# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=53 [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:** 54 --- ## [TX Gain parameter in uhd\_siggen\_gui](https://www.ruby-forum.com/t/tx-gain-parameter-in-uhd-siggen-gui/231942)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 9, 2014, 3:30pm UTC](https://www.ruby-forum.com/t/tx-gain-parameter-in-uhd-siggen-gui/231942 "2014-09-09T15:30:50Z")
Hello everyone, Im trying to set the TX Gain of USRP device using the following command while transmitting using uhd\_siggen\_gui tool: ./uhd\_siggen\_gui --sine -g \ -f 1013M --amplitude=1.0 -A TX/RX -v If I se… --- ## [USRP I/O Buffering](https://www.ruby-forum.com/t/usrp-i-o-buffering/231931)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [September 9, 2014, 3:07pm UTC](https://www.ruby-forum.com/t/usrp-i-o-buffering/231931 "2014-09-09T15:07:49Z")
Hello, I have a simple application written in Python using GNURadio. All I am trying to accomplish is to have the USRP data be written to disk. The application works fine when I dump data to /dev/null or run it at … --- ## [Running uhd\_fft with a rtlsdr stick](https://www.ruby-forum.com/t/running-uhd-fft-with-a-rtlsdr-stick/231945)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 8, 2014, 6:03pm UTC](https://www.ruby-forum.com/t/running-uhd-fft-with-a-rtlsdr-stick/231945 "2014-09-08T18:03:06Z")
is it possible to run uhd\_fft directly from the IQ data coming over usb from an rtlsdr stick? or is this only for use with an ettus usrp device? --- ## [Updating issue in gr-osmosdr](https://www.ruby-forum.com/t/updating-issue-in-gr-osmosdr/231944)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 8, 2014, 5:21pm UTC](https://www.ruby-forum.com/t/updating-issue-in-gr-osmosdr/231944 "2014-09-08T17:21:12Z")
Hi All, I have updated gnuradio to 3.7.5 recently, and then reconfig&rebuild gr-osmosdr to link its lib against to v3.7.5’s gnuradio-runtime.so. But when I import osmosdr, I got below error ImportError: libgnuradio-r… --- ## [Installing gnuradio and gr-osmosdr](https://www.ruby-forum.com/t/installing-gnuradio-and-gr-osmosdr/231943)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 8, 2014, 4:34pm UTC](https://www.ruby-forum.com/t/installing-gnuradio-and-gr-osmosdr/231943 "2014-09-08T16:34:57Z")
having a hard time getting gnuradio to work with my dvb-t usb stick latest attempt has been to move to using pybomb, e.g. originally i installed gnuradio and gnuradio-dev via apt-get install, under ubuntu 14.04 whic… --- ## [Errors in Terminal prior to execution of GNURadio-Companion](https://www.ruby-forum.com/t/errors-in-terminal-prior-to-execution-of-gnuradio-companion/231934)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 8, 2014, 3:14pm UTC](https://www.ruby-forum.com/t/errors-in-terminal-prior-to-execution-of-gnuradio-companion/231934 "2014-09-08T15:14:39Z")
Hi: I am have some problems running GNURadio-Companion on my Quad-core Wandboard (ARM 7i hf) running Ubuntu 14.04. When I execute GNURadio-Companion I get a whole bunch of errors, here is the last few lines: Warning… --- ## [Latency measurements](https://www.ruby-forum.com/t/latency-measurements/231908)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [September 8, 2014, 8:25am UTC](https://www.ruby-forum.com/t/latency-measurements/231908 "2014-09-08T08:25:22Z")
Hi guys, In simulation, sometime we need to measure the latency of a packet in terms of the duration is needed to perform some certain signal processing on the packet. Assume that we have a source which generates pa… --- ## [ALSA device or resource busy](https://www.ruby-forum.com/t/alsa-device-or-resource-busy/231927)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [September 7, 2014, 1:25am UTC](https://www.ruby-forum.com/t/alsa-device-or-resource-busy/231927 "2014-09-07T01:25:36Z")
Hi folks, I got it built and running, and now I have run into this problem: ALSA lib pcm\_dmix.c:1022:(snd\_pcm\_dmix\_open) unable to open slave ALSA lib pcm\_dmix.c:1022:(snd\_pcm\_dmix\_open) unable to open slave OERROR:… --- ## [Undefined symbol when running gnuradio-companion with hackrf](https://www.ruby-forum.com/t/undefined-symbol-when-running-gnuradio-companion-with-hackrf/231919)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 6, 2014, 8:55pm UTC](https://www.ruby-forum.com/t/undefined-symbol-when-running-gnuradio-companion-with-hackrf/231919 "2014-09-06T20:55:39Z")
Hi folks, I managed to get pybombs to install and build on my Fedora 19 system with hackrf and gr-osmosdr. However, when I run with an osmocom source and the HackRF connected I get the following error. Has anyone see… --- ## [Fwd: building gr-osmosdr - cannot find gnuradio](https://www.ruby-forum.com/t/fwd-building-gr-osmosdr-cannot-find-gnuradio/231920)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 6, 2014, 10:51am UTC](https://www.ruby-forum.com/t/fwd-building-gr-osmosdr-cannot-find-gnuradio/231920 "2014-09-06T10:51:16Z")
Sent from my iPod Begin forwarded message: --- ## [GNU Radio Releases 3.7.5 and 3.7.4.1 and Live DVD available for download](https://www.ruby-forum.com/t/gnu-radio-releases-3-7-5-and-3-7-4-1-and-live-dvd-available-for-download/231916)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 6, 2014, 12:48am UTC](https://www.ruby-forum.com/t/gnu-radio-releases-3-7-5-and-3-7-4-1-and-live-dvd-available-for-download/231916 "2014-09-06T00:48:07Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Pybombs install hackrf causes CMake to fail with no suitable type found on CentOS 6.5](https://www.ruby-forum.com/t/pybombs-install-hackrf-causes-cmake-to-fail-with-no-suitable-type-found-on-centos-6-5/231914)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 6, 2014, 12:45am UTC](https://www.ruby-forum.com/t/pybombs-install-hackrf-causes-cmake-to-fail-with-no-suitable-type-found-on-centos-6-5/231914 "2014-09-06T00:45:03Z")
Hi folks, I am trying to build on CentOS 6.5. I cloned the repos, and then issued cd pybombs; ./pybombs install hackrf and it eventually failed with: Current step: (hackrf :: configure) configure (’ \\n CC=gcc C… --- ## [GnuRadio File sink Operation, Need help](https://www.ruby-forum.com/t/gnuradio-file-sink-operation-need-help/231911)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 5, 2014, 6:28pm UTC](https://www.ruby-forum.com/t/gnuradio-file-sink-operation-need-help/231911 "2014-09-05T18:28:06Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Full duplex infinity loop](https://www.ruby-forum.com/t/full-duplex-infinity-loop/231913)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 5, 2014, 5:47pm UTC](https://www.ruby-forum.com/t/full-duplex-infinity-loop/231913 "2014-09-05T17:47:16Z")
Hello, can anyone suggest how to prevent infinity loop in case of full duplex RX/TX on same frequency ? Any ideas? GRC example: UHD source -\> GMSK DEMOD -\> packet decoder -\> packet encoder -\> GMSK MOD -\> UHD SINK b… --- ## [Building gr-osmosdr - cannot find gnuradio](https://www.ruby-forum.com/t/building-gr-osmosdr-cannot-find-gnuradio/231912)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 5, 2014, 5:36pm UTC](https://www.ruby-forum.com/t/building-gr-osmosdr-cannot-find-gnuradio/231912 "2014-09-05T17:36:07Z")
i’m trying to build the gnuradio block from osmocon so i can use an rtlsdr with gnuradio have installed gnuradio for ubuntu 14.04 using apt-get then when i try and build gr-osmosdr i get the following: – Build type n… --- ## [Flow Graph Reconfiguration](https://www.ruby-forum.com/t/flow-graph-reconfiguration/231899)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 5, 2014, 1:25pm UTC](https://www.ruby-forum.com/t/flow-graph-reconfiguration/231899 "2014-09-05T13:25:58Z")
I am trying to setup a flow graph that has 2 states, in which upon a state change the flow graph is reconfigured. FlowGraph 1: \[src\] -\> \[filt\] -\> \[modem-1\] FlowGraph 2: \[src\] -\> \[filt\] -\> \[modem-2\] FG-1 runs to com… --- ## [How to swtich tx/rx of XCVR2450 when using gnuradio OFDM\_benchmark example?](https://www.ruby-forum.com/t/how-to-swtich-tx-rx-of-xcvr2450-when-using-gnuradio-ofdm-benchmark-example/231889)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 5, 2014, 11:28am UTC](https://www.ruby-forum.com/t/how-to-swtich-tx-rx-of-xcvr2450-when-using-gnuradio-ofdm-benchmark-example/231889 "2014-09-05T11:28:49Z")
HI guys, Thanks in advance. Currently I have been engaged in a project which is based on the OFDM\_benchmark example. I plan to realize a round trip communication between two USRP2 node. Concretely, I want to control … --- ## [Undefined symbol: wav\_write\_sample](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 10\ **Last updated:** [September 5, 2014, 1:47am UTC](https://www.ruby-forum.com/t/undefined-symbol-wav-write-sample/231588 "2014-09-05T01:47:16Z")
Hello, I am developing a block. Now it is a copy of Wav File Sink block. It compiles fine but in the GRC gives me the error: ImportError: /usr/local/lib/libgnuradio-MLABlocks.so: undefined symbol: \_ZN2gr6blocks16wav\_… --- ## [ZedBoard GNU Radio image boot problems](https://www.ruby-forum.com/t/zedboard-gnu-radio-image-boot-problems/231880)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 4, 2014, 10:11pm UTC](https://www.ruby-forum.com/t/zedboard-gnu-radio-image-boot-problems/231880 "2014-09-04T22:11:58Z")
I’m trying to boot a ZedBoard with the GNU Radio image here: http://gnuradio.org/data/sdk/zedboard\_armv7a-hf-vfp-neon/. I picked the hard float image even though the tutorial points to the soft float image (http://gnu… --- ## [Gnuradio companion bug](https://www.ruby-forum.com/t/gnuradio-companion-bug/231900)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 4, 2014, 9:22pm UTC](https://www.ruby-forum.com/t/gnuradio-companion-bug/231900 "2014-09-04T21:22:00Z")
Hi guys, everyone has same issue: Created default thread pool with 8 threads. gr\_fir\_fff: using SSE swig/python detected a memory leak of type ‘gr::basic\_block\_sptr \*’, no destructor found. Traceback (most recen… --- ## [USRP N200/N210 SBX carrier recovery](https://www.ruby-forum.com/t/usrp-n200-n210-sbx-carrier-recovery/231893)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 4, 2014, 5:41pm UTC](https://www.ruby-forum.com/t/usrp-n200-n210-sbx-carrier-recovery/231893 "2014-09-04T17:41:27Z")
HI! I have a question about USRP. I am wondering if there is a carrier recovery module in USRP? I did some research and I found that the USRP has PLL and VCO components. But a friend told me such cheap devices like U… --- ## [Minor patch to config file placement](https://www.ruby-forum.com/t/minor-patch-to-config-file-placement/234822)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 4, 2014, 5:07pm UTC](https://www.ruby-forum.com/t/minor-patch-to-config-file-placement/234822 "2014-09-04T17:07:30Z")
Subject: \[PATCH\] gnuradio-runtime: config file placement was not consistent gnuradio-runtime/CMakeLists.txt | 2 ± 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/gnuradio-runtime/CMakeLists.txt b/g… --- ## [Cmake / Could not find a package configuration file provided by "Gnuradio"](https://www.ruby-forum.com/t/cmake-could-not-find-a-package-configuration-file-provided-by-gnuradio/231874)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 4, 2014, 7:37am UTC](https://www.ruby-forum.com/t/cmake-could-not-find-a-package-configuration-file-provided-by-gnuradio/231874 "2014-09-04T07:37:54Z")
Hi, I’ve recently installed gnuradio (3.7.2.1, through apt-get install) on my Ubuntu 14.04. I’d like now to build gr-baz, but cmake returns the following errors: ~/SDR/gr-baz/build$ cmake .. -- Build type not speci… --- ## [Cmake Error](https://www.ruby-forum.com/t/cmake-error/231834)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 4, 2014, 4:35am UTC](https://www.ruby-forum.com/t/cmake-error/231834 "2014-09-04T04:35:48Z")
Hi,GR, I’m trying to use cmake to build gr-ieee802.11 project. But I had following error: CMake Warning at CMakeLists.txt:85 (find\_package): By not providing “FindCppUnit.cmake” in CMAKE\_MODULE\_PATH this project ha… --- ## [How to stop a flowgraph](https://www.ruby-forum.com/t/how-to-stop-a-flowgraph/231862)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 3, 2014, 8:02pm UTC](https://www.ruby-forum.com/t/how-to-stop-a-flowgraph/231862 "2014-09-03T20:02:12Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [How to create a custom header derived from packet\_header\_default.h](https://www.ruby-forum.com/t/how-to-create-a-custom-header-derived-from-packet-header-default-h/231869)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 3, 2014, 6:57pm UTC](https://www.ruby-forum.com/t/how-to-create-a-custom-header-derived-from-packet-header-default-h/231869 "2014-09-03T18:57:00Z")
I am trying to create a custom header format derived from packet\_header\_default.h. I am also doing this in an out of tree module src structure. I have successfully got it to compile the c++ code but it now fails when… --- ## [PSK demodulator and Doppler](https://www.ruby-forum.com/t/psk-demodulator-and-doppler/231848)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [September 3, 2014, 5:57pm UTC](https://www.ruby-forum.com/t/psk-demodulator-and-doppler/231848 "2014-09-03T17:57:54Z")
I am trying to develop a satellite ground station using the PSK demodulator block. This works fine when tuned accurately. However, with low satellites there is quite a bit of Doppler at VHF / UHF and there is also so… --- ## [Root\_raised\_cosine principle](https://www.ruby-forum.com/t/root-raised-cosine-principle/231822)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 3, 2014, 3:53pm UTC](https://www.ruby-forum.com/t/root-raised-cosine-principle/231822 "2014-09-03T15:53:27Z")
Hi, I get the source code of root\_raised\_cosine function in gr\_firdes.cc, but I can’t understand why it writes in that way, is there any paper can give me more details about the principle of root\_raised\_cosine Thank … --- ## [Integral frequency shift correcting in ofdm\_frame\_equalizer\_vcvc\_impl.cc](https://www.ruby-forum.com/t/integral-frequency-shift-correcting-in-ofdm-frame-equalizer-vcvc-impl-cc/231841)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 3, 2014, 3:25pm UTC](https://www.ruby-forum.com/t/integral-frequency-shift-correcting-in-ofdm-frame-equalizer-vcvc-impl-cc/231841 "2014-09-03T15:25:23Z")
Hi All, I found “ofdm\_frame\_equalizer\_vcvc\_impl.cc” use below code to correct integral freq shift(IFO) in freq domain, but as I known, the IFO only cause signal cyclic shifting in freq domain, why this block use gr\_ex… --- ## [Installing gnuradio when Python is installed at custom location](https://www.ruby-forum.com/t/installing-gnuradio-when-python-is-installed-at-custom-location/231811)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [September 1, 2014, 6:57pm UTC](https://www.ruby-forum.com/t/installing-gnuradio-when-python-is-installed-at-custom-location/231811 "2014-09-01T18:57:20Z")
Hi,I am trying to install gnuradio on Kubuntu 14.04 64 bit. I am using the binaries from the main Ubuntu software repository to install the same by running the following: sudo apt-get install gnuradioThe installation … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=52) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=54)