# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=43 [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:** 44 --- ## [Running out of memory during BER simulations](https://www.ruby-forum.com/t/running-out-of-memory-during-ber-simulations/233226)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [November 26, 2014, 5:10pm UTC](https://www.ruby-forum.com/t/running-out-of-memory-during-ber-simulations/233226 "2014-11-26T17:10:34Z")
Hi list, I’m currently performing BER measurements for an IEEE 802.15.4 system. In order to do so, I have created a flowgraph (in GRC/python) that is executed for different SNR values until a certain number of bits … --- ## [FFT scaling consistency](https://www.ruby-forum.com/t/fft-scaling-consistency/233237)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [November 26, 2014, 12:38pm UTC](https://www.ruby-forum.com/t/fft-scaling-consistency/233237 "2014-11-26T12:38:51Z")
Hi, Yesterday someone in the chat raised an interesing issue. The absolute scale of the various FFT GUI sinks. If you take: \[signal source ampl=1.0\] -\> \[gui fft sink\] (use a source freq that fits exactly on 1 fft bi… --- ## [GNURadio retrictions](https://www.ruby-forum.com/t/gnuradio-retrictions/233198)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [November 26, 2014, 2:52am UTC](https://www.ruby-forum.com/t/gnuradio-retrictions/233198 "2014-11-26T02:52:21Z")
Hello GNURadioers! I’ve been working with GNURadio since about one year ago. I just figured out the following limitation of GNURadio’s framework that I want to diacuss them to clarify whether I’m wrong or not: 1- Fo… --- ## [QT GUI Time Sink text scale bug](https://www.ruby-forum.com/t/qt-gui-time-sink-text-scale-bug/233191)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [November 25, 2014, 9:50am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink-text-scale-bug/233191 "2014-11-25T09:50:28Z")
Can anyone confirm the QT GUI Time Sink has a time scale text bug when working at low sample rates in 3.7.6git-188-gf60cd24f? Please see below: https://dl.dropboxusercontent.com/u/49570443/qt\_time\_scale\_grc.png htt… --- ## [Re: linking Gnuradio and Gpredict?](https://www.ruby-forum.com/t/re-linking-gnuradio-and-gpredict/233204)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 24, 2014, 8:24pm UTC](https://www.ruby-forum.com/t/re-linking-gnuradio-and-gpredict/233204 "2014-11-24T20:24:32Z")
I know this is going back a bit but I would like to do the same thing for my Gnuradio satellite ground station. I was actually tempted to compile satellite tracking into a Gnuradio block. One you could simply use in a … --- ## [Patching airprobe to compile with GNURadio 3.7](https://www.ruby-forum.com/t/patching-airprobe-to-compile-with-gnuradio-3-7/233201)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 24, 2014, 7:03pm UTC](https://www.ruby-forum.com/t/patching-airprobe-to-compile-with-gnuradio-3-7/233201 "2014-11-24T19:03:47Z")
Hey, I’ve spent the last couple of days trying to get airprobe rtl GSM software to work with the new GNU Radio. I made a patch to grcompat to fill in the missing functions: And have got ported the gsm module for gsm-… --- ## [No Source in GRC after installing rtl-sdr and gr-osmosdr](https://www.ruby-forum.com/t/no-source-in-grc-after-installing-rtl-sdr-and-gr-osmosdr/233210)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 24, 2014, 4:39pm UTC](https://www.ruby-forum.com/t/no-source-in-grc-after-installing-rtl-sdr-and-gr-osmosdr/233210 "2014-11-24T16:39:18Z")
Hey, I just tried to setup Gnuradio (3.7.5) with my RTL2832U DVB-T dongle. First I installed Gnuradio via “sudo zypper install gnuradio”. Gnuradio-Companion starts and everything seems to work fine. Then I instal… --- ## [Working with TCP source/sink](https://www.ruby-forum.com/t/working-with-tcp-source-sink/233203)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 24, 2014, 4:21pm UTC](https://www.ruby-forum.com/t/working-with-tcp-source-sink/233203 "2014-11-24T16:21:16Z")
Hi I would like to work with transmission of signals with sound card of laptop. I would like to know the working of TCP sink/socket . I am attaching a transceiver system that i tried from a project published in the n… --- ## [Received Signal Power question](https://www.ruby-forum.com/t/received-signal-power-question/233208)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 24, 2014, 4:12pm UTC](https://www.ruby-forum.com/t/received-signal-power-question/233208 "2014-11-24T16:12:10Z")
I found one modified example from usrp\_spectrum\_sense.py which mentioned the power and noise calculation, could u plz help me figure out how it works? for i\_bin in range(bin\_start, bin\_stop): center\_freq… --- ## [Question about Plotting the Spectrum(Power against frequency) with usrp\_sense.py](https://www.ruby-forum.com/t/question-about-plotting-the-spectrum-power-against-frequency-with-usrp-sense-py/233176)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 24, 2014, 3:39pm UTC](https://www.ruby-forum.com/t/question-about-plotting-the-spectrum-power-against-frequency-with-usrp-sense-py/233176 "2014-11-24T15:39:25Z")
Question about the spectrum plot of the usr\_sense.py: I have modified the old usrp\_spectrum\_sense.py to fit the latest version of gnuradio, and now I can run the program and export the m.data into a txt file, I wonde… --- ## [Plateau detectors](https://www.ruby-forum.com/t/plateau-detectors/233186)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 24, 2014, 3:09pm UTC](https://www.ruby-forum.com/t/plateau-detectors/233186 "2014-11-24T15:09:44Z")
Hello all: I have read the code of “Schmidl & Cox synchronisation”.And I find the code use the plateau detectors.It shows that the code will output 1 at the middle of the plateau.Why not in the first place of the pl… --- ## [Re: Inconsistant Gain in X310](https://www.ruby-forum.com/t/re-inconsistant-gain-in-x310/233189)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 22, 2014, 11:55pm UTC](https://www.ruby-forum.com/t/re-inconsistant-gain-in-x310/233189 "2014-11-22T23:55:10Z")
Ben, I used set\_auto\_dc\_offset(0) and that make things work correctly with the X310+LFRX. I noticed in the osmocom source the DC offset mode can be set. So what I’ll do is run it in auto to get the initial correctio… --- ## [Saving to file with a timestamp](https://www.ruby-forum.com/t/saving-to-file-with-a-timestamp/233188)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 22, 2014, 7:54pm UTC](https://www.ruby-forum.com/t/saving-to-file-with-a-timestamp/233188 "2014-11-22T19:54:33Z")
I have a flowgraph working that I want to use to save data to a file. I would like the file name to update each time, ideally with a time stamp as part of the name. Is this possible directly from GRC of will I need to … --- ## [Problems with Gnuradio-Companion](https://www.ruby-forum.com/t/problems-with-gnuradio-companion/233187)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [November 22, 2014, 6:28pm UTC](https://www.ruby-forum.com/t/problems-with-gnuradio-companion/233187 "2014-11-22T18:28:02Z")
Hi everyone How does gnuradio-companion find and recognise blocks? Why is it so damned difficult for a normal person to write and maintain a block? I had developed a working block written which functioned fine, eve… --- ## [Sdr-iq on mac 10.7 or 10.9](https://www.ruby-forum.com/t/sdr-iq-on-mac-10-7-or-10-9/233179)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 21, 2014, 9:29pm UTC](https://www.ruby-forum.com/t/sdr-iq-on-mac-10-7-or-10-9/233179 "2014-11-21T21:29:04Z")
Greetings: My installation consists of: a) OSX 10.9 or 10.7 b) gnuradio 3.7.x installed through mac ports, c) osmosdr (because of its support for SDR-IQ within gnu radio companion) installed through mac ports. My goa… --- ## [TDD- Simulatneous transmission and reception of data in same frequency](https://www.ruby-forum.com/t/tdd-simulatneous-transmission-and-reception-of-data-in-same-frequency/233170)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 21, 2014, 9:54am UTC](https://www.ruby-forum.com/t/tdd-simulatneous-transmission-and-reception-of-data-in-same-frequency/233170 "2014-11-21T09:54:52Z")
Hello, Is there any implementation done with respect to TDD. Currently we would like to send data and receive in the same frequency. And it should switch after every transmission like i send TX1 data RX1 receives, and … --- ## [USRP in TDD mode](https://www.ruby-forum.com/t/usrp-in-tdd-mode/175953)
**Author:** [@casper\_the\_ghost](https://www.ruby-forum.com/u/casper_the_ghost)\ **Replies:** 5\ **Last updated:** [November 21, 2014, 9:25am UTC](https://www.ruby-forum.com/t/usrp-in-tdd-mode/175953 "2014-11-21T09:25:10Z")
Hello. I’m trying to build a two-way TDD system with two USRP1 boxes in pure C++ using libusrp and inband\_2rxhb\_2tx.rbf firmware. Now I have working system where one USRP1 box transmits data and other box receives. … --- ## [Dev Call November: Video Stream](https://www.ruby-forum.com/t/dev-call-november-video-stream/233163)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 20, 2014, 7:30pm UTC](https://www.ruby-forum.com/t/dev-call-november-video-stream/233163 "2014-11-20T19:30:31Z")
Dear fans, you can follow the monthly GR Dev Call live (or later) here: Cheers, M --- ## [USRP 1 overflow problem](https://www.ruby-forum.com/t/usrp-1-overflow-problem/233159)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 20, 2014, 4:41pm UTC](https://www.ruby-forum.com/t/usrp-1-overflow-problem/233159 "2014-11-20T16:41:14Z")
Hello All, I have just started learning SDR and new to USRP as well for GNU radio. SInce i am just a beginner, so i started with very basic examples benchmark\_tx.py and benchmark\_rx.py on USRP1. I am using daughter b… --- ## [Dev call tomorrow? + digital mod/demod questions](https://www.ruby-forum.com/t/dev-call-tomorrow-digital-mod-demod-questions/233154)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 20, 2014, 3:39pm UTC](https://www.ruby-forum.com/t/dev-call-tomorrow-digital-mod-demod-questions/233154 "2014-11-20T15:39:31Z")
It looks like there’s a dev call tomorrow. Is that 1700 or 1800 UTC? https://gnuradio.org/redmine/projects/gnuradio/wiki/Call20141120 As for input to the digital mod and packet structure discussion, I have a few quest… --- ## [GRC, Recording chunks of spectrum triggered on input signal level](https://www.ruby-forum.com/t/grc-recording-chunks-of-spectrum-triggered-on-input-signal-level/233036)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [November 19, 2014, 11:56pm UTC](https://www.ruby-forum.com/t/grc-recording-chunks-of-spectrum-triggered-on-input-signal-level/233036 "2014-11-19T23:56:55Z")
Hello, Being limited in my programming skills, I would very much like to do the following in Gnuradio Companion: Sample an input stream (from RTL-SDR) Generate a trigger signal based on the input stream If a trigger … --- ## [Bfsk](https://www.ruby-forum.com/t/bfsk/233099)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 19, 2014, 6:28pm UTC](https://www.ruby-forum.com/t/bfsk/233099 "2014-11-19T18:28:36Z")
Would someone please recommend a book that steps through the implementation used in GNU Radio for the Frequency Mod and Quadrature Mod blocks? I’ve looked at the source code and I have seen posts trying to explain wha… --- ## [OFDM and FEC](https://www.ruby-forum.com/t/ofdm-and-fec/233021)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 19, 2014, 4:10pm UTC](https://www.ruby-forum.com/t/ofdm-and-fec/233021 "2014-11-19T16:10:10Z")
Hi Folks, I am attempting to get some FEC working with my GRC OFDM Transmitter and Receiver, which I created by modifying the example versions. You can see the flowgraphs at: http://hal.g7iii.net/GRC/OFDM/ofdm\_rx\_fcd… --- ## [EnOcean?](https://www.ruby-forum.com/t/enocean/233134)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 19, 2014, 11:42am UTC](https://www.ruby-forum.com/t/enocean/233134 "2014-11-19T11:42:40Z")
Hi, are there already projects out in the wild to use EnOcean ISO/IEC 14543-3-10 protocol with gnuradio? Ralph. --- ## [RuntimeError: b200: 2 RX 1 TX and 1 RX 2 TX configurations not possible](https://www.ruby-forum.com/t/runtimeerror-b200-2-rx-1-tx-and-1-rx-2-tx-configurations-not-possible/233068)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [November 18, 2014, 11:30pm UTC](https://www.ruby-forum.com/t/runtimeerror-b200-2-rx-1-tx-and-1-rx-2-tx-configurations-not-possible/233068 "2014-11-18T23:30:02Z")
Hello, I have a B210 and I am trying to transmit and receive from all it’s channels simultaneously. My setup is a macmini late 2012 with Ubuntu 12.04 install. I compiled and installed gnuradio from source using the … --- ## [Bfsk](https://www.ruby-forum.com/t/bfsk/233123)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 18, 2014, 8:07pm UTC](https://www.ruby-forum.com/t/bfsk/233123 "2014-11-18T20:07:29Z")
There isn’t muchin this. Here is a brief explanation. Consider a signal f(t) which represents an instantaneous frequency of a sinusoid and which carries some information. Then you can generate the signal phi(t) = … --- ## [Libserial c++ with gnuradio](https://www.ruby-forum.com/t/libserial-c-with-gnuradio/233082)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [November 18, 2014, 6:10pm UTC](https://www.ruby-forum.com/t/libserial-c-with-gnuradio/233082 "2014-11-18T18:10:08Z")
Hi, I installed libserial to access serial port by C++ from gnu radio, I included #include \ #include to lib/XXXX.cc file, I can compile successfully, but when I run top\_block.py file I get the fol… --- ## [Packet Header Generator](https://www.ruby-forum.com/t/packet-header-generator/233065)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 18, 2014, 5:15pm UTC](https://www.ruby-forum.com/t/packet-header-generator/233065 "2014-11-18T17:15:02Z")
I’m trying to use the Packet Header Generator block (not the Default one) from within GRC to generate a packet header formatted to my own specification in order to match an existing protocol. I assume that an appropr… --- ## [Help needed with hacking through SWIG / Python / custom block](https://www.ruby-forum.com/t/help-needed-with-hacking-through-swig-python-custom-block/233115)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 18, 2014, 3:56pm UTC](https://www.ruby-forum.com/t/help-needed-with-hacking-through-swig-python-custom-block/233115 "2014-11-18T15:56:24Z")
Hi all, I’m trying a sort of a ‘hack’, but it doesn’t work so far. What I want to do is to add a method to the class in my custom block, and make this method available in Python (the top\_block.py). Without knowledge o… --- ## [Gr-tnc ImportError](https://www.ruby-forum.com/t/gr-tnc-importerror/233109)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 18, 2014, 12:57pm UTC](https://www.ruby-forum.com/t/gr-tnc-importerror/233109 "2014-11-18T12:57:15Z")
Have you ever used the gr-tnc library? (https://github.com/jmalsbury/gr-tnc)I try to run the examples that are in there and I get the following error: ImportError: libgnuradio-tnc.so cannot open shared object file [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=42) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=44)