# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=71 [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:** 72 --- ## [Installation issues with gnuradio on Ubuntu 12.04 64-bit](https://www.ruby-forum.com/t/installation-issues-with-gnuradio-on-ubuntu-12-04-64-bit/241283)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 21, 2014, 11:47pm UTC](https://www.ruby-forum.com/t/installation-issues-with-gnuradio-on-ubuntu-12-04-64-bit/241283 "2014-05-21T23:47:18Z")
Hello, I’m having some issues when I attempt to install gnuradio on a computer running Ubuntu 12.04 64-bit. I followed the installation guide on the Ettus wiki (using the “Releases/Bugfixes” path) (http://code.ettus… --- ## [Hierarchical Block Installation Source](https://www.ruby-forum.com/t/hierarchical-block-installation-source/241256)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 21, 2014, 5:45pm UTC](https://www.ruby-forum.com/t/hierarchical-block-installation-source/241256 "2014-05-21T17:45:00Z")
This may be a dumb question but where do the custom hierarchical blocks generated in GRC get installed too? --- ## [Multiple subscription to a single output message output port](https://www.ruby-forum.com/t/multiple-subscription-to-a-single-output-message-output-port/241279)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 21, 2014, 4:09pm UTC](https://www.ruby-forum.com/t/multiple-subscription-to-a-single-output-message-output-port/241279 "2014-05-21T16:09:40Z")
Hi all guys, I currently have a hier block, and a several sub blocks are sending messages to a block outside of hier block. Is it possible that all subblocks subscribe to a unique output message port? At the moment I … --- ## [Put a block to sleep](https://www.ruby-forum.com/t/put-a-block-to-sleep/241268)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 21, 2014, 3:49pm UTC](https://www.ruby-forum.com/t/put-a-block-to-sleep/241268 "2014-05-21T15:49:58Z")
Hello everybody, I want to connect a source to a sink block but there must be a sort of synchronization between them. The sink block should ask the source to generate data stream on some specific instances. Between th… --- ## [Building error of GNURadio 3.7.2](https://www.ruby-forum.com/t/building-error-of-gnuradio-3-7-2/241249)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 21, 2014, 3:37pm UTC](https://www.ruby-forum.com/t/building-error-of-gnuradio-3-7-2/241249 "2014-05-21T15:37:40Z")
Hi everyone, I’ve tried to build GNRadio 3.7.2.1 from source, when I came to make step I’ve received two strange error, you find hereafter what it looks like: \[ 13%\] Generating python docstrings for pmt\_swig\_doc Tr… --- ## [ETTUS UB210 - sampling rate queries](https://www.ruby-forum.com/t/ettus-ub210-sampling-rate-queries/241266)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 21, 2014, 10:52am UTC](https://www.ruby-forum.com/t/ettus-ub210-sampling-rate-queries/241266 "2014-05-21T10:52:40Z")
Hi all, We’ve been playing with UN210 in half-duplex mode so far but in the current project we’d like to use the latest UB210 due to its high bandwidth. I was wondering about 3 preliminary queries: ETTUS Data Shee… --- ## [Random number of output items](https://www.ruby-forum.com/t/random-number-of-output-items/241222)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [May 21, 2014, 7:54am UTC](https://www.ruby-forum.com/t/random-number-of-output-items/241222 "2014-05-21T07:54:13Z")
Hi, I’m making a block which takes bit from a bit slicer and output packets as input comes in. My block will output bytes so it can emulate a usb adapter that receives the RF signal and output a packet stream throug… --- ## [No Audio w/ Audio Sink](https://www.ruby-forum.com/t/no-audio-w-audio-sink/241257)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 21, 2014, 3:34am UTC](https://www.ruby-forum.com/t/no-audio-w-audio-sink/241257 "2014-05-21T03:34:24Z")
I am running Ubuntu 14.04 and just got GRC up and running. I have made the sketch seen in this youtube video GNU Radio Tutorials: Part 1 - GRC, Sources, Sinks, Audio & GUI Blocks - YouTube but I cannot for the life of… --- ## [OutOfTree Module Tutorial](https://www.ruby-forum.com/t/outoftree-module-tutorial/238290)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 20, 2014, 11:18pm UTC](https://www.ruby-forum.com/t/outoftree-module-tutorial/238290 "2014-05-20T23:18:41Z")
Dear Helpers, I am using GNURadio 3.6.4.1. I am following the tutorial on OutOfTreeModules http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules. I am having trouble in running make test. It fails with … --- ## [For Sale: USRP N210 w/daughterboards](https://www.ruby-forum.com/t/for-sale-usrp-n210-w-daughterboards/241254)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 20, 2014, 9:37pm UTC](https://www.ruby-forum.com/t/for-sale-usrp-n210-w-daughterboards/241254 "2014-05-20T21:37:12Z")
Hi all, I’m selling my USRP N210 setup. Includes: Ettus USRP N210 BasicTX Daughterboard 1-250 MHz Tx. BasicRX Daughterboard 1-250 MHz Rx. LFRX Daughterboard 0-30 MHz Rx. WBX 50-2200 MHz Rx/Tx. XCVR2450 2.4-2.5 GH… --- ## [PN correlator and GLFSR source purpose and how to use it](https://www.ruby-forum.com/t/pn-correlator-and-glfsr-source-purpose-and-how-to-use-it/241253)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 20, 2014, 9:26pm UTC](https://www.ruby-forum.com/t/pn-correlator-and-glfsr-source-purpose-and-how-to-use-it/241253 "2014-05-20T21:26:43Z")
Hi all, I am using GLFSR source and PN correlaor blocks in my tranceiver for frame synchronization. My Question is that does PN correlator is used for frame synchronization? if yes then how to use these blocks. My … --- ## [Facebook](https://www.ruby-forum.com/t/facebook/241238)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [May 20, 2014, 7:49pm UTC](https://www.ruby-forum.com/t/facebook/241238 "2014-05-20T19:49:30Z")
Hi everybody, To be more communicative, we’v designed a page of “GNURadio” on facebook This page specially is for GNURadio developers who are following GNURadio ecosystem: :heavy\_check\_mark: new releases of GNURad… --- ## [Problem with qt constellation block](https://www.ruby-forum.com/t/problem-with-qt-constellation-block/241224)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 20, 2014, 5:59pm UTC](https://www.ruby-forum.com/t/problem-with-qt-constellation-block/241224 "2014-05-20T17:59:18Z")
Hi All, I’m trying to built a system with several digital modulations. First, I should be able to print constellations by using qt constellation block. I started by creating a simple flowgraph with two modulations. T… --- ## [\[Volk WG\] Meeting Tuesday June 3](https://www.ruby-forum.com/t/volk-wg-meeting-tuesday-june-3/241248)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 20, 2014, 4:01pm UTC](https://www.ruby-forum.com/t/volk-wg-meeting-tuesday-june-3/241248 "2014-05-20T16:01:47Z")
Hi all, Mark your calendars if you’re interested in joining a call to discuss VOLK-things. Agenda is in the works. Date: Tuesday June 3 @ 1PM EST; 5PM UTC. Nathan --- ## [Extra line in a module with python blocks](https://www.ruby-forum.com/t/extra-line-in-a-module-with-python-blocks/241246)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 20, 2014, 3:43pm UTC](https://www.ruby-forum.com/t/extra-line-in-a-module-with-python-blocks/241246 "2014-05-20T15:43:20Z")
Hi there, I’m writing an OOT module. For now, the only block I’ve made is written in Python. I follow the guide and everythins is ok until I run the top\_block and get this error: File “/usr/local/lib/python2.7/dis… --- ## [Frame delay synchronization issue](https://www.ruby-forum.com/t/frame-delay-synchronization-issue/241221)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 20, 2014, 3:16pm UTC](https://www.ruby-forum.com/t/frame-delay-synchronization-issue/241221 "2014-05-20T15:16:13Z")
Hi all, I am using QPSK Mod and demod I have issue of how to synchronize my frame means how to remove delays from my received data in using GRC block my flow graph is attached with this mail. I am trying to use pack… --- ## [Mimo](https://www.ruby-forum.com/t/mimo/241245)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 20, 2014, 12:50pm UTC](https://www.ruby-forum.com/t/mimo/241245 "2014-05-20T12:50:55Z")
Hello all: Recently the development of the MIMO has been the focus of intensive research.Any example codes about the MIMO(OFDM) to give someone like me a chance to get start? Thank you. Best regards --- ## [A question about function gr::block::set\_history()](https://www.ruby-forum.com/t/a-question-about-function-gr-set-history/241214)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 20, 2014, 11:14am UTC](https://www.ruby-forum.com/t/a-question-about-function-gr-set-history/241214 "2014-05-20T11:14:49Z")
Hi, I wrote a block using gnuradio history functionality. The block is inherited from gr::block (built by command “gr\_modtool add -t general my\_block”), with history set to a bit large number, 320. I then finished r… --- ## [Using uhd\_fft with USRP N210](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [May 20, 2014, 6:49am UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp-n210/241232 "2014-05-20T06:49:29Z")
Hi, I,m trying to run uhd\_fft with USRP N210, my machine run Ubuntu 12.04.4 LTS. I’ve already install UHD, gnuradio, & OpenBTS in my machine & works fine. But when i try to run uhd\_fft which is in /var/opt/gnuradio-… --- ## [Fw: Re: Questions about your lte receiver](https://www.ruby-forum.com/t/fw-re-questions-about-your-lte-receiver/241216)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 19, 2014, 6:05pm UTC](https://www.ruby-forum.com/t/fw-re-questions-about-your-lte-receiver/241216 "2014-05-19T18:05:48Z")
Hi,I’m forwarding the conversation I had a couple days ago with Johannes Demel so you can add it to the list.Cheers,Frederic Manteau--------- Original Message ---------From: removed\_email\_address@domain.invalid: “MANTE… --- ## [How to tune the agc2 parameters?](https://www.ruby-forum.com/t/how-to-tune-the-agc2-parameters/241206)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [May 19, 2014, 4:55pm UTC](https://www.ruby-forum.com/t/how-to-tune-the-agc2-parameters/241206 "2014-05-19T16:55:31Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Problem with the string of blocks: Packet Encoder - Packed to unpacked - Unpack k bits - Packet Deco](https://www.ruby-forum.com/t/problem-with-the-string-of-blocks-packet-encoder-packed-to-unpacked-unpack-k-bits-packet-deco/241235)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 19, 2014, 4:51pm UTC](https://www.ruby-forum.com/t/problem-with-the-string-of-blocks-packet-encoder-packed-to-unpacked-unpack-k-bits-packet-deco/241235 "2014-05-19T16:51:49Z")
Hi everybody, I’m currently working with some modulations (M-QAM, M-PSK) and my results are almost the same for all of them. I’m sending a wav file which is a 4-minute song and in reception I get just a few seconds o… --- ## [Socket PDU](https://www.ruby-forum.com/t/socket-pdu/241205)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 19, 2014, 4:07pm UTC](https://www.ruby-forum.com/t/socket-pdu/241205 "2014-05-19T16:07:56Z")
Hello , I have 2 questions, please: 1- If I put a vector source as input or file source & I choose " No repeat" for the input , I find that no output is written in file sink ! why ? 2- I want to receive real time vo… --- ## [Re: using uhd\_fft with USRP1](https://www.ruby-forum.com/t/re-using-uhd-fft-with-usrp1/241208)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [May 19, 2014, 3:48pm UTC](https://www.ruby-forum.com/t/re-using-uhd-fft-with-usrp1/241208 "2014-05-19T15:48:51Z")
On Wed, Apr 30, 2014 at 4:17 AM, Martin B. removed\_email\_address@domain.invalidwrote: Unfortunately it becomes incompatible after the uhd update: RuntimeError: GR-UHD detected ABI compatibility mismatch with UHD lib… --- ## [Costas loop in HRPT receiver](https://www.ruby-forum.com/t/costas-loop-in-hrpt-receiver/241189)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 19, 2014, 3:03pm UTC](https://www.ruby-forum.com/t/costas-loop-in-hrpt-receiver/241189 "2014-05-19T15:03:11Z")
Hello, Ive heard about costas loop to obtain the carrier of a PSK signal. But I dont know how it is implemented the carrier recovery in the hrpt example of gr-noaa in order to demodulate the BPSK signal. I would appr… --- ## [Build-gnuradio script and ubuntu 14.04](https://www.ruby-forum.com/t/build-gnuradio-script-and-ubuntu-14-04/241228)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 19, 2014, 12:43pm UTC](https://www.ruby-forum.com/t/build-gnuradio-script-and-ubuntu-14-04/241228 "2014-05-19T12:43:14Z")
Dear all, I tried to install gnuradio on ubuntu 14.04 with build-gnuradio script, but I got the message Your ubuntu release must be at least 9.04 to proceed. I’ve looked at the script build-gnuradio, the ubuntu 14.04… --- ## [Problem of Frame Synchronization](https://www.ruby-forum.com/t/problem-of-frame-synchronization/241213)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 19, 2014, 12:41pm UTC](https://www.ruby-forum.com/t/problem-of-frame-synchronization/241213 "2014-05-19T12:41:22Z")
Hi all, I am using QPSK mod and demod and I have problem with frame synchronization means there is always delays in the received data due to filters and channel etc. I am using Packet encoder and decoder for frame sy… --- ## [Receive sensitivity of B200](https://www.ruby-forum.com/t/receive-sensitivity-of-b200/241202)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 19, 2014, 12:10pm UTC](https://www.ruby-forum.com/t/receive-sensitivity-of-b200/241202 "2014-05-19T12:10:34Z")
Hi, I use B200 with OpenBTS at 900MHz. I get very low range (about 10m only) and I identified that this is due to receive channel in B200. Changing rxgain between 0 and 70dB makes vey little difference. Does anyone kn… --- ## [To send data from synthesizer of datas to an usrp e 110/to receive datas from usrp e110 to computer](https://www.ruby-forum.com/t/to-send-data-from-synthesizer-of-datas-to-an-usrp-e-110-to-receive-datas-from-usrp-e110-to-computer/241231)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 19, 2014, 10:32am UTC](https://www.ruby-forum.com/t/to-send-data-from-synthesizer-of-datas-to-an-usrp-e-110-to-receive-datas-from-usrp-e110-to-computer/241231 "2014-05-19T10:32:00Z")
Hi, First, I would like to send datas from a synthesizer of datas to an usrp e 110. Second, I would like to send these datas received by the usrp e 100 to my laptop. -To realize that, I 'm supposed to implement an… --- ## [Matplotlib runtime error](https://www.ruby-forum.com/t/matplotlib-runtime-error/240839)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [May 18, 2014, 3:01pm UTC](https://www.ruby-forum.com/t/matplotlib-runtime-error/240839 "2014-05-18T15:01:30Z")
Gurus, I try to transfer an image file via a pair of USRPs. At the receiver side, the data is fed into a custom block, where it plots the image in realtime using matplotlib’s pyplot.imshow(). Unfortunately, in the w… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=70) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=72)