# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=18 [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:** 19 --- ## [SOCIS project update 2](https://www.ruby-forum.com/t/socis-project-update-2/242294)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 12, 2015, 6:52pm UTC](https://www.ruby-forum.com/t/socis-project-update-2/242294 "2015-06-12T18:52:13Z")
Hey GNU Radio’ers! Another week has passed. Thus, it’s time for my next project update. The week started with a fairly good event. I found a bug in the decoder which led to incorrect results. I studied various papers… --- ## [Receiving a sinusoidal with two USRP N200 connected by MIMO cable](https://www.ruby-forum.com/t/receiving-a-sinusoidal-with-two-usrp-n200-connected-by-mimo-cable/242293)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 12, 2015, 12:42pm UTC](https://www.ruby-forum.com/t/receiving-a-sinusoidal-with-two-usrp-n200-connected-by-mimo-cable/242293 "2015-06-12T12:42:34Z")
Hi all! I would need some help with the development of my project. I am trying to do some MIMO development. First step was to transmit a single sinusoid by means of an USRP N200. The receiver part consist of two USRP … --- ## [M.data in usrp\_spectrum\_sense.py](https://www.ruby-forum.com/t/m-data-in-usrp-spectrum-sense-py/242268)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 12, 2015, 9:34am UTC](https://www.ruby-forum.com/t/m-data-in-usrp-spectrum-sense-py/242268 "2015-06-12T09:34:17Z")
I have been running usrp\_spectrum\_sense.py for hours now and I cannot figure out where it is getting its power\_db from. I narrowed it down to m.data. My end goal is to have the program scan frequencies from a desired … --- ## [Gnuradio FFT - Graph concatenation](https://www.ruby-forum.com/t/gnuradio-fft-graph-concatenation/242280)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [June 11, 2015, 11:43pm UTC](https://www.ruby-forum.com/t/gnuradio-fft-graph-concatenation/242280 "2015-06-11T23:43:40Z")
Hi, I’m using USRP E310 and running uhd\_fft.grc to acquire FFT spectrum from the device in network mode, and then displays that with QT FFT GUI block. Setting a center frequency, I can get an instantaneous bandwidth … --- ## [Gnuradio and qt](https://www.ruby-forum.com/t/gnuradio-and-qt/242278)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 11, 2015, 3:29pm UTC](https://www.ruby-forum.com/t/gnuradio-and-qt/242278 "2015-06-11T15:29:26Z")
Support for qt4 will end at the end of this year. I think this is not a real problem at the moment, but are there plans to migrate to qt5 ? Thanks – Volker --- ## [USRP Handshake](https://www.ruby-forum.com/t/usrp-handshake/242269)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [June 11, 2015, 12:03am UTC](https://www.ruby-forum.com/t/usrp-handshake/242269 "2015-06-11T00:03:54Z")
Hello everyone, I try to transmitting a file using PSK modulation with 2 x USRP B200 as Tx and Rx. When I run the Tx’s fg, the Tx only transmitted before the Rx fg completely run. But when I run the Rx’s fg, the file… --- ## [Run to Completion with gr-ieee80211](https://www.ruby-forum.com/t/run-to-completion-with-gr-ieee80211/242195)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 10, 2015, 10:34pm UTC](https://www.ruby-forum.com/t/run-to-completion-with-gr-ieee80211/242195 "2015-06-10T22:34:31Z")
I’ve derived a flow graph, playback\_wifi\_rx\_cli.grc \[1\] from the wifi\_rx example given in gr-ieee80211 \[2\] which is a CLI version taking a sc16-formatted sample file and outputs a .pcap file for wireshark. The goal is… --- ## [Buffer size with timed packets](https://www.ruby-forum.com/t/buffer-size-with-timed-packets/242263)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 10, 2015, 7:24pm UTC](https://www.ruby-forum.com/t/buffer-size-with-timed-packets/242263 "2015-06-10T19:24:39Z")
Hi all, I have a question regarding the timed packets with UHD. Basically I’m sending packets from a burst tagger into my UHD sink with a tx\_time tag, but after a while I’m getting L’s (late packet, if I’m not wrong) … --- ## [Sending data to a server](https://www.ruby-forum.com/t/sending-data-to-a-server/242258)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [June 10, 2015, 7:07pm UTC](https://www.ruby-forum.com/t/sending-data-to-a-server/242258 "2015-06-10T19:07:07Z")
I’m trying to send my recordings from a USRP Source(hardware: NI B200) to a database I set up. I have been searching the internet for hours and I have come up with nothing. There was one post that mentioned it, but o… --- ## [File Reading](https://www.ruby-forum.com/t/file-reading/242253)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 10, 2015, 9:45am UTC](https://www.ruby-forum.com/t/file-reading/242253 "2015-06-10T09:45:53Z")
I am having trouble reading a file and putting it as a variable or some way so that the USRP Source block will read it and evaluate each item. I’m using a file source and i tried connecting to a message sink, but I’m … --- ## [Selling my USRP1 with modified 52Mhz clock](https://www.ruby-forum.com/t/selling-my-usrp1-with-modified-52mhz-clock/242260)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 10, 2015, 6:54am UTC](https://www.ruby-forum.com/t/selling-my-usrp1-with-modified-52mhz-clock/242260 "2015-06-10T06:54:43Z")
Hi list, I am selling my USRP1 with following configuration: USRP1 with 52Mhz modified clock DBSRX1 2 small 0db gain antenna USB cable and power adapter Above items are working in excellent condition, they are not … --- ## [Patches and instructions for adding python and numpy to GNU Radio for android](https://www.ruby-forum.com/t/patches-and-instructions-for-adding-python-and-numpy-to-gnu-radio-for-android/242259)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 10, 2015, 1:14am UTC](https://www.ruby-forum.com/t/patches-and-instructions-for-adding-python-and-numpy-to-gnu-radio-for-android/242259 "2015-06-10T01:14:45Z")
As previously mentioned, I’ve been working on adding python and numpy to the existing GNU Radio android version (GrAnd). I’ve named the resulting Frankensteinian creation “GrAndPy”. The goals of the project (that hav… --- ## [Wav file source question](https://www.ruby-forum.com/t/wav-file-source-question/235852)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 6\ **Last updated:** [June 10, 2015, 12:12am UTC](https://www.ruby-forum.com/t/wav-file-source-question/235852 "2015-06-10T00:12:15Z")
Hi guys, I am playing with gnuradio companion. I have a question on wav file. I play like this first (the samp\_rate set to 32k) Audio Source —\> Wav File Sink; I save the file as test.wav. It sound well. Then, I play… --- ## [Problem with ofdm link](https://www.ruby-forum.com/t/problem-with-ofdm-link/242254)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 9, 2015, 6:32pm UTC](https://www.ruby-forum.com/t/problem-with-ofdm-link/242254 "2015-06-09T18:32:49Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Why can't I compile gr-cdma？](https://www.ruby-forum.com/t/why-cant-i-compile-gr-cdma/242257)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 9, 2015, 4:27pm UTC](https://www.ruby-forum.com/t/why-cant-i-compile-gr-cdma/242257 "2015-06-09T16:27:13Z")
Hi everyone， I cloned the gr-cdma(GitHub - anastas/gr-cdma: a cdma physical layer for Gnuradio). But I can’t compile the code. I followed the complie instructions. After I typed “make”, I got the following errors: \[… --- ## [Question on implementing a state machine](https://www.ruby-forum.com/t/question-on-implementing-a-state-machine/242247)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [June 9, 2015, 2:56pm UTC](https://www.ruby-forum.com/t/question-on-implementing-a-state-machine/242247 "2015-06-09T14:56:03Z")
Hi Please forgive me if the questions are silly/basic. I’ve learnt a lot from replies on this forum and I’m making steps in the right direction, if only baby ones. I am trying to implement a state machine based syn… --- ## [Filename in file source from GRC and automatic clear reports?](https://www.ruby-forum.com/t/filename-in-file-source-from-grc-and-automatic-clear-reports/242248)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 9, 2015, 2:06pm UTC](https://www.ruby-forum.com/t/filename-in-file-source-from-grc-and-automatic-clear-reports/242248 "2015-06-09T14:06:59Z")
It’s not a critical issue. How could I put filename which contains variables? After I define a variable time with a value of 20150609. I want to use a file /my/file/path/sample20150609 as a file source. In file fie… --- ## [GNU radio Installation](https://www.ruby-forum.com/t/gnu-radio-installation/242250)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 9, 2015, 9:18am UTC](https://www.ruby-forum.com/t/gnu-radio-installation/242250 "2015-06-09T09:18:58Z")
Hi List, I am trying to install GNU radio in ubuntu 14.04 with the UHD version 3.8.4. But when i am installing GNU radio, it is by default using older version of UHD and not UHD 3.8.4. How can i install GNU radio on … --- ## [Question about data types while creating blocks](https://www.ruby-forum.com/t/question-about-data-types-while-creating-blocks/242234)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [June 7, 2015, 9:03pm UTC](https://www.ruby-forum.com/t/question-about-data-types-while-creating-blocks/242234 "2015-06-07T21:03:22Z")
Hello I’m trying to create a new block, which one of its output variables is string. I would like to know if that it’s possible or if i should convert it to a integer type. This output is a vector of size 8, each wi… --- ## [\[VOLK\] volk\_profile failures](https://www.ruby-forum.com/t/volk-volk-profile-failures/242230)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [June 6, 2015, 10:52pm UTC](https://www.ruby-forum.com/t/volk-volk-profile-failures/242230 "2015-06-06T22:52:54Z")
I compiled GNU Radio 3.7.7.1 natively on an ODROID XU3-Lite with Ubuntu 14.04.2 LTS. I ran volk\_profile and got a lot of failures for various embedded architectures. Any ideas what could be happening? Could it be some… --- ## [PSK demod](https://www.ruby-forum.com/t/psk-demod/242156)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 6, 2015, 5:41pm UTC](https://www.ruby-forum.com/t/psk-demod/242156 "2015-06-06T17:41:32Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Question developing a new block](https://www.ruby-forum.com/t/question-developing-a-new-block/242215)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 6, 2015, 6:13am UTC](https://www.ruby-forum.com/t/question-developing-a-new-block/242215 "2015-06-06T06:13:23Z")
Hi, i read some tutorials about creating new blocks. Iam asking my self a simple question and i think i couldnt find the answer: How is it possible to fill a python grc variable block with data from another block C+… --- ## [Move USRP LO with USRP sink block?](https://www.ruby-forum.com/t/move-usrp-lo-with-usrp-sink-block/234137)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [June 6, 2015, 2:26am UTC](https://www.ruby-forum.com/t/move-usrp-lo-with-usrp-sink-block/234137 "2015-06-06T02:26:09Z")
Is there a setting to move the USRP LO in the SINK block? Not in code, in the block, I’m am integrating another developers system and need to use the GRC block --- ## [Should Control Ports Work?](https://www.ruby-forum.com/t/should-control-ports-work/242228)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 5, 2015, 10:21pm UTC](https://www.ruby-forum.com/t/should-control-ports-work/242228 "2015-06-05T22:21:22Z")
Hey all, GNU Radio 3.7.7.1, Ubuntu 14.04 Thank you Nathan for giving me that paper on Performance Counters and Control Ports. That is exactly the kind of debug analysis I want to do. I remember a long while back cont… --- ## [What is the difference between Streams To Stream and Streams to Vector](https://www.ruby-forum.com/t/what-is-the-difference-between-streams-to-stream-and-streams-to-vector/242225)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 5, 2015, 9:46pm UTC](https://www.ruby-forum.com/t/what-is-the-difference-between-streams-to-stream-and-streams-to-vector/242225 "2015-06-05T21:46:19Z")
Hi all! I am recording data from two USRP:s and I want to put the data into one file sink. I think I could do it by using the Streams To Vector block and then changing the vector parameter in the file sink to 2. H… --- ## [Core dumped when closing GRC](https://www.ruby-forum.com/t/core-dumped-when-closing-grc/242209)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 5, 2015, 5:36pm UTC](https://www.ruby-forum.com/t/core-dumped-when-closing-grc/242209 "2015-06-05T17:36:17Z")
Hi all, i finally managed to install newest version of gnuradio (3.7.7.1) on mu RHEL6. Everyrhing look sjust fine except segmentation fault when closing GRC. Didi anybody experience something like this and how can I d… --- ## [Re: problem with ofdm bandwidth and sampling rate](https://www.ruby-forum.com/t/re-problem-with-ofdm-bandwidth-and-sampling-rate/242194)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [June 5, 2015, 11:48am UTC](https://www.ruby-forum.com/t/re-problem-with-ofdm-bandwidth-and-sampling-rate/242194 "2015-06-05T11:48:05Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [UDP Source and Sink = "Straight" UDP](https://www.ruby-forum.com/t/udp-source-and-sink-straight-udp/242216)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 4, 2015, 11:37pm UTC](https://www.ruby-forum.com/t/udp-source-and-sink-straight-udp/242216 "2015-06-04T23:37:13Z")
Hello, I just wanted to confirm that the UDP Source and Sink blocks just “chop up” the data to fit inside the payload buffer (who’s size is determine by the PAYLOAD\_SIZE attribute) and do not handle “extra” things i… --- ## [Most affordable UHD compatible SW transmitter](https://www.ruby-forum.com/t/most-affordable-uhd-compatible-sw-transmitter/242162)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [June 4, 2015, 9:14pm UTC](https://www.ruby-forum.com/t/most-affordable-uhd-compatible-sw-transmitter/242162 "2015-06-04T21:14:18Z")
Hi people, Do you know which is the current state of art regarding (low) price of SW SDR transmitter compatible with UHD? It’s for a project for Digital Radio broadcast using DRM standard (10kHz of bandwidth) here … --- ## [Pybombs installed 3.7.7.1 instead of 3.7.8](https://www.ruby-forum.com/t/pybombs-installed-3-7-7-1-instead-of-3-7-8/242211)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 4, 2015, 6:59pm UTC](https://www.ruby-forum.com/t/pybombs-installed-3-7-7-1-instead-of-3-7-8/242211 "2015-06-04T18:59:07Z")
Hello all, Yesterday I did a gnuradio update (./pybombs update) and noticed my version went back a minor version. I had been using 3.7.8 and now I’m using 3.7.7.1. I’ve created flowgraphs using 3.7.8 that are not wo… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=17) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=19)