# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=74 [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:** 75 --- ## [Hackfest EU](https://www.ruby-forum.com/t/hackfest-eu/241022)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 9, 2014, 2:52pm UTC](https://www.ruby-forum.com/t/hackfest-eu/241022 "2014-05-09T14:52:21Z")
Hi everyone, some of the European developers have been busy at the first EU hackfest the last couple of days, here in Karlsruhe, Germany. A lot of thanks go out to the powerline gang at KIT, who hosted the whole thin… --- ## [PAPR in OFDM with gnuradio?](https://www.ruby-forum.com/t/papr-in-ofdm-with-gnuradio/241015)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 9, 2014, 9:22am UTC](https://www.ruby-forum.com/t/papr-in-ofdm-with-gnuradio/241015 "2014-05-09T09:22:32Z")
hi how calculate PAPR in OFDM with flow graph? thanks BZS --- ## [I have a trouble with new types in python!](https://www.ruby-forum.com/t/i-have-a-trouble-with-new-types-in-python/240953)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 9\ **Last updated:** [May 9, 2014, 7:43am UTC](https://www.ruby-forum.com/t/i-have-a-trouble-with-new-types-in-python/240953 "2014-05-09T07:43:37Z")
Hello everybody, I have a new type in my gnuradio blocks which are defined in c++. However, the GRC don’t know them. \*The first question is how I could make GRC of such blocks? \* I think if I could be able to define… --- ## [D(overflow) when USRP2 as Rx and S(Packet drop?) as Tx](https://www.ruby-forum.com/t/d-overflow-when-usrp2-as-rx-and-s-packet-drop-as-tx/240987)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 8, 2014, 4:20pm UTC](https://www.ruby-forum.com/t/d-overflow-when-usrp2-as-rx-and-s-packet-drop-as-tx/240987 "2014-05-08T16:20:18Z")
hi, Im using a USRP2 as 2 Rx(Antenne J1 and J2).and using a USRPN210 as Tx. when I started flow graph, i saw ‘DDDDDDD’ keeping showing up.and when I changed USRP2 as 2 Tx and USRPN210 as Rx, i saw ‘SSSSSS’. I also tr… --- ## [Polyphase Clock Synchronization block add some noise to constellation](https://www.ruby-forum.com/t/polyphase-clock-synchronization-block-add-some-noise-to-constellation/240976)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 8, 2014, 3:54pm UTC](https://www.ruby-forum.com/t/polyphase-clock-synchronization-block-add-some-noise-to-constellation/240976 "2014-05-08T15:54:07Z")
Hi all, I am using Polyphase Clock Synchronization block of GRC for symbol timing synchronization.currently I am doing simulations of QPSK using channel modal block. Ployphase clock synchronizer block work properly m… --- ## [Pass new types to the "make" function](https://www.ruby-forum.com/t/pass-new-types-to-the-make-function/240967)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 8, 2014, 2:29pm UTC](https://www.ruby-forum.com/t/pass-new-types-to-the-make-function/240967 "2014-05-08T14:29:48Z")
hello every body, I really have a problem with data types when I want to use my out-of-tree module in GRC which is written in c++. I have a “make” like this: make(unsinged int x, usigned char y) how could I use thi… --- ## [Multiplication of complex signals in GRC](https://www.ruby-forum.com/t/multiplication-of-complex-signals-in-grc/240964)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 8, 2014, 10:54am UTC](https://www.ruby-forum.com/t/multiplication-of-complex-signals-in-grc/240964 "2014-05-08T10:54:29Z")
When we multiply two complex signals in GNU Radio companion and see the result using WX FFT block then there is no frequency difference component(f1-f2) but only the addition component(f1+f2)…why is that?? --- ## [Agenda Announcement/GRCon14 Update](https://www.ruby-forum.com/t/agenda-announcement-grcon14-update/240958)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 8, 2014, 5:44am UTC](https://www.ruby-forum.com/t/agenda-announcement-grcon14-update/240958 "2014-05-08T05:44:37Z")
Greetings, It’s been a few weeks since our last update on GRCon14. Here’s the latest: Conference Agenda is Posted I am happy and proud to announce that the agenda for GNU Radio Conference 2014 has been posted. We … --- ## [FindICE.cmake](https://www.ruby-forum.com/t/findice-cmake/240804)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 8, 2014, 3:24am UTC](https://www.ruby-forum.com/t/findice-cmake/240804 "2014-05-08T03:24:26Z")
I’m trying to build gnu radio with control port, but cmake won’t find my Ice installation. I have Ice-3.4 installed through apt on Ubuntu 13.10. Digging in to the FindIce.cmake I made the following changes: diff --git… --- ## [Re: convert old Gnu Radio applications](https://www.ruby-forum.com/t/re-convert-old-gnu-radio-applications/240955)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 8, 2014, 3:01am UTC](https://www.ruby-forum.com/t/re-convert-old-gnu-radio-applications/240955 "2014-05-08T03:01:02Z")
On Wed, May 7, 2014 at 5:08 PM, 王先达 removed\_email\_address@domain.invalid wrote: Hello Sylvain Thank you very much. But another question i want to ask.Where can i find the document of function and class which are in … --- ## [\[GSoC\] Co-Processors Introduction + Wiki Page](https://www.ruby-forum.com/t/gsoc-co-processors-introduction-wiki-page/240950)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 7, 2014, 10:42pm UTC](https://www.ruby-forum.com/t/gsoc-co-processors-introduction-wiki-page/240950 "2014-05-07T22:42:15Z")
Hello everybody, I’ve been selected for the GSoC project in using the keystone2 as a base to further develop coprocessor integration in gnuradio. My mentor is Philip Balister who mentored last year’s coprocessor proj… --- ## [Out of Tree Block Not Showing up in GRC](https://www.ruby-forum.com/t/out-of-tree-block-not-showing-up-in-grc/240915)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [May 7, 2014, 8:53pm UTC](https://www.ruby-forum.com/t/out-of-tree-block-not-showing-up-in-grc/240915 "2014-05-07T20:53:27Z")
I have two out of tree blocks I want to add to GRC, everything compiles and installs correctly except for the GRC component (not shown in GRC). So this should be an XML issue and I think it is related to my attempts … --- ## [How to convert from message to complex/float](https://www.ruby-forum.com/t/how-to-convert-from-message-to-complex-float/240753)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 7, 2014, 3:50pm UTC](https://www.ruby-forum.com/t/how-to-convert-from-message-to-complex-float/240753 "2014-05-07T15:50:44Z")
Dear List, I’m beginning with gr-mac. (https://github.com/jmalsbury/gr-mac). I need complex/float data to process but some blocks give message as output (Tagged Stream to PDU). I did try using Message Source to conve… --- ## [Python chaos](https://www.ruby-forum.com/t/python-chaos/237842)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 12\ **Last updated:** [May 7, 2014, 3:31pm UTC](https://www.ruby-forum.com/t/python-chaos/237842 "2014-05-07T15:31:36Z")
Hi, I recently installed some stuff on my Opensuse 12.3, including gnuradio and QGis2. When using QT widgets, Gnuradio GRC fails with Traceback (most recent call last): File “/home/sgofferj/top\_block.py”, line 12, i… --- ## [Convert old Gnu Radio applications](https://www.ruby-forum.com/t/convert-old-gnu-radio-applications/240921)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 7, 2014, 11:27am UTC](https://www.ruby-forum.com/t/convert-old-gnu-radio-applications/240921 "2014-05-07T11:27:04Z")
Hello all Now i want to convert old Gnu Radio applications which were developed in the gnuradio 3.3.0 to the gnuradio 3.7.0.Can someone give me some advices on this?Any advices will be appreciated. Thank you very muc… --- ## [USB Hub with software controllable power supply for SDR](https://www.ruby-forum.com/t/usb-hub-with-software-controllable-power-supply-for-sdr/240928)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 7, 2014, 10:51am UTC](https://www.ruby-forum.com/t/usb-hub-with-software-controllable-power-supply-for-sdr/240928 "2014-05-07T10:51:59Z")
Hi all, I’m looking for a USB hub that allows software control of each port. I have a FunCube Dongle Pro+ trying to pick up satellite signals; but as the dongle is plugged in continously, I believe it heats up and deg… --- ## [Questions on stream tags](https://www.ruby-forum.com/t/questions-on-stream-tags/240886)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [May 7, 2014, 9:43am UTC](https://www.ruby-forum.com/t/questions-on-stream-tags/240886 "2014-05-07T09:43:44Z")
Dear List, I’m new to stream tags. Could someone help me to understand about stream tags and know how to use it? In GNU Radio Manual: “A stream tags is generated by a block’s work function and from there on flows t… --- ## [Getting this today from recent GR master build:](https://www.ruby-forum.com/t/getting-this-today-from-recent-gr-master-build/240898)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [May 7, 2014, 9:40am UTC](https://www.ruby-forum.com/t/getting-this-today-from-recent-gr-master-build/240898 "2014-05-07T09:40:03Z")
Traceback (most recent call last): File “/home/mleech/top\_block.py”, line 74, in tb = top\_block() File “/home/mleech/top\_block.py”, line 39, in init channels=range(1), File “/usr/local/lib64/python2.7/site-package… --- ## [Apps/ directory](https://www.ruby-forum.com/t/apps-directory/240941)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 7, 2014, 9:22am UTC](https://www.ruby-forum.com/t/apps-directory/240941 "2014-05-07T09:22:49Z")
Refer http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules#Structure-of-a-module “The apps/ subdir contains any complete applications (both for GRC and standalone executables) which are installed to the… --- ## [Re: New guy having troubles](https://www.ruby-forum.com/t/re-new-guy-having-troubles/240919)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 6, 2014, 5:43pm UTC](https://www.ruby-forum.com/t/re-new-guy-having-troubles/240919 "2014-05-06T17:43:38Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [New guy having troubles](https://www.ruby-forum.com/t/new-guy-having-troubles/240916)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 6, 2014, 5:15pm UTC](https://www.ruby-forum.com/t/new-guy-having-troubles/240916 "2014-05-06T17:15:21Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Constellation plot in c++ using qtgui](https://www.ruby-forum.com/t/constellation-plot-in-c-using-qtgui/240917)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 6, 2014, 5:06pm UTC](https://www.ruby-forum.com/t/constellation-plot-in-c-using-qtgui/240917 "2014-05-06T17:06:08Z")
hello everybody, I wanted to use constellation plot of gnuradio in my top block in c++. I actually use qtcreator in ubuntu and gnuradio 3.7.3. After I found out that I must add “-lgnuradio-qtgui” to the .pro file of … --- ## [Using qtgui for plotting constellations](https://www.ruby-forum.com/t/using-qtgui-for-plotting-constellations/240910)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 6, 2014, 12:27pm UTC](https://www.ruby-forum.com/t/using-qtgui-for-plotting-constellations/240910 "2014-05-06T12:27:16Z")
hello everybody, I wanted to use constellation plot of gnuradio in my top block in c++. I actually use qtcreator in ubuntu and gnuradio 3.7.3. After I found out that I must add “-lgnuradio-qtgui” to the .pro file of q… --- ## [Gr-uhd GR3.7.X on Fedora 14](https://www.ruby-forum.com/t/gr-uhd-gr3-7-x-on-fedora-14/240902)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 6, 2014, 4:53am UTC](https://www.ruby-forum.com/t/gr-uhd-gr3-7-x-on-fedora-14/240902 "2014-05-06T04:53:20Z")
Anyone else out there successfully using gr-uhd blocks successfully on a Fedora 14 system? --- ## [Signal drought](https://www.ruby-forum.com/t/signal-drought/240899)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 11\ **Last updated:** [May 6, 2014, 3:21am UTC](https://www.ruby-forum.com/t/signal-drought/240899 "2014-05-06T03:21:05Z")
Hi, I built all the code today using the build-gnuradio script and when I create a simple GRC flow graph going from the USRP source to the waterfall plot, I get no data coming in. I then built gqrx and ran it and it … --- ## [Uhd\_find\_devices cannot find my B210](https://www.ruby-forum.com/t/uhd-find-devices-cannot-find-my-b210/240895)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 5, 2014, 8:27pm UTC](https://www.ruby-forum.com/t/uhd-find-devices-cannot-find-my-b210/240895 "2014-05-05T20:27:32Z")
Hi, I received my B210 this morning and when I run uhd\_find\_devices, it say it can’t find any devices. $ uhd\_find\_devices linux; GNU C++ version 4.8.1; Boost\_105300; UHD\_003.005.003-0-unknown No UHD Devices Found l… --- ## [PSK Demodulator performance](https://www.ruby-forum.com/t/psk-demodulator-performance/240861)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 5, 2014, 1:19pm UTC](https://www.ruby-forum.com/t/psk-demodulator-performance/240861 "2014-05-05T13:19:24Z")
Does anyone have any information on the performance - specifically the implementation loss of the Gnuradio PSK demodulator block? I am trying to work out a link budget. Typically this would be 1dB or so from ideal. M… --- ## [Re: Should return the number of input or the number of output?](https://www.ruby-forum.com/t/re-should-return-the-number-of-input-or-the-number-of-output/240871)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 5, 2014, 2:10am UTC](https://www.ruby-forum.com/t/re-should-return-the-number-of-input-or-the-number-of-output/240871 "2014-05-05T02:10:54Z")
On Sun, May 4, 2014 at 4:39 PM, Marcus Müller removed\_email\_address@domain.invalidwrote: Marcus This sink block needs to produce an 8-bit integer from every 9 elements it receives. The below two commands will be … --- ## [Re: Should return the number of input or the number of output?](https://www.ruby-forum.com/t/re-should-return-the-number-of-input-or-the-number-of-output/240868)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 4, 2014, 10:40am UTC](https://www.ruby-forum.com/t/re-should-return-the-number-of-input-or-the-number-of-output/240868 "2014-05-04T10:40:16Z")
Part of this question has been partially discussed, as below. On Mon, Mar 10, 2014 at 9:18 PM, Martin B. removed\_email\_address@domain.invalidwrote: OK, I admit I was unclear. Let’s try from scratch: The return func… --- ## [About the decoding result of gr-air-modes](https://www.ruby-forum.com/t/about-the-decoding-result-of-gr-air-modes/240863)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 4, 2014, 10:03am UTC](https://www.ruby-forum.com/t/about-the-decoding-result-of-gr-air-modes/240863 "2014-05-04T10:03:54Z")
Hi all, I install the gr-air modes. And the hardware I am using is USRP N210 without GPSDO. The command I am using is the default command of the modes\_rx module. And after I run this module, I got the following Resul… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=73) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=75)