# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=26 [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:** 27 --- ## [How to tune gnuradio-companion from an external application](https://www.ruby-forum.com/t/how-to-tune-gnuradio-companion-from-an-external-application/241598)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 18, 2015, 3:20am UTC](https://www.ruby-forum.com/t/how-to-tune-gnuradio-companion-from-an-external-application/241598 "2015-04-18T03:20:42Z")
Hello, I am new to GNU radio. I have an application first written for Windows and now successfully ported to Ubuntu Linux. Briefly, the program uses the Longley and Rice Irregular terrain method to determine the path … --- ## [N210 XCVR2450 Max Transmit Gain](https://www.ruby-forum.com/t/n210-xcvr2450-max-transmit-gain/241437)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 17, 2015, 9:34pm UTC](https://www.ruby-forum.com/t/n210-xcvr2450-max-transmit-gain/241437 "2015-04-17T21:34:03Z")
?Dear All, For some experiments I would like to transmit using N210s with XCVR2450 with maximum transmit gain. I can see Ettus website that the XCVR2450 board in the transmit path has a gain of: VGA: 0-30 dB range … --- ## [Problem installing Gnuradio](https://www.ruby-forum.com/t/problem-installing-gnuradio/241593)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 17, 2015, 8:01pm UTC](https://www.ruby-forum.com/t/problem-installing-gnuradio/241593 "2015-04-17T20:01:34Z")
Hello, everybody. I’m having some troubles installing the Gnuradio. Everything seems all right, but when I try to run it using the terminal, this error appears: Traceback (most recent call last): File “/usr/local/bin… --- ## [Changing Existing Custom Blocks Argument List](https://www.ruby-forum.com/t/changing-existing-custom-blocks-argument-list/241585)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 17, 2015, 12:51am UTC](https://www.ruby-forum.com/t/changing-existing-custom-blocks-argument-list/241585 "2015-04-17T00:51:09Z")
Hello all, I created a C++ block using gr\_modtool in which I declared one variable in the argument list initially. I now want to update this block to take more arguments. What is the recommended way of going about t… --- ## [Code::blocks gnuradio project examples](https://www.ruby-forum.com/t/code-blocks-gnuradio-project-examples/241561)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [April 16, 2015, 8:28pm UTC](https://www.ruby-forum.com/t/code-blocks-gnuradio-project-examples/241561 "2015-04-16T20:28:28Z")
Hi, I am new to Gnuradio, just created a code::blocks project for the GNURadio, is there an example sub-project in the code::blocks source tree I could start play with? thanks, --- ## [Costum FPGA in E310](https://www.ruby-forum.com/t/costum-fpga-in-e310/241521)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 16, 2015, 10:43am UTC](https://www.ruby-forum.com/t/costum-fpga-in-e310/241521 "2015-04-16T10:43:19Z")
Hi all, I am actually working on a project needs migrate an old FPGA program to E310. First, I want to custom the official FPGA program of E310. But I found some configurations of PS are not the same on the schematics … --- ## [UHD Warning: Unable to set the thread priority](https://www.ruby-forum.com/t/uhd-warning-unable-to-set-the-thread-priority/241575)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 16, 2015, 5:17am UTC](https://www.ruby-forum.com/t/uhd-warning-unable-to-set-the-thread-priority/241575 "2015-04-16T05:17:58Z")
Hi: I had some trouble when running my C++ program. The console message is: UHD Warning: Unable to set the thread priority. Performance may be negatively affected.Please see the general application notes in the manu… --- ## [Why can't I easily find how to specify my usrp IP](https://www.ruby-forum.com/t/why-cant-i-easily-find-how-to-specify-my-usrp-ip/241570)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 15, 2015, 8:29pm UTC](https://www.ruby-forum.com/t/why-cant-i-easily-find-how-to-specify-my-usrp-ip/241570 "2015-04-15T20:29:35Z")
Seriously, that should be a single google search, I can’t find it. It’s not in the documentation. What the hell. This is the trouble I’ve had with quite a few things on GNU radio, no startup info is available. --- ## [Gr-ais fails?](https://www.ruby-forum.com/t/gr-ais-fails/241323)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [April 15, 2015, 11:33am UTC](https://www.ruby-forum.com/t/gr-ais-fails/241323 "2015-04-15T11:33:21Z")
Hi, with latest UHD and Gnuradio built from sources, gr-ais throws this error when callin ais\_rx: ras@ubuntu:~$ ais\_rx linux; GNU C++ version 4.8.2; Boost\_105400; UHD\_003.008.002-143-g8c20712d – Operating over USB… --- ## [GRCWG Dev Call](https://www.ruby-forum.com/t/grcwg-dev-call/241545)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 14, 2015, 8:03pm UTC](https://www.ruby-forum.com/t/grcwg-dev-call/241545 "2015-04-14T20:03:02Z")
Hey, tomorrow is a GRCWG Dev Call (short notice, I know…). We will discuss future block wrapper file formats. http://gnuradio.org/redmine/projects/gnuradio/wiki/Call20150414 https://plus.google.com/u/0/events/ckkqlrl… --- ## [The FPGA build is not compatible with the host code build](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 14, 2015, 6:05pm UTC](https://www.ruby-forum.com/t/the-fpga-build-is-not-compatible-with-the-host-code-build/241553 "2015-04-14T18:05:07Z")
Hi all, I’m a new user of GNURadio and USRP. I used the script “build-gnuradio” to download the source and have installed them all.But when I tried the “uhd\_fft”, the terminal showed as belows: Linux; GNU C++ versio… --- ## [About IQ dc offset calibration](https://www.ruby-forum.com/t/about-iq-dc-offset-calibration/241554)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 14, 2015, 4:37pm UTC](https://www.ruby-forum.com/t/about-iq-dc-offset-calibration/241554 "2015-04-14T16:37:57Z")
hello! everyone! what’s the algorithm of the IQ dc offset ,IQ phase and amplitude calibration?I find the part in usrp fpga code,but I don’t understand how it works?Is there any documentions ? --- ## [RMS value of a signal changes with PAPR](https://www.ruby-forum.com/t/rms-value-of-a-signal-changes-with-papr/241542)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [April 14, 2015, 1:01pm UTC](https://www.ruby-forum.com/t/rms-value-of-a-signal-changes-with-papr/241542 "2015-04-14T13:01:22Z")
Dear all, I’m calculating the RMS value of a signal with the following setup RF vector signal generator → USRP/rtl-sdr/… → “RMS” block in GRC. Please bear with me - I’m not interested in the exact (absolute) voltage … --- ## [Some misconceptions about the "peak\_detector2" block](https://www.ruby-forum.com/t/some-misconceptions-about-the-peak-detector2-block/241516)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 13, 2015, 10:57pm UTC](https://www.ruby-forum.com/t/some-misconceptions-about-the-peak-detector2-block/241516 "2015-04-13T22:57:10Z")
Hi all, recently there has been some discussion regarding the peak\_detector2 block, both in the github/gnuradio (pull request 404) as well as in the issue tracker (issue 783). It is now well accepted that this bloc… --- ## [Announcing NEWSDR at WPI on Thr/Fri May 21/22](https://www.ruby-forum.com/t/announcing-newsdr-at-wpi-on-thr-fri-may-21-22/241543)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 13, 2015, 5:15pm UTC](https://www.ruby-forum.com/t/announcing-newsdr-at-wpi-on-thr-fri-may-21-22/241543 "2015-04-13T17:15:52Z")
NEWSDR 2015 \* \* New England Workshop on Software-Defined Radio \* … --- ## [Insert messages in queues?](https://www.ruby-forum.com/t/insert-messages-in-queues/241530)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [April 13, 2015, 8:34am UTC](https://www.ruby-forum.com/t/insert-messages-in-queues/241530 "2015-04-13T08:34:43Z")
If I’m using a block that has a message port output, is there a way to put those messages into a message queue? For instance: self.message\_queue = gr.msg\_queue() self.msg\_connect((self.gsm\_control\_channels\_decoder, … --- ## [Report on progress with Raspberry Pi 2](https://www.ruby-forum.com/t/report-on-progress-with-raspberry-pi-2/241529)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 12, 2015, 11:35am UTC](https://www.ruby-forum.com/t/report-on-progress-with-raspberry-pi-2/241529 "2015-04-12T11:35:00Z")
BLUF: I can get gqrx to run but not very well. It will run for a few seconds then hang badly. Sometimes the board needs to be rebooted. After much goofing around getting it all setup again I ended up at the same plac… --- ## [Re: pccc encoder](https://www.ruby-forum.com/t/re-pccc-encoder/241525)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 12, 2015, 4:34am UTC](https://www.ruby-forum.com/t/re-pccc-encoder/241525 "2015-04-12T04:34:00Z")
You are using the pccc decoder in an incorrect way. Please see attached corrected grc file: there are two ways to use the pccc decoder (i) either as a combo or (ii) in conjuction with trellis metrics. I have provided… --- ## [Zedboard and Pybombs](https://www.ruby-forum.com/t/zedboard-and-pybombs/241526)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 12, 2015, 2:48am UTC](https://www.ruby-forum.com/t/zedboard-and-pybombs/241526 "2015-04-12T02:48:03Z")
Hello, I’m trying to get GNU Radio installed on a Zedboard and decided to give pybombs a shot. It’s a take on Ubuntu 12.04 called Xillinux (so that my group is able to interact with the FPGA). After running these few… --- ## [VOLK 1.0 release](https://www.ruby-forum.com/t/volk-1-0-release/241524)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 11, 2015, 9:38pm UTC](https://www.ruby-forum.com/t/volk-1-0-release/241524 "2015-04-11T21:38:58Z")
VOLK release 1.0 is now available for download: http://libvolk.org/releases/volk-1.0.tar.gz MD5 sum: a17129f171747a0ac74fe44686227b69 For those that have not been following GNU Radio development, this is the first r… --- ## [Re: pccc encoder](https://www.ruby-forum.com/t/re-pccc-encoder/241471)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 11, 2015, 8:53pm UTC](https://www.ruby-forum.com/t/re-pccc-encoder/241471 "2015-04-11T20:53:05Z")
Since your constellation is complex, then its dimensionality (in the chunks\_to\_symbos block, as well as in the PCCC decoder block) should be set to 1 (you are now have it at 2). The convention is that the chunks\_to\_sy… --- ## [Re: python - double free or corruption error](https://www.ruby-forum.com/t/re-python-double-free-or-corruption-error/241519)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 11, 2015, 3:16pm UTC](https://www.ruby-forum.com/t/re-python-double-free-or-corruption-error/241519 "2015-04-11T15:16:20Z")
On Sat, 11 Apr 2015, Marcus M. wrote: to get a backtrace. For a bit more of background \[1\]. \[1\] http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsGDB Hi Marcus This writeup on using gdb is great! I notic… --- ## [Python - double free or corruption error](https://www.ruby-forum.com/t/python-double-free-or-corruption-error/241503)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 11, 2015, 12:17pm UTC](https://www.ruby-forum.com/t/python-double-free-or-corruption-error/241503 "2015-04-11T12:17:53Z")
Hi, when running a gnuradio application.py from the cmd line after some seconds the application crashs and i get the message: \*\*\* Error in \`python’: double free or corruption (fasttop): 0xaf9031c0 Iam using python 2… --- ## [Re: video transmission](https://www.ruby-forum.com/t/re-video-transmission/241493)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 10, 2015, 5:02pm UTC](https://www.ruby-forum.com/t/re-video-transmission/241493 "2015-04-10T17:02:48Z")
Ron E. (drmpeg) is the author of some terrific DVB modules that you might find helpful as a reference for your project: You should also check CGRAN: http://cgran.org/ On 9 April 2015 at 05:48, Vishwanatha H G r… --- ## [Error using Sample and Hold](https://www.ruby-forum.com/t/error-using-sample-and-hold/241510)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 10, 2015, 3:42pm UTC](https://www.ruby-forum.com/t/error-using-sample-and-hold/241510 "2015-04-10T15:42:58Z")
Hello, I’m having some troubles when I use the Sample and Hold block. I’ve searched and some people say it is a problem in the python code. I am new in GNU radio. Please, can ayone help me to solve it? I uploaded a p… --- ## [Install non-pybombs app into pybombs system](https://www.ruby-forum.com/t/install-non-pybombs-app-into-pybombs-system/241498)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 10, 2015, 3:47am UTC](https://www.ruby-forum.com/t/install-non-pybombs-app-into-pybombs-system/241498 "2015-04-10T03:47:31Z")
Hi – I’ve used pybombs to install gnuradio et al using the default ~/pybombs and ~/targets directory structure. Now I need to add an OOT that is not available through pybombs. I’ve tried guessing where to put the di… --- ## [X Window System error](https://www.ruby-forum.com/t/x-window-system-error/241469)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 10, 2015, 1:23am UTC](https://www.ruby-forum.com/t/x-window-system-error/241469 "2015-04-10T01:23:21Z")
Dear Sir, I’ve just install gnuradio using pybombs, and manually install the missing python-opengl using apt-get. Unfortunately below error occurs when I execute a flowgraph. Executing: “/home/sgku/Dropbox/gnuradio… --- ## [Moving from an apt-get (Ubunto) install to Pybombs](https://www.ruby-forum.com/t/moving-from-an-apt-get-ubunto-install-to-pybombs/241492)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 9, 2015, 9:43pm UTC](https://www.ruby-forum.com/t/moving-from-an-apt-get-ubunto-install-to-pybombs/241492 "2015-04-09T21:43:58Z")
Greetings, Long time lurker–daily user, but now faced with a decision. I have noticed the fine work with Pybombs and picked up a more hardware and thought to myself:“Hey, now is time to bite the bullet is start using … --- ## [Video transmission](https://www.ruby-forum.com/t/video-transmission/241481)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 9, 2015, 8:07pm UTC](https://www.ruby-forum.com/t/video-transmission/241481 "2015-04-09T20:07:09Z")
Hi… I want to transmit video by using 16qam/4qam using constellation receiver. Can you kindly send me the flowgraph to do that if it can be done? thank you in advance. with regards, vishwanath --- ## [Exit Flowgraph on error](https://www.ruby-forum.com/t/exit-flowgraph-on-error/241488)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 9, 2015, 7:58pm UTC](https://www.ruby-forum.com/t/exit-flowgraph-on-error/241488 "2015-04-09T19:58:21Z")
Hello, I am using GNURadio with an DVB-T Stick. Is there a way to tell GNURadio to exit the flowgraph when an error occurs. For example if there occurs an error with the RTL, currently GNURadio outputs the error, but… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=25) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=27)