# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=15 [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:** 16 --- ## [Correlation Estimator Bugs](https://www.ruby-forum.com/t/correlation-estimator-bugs/242538)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [July 1, 2015, 4:03pm UTC](https://www.ruby-forum.com/t/correlation-estimator-bugs/242538 "2015-07-01T16:03:30Z")
Hi all, I was just looking through the code in corr\_est\_cc\_impl.cc because it is behaving unexpectedly and I think I have spotted a few bugs. If you look at line 203 inside \_set\_threshold and line 240 inside work, … --- ## [Is there a project which implements half-duplex communications?](https://www.ruby-forum.com/t/is-there-a-project-which-implements-half-duplex-communications/242527)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [July 1, 2015, 6:10am UTC](https://www.ruby-forum.com/t/is-there-a-project-which-implements-half-duplex-communications/242527 "2015-07-01T06:10:22Z")
Hello, GNU Radio users, Very long time ago, USRP 1 was not suitable for half-duplex communications because USB 2.0 interface is too slow to achieve it. But now, there are USRP embedded and gigabit ethernet supporting… --- ## [HRPT receiver](https://www.ruby-forum.com/t/hrpt-receiver/242536)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [June 30, 2015, 11:03pm UTC](https://www.ruby-forum.com/t/hrpt-receiver/242536 "2015-06-30T23:03:21Z")
Hello, In the gnuradio/gr-noaa/README file under usrp\_rx\_hrpt.py, there is a comment that reads as follows: “The present HRPT demodulator is only tested at decimation 16. The only other valid decimation rates ar… --- ## [OFDM example from gr-digital with UHD](https://www.ruby-forum.com/t/ofdm-example-from-gr-digital-with-uhd/242464)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 13\ **Last updated:** [June 30, 2015, 10:51pm UTC](https://www.ruby-forum.com/t/ofdm-example-from-gr-digital-with-uhd/242464 "2015-06-30T22:51:05Z")
Hello, I was interested to test tx\_ofdm.grc and rx\_ofdm.grc from gr-digital, at the same time using USRP N200 devices. TX OFDM: The changes that I did were, removing throttle block and adding an UHD Sink instead, wit… --- ## [Hierarchical polyphase channelizer vs polyphase channelizer blocks in GRC](https://www.ruby-forum.com/t/hierarchical-polyphase-channelizer-vs-polyphase-channelizer-blocks-in-grc/242529)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 30, 2015, 7:48pm UTC](https://www.ruby-forum.com/t/hierarchical-polyphase-channelizer-vs-polyphase-channelizer-blocks-in-grc/242529 "2015-06-30T19:48:47Z")
Does anyone have any knowledge of how the parameters need to be set in the hierarchical pfb channelizer? There’s no documentation that I can find. I HAVE gotten the regular channelizer to work and it’s awesome (scree… --- ## [QT scope block?](https://www.ruby-forum.com/t/qt-scope-block/242499)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [June 30, 2015, 5:30pm UTC](https://www.ruby-forum.com/t/qt-scope-block/242499 "2015-06-30T17:30:55Z")
Hi, I am looking for a QT scope block for gnuradio companion. Ideally, I a complex input for the Y axis and a float input for the X axis would solve the problem. A QT time sink works for the Y axis, but does not sol… --- ## [Problems installing gr-foo and gr-ieee802-11](https://www.ruby-forum.com/t/problems-installing-gr-foo-and-gr-ieee802-11/242400)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [June 30, 2015, 3:27pm UTC](https://www.ruby-forum.com/t/problems-installing-gr-foo-and-gr-ieee802-11/242400 "2015-06-30T15:27:02Z")
Hello, I was trying to run some flow graphs from gr-ieee802-11 examples. When I opened them at the first time , there were some missing blocks like WIFI Phy Hier and foo\_packet\_pad. I got the first one fixed. For the … --- ## [Re: FEC in gnruadio](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [June 30, 2015, 11:01am UTC](https://www.ruby-forum.com/t/re-fec-in-gnruadio/242339 "2015-06-30T11:01:49Z")
implementation of the gr-fec so that I can go through the c++ We’re also about to merge in another approach to LDPC encoding and decoding What’s your particular interest in FEC? Are you looking to use it or impleme… --- ## [Decimation rate of log power fft block question](https://www.ruby-forum.com/t/decimation-rate-of-log-power-fft-block-question/242522)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 30, 2015, 8:31am UTC](https://www.ruby-forum.com/t/decimation-rate-of-log-power-fft-block-question/242522 "2015-06-30T08:31:05Z")
Hello everyone I am trying to integrate the output of a spectrum analyzer in real time. I sent the output of the osmocom source to a log power fft block, which is then sent to a meta file sink. In order for the progra… --- ## [Gentoo compile errors](https://www.ruby-forum.com/t/gentoo-compile-errors/242515)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 30, 2015, 12:33am UTC](https://www.ruby-forum.com/t/gentoo-compile-errors/242515 "2015-06-30T00:33:49Z")
I’ve been getting these errors when trying to update gnuradio for a week or so now. (I admit to not having tried to tackle them yet, hoping it would cure itself!) Have any other gentoo’ers? Thanks, Mike emerge gnu… --- ## [Gr-lte vs gr::digital::ofdm\*](https://www.ruby-forum.com/t/gr-lte-vs-gr-ofdm/242449)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [June 29, 2015, 11:20pm UTC](https://www.ruby-forum.com/t/gr-lte-vs-gr-ofdm/242449 "2015-06-29T23:20:46Z")
Hi all, Lately I’ve been working with gr-lte and trying to use some of those blocks in my own application (not grc). I’m still in the learning phase about ofdm/lte, and I’m struggling with the lack of documentation o… --- ## [Using GNU Radio Framework in my application](https://www.ruby-forum.com/t/using-gnu-radio-framework-in-my-application/242495)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [June 29, 2015, 4:33pm UTC](https://www.ruby-forum.com/t/using-gnu-radio-framework-in-my-application/242495 "2015-06-29T16:33:35Z")
Dear All: I need to have a RF link between two E310. My application is written is C++/ using Qt framework. I already made the GRC diagram, but grc generates python codes. Is there any source to help me integrate that… --- ## [Segmentation fault executing gnuradio-companion](https://www.ruby-forum.com/t/segmentation-fault-executing-gnuradio-companion/242509)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 29, 2015, 1:07pm UTC](https://www.ruby-forum.com/t/segmentation-fault-executing-gnuradio-companion/242509 "2015-06-29T13:07:57Z")
Greetings GnuRadio community For a week now i am trying to install gnuradio on Ubuntu 14.04. I use the command to fetch the script wget http://www.sbrac.org/files/build-gnuradio && chmod a+x ./build-gnuradio & ./buil… --- ## [Trouble getting GNUradio/UHD working (with PyBombs)](https://www.ruby-forum.com/t/trouble-getting-gnuradio-uhd-working-with-pybombs/242490)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [June 29, 2015, 10:16am UTC](https://www.ruby-forum.com/t/trouble-getting-gnuradio-uhd-working-with-pybombs/242490 "2015-06-29T10:16:12Z")
Hi all, I picekd up GNU Radio again and tried to get a simple plain C++ project working, but no success… Details below, hopefully somebody can set my nose in the right direction. What I want to do I want to do some C… --- ## [Wrong ELF Class: ELFCLASS32 (Ubuntu 14.04 64-bit)](https://www.ruby-forum.com/t/wrong-elf-class-elfclass32-ubuntu-14-04-64-bit/242501)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 28, 2015, 6:44pm UTC](https://www.ruby-forum.com/t/wrong-elf-class-elfclass32-ubuntu-14-04-64-bit/242501 "2015-06-28T18:44:28Z")
Hello, I am having trouble installing GNURadio on Ubuntu 14.04, 64-bit edition. I have used the information from the gnuradio install wiki to install using apt-get: sudo apt-get -y install git-core cmake g++ python-d… --- ## [Dx Patrol Setup](https://www.ruby-forum.com/t/dx-patrol-setup/242496)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [June 28, 2015, 5:22pm UTC](https://www.ruby-forum.com/t/dx-patrol-setup/242496 "2015-06-28T17:22:41Z")
Hello. I have been buying today a DX Patrol SDR board. Works on Android, however I’m getting some troubles with GRC. #rtl\_eeprom Found 1 device(s): 0: Generic RTL2832U OEM Using device 0: Generic RTL2832U OEM Fou… --- ## [Problem with send() function making OOT](https://www.ruby-forum.com/t/problem-with-send-function-making-oot/242454)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 9\ **Last updated:** [June 28, 2015, 5:16pm UTC](https://www.ruby-forum.com/t/problem-with-send-function-making-oot/242454 "2015-06-28T17:16:33Z")
Hi all, I am trying to make 2 TX 1Rx tagged stream block(OOT). For 1Tx 1Rx, it was working fine. I am trying to extend it. Now the problem is, I am not being able to configure the send() function. If I try make tes… --- ## [GNUradio companion HackRF GPS Receiver](https://www.ruby-forum.com/t/gnuradio-companion-hackrf-gps-receiver/242500)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 28, 2015, 4:21pm UTC](https://www.ruby-forum.com/t/gnuradio-companion-hackrf-gps-receiver/242500 "2015-06-28T16:21:07Z")
Hi everyone, i’m now using hackrf one,and want to know wich blocks or how can i use gnuradio companion to decode PRN code from sattellite, need your help please. --- ## [File Sink and File Source](https://www.ruby-forum.com/t/file-sink-and-file-source/242498)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 28, 2015, 1:15pm UTC](https://www.ruby-forum.com/t/file-sink-and-file-source/242498 "2015-06-28T13:15:00Z")
Hi guys! I’ve been doing experiments on GRC. I was trying to connect the Complex Max^2 block and Probe Signal block, but I get an error message. I’m guessing maybe because the output of the Complex Mag^2 is 64-bit whi… --- ## [Include an OOT module in another OOT module?](https://www.ruby-forum.com/t/include-an-oot-module-in-another-oot-module/242494)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 28, 2015, 12:54am UTC](https://www.ruby-forum.com/t/include-an-oot-module-in-another-oot-module/242494 "2015-06-28T00:54:15Z")
Let’s say I’ve made two OOT projects called gr-first and gr-second. I want to link gr-second against gr-first, but CMake isn’t finding it. gr-first/CMakeLists.txt seems to install a helper file: $PREFIX/lib/cmake/firs… --- ## [SOCIS project update 4](https://www.ruby-forum.com/t/socis-project-update-4/242487)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 27, 2015, 2:49pm UTC](https://www.ruby-forum.com/t/socis-project-update-4/242487 "2015-06-27T14:49:39Z")
Hey GNU Radio’ers, and here we go again. Another week has passed and thus it’s time for my weekly report. Just like last week, this week has been about implementing an encoder decoder chain in C++ for FECAPI. After I… --- ## [Transmit stream tags via socket](https://www.ruby-forum.com/t/transmit-stream-tags-via-socket/242475)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 26, 2015, 1:48pm UTC](https://www.ruby-forum.com/t/transmit-stream-tags-via-socket/242475 "2015-06-26T13:48:54Z")
Hello list, I kindly ask for an idea how to transmit a pmt::cons via a tcp (or udp) connection? Alternatively I want to transmit tagged streams including the tags. In my special case, the tag in question is an integer… --- ## [GRC Block with Selectable Item Type](https://www.ruby-forum.com/t/grc-block-with-selectable-item-type/242471)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 26, 2015, 2:17am UTC](https://www.ruby-forum.com/t/grc-block-with-selectable-item-type/242471 "2015-06-26T02:17:49Z")
Hi all, I made a custom block that I’d like to allow the user to select item type of. I started following in the footsteps of the copy block, but instead of having the drop down menu update the blocks ports to refle… --- ## [Order of tags returned by gr::block::get\_tags\_in\_range()/window()](https://www.ruby-forum.com/t/order-of-tags-returned-by-gr-get-tags-in-range-window/242450)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [June 25, 2015, 7:13pm UTC](https://www.ruby-forum.com/t/order-of-tags-returned-by-gr-get-tags-in-range-window/242450 "2015-06-25T19:13:43Z")
Hi all, When calling gr::block::get\_tags\_in\_range() or gr::block::get\_tags\_in\_window(), does the GNU Radio API guarantee that the returned vector will be sorted based upon the tag offsets (from “earliest” to “lates… --- ## [USRP RF output frequency is much faster than intended](https://www.ruby-forum.com/t/usrp-rf-output-frequency-is-much-faster-than-intended/242468)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 25, 2015, 5:02pm UTC](https://www.ruby-forum.com/t/usrp-rf-output-frequency-is-much-faster-than-intended/242468 "2015-06-25T17:02:51Z")
I build a flow graph like an image in the following link: http://i.imgur.com/PpXck09.jpg After then, I connect the USRP and an oscilloscope and see output, which yields: http://i.imgur.com/JEKhnfx.jpg As you see, bot… --- ## [Ofdm frequency offset](https://www.ruby-forum.com/t/ofdm-frequency-offset/242438)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 25, 2015, 4:34am UTC](https://www.ruby-forum.com/t/ofdm-frequency-offset/242438 "2015-06-25T04:34:30Z")
Dear all: Thank you in advance. 1. I want to ask a question about the new ofdm example.And I know the receiver have used the SCA(schmidl and cox algorithm) algorithm.Now in my application,maybe this algorithm isn’t … --- ## [Filter bank and massive “DDD” messages](https://www.ruby-forum.com/t/filter-bank-and-massive-ddd-messages/242429)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [June 25, 2015, 12:36am UTC](https://www.ruby-forum.com/t/filter-bank-and-massive-ddd-messages/242429 "2015-06-25T00:36:43Z")
Hi, I’m trying to filter 14 frequency bands (channels), which are dispersing within spectrum of 25 MHz (from 2 MHz - 27 MHz to be more specific) and each band has a different bandwidth. For example: 1th channel with … --- ## [Assign to 'out' but don't 'produce' anything](https://www.ruby-forum.com/t/assign-to-out-but-dont-produce-anything/242455)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 24, 2015, 11:00pm UTC](https://www.ruby-forum.com/t/assign-to-out-but-dont-produce-anything/242455 "2015-06-24T23:00:55Z")
What happens when you assign input to output in a general\_work call, out\[ii\]=in\[ii\], but don’t call produce? Is the stuff you dumped into ‘out’ lost when general\_work returns WORK\_CALLED\_PRODUCE? My minds eye sees th… --- ## [GR-UHD features incoming](https://www.ruby-forum.com/t/gr-uhd-features-incoming/241862)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [June 24, 2015, 10:22pm UTC](https://www.ruby-forum.com/t/gr-uhd-features-incoming/241862 "2015-06-24T22:22:56Z")
Hi, you might have noticed some movement on the gr-uhd component recently. Here’s a quick update what’s happening: Least importantly, there was some refactoring to reduce the amount of duplicated code between usrp\_si… --- ## [Can someone tell me if it is possible to run a python code directly in GNUradio?](https://www.ruby-forum.com/t/can-someone-tell-me-if-it-is-possible-to-run-a-python-code-directly-in-gnuradio/242452)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 24, 2015, 9:25pm UTC](https://www.ruby-forum.com/t/can-someone-tell-me-if-it-is-possible-to-run-a-python-code-directly-in-gnuradio/242452 "2015-06-24T21:25:06Z")
Can someone tell me if it is possible to run a python code directly in GNUradio? [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=14) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=16)