# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=36 [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:** 37 --- ## [Simple Frame Detection](https://www.ruby-forum.com/t/simple-frame-detection/234114)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [February 9, 2015, 4:34pm UTC](https://www.ruby-forum.com/t/simple-frame-detection/234114 "2015-02-09T16:34:31Z")
Hello, I have been searching for a simple frame detection scheme for GNURadio for a while, but everything I’ve found either doesn’t work or it is more complicated than I expected. What I needed was a block that would… --- ## [\[coproc\] WG Call](https://www.ruby-forum.com/t/coproc-wg-call/234135)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 9, 2015, 3:57pm UTC](https://www.ruby-forum.com/t/coproc-wg-call/234135 "2015-02-09T15:57:11Z")
I didn’t get a whole ton of responses on scheduling the time, so apologies on taking so long with this. The next Coprocessors WG call will be Wednesday, Feb 11, 2015 at 2pm Eastern/1900 UTC. Doug --- ## [Sched is requesting more input data than we can provide](https://www.ruby-forum.com/t/sched-is-requesting-more-input-data-than-we-can-provide/238693)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 11\ **Last updated:** [February 9, 2015, 3:16pm UTC](https://www.ruby-forum.com/t/sched-is-requesting-more-input-data-than-we-can-provide/238693 "2015-02-09T15:16:53Z")
Hi! I am getting this error: sched: is requesting more input data than we can provide. ninput\_items\_required = 16000 max\_possible\_items\_available = 8191 and I have no idea how to fix it. Is it possible to request … --- ## [Can't find PyQt4.Qwt5](https://www.ruby-forum.com/t/cant-find-pyqt4-qwt5/234133)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 9, 2015, 2:57pm UTC](https://www.ruby-forum.com/t/cant-find-pyqt4-qwt5/234133 "2015-02-09T14:57:29Z")
I’m making much more progress on my embedded x86\_64 gnuradio project. I am now able to build and run my grc-created python app, but I get this error. I’m using some counter/sliders from Qwt (Qt GUI Range block) to be… --- ## [Polyphase Filer examples and Busport Implementation for QT GUI Frequency Sink](https://www.ruby-forum.com/t/polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234128)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 9, 2015, 2:32pm UTC](https://www.ruby-forum.com/t/polyphase-filer-examples-and-busport-implementation-for-qt-gui-frequency-sink/234128 "2015-02-09T14:32:22Z")
Hello: In trying to execute the flowgraphs found in the blog post on the subject at: I find that the Busport connections in flowgraphs such as fm\_reconstruction.grc and others are broken when they connect to the Q… --- ## [Simplest message passing possible](https://www.ruby-forum.com/t/simplest-message-passing-possible/234120)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 8, 2015, 2:49am UTC](https://www.ruby-forum.com/t/simplest-message-passing-possible/234120 "2015-02-08T02:49:17Z")
Earlier today, I’ve posted a question on how to do frame detection and extraction in GNU Radio (http://gnuradio.4.n7.nabble.com/Simple-Frame-Detection-td52233.html). I have a feeling that the best way to accomplish wh… --- ## [Help with GRC and 3.7](https://www.ruby-forum.com/t/help-with-grc-and-3-7/234008)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 7, 2015, 2:50pm UTC](https://www.ruby-forum.com/t/help-with-grc-and-3-7/234008 "2015-02-07T14:50:23Z")
I have a GRC flowgraph that was given to me about three years ago and installed gnuradio 3.7 from add-apt-repository ppa:gqrx/releases but It is missing several blocks, I tried to piece the puzzle back with the missin… --- ## [HELP: USRP1+WBXv3 "Overflow"](https://www.ruby-forum.com/t/help-usrp1-wbxv3-overflow/233464)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 14\ **Last updated:** [February 7, 2015, 1:37pm UTC](https://www.ruby-forum.com/t/help-usrp1-wbxv3-overflow/233464 "2015-02-07T13:37:22Z")
Good day, We are beginners using the USRP1 with WBX v.3 50-2200 daughterboard and GNU radio Companion version 3.7.5.1 with UHD\_003.008.000-18-g864f84b5 installed on Ubuntu 14.04 LTS operating system. Our goal in using… --- ## [Simple Frame Detection](https://www.ruby-forum.com/t/simple-frame-detection/234111)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 7, 2015, 2:25am UTC](https://www.ruby-forum.com/t/simple-frame-detection/234111 "2015-02-07T02:25:31Z")
I have been searching for a simple frame detection scheme for GNURadio for a while, but everything I’ve found either doesn’t work or it is more complicated than I expected. What I needed was a block that would be sear… --- ## [Where I can search for sample files](https://www.ruby-forum.com/t/where-i-can-search-for-sample-files/234112)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 6, 2015, 8:07pm UTC](https://www.ruby-forum.com/t/where-i-can-search-for-sample-files/234112 "2015-02-06T20:07:13Z")
Hello,I’ve only a TV tuner E4000 for have fun with gnuradio…unlucky its sample rate is less than 3MSPS…I want to have fun with application more compute intensive, in order to see better bottlenecks and latencies…Could… --- ## [Python errors running flowgraph - first attempt](https://www.ruby-forum.com/t/python-errors-running-flowgraph-first-attempt/234099)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 6, 2015, 12:04pm UTC](https://www.ruby-forum.com/t/python-errors-running-flowgraph-first-attempt/234099 "2015-02-06T12:04:40Z")
Newbie to gnuradio. After struggling for a couple weeks with build issues, I finally have a yocto-based build for an embedded x86\_64 target. I’m trying to execute a flowgraph that I demonstrated successfully on Ubun… --- ## [Multiple SDR Devices on the same computer](https://www.ruby-forum.com/t/multiple-sdr-devices-on-the-same-computer/234104)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 6, 2015, 9:25am UTC](https://www.ruby-forum.com/t/multiple-sdr-devices-on-the-same-computer/234104 "2015-02-06T09:25:28Z")
Dear all, I’m using BladeRF hardware in my system. I want to use two devices on the same computer. The “osmocom Source” lets me choose several channels, I actually need to use 2 channels. However, I don’t know how to… --- ## [FOSDEM attendee? Re: 802.15.4 CSS PHY](https://www.ruby-forum.com/t/fosdem-attendee-re-802-15-4-css-phy/234040)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 5, 2015, 3:38pm UTC](https://www.ruby-forum.com/t/fosdem-attendee-re-802-15-4-css-phy/234040 "2015-02-05T15:38:30Z")
Hi list, this is just a shot in the dark, but I forgot to get the name of an attendee during the Internet of #allthethings talk. If you are, or know who is, the person who said he had implemented an 802.15.4 CSS PHY … --- ## [Flush samples of blocks when changing centrer frequency](https://www.ruby-forum.com/t/flush-samples-of-blocks-when-changing-centrer-frequency/234095)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [February 5, 2015, 12:14pm UTC](https://www.ruby-forum.com/t/flush-samples-of-blocks-when-changing-centrer-frequency/234095 "2015-02-05T12:14:34Z")
Hi, I have a python flowgraph with several blocks. One of them is a “filter.single\_pole\_iir\_filter\_ff” which does a moving average. The last block is a Sink to file block. I scan several bands, 10MHz each, in order t… --- ## [GNU Radio Companion doesn't show the QT GUI Sink](https://www.ruby-forum.com/t/gnu-radio-companion-doesnt-show-the-qt-gui-sink/233945)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 5, 2015, 6:55am UTC](https://www.ruby-forum.com/t/gnu-radio-companion-doesnt-show-the-qt-gui-sink/233945 "2015-02-05T06:55:43Z")
Hi, I am new to GNU Radio, so I built a FM receiver to get started on the journey. I created the following .grc file, and when I clicked \<\>, I saw the GUI window pop up and exit immediately. The sound came out only f… --- ## [\[White Space Database Project\] Postdoc research vacancy available at TU Delft](https://www.ruby-forum.com/t/white-space-database-project-postdoc-research-vacancy-available-at-tu-delft/234085)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 4, 2015, 8:42pm UTC](https://www.ruby-forum.com/t/white-space-database-project-postdoc-research-vacancy-available-at-tu-delft/234085 "2015-02-04T20:42:32Z")
Dear GNU Radio community, Apologies for spamming the list \[with permission from Tom - thanks!\] - I just feel this is one of the best places to propagate this information. My research group@TU Delft is searching for a… --- ## [UHD Error: recv packet demuxer unexpected sid](https://www.ruby-forum.com/t/uhd-error-recv-packet-demuxer-unexpected-sid/234011)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [February 4, 2015, 4:33pm UTC](https://www.ruby-forum.com/t/uhd-error-recv-packet-demuxer-unexpected-sid/234011 "2015-02-04T16:33:15Z")
Sometimes I run my python program I continuously get this error: … UHD Error: recv packet demuxer unexpected sid 0x3fff9 UHD Error: recv packet demuxer unexpected sid 0x4fff9 UHD Error: recv packet demuxer unexpec… --- ## [How to use CtrlPort and gr-perf-monitorx](https://www.ruby-forum.com/t/how-to-use-ctrlport-and-gr-perf-monitorx/234060)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 3, 2015, 11:10am UTC](https://www.ruby-forum.com/t/how-to-use-ctrlport-and-gr-perf-monitorx/234060 "2015-02-03T11:10:43Z")
Hello All Gnu Radio users, After following some presentations of GNU Radio in FOSDEM, I decide to take GNU Radio platform again and do some implementations. My question is how can i use CtrlPort and gr-perf-monitorx … --- ## [OOT Python Block](https://www.ruby-forum.com/t/oot-python-block/234059)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 3, 2015, 10:30am UTC](https://www.ruby-forum.com/t/oot-python-block/234059 "2015-02-03T10:30:20Z")
Hi Tom and Richard, I am sorry, but I cannot reproduce the error, which I described before. I created a new module with gr\_modtool and added a sync python block and all worked fine. The problem might have vanished wi… --- ## [Block properties XML help](https://www.ruby-forum.com/t/block-properties-xml-help/234055)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 3, 2015, 9:55am UTC](https://www.ruby-forum.com/t/block-properties-xml-help/234055 "2015-02-03T09:55:40Z")
I’m looking for some guidance with block properties XML. I have a situation where I’d like to have subsets of options based on some other option setting. For example, in gr-dvbt2, I have an option setting for the vers… --- ## [CMake/ninja error?](https://www.ruby-forum.com/t/cmake-ninja-error/234049)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 2, 2015, 7:45pm UTC](https://www.ruby-forum.com/t/cmake-ninja-error/234049 "2015-02-02T19:45:59Z")
I’m having trouble with Cmake and the produced ninja “make-files” All seems to go well with “Cmake -GNinja”, but the commands to produce a .res file is wrong. It includes a “/MP” E.g. if I do a ‘ninja.exe gnuradio-run… --- ## [Issue with Results from GR-CDMA](https://www.ruby-forum.com/t/issue-with-results-from-gr-cdma/234048)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [February 2, 2015, 7:29pm UTC](https://www.ruby-forum.com/t/issue-with-results-from-gr-cdma/234048 "2015-02-02T19:29:53Z")
Frank, see some comments inline. Achilleas Hello sorry for the last message thought i attached my screenshot results at first. I am having some problems as to whether the information from the cdma transmission and… --- ## [Phase shift block](https://www.ruby-forum.com/t/phase-shift-block/234046)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 2, 2015, 5:37pm UTC](https://www.ruby-forum.com/t/phase-shift-block/234046 "2015-02-02T17:37:10Z")
Hi, Application Note “Synchronization and MIMO Capability with USRP Devices” from Ettus includes a “phase\_shift” block in Figure 5. Whatever happend to that block? Can’t find it, did it get replaced? Regards Johanne… --- ## [Ofdm\_chanest\_vcvc\_impl.cc](https://www.ruby-forum.com/t/ofdm-chanest-vcvc-impl-cc/233948)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [February 2, 2015, 3:03pm UTC](https://www.ruby-forum.com/t/ofdm-chanest-vcvc-impl-cc/233948 "2015-02-02T15:03:35Z")
Hi all: Thank you in advance.I have read the source code:ofdm\_chanest\_vcvc\_impl.cc.But i have a question. void ofdm\_chanest\_vcvc\_impl::get\_chan\_taps( const gr\_complex \*sync\_sym1, const gr\_complex \*sync\_sym2, int carr\_… --- ## [GUI window position](https://www.ruby-forum.com/t/gui-window-position/234018)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 2, 2015, 1:16pm UTC](https://www.ruby-forum.com/t/gui-window-position/234018 "2015-02-02T13:16:29Z")
Is there any way to set the position of a gui window? Not the position of elements inside the winow, but that actual window itself. For my need I am running multiple flow graphs with TCP sources, so nothing pops up u… --- ## [GNU Radio Companion QT GUI Window Quit Immediately](https://www.ruby-forum.com/t/gnu-radio-companion-qt-gui-window-quit-immediately/233946)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [February 1, 2015, 3:27pm UTC](https://www.ruby-forum.com/t/gnu-radio-companion-qt-gui-window-quit-immediately/233946 "2015-02-01T15:27:53Z")
Hi, I am new to GNU Radio, so I built a FM receiver to get started on the journey. I created the following .grc file, and when I clicked \<\>, I saw the QT GUI window pop up and exit immediately. The sound came out on… --- ## [OOT Python Block](https://www.ruby-forum.com/t/oot-python-block/234004)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [January 31, 2015, 5:28pm UTC](https://www.ruby-forum.com/t/oot-python-block/234004 "2015-01-31T17:28:18Z")
I’ve created a python block that I’ve tested via command line. It passes all qa tests. I’ve also created an xml file for it and installed it. I followed every step the OOT Python Tutorial explains. I see the category … --- ## [INFO: Detected an invalid packet at item INFO: Parser returned #f](https://www.ruby-forum.com/t/info-detected-an-invalid-packet-at-item-info-parser-returned-f/233993)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [January 31, 2015, 12:50pm UTC](https://www.ruby-forum.com/t/info-detected-an-invalid-packet-at-item-info-parser-returned-f/233993 "2015-01-31T12:50:32Z")
Hi all: Thank you in advance.I have searched the question"INFO: Detected an invalid packet at item INFO: Parser returned #f". The answer may be “RF settings are distorting your signal” or others.I want to ask a quest… --- ## [HDLC Deframer example](https://www.ruby-forum.com/t/hdlc-deframer-example/234021)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 30, 2015, 10:53pm UTC](https://www.ruby-forum.com/t/hdlc-deframer-example/234021 "2015-01-30T22:53:56Z")
Hi, I want to run a simple frame-deframe hdlc example. In the attached flow-graph the framed packet is printed through the “message debug” block. Why I do not receive any message in the output of the deframer? Thank… --- ## [RTL2832 USB for two frequencies](https://www.ruby-forum.com/t/rtl2832-usb-for-two-frequencies/234013)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 30, 2015, 1:21pm UTC](https://www.ruby-forum.com/t/rtl2832-usb-for-two-frequencies/234013 "2015-01-30T13:21:06Z")
Hello , with gnuradio , I was able to generate (following the tutorials on the net ) Narrow FM receiver that works with a USB RTL2832 . Now I’m trying to figure out if I can manage to simultaneously monitor two freque… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=35) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=37)