# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=29 [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:** 30 --- ## [QT GUI time sink (float) unnecessary memmove()?](https://www.ruby-forum.com/t/qt-gui-time-sink-float-unnecessary-memmove/234770)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [March 31, 2015, 12:15am UTC](https://www.ruby-forum.com/t/qt-gui-time-sink-float-unnecessary-memmove/234770 "2015-03-31T00:15:24Z")
Hi, Can this memmove() be safely skipped if ((d\_start == 0) || (gr::high\_res\_timer\_now() - d\_last\_time \> d\_update\_time))? I think it can, but I am not sure. With some high throughput, high sample rate flowgraphs, … --- ## [Programming issue](https://www.ruby-forum.com/t/programming-issue/241332)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 30, 2015, 5:16pm UTC](https://www.ruby-forum.com/t/programming-issue/241332 "2015-03-30T17:16:11Z")
Hi… I trying to build the costas loop for 16QPSK. But there are some errors are there. I’m not getting the error message. the message is like: 2: Test command: /bin/sh “/home/lekha/gr-project/build/python/qa\_cost\_te… --- ## [QT GUI Update Rates for Vector vs Number Sink](https://www.ruby-forum.com/t/qt-gui-update-rates-for-vector-vs-number-sink/241331)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 30, 2015, 2:41pm UTC](https://www.ruby-forum.com/t/qt-gui-update-rates-for-vector-vs-number-sink/241331 "2015-03-30T14:41:13Z")
My GRC flowgraph has a block that outputs a float and a vector of floats, at a rate of approx 1.49 updates per second. These go to a QT GUI Vector Sink and a QT GUI Number Sink. The number sink has a graph type of “No… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/241329)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 30, 2015, 10:01am UTC](https://www.ruby-forum.com/t/no-subject/241329 "2015-03-30T10:01:57Z")
Hi, I’m trying to use the costas loop to get an timing estimate for 16QPSK. What will be the value of error proportional constant K? How to choose the K value? thanks for your replay --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/241328)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [March 30, 2015, 9:40am UTC](https://www.ruby-forum.com/t/no-subject/241328 "2015-03-30T09:40:50Z")
HI, I’m trying to build the costas loop block…but it showing the error like this while I execute the make command: /home/lekha/gr-digital/lib/cost\_impl.cc: In constructor ‘gr::digital::cost\_impl::cost\_impl(float, in… --- ## [Achievable Sampling Rate without Under/Overflows](https://www.ruby-forum.com/t/achievable-sampling-rate-without-under-overflows/234760)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 30, 2015, 5:12am UTC](https://www.ruby-forum.com/t/achievable-sampling-rate-without-under-overflows/234760 "2015-03-30T05:12:38Z")
I need some understanding of what reasonably achievable sample rates are using GNU Radio to implement a packet base radio. For example, I’m running into D’s at only 430 k/samples. This is running a packet detecting r… --- ## [3.7.7 and ControlPort](https://www.ruby-forum.com/t/3-7-7-and-controlport/241320)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [March 29, 2015, 11:02pm UTC](https://www.ruby-forum.com/t/3-7-7-and-controlport/241320 "2015-03-29T23:02:23Z")
Hi, Anyone knows if well get controlport back in 3.7.7? Thanks, Murray --- ## [R820T frequency tuning issue](https://www.ruby-forum.com/t/r820t-frequency-tuning-issue/234369)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [March 29, 2015, 10:52am UTC](https://www.ruby-forum.com/t/r820t-frequency-tuning-issue/234369 "2015-03-29T10:52:59Z")
As briefly mentioned on the #gnuradio IRC mailing list, I am facing an issue with tuning a R820T DVB-T dongle at the GPS carrier frequency. I had qualified the various dongles at 1.5 GHz, and had not considered that … --- ## [Switching flow between two paths](https://www.ruby-forum.com/t/switching-flow-between-two-paths/234733)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [March 28, 2015, 3:57pm UTC](https://www.ruby-forum.com/t/switching-flow-between-two-paths/234733 "2015-03-28T15:57:27Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Specifying build dependencies of other OOT modules in my OOT module](https://www.ruby-forum.com/t/specifying-build-dependencies-of-other-oot-modules-in-my-oot-module/234758)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 27, 2015, 4:06pm UTC](https://www.ruby-forum.com/t/specifying-build-dependencies-of-other-oot-modules-in-my-oot-module/234758 "2015-03-27T16:06:10Z")
I am writing my own module. In the module, I am using gr-dvbt (GitHub - BogdanDIA/gr-dvbt: DVB-T implementation in gnuradio) to perform Reed-Solomon en/decoding. In this situation, how to tell ‘I am using gr-dvbt’ to… --- ## [GPS Signal Simulation using GNURadio and USRP](https://www.ruby-forum.com/t/gps-signal-simulation-using-gnuradio-and-usrp/234754)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 27, 2015, 6:03am UTC](https://www.ruby-forum.com/t/gps-signal-simulation-using-gnuradio-and-usrp/234754 "2015-03-27T06:03:17Z")
Hello, I am new to GNURadio and is very much interested now. I am planning to develop a GPS Signal Simulator using GNURadio and USRP. Can anyone please guide me to accomplish this? Thanks, Joms --- ## [Definition of "radians per sample"](https://www.ruby-forum.com/t/definition-of-radians-per-sample/234737)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 27, 2015, 2:59am UTC](https://www.ruby-forum.com/t/definition-of-radians-per-sample/234737 "2015-03-27T02:59:05Z")
Hello, the documentation for the PLL blocks in GNURadio says: “All settings max\_freq and min\_freq are in terms of radians per sample, NOT HERTZ.” Therefore I thought that to specify a bandwidth bw it would have to co… --- ## [ESA Summer of Code in Space proposal](https://www.ruby-forum.com/t/esa-summer-of-code-in-space-proposal/234753)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 26, 2015, 8:33pm UTC](https://www.ruby-forum.com/t/esa-summer-of-code-in-space-proposal/234753 "2015-03-26T20:33:37Z")
\-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello GNU Radio’ers, You’re probably all well aware that SOCIS is coming up. Although application deadline is April 30 \[1\], I want to publish my SOCIS proposal today. Yo… --- ## [GNU Radio Cross Reference Tool](https://www.ruby-forum.com/t/gnu-radio-cross-reference-tool/234750)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 26, 2015, 7:28pm UTC](https://www.ruby-forum.com/t/gnu-radio-cross-reference-tool/234750 "2015-03-26T19:28:18Z")
Hi everyone, This is a very nice online tool that was recently introduced to me. I think it’s valuable enough that it should be shared to everyone. http://code.metager.de/source/xref/gnu/gnuradio/ It lets you search… --- ## [OFDM TX/RX with large packet\_len size](https://www.ruby-forum.com/t/ofdm-tx-rx-with-large-packet-len-size/234747)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 26, 2015, 4:52pm UTC](https://www.ruby-forum.com/t/ofdm-tx-rx-with-large-packet-len-size/234747 "2015-03-26T16:52:21Z")
Hi, I’ve problem to use a large packet\_len size (ie; 1500 bytes) in OFDM Flowgraph as in the digital folder examples. I got this error: sched: \ is requesting more input data than we c… --- ## [Pybombs, gnuradio, libprotobuf issues PLEASE HELP ME](https://www.ruby-forum.com/t/pybombs-gnuradio-libprotobuf-issues-please-help-me/234707)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 12\ **Last updated:** [March 26, 2015, 4:02pm UTC](https://www.ruby-forum.com/t/pybombs-gnuradio-libprotobuf-issues-please-help-me/234707 "2015-03-26T16:02:57Z")
I’ve picked up some issues over the last month of trying to get a working gnuradio pybombs install with the openlte and fosphor pybombs packages. Had no idea it would be this difficult on a brand new system with a fr… --- ## [Spikes in b210 received data](https://www.ruby-forum.com/t/spikes-in-b210-received-data/234683)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 26, 2015, 11:58am UTC](https://www.ruby-forum.com/t/spikes-in-b210-received-data/234683 "2015-03-26T11:58:17Z")
Hi all I am trying to capture a cosine at 300KHz sent from a vector signal generator(VSG) using USRP B210. VSG is connected to USRP using SMA cable. signal level at the input of B210 is -30dBm. For this, I have made… --- ## [Audio Sink Producing UaUaUaUa](https://www.ruby-forum.com/t/audio-sink-producing-uauauaua/234741)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 25, 2015, 7:23pm UTC](https://www.ruby-forum.com/t/audio-sink-producing-uauauaua/234741 "2015-03-25T19:23:02Z")
Hello, When I have an audio sink in my flowgraph, leaving the device field blank to default to speakers, I see a continuous stream of UaUaUaUa printed to the console. What is this telling me? Disabling the audio sink… --- ## [A few questions regarding QT GUI development](https://www.ruby-forum.com/t/a-few-questions-regarding-qt-gui-development/234720)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 25, 2015, 4:57pm UTC](https://www.ruby-forum.com/t/a-few-questions-regarding-qt-gui-development/234720 "2015-03-25T16:57:36Z")
Greetings all, I recently began using gnuradio and GRC with a pair of USRPs. It’s my understanding that plans are underway to ultimately remove WX in v3.9 as a GUI option from gnuradio, and replace it with QT. It… --- ## [Basic Microphone Integration](https://www.ruby-forum.com/t/basic-microphone-integration/234728)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 25, 2015, 4:52pm UTC](https://www.ruby-forum.com/t/basic-microphone-integration/234728 "2015-03-25T16:52:22Z")
Hi all, I’ve got my packet based radio working now, so I want to test it by talking into a mic on the transmitter laptop and playing the stream on the speakers of the receiver laptop. I realized I don’t know how to… --- ## [Looking for old BBN 802.11 codes](https://www.ruby-forum.com/t/looking-for-old-bbn-802-11-codes/234730)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 25, 2015, 4:51am UTC](https://www.ruby-forum.com/t/looking-for-old-bbn-802-11-codes/234730 "2015-03-25T04:51:28Z")
I’m looking for old BBN 802.11 codes. But, links in gnuradio.org ( http://gnuradio.org/redmine/projects/gnuradio/wiki/BBN\_Technologies\_Internetwork\_Research\_ADROIT\_Project) may not seem to work. Does anyone know wher… --- ## [Fwd: Write a source block in python](https://www.ruby-forum.com/t/fwd-write-a-source-block-in-python/233928)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 25, 2015, 1:04am UTC](https://www.ruby-forum.com/t/fwd-write-a-source-block-in-python/233928 "2015-03-25T01:04:20Z")
Hi I wrote a simple source block that reads a string (as a parameter) and outputs the corresponding array of bytes. Here is the code: class myblock(gr.sync\_block): def \_\_init\_\_(self, helloMsg): gr.sync\_block.\_\_i… --- ## [SOCIS: Accepting Proposals](https://www.ruby-forum.com/t/socis-accepting-proposals/234404)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 25, 2015, 12:43am UTC](https://www.ruby-forum.com/t/socis-accepting-proposals/234404 "2015-03-25T00:43:05Z")
Hi Everyone, GSoC is still in the doings, but we have been accepted for ESA’s summer of code (SOCIS). We will post more information soon, but for now, head to the SOCIS website for general info and eligibility: http… --- ## [PLL blocks parameters units](https://www.ruby-forum.com/t/pll-blocks-parameters-units/234727)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 24, 2015, 10:24pm UTC](https://www.ruby-forum.com/t/pll-blocks-parameters-units/234727 "2015-03-24T22:24:42Z")
Hello, the documentation for the PLL blocks in GNURadio says: “All settings max\_freq and min\_freq are in terms of radians per sample, NOT HERTZ.” Therefore I thought that to specify a bandwidth bw it would have to co… --- ## [Passing USRP source block shared pointer through SWIG](https://www.ruby-forum.com/t/passing-usrp-source-block-shared-pointer-through-swig/234705)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 24, 2015, 9:25pm UTC](https://www.ruby-forum.com/t/passing-usrp-source-block-shared-pointer-through-swig/234705 "2015-03-24T21:25:08Z")
Hi all, I’m looking into the possibility of passing the \ object from Python into a C++ out of tree module. In my module, I have: controller\_cc\_impl::controller\_cc\_impl(gr::uhd::usrp\_s… --- ## [A few questions regarding QT GUI development](https://www.ruby-forum.com/t/a-few-questions-regarding-qt-gui-development/234721)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [March 24, 2015, 7:40pm UTC](https://www.ruby-forum.com/t/a-few-questions-regarding-qt-gui-development/234721 "2015-03-24T19:40:06Z")
Greetings all, I recently began using gnuradio and GRC with a pair of USRPs. It’s my understanding that plans are underway to ultimately remove WX in v3.9 as a GUI option from gnuradio, and replace it with QT. It… --- ## [Feature Request](https://www.ruby-forum.com/t/feature-request/234704)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 24, 2015, 6:02pm UTC](https://www.ruby-forum.com/t/feature-request/234704 "2015-03-24T18:02:30Z")
Hi all, I wanted to pass a long two features that I wished existed. I think it would be nice if every block in GRC came with a comment field. A field for text that does nothing but allow users to add notes to help o… --- ## [\-------'Range' network is not detected-------](https://www.ruby-forum.com/t/range-network-is-not-detected/234712)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 24, 2015, 5:10pm UTC](https://www.ruby-forum.com/t/range-network-is-not-detected/234712 "2015-03-24T17:10:44Z")
Hi all, I have recently installed OpenBTS-2.8 on a Banana-Pi (Processor: ARMv7) board for USRP N210 functioning. All the prerequisites including GNURadio, UHD were successfully built on the board prior to OpenBTS ins… --- ## [File Sink Unbuffered](https://www.ruby-forum.com/t/file-sink-unbuffered/234708)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 24, 2015, 2:30am UTC](https://www.ruby-forum.com/t/file-sink-unbuffered/234708 "2015-03-24T02:30:04Z")
I noticed a large difference in errors between input and output files when I turn unbuffered on and off. With unbuffered on, there was no difference between my input and output file. With unbuffered off, there were … --- ## [FOSDEM Presentations](https://www.ruby-forum.com/t/fosdem-presentations/234702)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 23, 2015, 5:10pm UTC](https://www.ruby-forum.com/t/fosdem-presentations/234702 "2015-03-23T17:10:42Z")
All of the FOSDEM SDR talks are now online, I’ve updated the presentations page: http://gnuradio.org/redmine/projects/gnuradio/wiki/Presentations M [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=28) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=30)