# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=2 [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:** 3 --- ## [GNU Radio Companion Download site down](https://www.ruby-forum.com/t/gnu-radio-companion-download-site-down/259142)
**Author:** [@bjl](https://www.ruby-forum.com/u/bjl)\ **Replies:** 0\ **Last updated:** [April 4, 2020, 7:21pm UTC](https://www.ruby-forum.com/t/gnu-radio-companion-download-site-down/259142 "2020-04-04T19:21:14Z")
Hi there, I was just getting into GNU radio documentation for the first time and was trying to install the GNU radio companion software for windows. The link in the wiki article (and google searches), http://www.gcndeve… --- ## [GNU Radio 3.8.0.0](https://www.ruby-forum.com/t/gnu-radio-3-8-0-0/259100)
**Author:** [@MaroonBeret](https://www.ruby-forum.com/u/MaroonBeret)\ **Replies:** 0\ **Last updated:** [April 1, 2020, 4:22am UTC](https://www.ruby-forum.com/t/gnu-radio-3-8-0-0/259100 "2020-04-01T04:22:16Z")
Hi, I am using GNU Radio 3.8.0.0 and unable to find the slider option and the scope sink. any alternatives ? --- ## [GNU Radio wx fft sink error](https://www.ruby-forum.com/t/gnu-radio-wx-fft-sink-error/258918)
**Author:** [@Pritha\_Bhattacharya](https://www.ruby-forum.com/u/Pritha_Bhattacharya)\ **Replies:** 0\ **Last updated:** [March 18, 2020, 5:25am UTC](https://www.ruby-forum.com/t/gnu-radio-wx-fft-sink-error/258918 "2020-03-18T05:25:54Z")
I have just started using GNU Radio Companion and was trying to follow Michael Ossmann’s lectures but got stuck at a very early stage. I have just connected an Osmocom source block to a WX GUI fft sink and somehow, the… --- ## [/usr/local/include/gnuradio/swig/gnuradio.i:31: Error: Unable to find 'gruel\_common.i'](https://www.ruby-forum.com/t/usr-local-include-gnuradio-swig-gnuradio-i-error-unable-to-find-gruel-common-i/220279)
**Author:** [@aris](https://www.ruby-forum.com/u/aris)\ **Replies:** 2\ **Last updated:** [March 10, 2020, 2:01am UTC](https://www.ruby-forum.com/t/usr-local-include-gnuradio-swig-gnuradio-i-error-unable-to-find-gruel-common-i/220279 "2020-03-10T02:01:22Z")
Hi, I am trying to run an old application that was working previously but when I upgraded to 3.6.1 I get the error in the title. Has anybody encountered and solved this problem? H.E. Baidoo-Williams GRA, University … --- ## [BER calculation - GMSK Demod block](https://www.ruby-forum.com/t/ber-calculation-gmsk-demod-block/258053)
**Author:** [@Artur1988](https://www.ruby-forum.com/u/Artur1988)\ **Replies:** 0\ **Last updated:** [March 9, 2020, 9:22pm UTC](https://www.ruby-forum.com/t/ber-calculation-gmsk-demod-block/258053 "2020-03-09T21:22:30Z")
Hello, I am simulating a simple GMSK modulation/demodulation process, without any channel model, in order to evaluate the BER under normal conditions and with noise. I would like to have your opinion about the way I cal… --- ## [Edit receive Functionaility in USRP Echotimer for USRP Source](https://www.ruby-forum.com/t/edit-receive-functionaility-in-usrp-echotimer-for-usrp-source/257583)
**Author:** [@avashist003](https://www.ruby-forum.com/u/avashist003)\ **Replies:** 0\ **Last updated:** [March 5, 2020, 6:24pm UTC](https://www.ruby-forum.com/t/edit-receive-functionaility-in-usrp-echotimer-for-usrp-source/257583 "2020-03-05T18:24:05Z")
Hi, I am using USRP Echotimer block that has one antenna as transmitter and other (RX2) as radar receiver. In my design, I want to switch between radar receiver to normal data receiver. The gnuradio does not allow to u… --- ## [OFDM Transceiver to send/receive messages](https://www.ruby-forum.com/t/ofdm-transceiver-to-send-receive-messages/256895)
**Author:** [@tuyo408](https://www.ruby-forum.com/u/tuyo408)\ **Replies:** 0\ **Last updated:** [February 29, 2020, 4:27pm UTC](https://www.ruby-forum.com/t/ofdm-transceiver-to-send-receive-messages/256895 "2020-02-29T16:27:57Z")
Hello, I am trying to implement an OFDM transceiver using 2 USRP B200 in order to use each one of them as a chat client using message passing, in order to send and receive messages on both. So far I have been able to m… --- ## [Syntax error in python file generated](https://www.ruby-forum.com/t/syntax-error-in-python-file-generated/255349)
**Author:** [@tuyo408](https://www.ruby-forum.com/u/tuyo408)\ **Replies:** 1\ **Last updated:** [February 29, 2020, 4:16pm UTC](https://www.ruby-forum.com/t/syntax-error-in-python-file-generated/255349 "2020-02-29T16:16:22Z")
Hello, I have the following error when running the basic OFDM example from GNU Radio. self.length\_tag\_key = length\_tag\_key = "packet\_len" ^ SyntaxError: invalid syntax The python file generated is executed by d… --- ## [Sliding correlator channel sounding flow graphs (Tx and Rx)](https://www.ruby-forum.com/t/sliding-correlator-channel-sounding-flow-graphs-tx-and-rx/256490)
**Author:** [@sacinold](https://www.ruby-forum.com/u/sacinold)\ **Replies:** 0\ **Last updated:** [February 26, 2020, 4:49pm UTC](https://www.ruby-forum.com/t/sliding-correlator-channel-sounding-flow-graphs-tx-and-rx/256490 "2020-02-26T16:49:50Z")
Hello everyone, Pls, i need transmitter and receiver flow graph of sliding correlator channel sounding. I want to used the flow graphs to measure radio propagation channel of a complex building environment. Thanks --- ## [First time user - fm radio tutorial has choppy audio](https://www.ruby-forum.com/t/first-time-user-fm-radio-tutorial-has-choppy-audio/233815)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 19\ **Last updated:** [February 23, 2020, 11:55am UTC](https://www.ruby-forum.com/t/first-time-user-fm-radio-tutorial-has-choppy-audio/233815 "2020-02-23T11:55:49Z")
Greetings, I’m a first time user of gnuradio. Kudos to the developers, it only took me about a day to build gnuradio + gr-osmosdr (for my el-cheapo rtl2832 dongle) from source, including getting a basic FM broadcast … --- ## [USRP N210 overflows in virtual machine using GnuRadio](https://www.ruby-forum.com/t/usrp-n210-overflows-in-virtual-machine-using-gnuradio/253638)
**Author:** [@ben\_F](https://www.ruby-forum.com/u/ben_F)\ **Replies:** 1\ **Last updated:** [February 3, 2020, 10:01am UTC](https://www.ruby-forum.com/t/usrp-n210-overflows-in-virtual-machine-using-gnuradio/253638 "2020-02-03T10:01:49Z")
I am using the USRP N210 through a Debian (4.19.0-6-amd64 #1 SMP Debian 4.19.67-2+deb10u1) VM and run very quickly into processing overflow. GnuRadio-Companion is printing the letter “D” the moment one of the CPUs load i… --- ## [Copy block changed in 3.8](https://www.ruby-forum.com/t/copy-block-changed-in-3-8/253642)
**Author:** [@ThunderGod](https://www.ruby-forum.com/u/ThunderGod)\ **Replies:** 2\ **Last updated:** [February 3, 2020, 9:39am UTC](https://www.ruby-forum.com/t/copy-block-changed-in-3-8/253642 "2020-02-03T09:39:13Z")
I have a problem with gnuradio 3.8. Seem the copy block in GRC is changed. It has a radio button for enable/disable. Now I can’t put a for example “variable\_qtgui\_check\_box” to control it. Any help or example how to cont… --- ## [How to set the carrier frequency on the GMSK Mod or GMSK Modulator blocks?](https://www.ruby-forum.com/t/how-to-set-the-carrier-frequency-on-the-gmsk-mod-or-gmsk-modulator-blocks/253691)
**Author:** [@Artur1988](https://www.ruby-forum.com/u/Artur1988)\ **Replies:** 0\ **Last updated:** [January 29, 2020, 11:33pm UTC](https://www.ruby-forum.com/t/how-to-set-the-carrier-frequency-on-the-gmsk-mod-or-gmsk-modulator-blocks/253691 "2020-01-29T23:33:26Z")
The only available adjustable parameters are the number of samples per symbol and BT = bandwidth of the gaussian filter\*bit period. I can be wrong, but I suppose that there is no connection between these parameters and t… --- ## [Transmit from RF1, receive from RF2](https://www.ruby-forum.com/t/transmit-from-rf1-receive-from-rf2/239697)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [January 29, 2020, 12:21pm UTC](https://www.ruby-forum.com/t/transmit-from-rf1-receive-from-rf2/239697 "2020-01-29T12:21:13Z")
Hi list, here is the thing. I would like to know, how I can create a flow with blocks in GNU Radio companion, in order to receive a signal from the RF1 port of my URSP N210 and simultaneously , receive another signa… --- ## [OOT Modules not showing up in GNURadio](https://www.ruby-forum.com/t/oot-modules-not-showing-up-in-gnuradio/253646)
**Author:** [@doogle27](https://www.ruby-forum.com/u/doogle27)\ **Replies:** 0\ **Last updated:** [January 24, 2020, 4:56pm UTC](https://www.ruby-forum.com/t/oot-modules-not-showing-up-in-gnuradio/253646 "2020-01-24T16:56:43Z")
Followed the instructions here to create an OOT module - https://wiki.gnuradio.org/index.php/Guided\_Tutorial\_GNU\_Radio\_in\_Python The cmake etc all works fine - cmake …/ make sudo make install sudo ldconfig But whe… --- ## [Failed to enable real-time scheduling](https://www.ruby-forum.com/t/failed-to-enable-real-time-scheduling/253644)
**Author:** [@guilherme\_bra](https://www.ruby-forum.com/u/guilherme_bra)\ **Replies:** 0\ **Last updated:** [January 24, 2020, 4:22pm UTC](https://www.ruby-forum.com/t/failed-to-enable-real-time-scheduling/253644 "2020-01-24T16:22:54Z")
Hi guys,im using GNU radio to try sent a BTS using an usrp. at the first moment, i disabled USRP block to verify if flowgraph was running. but the errer of real-time scheduling appeared. i already configured the .conf fi… --- ## [RMG encoder decoder blocks are missing](https://www.ruby-forum.com/t/rmg-encoder-decoder-blocks-are-missing/253541)
**Author:** [@Anshumantech](https://www.ruby-forum.com/u/Anshumantech)\ **Replies:** 0\ **Last updated:** [December 26, 2019, 6:49am UTC](https://www.ruby-forum.com/t/rmg-encoder-decoder-blocks-are-missing/253541 "2019-12-26T06:49:29Z")
Hello, I have installed GNU Radio Companion 3.7.13, under module selection RMG Encoder, RMG decoder blocks are missing so that i am not able to do tutorial mentioned at TutorialsSimulations - GNU Radio this site. What t… --- ## [XCode / SDCC Intel-Mac issue](https://www.ruby-forum.com/t/xcode-sdcc-intel-mac-issue/71736)
**Author:** [@mdeering](https://www.ruby-forum.com/u/mdeering)\ **Replies:** 2\ **Last updated:** [October 18, 2006, 10:40am UTC](https://www.ruby-forum.com/t/xcode-sdcc-intel-mac-issue/71736 "2006-10-18T10:40:55Z")
I made enough progress on this issue to know there is a problem, but that it’s beyond what I can investigate further until I have more time. What I’m doing instead is making the compiled and ready to install SDCC 2.4 … --- ## [Recognize Specific OOK Codes then Display Messages in Response](https://www.ruby-forum.com/t/recognize-specific-ook-codes-then-display-messages-in-response/253462)
**Author:** [@Dangeruss](https://www.ruby-forum.com/u/Dangeruss)\ **Replies:** 0\ **Last updated:** [December 12, 2019, 4:43pm UTC](https://www.ruby-forum.com/t/recognize-specific-ook-codes-then-display-messages-in-response/253462 "2019-12-12T16:43:11Z")
Hey Everybody, I’m looking to have Gnu-Radio (or some other program) recognize specific OOK codes on 433 mhz. When those codes are received I need them to display A message on a note-pad or on screen somewhere and then … --- ## [Fosphor, Intel OpenCL and Ubuntu 18.04 - help](https://www.ruby-forum.com/t/fosphor-intel-opencl-and-ubuntu-18-04-help/253374)
**Author:** [@alphanov](https://www.ruby-forum.com/u/alphanov)\ **Replies:** 0\ **Last updated:** [November 24, 2019, 1:38pm UTC](https://www.ruby-forum.com/t/fosphor-intel-opencl-and-ubuntu-18-04-help/253374 "2019-11-24T13:38:15Z")
Hello Thank you for accepting me to this forum. This is my first post so please be gentle with me. I’m struggling to get GR-Fosphor working on a Intel Core i5 machine. The OS is Ubuntu 18.04. I have attempted to get… --- ## [Updated UCLA ZigBee / IEEE802.15.4 blocks](https://www.ruby-forum.com/t/updated-ucla-zigbee-ieee802-15-4-blocks/227141)
**Author:** [@Bastian\_B](https://www.ruby-forum.com/u/Bastian_B)\ **Replies:** 3\ **Last updated:** [November 16, 2019, 12:54am UTC](https://www.ruby-forum.com/t/updated-ucla-zigbee-ieee802-15-4-blocks/227141 "2019-11-16T00:54:08Z")
Hi everyone, I updated the UCLA ZigBee blocks\[1\] to GNU Radio v3.6.4 (current master branch) and uploaded them to Github: Currently, it just features basic, separated rx/tx chains. There is also a simple firmware f… --- ## [Bluetooth Transmitter using GRC](https://www.ruby-forum.com/t/bluetooth-transmitter-using-grc/233775)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 10\ **Last updated:** [January 15, 2015, 7:51am UTC](https://www.ruby-forum.com/t/bluetooth-transmitter-using-grc/233775 "2015-01-15T07:51:19Z")
Hi All, I am searching for an implementation of a complete Bluetooth stack on GRC 3.7 ( Including the Bluetooth Transmitter and Receiver) preferably working with USRP N210. So far I got this “gr-Bluetooth, Bluetooth… --- ## [Gnuradio companion block selection window missing](https://www.ruby-forum.com/t/gnuradio-companion-block-selection-window-missing/225489)
**Author:** [@aris](https://www.ruby-forum.com/u/aris)\ **Replies:** 2\ **Last updated:** [October 30, 2019, 6:37am UTC](https://www.ruby-forum.com/t/gnuradio-companion-block-selection-window-missing/225489 "2019-10-30T06:37:36Z")
I just installed Gnuradio and UHD yesterday and have been playing with Gnuradio Companion. All was going well until a little while ago when I started it up the block selection window was gone. How do I get it back? I … --- ## [Gr-radar in Fedora 28](https://www.ruby-forum.com/t/gr-radar-in-fedora-28/253058)
**Author:** [@Frank\_v2](https://www.ruby-forum.com/u/Frank_v2)\ **Replies:** 1\ **Last updated:** [October 16, 2019, 6:36pm UTC](https://www.ruby-forum.com/t/gr-radar-in-fedora-28/253058 "2019-10-16T18:36:53Z")
Dear all, good day. I’ve installed on Fedora 28 both UHD and Gnuradio (sudo dnf install gnuradio uhd). All packages, including, gnuradio-companion seem to work ok. Unfortunately I could not install the gr-radio pac… --- ## [Sending Data/Messages to GNU Radio via Python Application](https://www.ruby-forum.com/t/sending-data-messages-to-gnu-radio-via-python-application/252992)
**Author:** [@goradiar](https://www.ruby-forum.com/u/goradiar)\ **Replies:** 0\ **Last updated:** [September 9, 2019, 2:13am UTC](https://www.ruby-forum.com/t/sending-data-messages-to-gnu-radio-via-python-application/252992 "2019-09-09T02:13:50Z")
Hello: I am trying to make use of the ZMQ blocks in GNU Radio to act as a server and have a separate python client application send data/messages to GNU Radio. I was successful in getting data out of GNU Radio and usin… --- ## [I am trying to add an additional 'int' parameter in an OOT module](https://www.ruby-forum.com/t/i-am-trying-to-add-an-additional-int-parameter-in-an-oot-module/252987)
**Author:** [@mia](https://www.ruby-forum.com/u/mia)\ **Replies:** 0\ **Last updated:** [September 6, 2019, 12:45pm UTC](https://www.ruby-forum.com/t/i-am-trying-to-add-an-additional-int-parameter-in-an-oot-module/252987 "2019-09-06T12:45:51Z")
I have a functioning OOT block in GNU radio. I am just trying to add an extra parameter to it to increase the block’s flexibility via GRC . I have made appropriate modifications in all the .h, .cc files corresponding to… --- ## [GNU Radio block for autoconvolution](https://www.ruby-forum.com/t/gnu-radio-block-for-autoconvolution/252959)
**Author:** [@lisdy](https://www.ruby-forum.com/u/lisdy)\ **Replies:** 0\ **Last updated:** [August 29, 2019, 1:26pm UTC](https://www.ruby-forum.com/t/gnu-radio-block-for-autoconvolution/252959 "2019-08-29T13:26:30Z")
Hello everyone, I need your help. I would like to know which GNU radio block I can use to do data autocorrelation with N points. Thank you in advance for your help Grecia --- ## [OOT block with varible type of input/output](https://www.ruby-forum.com/t/oot-block-with-varible-type-of-input-output/252942)
**Author:** [@alireza](https://www.ruby-forum.com/u/alireza)\ **Replies:** 0\ **Last updated:** [August 25, 2019, 7:24am UTC](https://www.ruby-forum.com/t/oot-block-with-varible-type-of-input-output/252942 "2019-08-25T07:24:05Z")
How to design OOT block similar to add\_const\_vXX.cc.t in template form ,I want to design a block that find out difference between float input and integer input but because size of both is 4 bytes ,i don’t handle it,so … --- ## [Newcomer in the GNU Radio World](https://www.ruby-forum.com/t/newcomer-in-the-gnu-radio-world/252814)
**Author:** [@upt1000](https://www.ruby-forum.com/u/upt1000)\ **Replies:** 0\ **Last updated:** [July 31, 2019, 2:21pm UTC](https://www.ruby-forum.com/t/newcomer-in-the-gnu-radio-world/252814 "2019-07-31T14:21:53Z")
Hello, I am a newbie in the GNU Radio. I use Windows 10 as an operating system and I have downloaded the GNU Radio Companion application, and I also have an RTL-SDR antenna and dongle that can be connected into a USB por… --- ## [Looking for working "hello world" example for "function probe" with "signal probe"](https://www.ruby-forum.com/t/looking-for-working-hello-world-example-for-function-probe-with-signal-probe/218332)
**Author:** [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Replies:** 5\ **Last updated:** [July 18, 2019, 6:39pm UTC](https://www.ruby-forum.com/t/looking-for-working-hello-world-example-for-function-probe-with-signal-probe/218332 "2019-07-18T18:39:17Z")
Hi, I’m looking for a working “hello world” example for using “function probe” with “signal probe” in gnuradio companion. I can’t get it to work with the existing documentation found. Thanks for any input. Mario [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=1) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=3)