# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=28 [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:** 29 --- ## [GNU Radio on Zedboard](https://www.ruby-forum.com/t/gnu-radio-on-zedboard/234563)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 13\ **Last updated:** [April 3, 2015, 1:09am UTC](https://www.ruby-forum.com/t/gnu-radio-on-zedboard/234563 "2015-04-03T01:09:44Z")
Hello everyone, I’m going through the instructions from here: http://gnuradio.org/redmine/projects/gnuradio/wiki/Zynq to get a working image with gnu radio for my zedboard. Unfortunately I can’t get the board to boot… --- ## [Demodulating short bursts of BPSK](https://www.ruby-forum.com/t/demodulating-short-bursts-of-bpsk/241394)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 3, 2015, 12:56am UTC](https://www.ruby-forum.com/t/demodulating-short-bursts-of-bpsk/241394 "2015-04-03T00:56:34Z")
I have an application that needs to decode short bursts of DBPSK data (which I am not generating myself). The problem I am having is that the standard PSK Demod blocks don’t lock up in time to correctly decode the fir… --- ## [OOK modulation naming](https://www.ruby-forum.com/t/ook-modulation-naming/241392)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [April 2, 2015, 10:25pm UTC](https://www.ruby-forum.com/t/ook-modulation-naming/241392 "2015-04-02T22:25:37Z")
A friend recently showed me an OOK modulation that I had never seen before, and I’m wondering if anyone knows a name for this scheme. It is PWM where both the on periods and off periods carry data in their durations. … --- ## ["Run to completion" not working with message passing blocks](https://www.ruby-forum.com/t/run-to-completion-not-working-with-message-passing-blocks/240759)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 11\ **Last updated:** [April 2, 2015, 3:32pm UTC](https://www.ruby-forum.com/t/run-to-completion-not-working-with-message-passing-blocks/240759 "2015-04-02T15:32:44Z")
Hi all, I want to use message passing blocks for operations where strict synchronization is not necessary. However in flowgraphs using message passing with “Run to completion” option turned on the program doesn’t exi… --- ## [Failed to install gnuradio with PyBOMBS](https://www.ruby-forum.com/t/failed-to-install-gnuradio-with-pybombs/241382)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 9\ **Last updated:** [April 2, 2015, 2:06pm UTC](https://www.ruby-forum.com/t/failed-to-install-gnuradio-with-pybombs/241382 "2015-04-02T14:06:09Z")
Dear Sir, Recently I failed to install GNU Radio using PyBOMBS. Error message: /home/sgku/download/gnuradio/pybombs/src/gnuradio/gr-dtv/lib/dvbt2/dvbt2\_paprtr\_cc\_impl.cc:750:95: error: ‘volk\_32fc\_s32fc\_multiply\_32fc’… --- ## [Error in creating block](https://www.ruby-forum.com/t/error-in-creating-block/241391)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 2, 2015, 12:22pm UTC](https://www.ruby-forum.com/t/error-in-creating-block/241391 "2015-04-02T12:22:52Z")
Hi… I crated a block named ‘costas\_loop\_cc’. but when I connect to test this block with NULL sink and NULL Source, shows the error like this: Error 1: Generating: “/home/lekha/top\_block.py” Executing: “/home/lekha/… --- ## [Audio\_alsa\_sink problem on RPi2](https://www.ruby-forum.com/t/audio-alsa-sink-problem-on-rpi2/241386)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 2, 2015, 9:30am UTC](https://www.ruby-forum.com/t/audio-alsa-sink-problem-on-rpi2/241386 "2015-04-02T09:30:21Z")
Hello, When trying to use audio sink in GRC I get following error: audio: using audio\_alsa audio\_alsa\_sink\[hw:0,0\]: set\_channels failed: Invalid argument It’s the same with device “plughw:0,0”. No error with hw:0,1 … --- ## [Binary Output](https://www.ruby-forum.com/t/binary-output/241384)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 2, 2015, 5:27am UTC](https://www.ruby-forum.com/t/binary-output/241384 "2015-04-02T05:27:28Z")
Which block do I have to use to get a binary output on Gnuradio (output = 0 or output = 1)? Which are the apropriate settings of this block? I know that there are the “Binary Slicer” block, but I don’t know if it is t… --- ## [Weird build-gnuradio failures on Ubuntu](https://www.ruby-forum.com/t/weird-build-gnuradio-failures-on-ubuntu/241383)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 2, 2015, 4:38am UTC](https://www.ruby-forum.com/t/weird-build-gnuradio-failures-on-ubuntu/241383 "2015-04-02T04:38:51Z")
Got around to looking at build failures on Ubuntu today (on versions where it previously worked). It turns out that Ubuntu renamed the libzmq packages to libzmq1 and the --ignore-missing directive isn’t really what yo… --- ## [Gr-uhd: rx\_freq tag and lo\_locked](https://www.ruby-forum.com/t/gr-uhd-rx-freq-tag-and-lo-locked/241355)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 9\ **Last updated:** [April 1, 2015, 11:32pm UTC](https://www.ruby-forum.com/t/gr-uhd-rx-freq-tag-and-lo-locked/241355 "2015-04-01T23:32:49Z")
Hi all, I’ve been working on a flowgraph that controls sweeping a USRP by retuning and then dumping samples until catching the sample tagged with rx\_freq of the correct value. I was confused as to why I was still get… --- ## [Release Announcement: GNU Radio 4.1](https://www.ruby-forum.com/t/release-announcement-gnu-radio-4-1/241378)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 16\ **Last updated:** [April 1, 2015, 11:29pm UTC](https://www.ruby-forum.com/t/release-announcement-gnu-radio-4-1/241378 "2015-04-01T23:29:18Z")
Hey everyone, as you might have heard, a GNU Radio hackfest is going on in sunny California, and one thing we’ve gotten going is the 4.1 release for GNU Radio. As you can tell, this is a major version jump. Here’s a … --- ## [Build failing in gr-dtv due to VOLK issues](https://www.ruby-forum.com/t/build-failing-in-gr-dtv-due-to-volk-issues/241371)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 1, 2015, 10:40pm UTC](https://www.ruby-forum.com/t/build-failing-in-gr-dtv-due-to-volk-issues/241371 "2015-04-01T22:40:35Z")
I’ve attached the log from the make. This is on Fedora 18, on a x64 platform. The repo was cloned fresh just before the build, and I used the “maint” branch. --- ## [E310 Network Mode](https://www.ruby-forum.com/t/e310-network-mode/241376)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 1, 2015, 9:43pm UTC](https://www.ruby-forum.com/t/e310-network-mode/241376 "2015-04-01T21:43:28Z")
I am trying to enable the network emulation mode on my E310. It is my understanding that the UHD version must be 3.08 or higher to support this, but is that the UHD version on the laptop or E310? My Lubuntu 14.04 lapt… --- ## [How to increase the noutput\_items](https://www.ruby-forum.com/t/how-to-increase-the-noutput-items/241370)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [April 1, 2015, 8:37pm UTC](https://www.ruby-forum.com/t/how-to-increase-the-noutput-items/241370 "2015-04-01T20:37:53Z")
Dear all, I’m experiencing a problem with the noutput\_items. I have written a sync block which did “return” several times. I found the noutput\_items dropped exactly by the amount that I returned. For example, if I … --- ## [Simulating MIMO-OFDM systems](https://www.ruby-forum.com/t/simulating-mimo-ofdm-systems/241366)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [April 1, 2015, 7:26pm UTC](https://www.ruby-forum.com/t/simulating-mimo-ofdm-systems/241366 "2015-04-01T19:26:47Z")
Hi, I am interested in simulating various algorithms for signal processing in MIMO-OFDM based software-defined radios and cognitive radios. In this context, I am curious to know if such simulations are possible with … --- ## [Top-block does not find Probe Signal block](https://www.ruby-forum.com/t/top-block-does-not-find-probe-signal-block/241365)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 1, 2015, 3:02pm UTC](https://www.ruby-forum.com/t/top-block-does-not-find-probe-signal-block/241365 "2015-04-01T15:02:04Z")
Hello GNUR’s! I am currently working with a SDR dongle which I want to lock at four different frequencies to see four consecutive parts of the spectrum. I have to do so because the sampling rate is not enough (2.4 MHz… --- ## [Error in creating a block](https://www.ruby-forum.com/t/error-in-creating-a-block/241362)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [April 1, 2015, 1:53pm UTC](https://www.ruby-forum.com/t/error-in-creating-a-block/241362 "2015-04-01T13:53:36Z")
Hi… I created a block named ‘costas’. But it showing the error as in screenshot attached. what is the problem with this? thanks for your advice. --- ## [Costas loop for 16 PSK](https://www.ruby-forum.com/t/costas-loop-for-16-psk/241364)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 1, 2015, 10:28am UTC](https://www.ruby-forum.com/t/costas-loop-for-16-psk/241364 "2015-04-01T10:28:20Z")
Hi… Any one has the control loop code for 16 PSK. Where should I get the code? thanks --- ## ["make" error while making detector (howto\_detect\_ff) block](https://www.ruby-forum.com/t/make-error-while-making-detector-howto-detect-ff-block/241321)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [April 1, 2015, 10:15am UTC](https://www.ruby-forum.com/t/make-error-while-making-detector-howto-detect-ff-block/241321 "2015-04-01T10:15:55Z")
hey, I am working to make a detector block in gnuradio 3.7.1 using gr-how “out-of-tree module”. I am stuck with an error during make command abhishek@abhishek-Inspiron-N5110:~/gr-howto/build$ make Scanning dependenci… --- ## [Error in creating a block](https://www.ruby-forum.com/t/error-in-creating-a-block/241344)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 1, 2015, 8:04am UTC](https://www.ruby-forum.com/t/error-in-creating-a-block/241344 "2015-04-01T08:04:41Z")
Hi… I created a block named ‘cost’. But it showing the error as in screenshot attached what is the problem with this? thanks for your advice. --- ## [GRC with 2 USRP X310 motherboards and 4 channels](https://www.ruby-forum.com/t/grc-with-2-usrp-x310-motherboards-and-4-channels/241353)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 31, 2015, 9:33pm UTC](https://www.ruby-forum.com/t/grc-with-2-usrp-x310-motherboards-and-4-channels/241353 "2015-03-31T21:33:25Z")
I need to set up 2 X310 motherboards to do a 4 channel receive using Gnuradio-Companion under Ubuntu 14.04 LTS, Under GRC, it seems not straighforward to specify the four different carrier frequencies (all four channe… --- ## [Re: Copying OOT blocks to a different system](https://www.ruby-forum.com/t/re-copying-oot-blocks-to-a-different-system/241350)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 31, 2015, 9:17pm UTC](https://www.ruby-forum.com/t/re-copying-oot-blocks-to-a-different-system/241350 "2015-03-31T21:17:27Z")
Thanks Marcus, that worked. And it is much simpler. John From: Marcus Müller you shouldn’t use gr\_modtool to create a new module on your destination system – just take your OOT’s folder, and copy it over to the des… --- ## [Generating Custom Packet Header](https://www.ruby-forum.com/t/generating-custom-packet-header/241340)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [March 31, 2015, 8:47pm UTC](https://www.ruby-forum.com/t/generating-custom-packet-header/241340 "2015-03-31T20:47:21Z")
Hello everyone, I’ve made the default packet generator work for my radio. I now want to make a custom header. The difference is described below: GNU Radio Default Header: \[Payload Length (12 bits) | Packet Number (12 … --- ## [New Public Course Offerings for SDR and GNU Radio](https://www.ruby-forum.com/t/new-public-course-offerings-for-sdr-and-gnu-radio/241348)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [March 31, 2015, 6:30pm UTC](https://www.ruby-forum.com/t/new-public-course-offerings-for-sdr-and-gnu-radio/241348 "2015-03-31T18:30:37Z")
View this email in your browser http://us10.campaign-archive1.com/?u=ef1aa9b809823d269b24031b7&id=f45ea7f61e&e=\[UNIQID\]New Public Course Offerings for SDR and GNU Radio Earlier this year Corgan Labs introduced new pub… --- ## [GNU Radio on Raspberry Pi Model 2?](https://www.ruby-forum.com/t/gnu-radio-on-raspberry-pi-model-2/241347)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [March 31, 2015, 6:22pm UTC](https://www.ruby-forum.com/t/gnu-radio-on-raspberry-pi-model-2/241347 "2015-03-31T18:22:24Z")
What’s the best way to get GNU Radio working on the new Raspberry Pi 2? I have tried a straight from source compile and just installing the package. Both methods ended up not being able to see my FunCube Dongle Pro+ … --- ## [Swig and python import problem due to other out-of-tree modules used in my out-of-tree module](https://www.ruby-forum.com/t/swig-and-python-import-problem-due-to-other-out-of-tree-modules-used-in-my-out-of-tree-module/241326)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [March 31, 2015, 4:52pm UTC](https://www.ruby-forum.com/t/swig-and-python-import-problem-due-to-other-out-of-tree-modules-used-in-my-out-of-tree-module/241326 "2015-03-31T16:52:42Z")
I’ve asked this question before. But there are lots of ambiguity and uncertainty. Thus, this is the clarification. I am using Reed-Solomon En/decoder in my own OOT module sources. The Reed-Solomon en/decoder are imple… --- ## [Copying OOT blocks to a different system](https://www.ruby-forum.com/t/copying-oot-blocks-to-a-different-system/241349)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 31, 2015, 3:05pm UTC](https://www.ruby-forum.com/t/copying-oot-blocks-to-a-different-system/241349 "2015-03-31T15:05:37Z")
Hello again GNU Radio’ers, We are trying to copy an OOT module with custom C++ blocks from one system to another. We’ve done this successfully before where the systems were nearly exact copies, but now we are trying t… --- ## [Not able to open GNU Radio on OS X Yosemite](https://www.ruby-forum.com/t/not-able-to-open-gnu-radio-on-os-x-yosemite/241346)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [March 31, 2015, 2:44pm UTC](https://www.ruby-forum.com/t/not-able-to-open-gnu-radio-on-os-x-yosemite/241346 "2015-03-31T14:44:39Z")
Hi, I am using a MacBook Pro from 2011 and I am trying to work with GNU RADIO (nightmare). I installed all the software two weeks ago and have been working with it during last week. Nevertheless, today it seems not t… --- ## [Illegal CustomBuild for MSVC 18](https://www.ruby-forum.com/t/illegal-custombuild-for-msvc-18/241345)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [March 31, 2015, 12:39pm UTC](https://www.ruby-forum.com/t/illegal-custombuild-for-msvc-18/241345 "2015-03-31T12:39:00Z")
I have had some more success building Gr using MSVC v18 than MSVC v16 previously (nearly impossible). Besides the high noise-level (due to cmake/msvc/config.h), the C++ building seems fine. But the build stops in ‘bu… --- ## [Weird behavior of the correlate\_and\_sync block](https://www.ruby-forum.com/t/weird-behavior-of-the-correlate-and-sync-block/234771)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 31, 2015, 12:26am UTC](https://www.ruby-forum.com/t/weird-behavior-of-the-correlate-and-sync-block/234771 "2015-03-31T00:26:49Z")
I’m trying to use the correlate\_and\_sync block to get an initial timing estimate from a packet radio, but it doesn’t seem to work at all. I decided to dig a bit deeper and try to figure out what it was doing. As it tu… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=27) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=29)