.com/t/documentation-for-hier-blocks-originating-in-grc/234209 "2015-02-15T03:55:30Z")
Is there a way to create documentation for hier blocks built in GRC? --- ## [When will the build-gnuradio script be available for Fedora 21?](https://www.ruby-forum.com/t/when-will-the-build-gnuradio-script-be-available-for-fedora-21/234204)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 14, 2015, 6:06pm UTC](https://www.ruby-forum.com/t/when-will-the-build-gnuradio-script-be-available-for-fedora-21/234204 "2015-02-14T18:06:34Z")
I just switched from fedora 20 to fedora 21. When will build-gnuradio be available for fedora 21? Thank You Tom --- ## [Re: Spread Spectrum Toolkit in gnuradio](https://www.ruby-forum.com/t/re-spread-spectrum-toolkit-in-gnuradio/234183)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 12, 2015, 7:21pm UTC](https://www.ruby-forum.com/t/re-spread-spectrum-toolkit-in-gnuradio/234183 "2015-02-12T19:21:18Z")
I don’t know much about this toolkit, but you can find our gr-cdma toolkit on github. It is a full blown (and fully parameterised by the user) cdma system with acquisition/tracking/adaptive modulation/coding, etc. … --- ## [\[coproc\] WG Call notes, and initial design document](https://www.ruby-forum.com/t/coproc-wg-call-notes-and-initial-design-document/234182)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 12, 2015, 6:22pm UTC](https://www.ruby-forum.com/t/coproc-wg-call-notes-and-initial-design-document/234182 "2015-02-12T18:22:44Z")
I’ve posted some notes from the working group call that was held yesterday they are available at: http://gnuradio.org/redmine/projects/gnuradio/wiki/Call20150211 Additionally, the main item that came out of the cal… --- ## [Help needed](https://www.ruby-forum.com/t/help-needed/234165)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 12, 2015, 5:49pm UTC](https://www.ruby-forum.com/t/help-needed/234165 "2015-02-12T17:49:06Z")
I have been using gnurad-companion for some time now but for the last few months I have been getting errors that prevent use. My system is an up to date Mint OS. The version of the application is 3.7.6.1. I am exp… --- ## [Re: Edit GNU Radio Companion generated Python script location](https://www.ruby-forum.com/t/re-edit-gnu-radio-companion-generated-python-script-location/234180)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 12, 2015, 3:56pm UTC](https://www.ruby-forum.com/t/re-edit-gnu-radio-companion-generated-python-script-location/234180 "2015-02-12T15:56:04Z")
Thank you all for looking at this. setting the GRC\_BLOCKS\_PATH and then using grcc works fine for me, but not with the grc companion. Thanks, Murray --- ## [Spread Spectrum Toolkit in gnuradio](https://www.ruby-forum.com/t/spread-spectrum-toolkit-in-gnuradio/234179)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 12, 2015, 3:18pm UTC](https://www.ruby-forum.com/t/spread-spectrum-toolkit-in-gnuradio/234179 "2015-02-12T15:18:26Z")
Hi All, I just came across this talk “Spread Spectrum Techniques in GNU Radio” in GNU Radio Conference ‘14. The presentation ( http://gnuradio.squarespace.com/storage/grcon14/presentations/Sep18\_07\_David\_DSSSFHSS.pdf)… --- ## [Report on university course based on DARPA Spectrum Challenge](https://www.ruby-forum.com/t/report-on-university-course-based-on-darpa-spectrum-challenge/234167)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 12, 2015, 2:51pm UTC](https://www.ruby-forum.com/t/report-on-university-course-based-on-darpa-spectrum-challenge/234167 "2015-02-12T14:51:57Z")
Hi all, I was a participant in the DARPA Spectrum Challenge last year. Inspired by the Challenge, I developed a new course in which students learned about wireless communications and software radio in the context of… --- ## [Edit GNU Radio Companion generated Python script location](https://www.ruby-forum.com/t/edit-gnu-radio-companion-generated-python-script-location/233615)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 12, 2015, 2:40pm UTC](https://www.ruby-forum.com/t/edit-gnu-radio-companion-generated-python-script-location/233615 "2015-02-12T14:40:13Z")
Hi, I have a couple of blocks and a flow graph that uses them. When I generate the flow graph of a block using GNU Radio Companion, the Python script is generated at ~/.grc\_gnuradio/block1.py The same thing happens… --- ## [Understanding the limitations of USRP1](https://www.ruby-forum.com/t/understanding-the-limitations-of-usrp1/234169)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 12, 2015, 10:11am UTC](https://www.ruby-forum.com/t/understanding-the-limitations-of-usrp1/234169 "2015-02-12T10:11:08Z")
I am using a USRP1, and I’m trying to receive FM radio. I’m using a BasicRX daughterboard with a 0-250MHz range. The USRP itself has a LO frequency of 64MHz. Does this limit my frequency range to 0-32MHz, or can I ge… --- ## [Updating with build-gnuradio](https://www.ruby-forum.com/t/updating-with-build-gnuradio/234173)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 12, 2015, 6:00am UTC](https://www.ruby-forum.com/t/updating-with-build-gnuradio/234173 "2015-02-12T06:00:09Z")
Hi All, If you have used build-gnuradio to install gnuradio what is the best solution for upgrading gnu radio or one of the other packages installed. Installed with: ./build-gnuradio -m -e all So if I wanted to upda… --- ## [E310 USRP and APM 2.6](https://www.ruby-forum.com/t/e310-usrp-and-apm-2-6/234172)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 12, 2015, 2:00am UTC](https://www.ruby-forum.com/t/e310-usrp-and-apm-2-6/234172 "2015-02-12T02:00:11Z")
Hi, I am currently working on a school project about capturing cellphone signals flying an autonomous quad copter. The quad copter will find the different signal strength and moving into the direction of the strongest … --- ## [Re: Polyphase Filer examples and Busport Implementation for QT GUI Frequency Sink](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234158)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 11, 2015, 1:41pm UTC](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234158 "2015-02-11T13:41:13Z")
Thanks for the input. So given that the QT GUI Frequency Sync Block seems to have no entry in the Properties GUI to set BusPort Connections, how would one go about doing that. It seems to default to a minimum bus wi… --- ## [Precise interrupts in GNURADIO?](https://www.ruby-forum.com/t/precise-interrupts-in-gnuradio/234146)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 10, 2015, 4:07pm UTC](https://www.ruby-forum.com/t/precise-interrupts-in-gnuradio/234146 "2015-02-10T16:07:21Z")
Dear all, In my application, I want to implement the following feature: 1. If I decode 50 packages, then stop the flowgraph immediately 2. otherwise, if after 30 seconds, I cannot receive more than 50 packages, then … --- ## [Frequency Hopping Transmission with USRP N210 : Query](https://www.ruby-forum.com/t/frequency-hopping-transmission-with-usrp-n210-query/234139)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 9, 2015, 9:09pm UTC](https://www.ruby-forum.com/t/frequency-hopping-transmission-with-usrp-n210-query/234139 "2015-02-09T21:09:35Z")
Hi All, I have a USRP N210 with RFX2400 2.3-2.9 Ghz RX/TX. I have recorded a trace at 2.41 GHz and stored it to a file filename.dat. I want to transmit the same trace at 2.415, 2.420, 2.425 so on till 2.440. So, I u… --- ## [Re: Polyphase Filer examples and Busport Implementation for QT GUI Frequency Sink](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234142)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 9, 2015, 7:58pm UTC](https://www.ruby-forum.com/t/re-polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234142 "2015-02-09T19:58:41Z")
Thanks for the feedback, I’m thinking that this means that in their current state, the QT GUI Frequency Sinks do not properly support BusPorts … If I’ve got this wrong is there some documentation somewhere specific to … --- ## [Grc and wxpython \>=3.0](https://www.ruby-forum.com/t/grc-and-wxpython-3-0/234080)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 9, 2015, 7:35pm UTC](https://www.ruby-forum.com/t/grc-and-wxpython-3-0/234080 "2015-02-09T19:35:34Z")
There are several reports of the wx version of the gnuradio gui not starting with 3.0 and later wxpython. I believe http://trac.wxwidgets.org/ticket/16034 confirms that no upstream fix is planned. I suggest a simple … --- ## [File Meta Sink Endianness?](https://www.ruby-forum.com/t/file-meta-sink-endianness/234140)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 9, 2015, 7:29pm UTC](https://www.ruby-forum.com/t/file-meta-sink-endianness/234140 "2015-02-09T19:29:31Z")
Hello, Can someone tell me what byte order (i.e. little endian or big endian) is used in file meta sink (i.e. what is the byte order of the resulting file)? I’m seeing something strange, and I’m wondering if the hea… --- ## [Simples case of message passing](https://www.ruby-forum.com/t/simples-case-of-message-passing/234122)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 9, 2015, 6:42pm UTC](https://www.ruby-forum.com/t/simples-case-of-message-passing/234122 "2015-02-09T18:42:56Z")
Earlier today, I’ve posted a question on how to do frame detection and extraction in GNU Radio ( http://gnuradio.4.n7.nabble.com/Simple-Frame-Detection-td52233.html). I have a feeling that the best way to accomplish w… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=34) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=36)