# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=50 [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:** 51 --- ## [Circular dependency caught in sort\_variables only String type](https://www.ruby-forum.com/t/circular-dependency-caught-in-sort-variables-only-string-type/232368)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [October 7, 2014, 6:14pm UTC](https://www.ruby-forum.com/t/circular-dependency-caught-in-sort-variables-only-string-type/232368 "2014-10-07T18:14:23Z")
Hi, I’m getting this error with string type variables using gnuradio 3.7.5 and I cannot figure out how to solve it. I’m using a normal variable plus a config variable in this way: Variable: id: variable\_A value: c… --- ## [GNURadio or Labview interface to USRP N210/N200](https://www.ruby-forum.com/t/gnuradio-or-labview-interface-to-usrp-n210-n200/232396)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 7, 2014, 3:46pm UTC](https://www.ruby-forum.com/t/gnuradio-or-labview-interface-to-usrp-n210-n200/232396 "2014-10-07T15:46:35Z")
Hello All, I have Ettus R. N210 and N200. I have been running GNURadio on USRP. I wanted to experiment with LabView. I have two questions, Is it possible to run the firmware given by NI in the below link on N210 o… --- ## [Source code of the block "WX GUI FFT Sink"](https://www.ruby-forum.com/t/source-code-of-the-block-wx-gui-fft-sink/232387)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 7, 2014, 9:42am UTC](https://www.ruby-forum.com/t/source-code-of-the-block-wx-gui-fft-sink/232387 "2014-10-07T09:42:05Z")
Hi all: Thanks in advance.I want to ask two questions: 1.Where is the source code of the block “WX GUI FFT Sink”?How does it calculate the power? 2.Which version of the gnuradio start to support the USRP N210?I just… --- ## [Windows audio-in and compilation issues](https://www.ruby-forum.com/t/windows-audio-in-and-compilation-issues/232389)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 7, 2014, 5:35am UTC](https://www.ruby-forum.com/t/windows-audio-in-and-compilation-issues/232389 "2014-10-07T05:35:03Z")
Dear list, I’m having lots of problems getting Gnuradio to work in Windows to process signals from a soundcard audio source. Please help! This is what I’ve tried so far: Pre-built binaries ==\> Audio source not work… --- ## [Downsampling in GNURadio](https://www.ruby-forum.com/t/downsampling-in-gnuradio/232380)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 6, 2014, 11:57pm UTC](https://www.ruby-forum.com/t/downsampling-in-gnuradio/232380 "2014-10-06T23:57:28Z")
Hi, I would like to downsample a signal from 390,625 Hz to \*125 \*Hz. \*What is the best way to do this in GNURadio? \* Please find below some issues I am having with this. First, I used the Low Pass Filter block, in G… --- ## [CGRAN down indefinitely, but hopefully not for long (want feedback)](https://www.ruby-forum.com/t/cgran-down-indefinitely-but-hopefully-not-for-long-want-feedback/232277)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 19\ **Last updated:** [October 6, 2014, 9:24pm UTC](https://www.ruby-forum.com/t/cgran-down-indefinitely-but-hopefully-not-for-long-want-feedback/232277 "2014-10-06T21:24:26Z")
The machine that runs CGRAN down in some basement somewhere at Carnegie Mellon has hit some issues again. Given that I’m no longer at the university, these issues are becoming harder for me to address. At this point… --- ## [Sample rate](https://www.ruby-forum.com/t/sample-rate/232369)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [October 6, 2014, 4:19pm UTC](https://www.ruby-forum.com/t/sample-rate/232369 "2014-10-06T16:19:29Z")
Hi all: Thanks in advance. Example:gnuradio/gr-digital/examples/ofdm/rx\_ofdm.grc. If I set the sample rate of usrp equal to 1Msps,then what is the sample rate of the output of the FFT block?Thank you very much. Best… --- ## [TVRX2 and GRC](https://www.ruby-forum.com/t/tvrx2-and-grc/232349)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [October 5, 2014, 2:02pm UTC](https://www.ruby-forum.com/t/tvrx2-and-grc/232349 "2014-10-05T14:02:39Z")
Hello, We have a new TVRX2, which we are using with a N200 USRP. The N200 has a GPSDO. The system seems to work fine when we test it with uhd\_fft. However, we are having trouble figuring out the correct configura… --- ## [GRC 3.6 / 802.11 a/g test signal](https://www.ruby-forum.com/t/grc-3-6-802-11-a-g-test-signal/232315)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [October 5, 2014, 1:03pm UTC](https://www.ruby-forum.com/t/grc-3-6-802-11-a-g-test-signal/232315 "2014-10-05T13:03:45Z")
Greetings engi’s! I’m currently working on my masters (802.11 wlan receiver with MATLAB/USRPN210). After creating all the important stuff ie: -symbol finder -time synchronization -coarse and fine frequency compensat… --- ## [Re: Bypass work function](https://www.ruby-forum.com/t/re-bypass-work-function/232357)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 5, 2014, 12:48pm UTC](https://www.ruby-forum.com/t/re-bypass-work-function/232357 "2014-10-05T12:48:51Z")
Well, in my case the tx/rx would not be stationary, so the channel is not quite. – Bob --- ## [GRC now confused about source/sink sizes](https://www.ruby-forum.com/t/grc-now-confused-about-source-sink-sizes/232354)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 5, 2014, 6:53am UTC](https://www.ruby-forum.com/t/grc-now-confused-about-source-sink-sizes/232354 "2014-10-05T06:53:42Z")
\[This is with latest master: 3.7.6git-57-g029079cf\] If you pull simple\_ra from cgran: svn co https://www.cgran.org/svn/projects/simple\_ra go into simple\_ra/trunk And do a “make” It will fail. If you then: PYTHONP… --- ## [BPSK Transmitter](https://www.ruby-forum.com/t/bpsk-transmitter/232346)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [October 5, 2014, 5:45am UTC](https://www.ruby-forum.com/t/bpsk-transmitter/232346 "2014-10-05T05:45:07Z")
Hi , I am trying to implement BPSK transceiver system on a USRP without the predefined blocks . I am currently testing my design using a file source ( as shown in the attachment) but i am not able to receive the sam… --- ## [Difference between QT/WX](https://www.ruby-forum.com/t/difference-between-qt-wx/232348)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [October 4, 2014, 1:47am UTC](https://www.ruby-forum.com/t/difference-between-qt-wx/232348 "2014-10-04T01:47:12Z")
Hi all , A basic doubt , i have been having since i started working on GR was what is the difference between QT and WX GUIs ? Thanks --- ## [Struggling with 16QAM \<--\> UDP](https://www.ruby-forum.com/t/struggling-with-16qam-udp/232343)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 3, 2014, 5:53pm UTC](https://www.ruby-forum.com/t/struggling-with-16qam-udp/232343 "2014-10-03T17:53:14Z")
Good Day, The overarching goal of my project is to build and test a one-way transmitter/receiver pair. The bare-bones block diagram is UDP input --\> 16QAM modulation --\> bladeRF Tx --\> channel —\> bladeRF Rx --\> polyp… --- ## [Fwd: QT sink in xmlrpc client](https://www.ruby-forum.com/t/fwd-qt-sink-in-xmlrpc-client/232265)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 2, 2014, 6:48pm UTC](https://www.ruby-forum.com/t/fwd-qt-sink-in-xmlrpc-client/232265 "2014-10-02T18:48:22Z")
Hi, I have gnuradio running in a device with no gui. I’ve added a xmlrcp\_server to that computer and a xmlrpc\_client to my desktop to control the variables. I would like to add a QT GUI Sink to visualize data in the … --- ## [Using Microtelecom Perseus with GNU Radio](https://www.ruby-forum.com/t/using-microtelecom-perseus-with-gnu-radio/232319)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 2, 2014, 6:12pm UTC](https://www.ruby-forum.com/t/using-microtelecom-perseus-with-gnu-radio/232319 "2014-10-02T18:12:01Z")
Dear all, Is there a GNU Radio library that can be used for Microtelecom Perseus SDR? I could find only an old code at GitHub - IW0HDV/gnuradio-amontefusco: Perseus support for GNU Radio : this software has been supe… --- ## [Possible bug in tag-\>srcid processing](https://www.ruby-forum.com/t/possible-bug-in-tag-srcid-processing/232221)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [October 2, 2014, 6:07pm UTC](https://www.ruby-forum.com/t/possible-bug-in-tag-srcid-processing/232221 "2014-10-02T18:07:29Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: top block edge list](https://www.ruby-forum.com/t/re-top-block-edge-list/232323)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 2, 2014, 4:30pm UTC](https://www.ruby-forum.com/t/re-top-block-edge-list/232323 "2014-10-02T16:30:49Z")
Hey Jeff, I had previously found those two options but was unsure if I was missing anything else. dot\_graph() seemed like a good option but it doesn’t have the block port information, like the term “dot graph” implie… --- ## [Re: Bypass work function](https://www.ruby-forum.com/t/re-bypass-work-function/232313)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 2, 2014, 1:10pm UTC](https://www.ruby-forum.com/t/re-bypass-work-function/232313 "2014-10-02T13:10:54Z")
I applied this and this is useful in condition when you do not want to process noise, because it is being multiplied by zero when there is no signal. But I want that CMA taps remain unchanged when there is no signal … --- ## [Variable @FSM\_FILE\_INSTALL\_DIR@ does not evaluate in grc](https://www.ruby-forum.com/t/variable-fsm-file-install-dir-does-not-evaluate-in-grc/232312)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 2, 2014, 2:57am UTC](https://www.ruby-forum.com/t/variable-fsm-file-install-dir-does-not-evaluate-in-grc/232312 "2014-10-02T02:57:30Z")
From the latest master, when I run one of the examples in gr-trellis/examples/grc, the value of the parameter “prefix” which is set to @FSM\_FILE\_INSTALL\_DIR@ does not evaluate… Can someone confirm? Is there somethi… --- ## [Top block edge list](https://www.ruby-forum.com/t/top-block-edge-list/232310)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 2, 2014, 12:52am UTC](https://www.ruby-forum.com/t/top-block-edge-list/232310 "2014-10-02T00:52:38Z")
Hello All, I’m trying to access the data inside the top block class, from a custom function or at the very least print out some of it as a test. Is there a way to see the data in the top block edge\_list() before runni… --- ## [GNU radio Image for NI-USRP 2943](https://www.ruby-forum.com/t/gnu-radio-image-for-ni-usrp-2943/232306)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 1, 2014, 6:47pm UTC](https://www.ruby-forum.com/t/gnu-radio-image-for-ni-usrp-2943/232306 "2014-10-01T18:47:01Z")
Hi community , I was wondering if there is a FPGA image compatible with the NI-USRP 2943 available ? and how do i backup the pre-installed NI fpga image . Thanks --- ## [Mulitple USRP Stream Confusion](https://www.ruby-forum.com/t/mulitple-usrp-stream-confusion/232290)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [October 1, 2014, 3:49pm UTC](https://www.ruby-forum.com/t/mulitple-usrp-stream-confusion/232290 "2014-10-01T15:49:12Z")
Hello! I am having trouble trying to create a continuous stream of complex shorts from multiple (2) X310 USRPs (each running 2 channels) over a single 1gigE switch (at a very low sampling rate); currently it appears … --- ## [Error: undefined symbol: volk\_malloc](https://www.ruby-forum.com/t/error-undefined-symbol-volk-malloc/232222)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 10\ **Last updated:** [September 30, 2014, 4:47pm UTC](https://www.ruby-forum.com/t/error-undefined-symbol-volk-malloc/232222 "2014-09-30T16:47:36Z")
Dear all, I had gnuradio-3.7.3 running normally. However, now everytime I run a flowgraph in GRC, it stops and throws an error: Traceback (most recent call last): File “/home/khachoang/GNU\_Radio/test\_grc/2Node\_NoCon… --- ## [How to import in Gnu Radio IQ.wav files recorder with SDR#?](https://www.ruby-forum.com/t/how-to-import-in-gnu-radio-iq-wav-files-recorder-with-sdr/232279)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 30, 2014, 4:15pm UTC](https://www.ruby-forum.com/t/how-to-import-in-gnu-radio-iq-wav-files-recorder-with-sdr/232279 "2014-09-30T16:15:08Z")
Hi, I have recorded with FCD pro+ and SRD# some IQ.wav files. When I try to import them in Gnu Radio companion as a “File source” and plot the frequency spectrum with the “FFt sink” I get nothing. Are the IQ.wav file… --- ## [New to Gnuradio, couple of questions](https://www.ruby-forum.com/t/new-to-gnuradio-couple-of-questions/232280)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [September 29, 2014, 11:17pm UTC](https://www.ruby-forum.com/t/new-to-gnuradio-couple-of-questions/232280 "2014-09-29T23:17:30Z")
I’m trying to become familiar with gnuradio, starting with grc, but I’ve run into a couple of stumbling blocks. I’m using a USRP1 with an assortment of daughter boards, including LF-HF and VHF capabilities. I’d like t… --- ## [\[GRCWG\] Call on October 1](https://www.ruby-forum.com/t/grcwg-call-on-october-1/232278)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [September 29, 2014, 8:26pm UTC](https://www.ruby-forum.com/t/grcwg-call-on-october-1/232278 "2014-09-29T20:26:15Z")
Hey, the GRC Working Group is meeting on October 1 2014, 7pm CEST. I have added an event+hangout on G+. Agenda (and Notes) can be found in the wiki \[0\] Sebastian \[0\] http://gnuradio.org/redmine/projects/gnuradio/wik… --- ## [Small example - using UHD function](https://www.ruby-forum.com/t/small-example-using-uhd-function/232276)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 29, 2014, 7:09pm UTC](https://www.ruby-forum.com/t/small-example-using-uhd-function/232276 "2014-09-29T19:09:05Z")
Hello everyone, It’s a bit of time that I try to use the functions of class UHD, but unfortunately without success. I have prepared a small example in which you can reproduce the error obtained when launching the sim… --- ## [Re: Bypass work function](https://www.ruby-forum.com/t/re-bypass-work-function/232272)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 29, 2014, 4:21pm UTC](https://www.ruby-forum.com/t/re-bypass-work-function/232272 "2014-09-29T16:21:17Z")
Hi thanks for your comment. block2 is the gnuradio “CMA equalizer block”. I want the CMA block to remain quiet when there is no signal of interest. Bob Bob, --- ## [Clean uninstall of Gnuradio and Pybombs](https://www.ruby-forum.com/t/clean-uninstall-of-gnuradio-and-pybombs/232252)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 29, 2014, 6:12am UTC](https://www.ruby-forum.com/t/clean-uninstall-of-gnuradio-and-pybombs/232252 "2014-09-29T06:12:14Z")
Hello all, I am very new to gnuradio, so please excuse a basic question. I managed to install pybombs and gnuradio on my Ubuntu platform in several attempts. Various permissions issues got in the way and I ended up w… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=49) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=51)