# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=33 [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:** 34 --- ## [Help required for dpsk\_loopback.grc](https://www.ruby-forum.com/t/help-required-for-dpsk-loopback-grc/234430)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 4, 2015, 5:42pm UTC](https://www.ruby-forum.com/t/help-required-for-dpsk-loopback-grc/234430 "2015-03-04T17:42:24Z")
Dear All, I am very new to GNU Radio and currently trying to explore the example grc blocks available with the package. For example, I tried to execute the example given in the example folder as “dpsk\_loopback.grc” … --- ## [Test\_corr\_and\_sync example](https://www.ruby-forum.com/t/test-corr-and-sync-example/234424)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 4, 2015, 5:23pm UTC](https://www.ruby-forum.com/t/test-corr-and-sync-example/234424 "2015-03-04T17:23:42Z")
Hi all, I’m trying to figure out what the test\_corr\_and\_sync example (located …/src/gnuradio/gr-digital/examples/demod/test\_corr\_and\_sync.grc) is showing me. I see the tags added by the correlator, but they seem to j… --- ## [Boost::serialization/archive -\> Attribute Error: 'module' object has no attribute '\'](https://www.ruby-forum.com/t/boost-serialization-archive-attribute-error-module-object-has-no-attribute-blockname/234433)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 4, 2015, 3:52pm UTC](https://www.ruby-forum.com/t/boost-serialization-archive-attribute-error-module-object-has-no-attribute-blockname/234433 "2015-03-04T15:52:15Z")
Hello all, I have some problems in getting my OOT module running with boost::serialization (have never used this part of boost before). The library is installed on a recent Kubuntu 14.10 with pybombs GNU radio. Once … --- ## [Low TX Power when performing frequency hopping](https://www.ruby-forum.com/t/low-tx-power-when-performing-frequency-hopping/234398)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 4, 2015, 12:21pm UTC](https://www.ruby-forum.com/t/low-tx-power-when-performing-frequency-hopping/234398 "2015-03-04T12:21:56Z")
Dear All, I am trying to implement some frequency hopping schemes in the ISM band with USRP N210 with RFX 2400 board ( I also tried the same with the SBX 40MHz board). I hop to the next channel (channel seperation : 5… --- ## [Mimo beam forming on USRP](https://www.ruby-forum.com/t/mimo-beam-forming-on-usrp/234419)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [March 4, 2015, 8:25am UTC](https://www.ruby-forum.com/t/mimo-beam-forming-on-usrp/234419 "2015-03-04T08:25:30Z")
Hi Guys, I am planning to build a mimo system which supports beam forming. Is USRP a good platform for my target? I do not want to use WARP because I need to operate at frequencies lower than 2.4GHz. A potential pro… --- ## [Re : Discuss-gnuradio Digest, Vol 124, Issue 9](https://www.ruby-forum.com/t/re-discuss-gnuradio-digest-vol-124-issue-9/227312)
**Author:** [@guelord\_ingala](https://www.ruby-forum.com/u/guelord_ingala)\ **Replies:** 1\ **Last updated:** [March 3, 2015, 12:18pm UTC](https://www.ruby-forum.com/t/re-discuss-gnuradio-digest-vol-124-issue-9/227312 "2015-03-03T12:18:11Z")
USRP2 IP new address Message-ID: removed\_email\_address@domain.invalid Content-Type: text/plain; charset=ISO-8859-1 On 03/08/2013 06:48 AM, guelord ingala wrote: Hi, Can you please assist me to change the usrp2 IP a… --- ## [Error in building](https://www.ruby-forum.com/t/error-in-building/234415)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 3, 2015, 11:39am UTC](https://www.ruby-forum.com/t/error-in-building/234415 "2015-03-03T11:39:16Z")
I am working to build an out-of-tree module in GNURADIO 3.7.3 on UBUNTU 14.10 OS. While building a module using command “cmake …/”, i am facing an error which is stated as follows: spitprojectlab-OptiPlex-3010:~/gr-ho… --- ## [SVD from LAPACK takes too long time](https://www.ruby-forum.com/t/svd-from-lapack-takes-too-long-time/234413)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 3, 2015, 10:20am UTC](https://www.ruby-forum.com/t/svd-from-lapack-takes-too-long-time/234413 "2015-03-03T10:20:23Z")
Dear all, I got trouble with Singular Value Decomposition computation in GNU Radio using LAPACK. I use SVD to build a precoder for a secondary transmitter in a cognitive radio model. It takes too long times to handle… --- ## [Stream tagging at iregular periods of time](https://www.ruby-forum.com/t/stream-tagging-at-iregular-periods-of-time/234399)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 2, 2015, 7:32pm UTC](https://www.ruby-forum.com/t/stream-tagging-at-iregular-periods-of-time/234399 "2015-03-02T19:32:18Z")
Hello, I am a little confused about stream tagging. I read in the documentation that one tag can be appended to any sample in the data stream so it can be something that happens once in a while and it doesn’t have to… --- ## [Questions regarding USRP N200 streaming](https://www.ruby-forum.com/t/questions-regarding-usrp-n200-streaming/232075)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 2, 2015, 6:19pm UTC](https://www.ruby-forum.com/t/questions-regarding-usrp-n200-streaming/232075 "2015-03-02T18:19:03Z")
Hi, I am working on a USRP project. I am using a USRP N200 with a BasicRX daughter board to perform data streaming. I am using GRC 3.6.4.1 on a Ubuntu 12.04 machine. The USRP N200 is set to have a decimation factor o… --- ## [Attribute Error: 'QByteArray' object has no attribute 'toByteArray'](https://www.ruby-forum.com/t/attribute-error-qbytearray-object-has-no-attribute-tobytearray/234403)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 2, 2015, 3:56pm UTC](https://www.ruby-forum.com/t/attribute-error-qbytearray-object-has-no-attribute-tobytearray/234403 "2015-03-02T15:56:03Z")
Hello: Working with the Dizzy build of E310 and trying to get GUI items to run that have no QWT in them to run. Starting with uhd\_fft.grc (gnuradio-companion run with LD\_PRELOADS documented previously) with all block… --- ## [M&M clock recovery for async digital signal](https://www.ruby-forum.com/t/m-m-clock-recovery-for-async-digital-signal/234356)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 2, 2015, 12:18pm UTC](https://www.ruby-forum.com/t/m-m-clock-recovery-for-async-digital-signal/234356 "2015-03-02T12:18:47Z")
Hi I’m trying to synchronize on the bits in an asynchronous digital signal using M&M clock recovery block. For instance, roughly 7 samples of +1. represent a “1” and roughly 7 samples of -1. represent a “0”. I’ve red… --- ## [Fwd: \[USRP-users\] USRP, GNURadio Companion, Polyphase Channelizer Issue](https://www.ruby-forum.com/t/fwd-usrp-users-usrp-gnuradio-companion-polyphase-channelizer-issue/234393)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 2, 2015, 12:20am UTC](https://www.ruby-forum.com/t/fwd-usrp-users-usrp-gnuradio-companion-polyphase-channelizer-issue/234393 "2015-03-02T00:20:49Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: Python errors running flowgraph - first attempt](https://www.ruby-forum.com/t/re-python-errors-running-flowgraph-first-attempt/234391)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 1, 2015, 9:06pm UTC](https://www.ruby-forum.com/t/re-python-errors-running-flowgraph-first-attempt/234391 "2015-03-01T21:06:25Z")
I don’t have a solution for this yet either, but I have made some “progress”. I decided to try and build PyQwt-5.2.0 and see what happened. Summarizing things we already found: The starting point for this effort was… --- ## [Re: Python errors running flowgraph - first attempt](https://www.ruby-forum.com/t/re-python-errors-running-flowgraph-first-attempt/234126)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 1, 2015, 4:15pm UTC](https://www.ruby-forum.com/t/re-python-errors-running-flowgraph-first-attempt/234126 "2015-03-01T16:15:03Z")
Hello: Just chiming in with the fact that I am struggling with this identical issue using a “Dizzy” build for an Ettus E310 running on the device. I have tried a number of different example flowgraphs that utilize QT … --- ## [Do you like Space, SDRs and RF System Design?](https://www.ruby-forum.com/t/do-you-like-space-sdrs-and-rf-system-design/234374)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 28, 2015, 1:22am UTC](https://www.ruby-forum.com/t/do-you-like-space-sdrs-and-rf-system-design/234374 "2015-02-28T01:22:47Z")
Greetings list, SpaceX is currently hiring for a number of open positions in the Avionics - RF group, including: RF & Comms Systems Engineering RF Design engineers (RF/hardware/digital) MAC Layer Engineers Antenna E… --- ## [Cmake can't find 'gnuradio-pmt'](https://www.ruby-forum.com/t/cmake-cant-find-gnuradio-pmt/234337)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [February 27, 2015, 3:00am UTC](https://www.ruby-forum.com/t/cmake-cant-find-gnuradio-pmt/234337 "2015-02-27T03:00:51Z")
Hello All: this is my first time on the list. I’m running gnuradio 3.7.6.1 with pybombs. I’m now trying to install OpenLTE which is dependent on Gnuradio and when it calls cmake to check for gnuradio’s packages it c… --- ## [Fwd: Re: GNU Radio on Zynq - trouble getting the user\_peripheral kernel module to work](https://www.ruby-forum.com/t/fwd-re-gnu-radio-on-zynq-trouble-getting-the-user-peripheral-kernel-module-to-work/234365)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 27, 2015, 12:27am UTC](https://www.ruby-forum.com/t/fwd-re-gnu-radio-on-zynq-trouble-getting-the-user-peripheral-kernel-module-to-work/234365 "2015-02-27T00:27:37Z")
Forgot to include the list. -------- Forwarded Message -------- Subject: Re: \[Discuss-gnuradio\] GNU Radio on Zynq - trouble getting the user\_peripheral kernel module to work Date: Thu, 26 Feb 2015 15:25:25 -0800 Fro… --- ## [Volk atan](https://www.ruby-forum.com/t/volk-atan/234360)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 26, 2015, 10:06pm UTC](https://www.ruby-forum.com/t/volk-atan/234360 "2015-02-26T22:06:55Z")
Hi everybody, I’m using “volk\_32fc\_s32f\_atan2\_32f\_a” to compute phase of signal. It’s important to know: what is the output phase interval of this function? Is it within \[-pi/2,pi/2\] as an standard atan function? Th… --- ## [Re: OP25 FSK4 Demodulator Error](https://www.ruby-forum.com/t/re-op25-fsk4-demodulator-error/234362)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 26, 2015, 8:41pm UTC](https://www.ruby-forum.com/t/re-op25-fsk4-demodulator-error/234362 "2015-02-26T20:41:25Z")
Hi, Before I start working on Op25 I want to know what kind of demodulator detector is op25 using? Correlation filters or frequency discriminator (quadrature demod) ? Which algos for symbol timing and frequency offset… --- ## [Wav File Source and Audio Sink](https://www.ruby-forum.com/t/wav-file-source-and-audio-sink/234364)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 26, 2015, 8:26pm UTC](https://www.ruby-forum.com/t/wav-file-source-and-audio-sink/234364 "2015-02-26T20:26:23Z")
Hi all, I am little bit puzzled by a simple flowgraph. I have prepared a wav file using following graph: Signal Source (float, sine, 1khz freq, sample rate 8000) -\> Throttle -\> Wav File Sink (sample rate 8000, 8 bit… --- ## [IRC, Stack Overflow](https://www.ruby-forum.com/t/irc-stack-overflow/234357)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 26, 2015, 12:13pm UTC](https://www.ruby-forum.com/t/irc-stack-overflow/234357 "2015-02-26T12:13:58Z")
Everyone, this is just a quick reminder for those subscribed to the mailing list that we are active in some other media as well. For quick discussions, but less permanent records, IRC can be useful. I’ve updated th… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/234353)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 26, 2015, 8:29am UTC](https://www.ruby-forum.com/t/no-subject/234353 "2015-02-26T08:29:48Z")
sir, what is the importance of the COSTOS loop in the QPSK mod/demod? This block is working fine for 4-qpsk, 8-qpsk. But it does not works for QAM modulation techniques. Is it needs to modify the cc code? if it is, w… --- ## [Want to contribute :-)](https://www.ruby-forum.com/t/want-to-contribute/234345)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 25, 2015, 6:33pm UTC](https://www.ruby-forum.com/t/want-to-contribute/234345 "2015-02-25T18:33:42Z")
Hello everyone, I am vilvanesh k,an undergraduate ,studying electronics and communication engineering in IIT BHU,Varanasi,India.I want to join the GNU Radio community and contribute to the same. Few http://same.few … --- ## [GNU Radio on Zynq - trouble getting the user\_peripheral kernel module to work](https://www.ruby-forum.com/t/gnu-radio-on-zynq-trouble-getting-the-user-peripheral-kernel-module-to-work/234220)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 13\ **Last updated:** [February 25, 2015, 1:01pm UTC](https://www.ruby-forum.com/t/gnu-radio-on-zynq-trouble-getting-the-user-peripheral-kernel-module-to-work/234220 "2015-02-25T13:01:25Z")
Hello lovely people, I’m trying to recreate the FIR filter example based on the Zynq GNU Radio wiki: http://gnuradio.org/redmine/projects/gnuradio/wiki/Zynq.http://gnuradio.org/redmine/projects/gnuradio/wiki/Zynq I’v… --- ## [Grcc from ssh session](https://www.ruby-forum.com/t/grcc-from-ssh-session/234275)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 25, 2015, 3:15am UTC](https://www.ruby-forum.com/t/grcc-from-ssh-session/234275 "2015-02-25T03:15:50Z")
Hi, I’m want to use grcc from an ssh session but I get the error importing the module Colors.py. I’ve seen this thread http://lists.gnu.org/archive/html/discuss-gnuradio/2013-06/msg00361.html about it. I’m using 3.… --- ## [Custom GRC block not accepting derived class objects](https://www.ruby-forum.com/t/custom-grc-block-not-accepting-derived-class-objects/234307)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 24, 2015, 11:20pm UTC](https://www.ruby-forum.com/t/custom-grc-block-not-accepting-derived-class-objects/234307 "2015-02-24T23:20:39Z")
I’m hoping for suggestions from the GRC and swig savvy folks on the list. I am trying to add LDPC functionality to gr-fec \[1\]. I made a GRC block for a decoder class. The decoder class constructor accepts a base class … --- ## [Difference between USRP RIO and Ettus USRP X310](https://www.ruby-forum.com/t/difference-between-usrp-rio-and-ettus-usrp-x310/234331)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 24, 2015, 7:30pm UTC](https://www.ruby-forum.com/t/difference-between-usrp-rio-and-ettus-usrp-x310/234331 "2015-02-24T19:30:39Z")
I am planning to test some of my physical layer algorithms on SDR. I compared these two USRPs , though Ettus is part of NI now and features of these devices are almost same, still there is huge variation almost doubl… --- ## [Pybombs](https://www.ruby-forum.com/t/pybombs/234277)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [February 24, 2015, 7:00pm UTC](https://www.ruby-forum.com/t/pybombs/234277 "2015-02-24T19:00:55Z")
Hello list Has anyone else has experienced any problems with pybombs: failing to load recipes This is happening when I try to install through ./app\_store.py I am getting this output I have tried several prefixes al… --- ## [New python block gr\_modtool - When no inputs/outputs, which parent should I use?](https://www.ruby-forum.com/t/new-python-block-gr-modtool-when-no-inputs-outputs-which-parent-should-i-use/234321)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 24, 2015, 4:42pm UTC](https://www.ruby-forum.com/t/new-python-block-gr-modtool-when-no-inputs-outputs-which-parent-should-i-use/234321 "2015-02-24T16:42:55Z")
Hello, I tried to implement a python block which generates tuning commands every 5 seconds. Python block: 0 inputs, 0 outputs, 1 out\_msg port which must be declared in the constructor. I used gr\_modtool. I got some… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=32) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=34)