# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=34 [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:** 35 --- ## [Trouble with SWIG for packet\_formatter\_default child class](https://www.ruby-forum.com/t/trouble-with-swig-for-packet-formatter-default-child-class/234316)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [February 24, 2015, 4:35pm UTC](https://www.ruby-forum.com/t/trouble-with-swig-for-packet-formatter-default-child-class/234316 "2015-02-24T16:35:04Z")
Hi all - I’m working on Tom’s packet\_handling branch (GitHub - trondeau/gnuradio: GNU Radio) and building a custom packet formatter. Everything works in C++ land, including QA code. However, SWIG is complaining about… --- ## [Triggering USRP at given GPS time from GNU Radio](https://www.ruby-forum.com/t/triggering-usrp-at-given-gps-time-from-gnu-radio/234317)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 24, 2015, 2:58pm UTC](https://www.ruby-forum.com/t/triggering-usrp-at-given-gps-time-from-gnu-radio/234317 "2015-02-24T14:58:20Z")
Hi all, Whenever I want to trigger USRP with at given time with use of a GPSDO I’m adding something like this at the end of a constructor of a topblock generated by gnuradio-companion: if start\_time!="": … --- ## [X300 unknown product code in EEPROM: 2104](https://www.ruby-forum.com/t/x300-unknown-product-code-in-eeprom-2104/234313)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 24, 2015, 1:43pm UTC](https://www.ruby-forum.com/t/x300-unknown-product-code-in-eeprom-2104/234313 "2015-02-24T13:43:52Z")
Dose any one know what is the problem with this device.Hardware NI USRP 2940R = x310OS Ubuntu 14.04LTSConnection SFP0 what are these warnings X300 unknown product code in EEPROM: 2104 RX dboard ID: Unknown (0xffff… --- ## [Project enquiry/interest](https://www.ruby-forum.com/t/project-enquiry-interest/234285)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [February 24, 2015, 9:22am UTC](https://www.ruby-forum.com/t/project-enquiry-interest/234285 "2015-02-24T09:22:39Z")
Hi, I am looking for some references on the following subject. Simultaneous transmissions, multiple users transmitting and receiving on the same channel frequency simultaneously, Multi user detection, etc. Is there … --- ## [FOSDEM 2015 videos -- not quite there, but close](https://www.ruby-forum.com/t/fosdem-2015-videos-not-quite-there-but-close/234318)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 23, 2015, 11:36pm UTC](https://www.ruby-forum.com/t/fosdem-2015-videos-not-quite-there-but-close/234318 "2015-02-23T23:36:25Z")
Videos from this year’s FOSDEM are starting to trickle in. You can find them at \[1\], but I’ll (or we’ll) try and keep \[2\] up to date, as well. Cheers, Martin \[1\] FOSDEM - video recordings \[2\] http://gnuradio.org/red… --- ## [Timed dual channel B210 capture gives error "UHD source block got error code 0x2" (ERROR\_CODE\_LATE\_C](https://www.ruby-forum.com/t/timed-dual-channel-b210-capture-gives-error-uhd-source-block-got-error-code-0x2-error-code-late-c/234300)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 23, 2015, 11:34pm UTC](https://www.ruby-forum.com/t/timed-dual-channel-b210-capture-gives-error-uhd-source-block-got-error-code-0x2-error-code-late-c/234300 "2015-02-23T23:34:06Z")
When you start a dual channel timed capture in the near future with a B210, the work method of usrp\_source\_impl.cc prints out “UHD source block got error code 0x2” error codes are defined in: metadata.hpp line 99: /… --- ## [Asking help for "gr-ieee802-11"](https://www.ruby-forum.com/t/asking-help-for-gr-ieee802-11/234312)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 23, 2015, 5:51pm UTC](https://www.ruby-forum.com/t/asking-help-for-gr-ieee802-11/234312 "2015-02-23T17:51:24Z")
Hello all, I would like to know if its possible to use random data in the gr-ieee802-11 module. Currently, a message strobe feeds “Hello World!” into the module. Any feedback will be appreciated. Thanks kc --- ## [Creating and importing a new python block](https://www.ruby-forum.com/t/creating-and-importing-a-new-python-block/234311)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 23, 2015, 4:57pm UTC](https://www.ruby-forum.com/t/creating-and-importing-a-new-python-block/234311 "2015-02-23T16:57:15Z")
Hello, I tried to build my first custom block. Very easy. It just generates one tune msg every 5 seconds. I followed steps of writing an OOT block in python: http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTr… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/234306)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 23, 2015, 3:07pm UTC](https://www.ruby-forum.com/t/no-subject/234306 "2015-02-23T15:07:22Z")
sir, I created a LPF block…when I execute " make test" command it shows the error like this: 2: Test command: /bin/sh “/home/lekha/gr-filters/build/python/qa\_lpf\_test.sh” 2: Test timeout computed to be: 9.99988e+06 … --- ## [OP25 FSK4 Demodulator Error](https://www.ruby-forum.com/t/op25-fsk4-demodulator-error/234299)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 23, 2015, 1:32pm UTC](https://www.ruby-forum.com/t/op25-fsk4-demodulator-error/234299 "2015-02-23T13:32:45Z")
I’m trying to get my OP25 flowgraph to work. I am having some issues with the FSK4 demodulator and the OP25 Decoder (Combined) blocks. When I run the flowgraph, I get the error “Exception: Could not find a FSK4 demod… --- ## [Msg passing + tag streaming: Is this flowgraph possible?](https://www.ruby-forum.com/t/msg-passing-tag-streaming-is-this-flowgraph-possible/234274)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [February 23, 2015, 9:02am UTC](https://www.ruby-forum.com/t/msg-passing-tag-streaming-is-this-flowgraph-possible/234274 "2015-02-23T09:02:24Z")
Hello, I would like to run a flowgraph similar to the one I attach in a picture. It would work as follows: USRP source would send frames with tags indicating the “rx\_freq” of these samples. Then the power of those … --- ## [Re: OP25 FSK4 Demodulator Error](https://www.ruby-forum.com/t/re-op25-fsk4-demodulator-error/234302)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 23, 2015, 4:52am UTC](https://www.ruby-forum.com/t/re-op25-fsk4-demodulator-error/234302 "2015-02-23T04:52:37Z")
Firstly, the current gr-op25 recipe in pybombs will build a version of OP25 that’s compatible only with GNU Radio version 3.7. (If one really wanted to build OP25 for GR3.6 he could pull the old SVN repo which is st… --- ## [Xmlrpc server/client](https://www.ruby-forum.com/t/xmlrpc-server-client/234301)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 23, 2015, 3:55am UTC](https://www.ruby-forum.com/t/xmlrpc-server-client/234301 "2015-02-23T03:55:28Z")
Hello, can anyone explain to me exactly how the XMLPRC SERVER/CLIENT BLOCK works in GNURADIO. I have tried to google it but still dont quite understand it. From what I got from google, its used for applications to com… --- ## [Pybombs Issue](https://www.ruby-forum.com/t/pybombs-issue/234294)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 21, 2015, 8:12pm UTC](https://www.ruby-forum.com/t/pybombs-issue/234294 "2015-02-21T20:12:32Z")
Is anoyone else experiencing pybombs issues when trying to run app\_store (getting failed to load recipe errors) or even simple command “./pybombs env” wont load. --- ## [QT GUI Frequency Sink and real inputs labels are wrong for FFT length != 1024](https://www.ruby-forum.com/t/qt-gui-frequency-sink-and-real-inputs-labels-are-wrong-for-fft-length-1024/234291)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 21, 2015, 5:12pm UTC](https://www.ruby-forum.com/t/qt-gui-frequency-sink-and-real-inputs-labels-are-wrong-for-fft-length-1024/234291 "2015-02-21T17:12:53Z")
If one selects real input on a QT GUI Frequency sink, and also selects half-width, and also has an FFT size != 1024, then the X-axis labels are wrong. If using an FFT length of 1024, the X axis labels proceed from 0 t… --- ## [Newbie problem](https://www.ruby-forum.com/t/newbie-problem/234252)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [February 21, 2015, 5:23am UTC](https://www.ruby-forum.com/t/newbie-problem/234252 "2015-02-21T05:23:53Z")
I was excited to successfully try an rtl-sdr GRC demo/tutorial and decided to start following the gnuradio tutorials to better learn the program. I quickly ran into trouble, so am sure I’ve done something stupid but … --- ## [Pybombs](https://www.ruby-forum.com/t/pybombs/234278)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 20, 2015, 6:17pm UTC](https://www.ruby-forum.com/t/pybombs/234278 "2015-02-20T18:17:00Z")
It doesn’t play any role whether or not I type sudo before ./app\_store.py getting the same output, I have tried to change the prefix with the same result, so not quite sure what is is causing this error --- ## [Code of USRP experimental setup of full-duplex radio](https://www.ruby-forum.com/t/code-of-usrp-experimental-setup-of-full-duplex-radio/234261)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 20, 2015, 1:00pm UTC](https://www.ruby-forum.com/t/code-of-usrp-experimental-setup-of-full-duplex-radio/234261 "2015-02-20T13:00:39Z")
Hi everyone, I should create a testbed with USRP2 devices or stimulate a full-duplex environment with ns-2. So, I need the code of experimental setup to implement a practical 802.15.4 full-duplex radio or any full-dup… --- ## [How to schedule iq recordings?](https://www.ruby-forum.com/t/how-to-schedule-iq-recordings/234119)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 20, 2015, 10:42am UTC](https://www.ruby-forum.com/t/how-to-schedule-iq-recordings/234119 "2015-02-20T10:42:58Z")
Hello I have a need to record raw iq files of varing lengths of time and each iq file needs to have a unique file name. I am at the point now where i can record and iq file with a time stamp of the pc clock. That … --- ## [GPSDO and B2100](https://www.ruby-forum.com/t/gpsdo-and-b2100/234268)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 20, 2015, 9:35am UTC](https://www.ruby-forum.com/t/gpsdo-and-b2100/234268 "2015-02-20T09:35:08Z")
Hello, I recently installed a board mounted GPSDO (TCXO) on my B2100. Specifically I am using this in a USB powered mode and the web-site did say that the TCXO works off the USB power. I am using a passive antenna at… --- ## [Eye diagram error](https://www.ruby-forum.com/t/eye-diagram-error/234231)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [February 19, 2015, 9:56pm UTC](https://www.ruby-forum.com/t/eye-diagram-error/234231 "2015-02-19T21:56:43Z")
Hello, When I used eye diagram block (which seems to be a member of WxGUI class), the following error appeared: File “/usr/local/lib/python2.7/dist-packages/baz/eye.py”, line 98, in init self.st = gr.message\_sink(g… --- ## [X310 NI 2940R on Linux](https://www.ruby-forum.com/t/x310-ni-2940r-on-linux/234269)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 19, 2015, 9:36pm UTC](https://www.ruby-forum.com/t/x310-ni-2940r-on-linux/234269 "2015-02-19T21:36:59Z")
i have NI USRP 2940R i.e x310 connected to machine running Ubuntu 14.04 via SFP port 0.What are these warning about x300 is not defined also the tuned frequency is 000000MHz instead of have having a set target freque… --- ## [Gnuradio on OS X without X11](https://www.ruby-forum.com/t/gnuradio-on-os-x-without-x11/233612)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [February 19, 2015, 8:13pm UTC](https://www.ruby-forum.com/t/gnuradio-on-os-x-without-x11/233612 "2015-02-19T20:13:32Z")
Dear all, not sure if this is still interesting: I managed to install gnuradio without X11 on Mac OS X using these steps: {{ sudo port uninstall installed sudo port install py27-pygtk +quartz sudo port install gtk-… --- ## [QPSK Receiver and Processing Power](https://www.ruby-forum.com/t/qpsk-receiver-and-processing-power/234253)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 19, 2015, 5:19pm UTC](https://www.ruby-forum.com/t/qpsk-receiver-and-processing-power/234253 "2015-02-19T17:19:54Z")
Hello all, I am testing a QPSK Tx/Rx I made in grc across two USRP N210’s. I can demodulate and decode the data fine at the receiver to produce the bits I transmitted. The problem is, when watching the frequency sink… --- ## [OFDM\_Transmission\_reception](https://www.ruby-forum.com/t/ofdm-transmission-reception/234265)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 19, 2015, 3:19pm UTC](https://www.ruby-forum.com/t/ofdm-transmission-reception/234265 "2015-02-19T15:19:54Z")
Hello, I am beginner in gnuradio,My professor gave to me the attached code for an OFDM transmission between two USRP but I have not understood the role of generate block headers and Repack bit. Please what is the rol… --- ## [Automatically Restart UHD/gr-uhd blocks](https://www.ruby-forum.com/t/automatically-restart-uhd-gr-uhd-blocks/234250)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 19, 2015, 12:23am UTC](https://www.ruby-forum.com/t/automatically-restart-uhd-gr-uhd-blocks/234250 "2015-02-19T00:23:38Z")
I’ve recently received a request to have GNU Radio flowgraphs recover gracefully in the event of power glitches, or transient Ethernet anomalies that are severe enough to break the dataflow. ie. the event should be … --- ## [Start Flowgraph Signal Processing at Runtime](https://www.ruby-forum.com/t/start-flowgraph-signal-processing-at-runtime/234251)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 18, 2015, 7:18pm UTC](https://www.ruby-forum.com/t/start-flowgraph-signal-processing-at-runtime/234251 "2015-02-18T19:18:03Z")
Hi all, I want autostart=off in the options block so I can start a flowgraphs GUI environement, allow the users to configure settings and then start the flowgraph signal processing. For example, let the user choose w… --- ## [Calling usrp\_source block function from other block](https://www.ruby-forum.com/t/calling-usrp-source-block-function-from-other-block/234229)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 18, 2015, 5:33pm UTC](https://www.ruby-forum.com/t/calling-usrp-source-block-function-from-other-block/234229 "2015-02-18T17:33:22Z")
Hi all, I’m looking for the best way to retune the USRP from another block in a running flowgraph. I’ve seen the tune callback method used by bin\_statistics\_f, but I was wondering if there are other ways to do it. I … --- ## [Corgan Labs Expands Offering with Public and Advanced Courses](https://www.ruby-forum.com/t/corgan-labs-expands-offering-with-public-and-advanced-courses/234243)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 18, 2015, 4:46pm UTC](https://www.ruby-forum.com/t/corgan-labs-expands-offering-with-public-and-advanced-courses/234243 "2015-02-18T16:46:42Z")
View this email in your browser http://us10.campaign-archive1.com/?u=ef1aa9b809823d269b24031b7&id=4bd4a3853b&e= http://corganlabs.com Corgan Labs, a leading provider of SDR training and consulting solutions, and a pr… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/234237)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 18, 2015, 4:19pm UTC](https://www.ruby-forum.com/t/no-subject/234237 "2015-02-18T16:19:36Z")
sir,…I needed the py code of low pass filter. please any one mail me [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=33) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=35)