# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=41 [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:** 42 --- ## [Pipe data from GRC through shell command (like gr-pipe in 3.6)?](https://www.ruby-forum.com/t/pipe-data-from-grc-through-shell-command-like-gr-pipe-in-3-6/233472)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 17, 2014, 1:32am UTC](https://www.ruby-forum.com/t/pipe-data-from-grc-through-shell-command-like-gr-pipe-in-3-6/233472 "2014-12-17T01:32:28Z")
I want to pipe data from GRC “through” a command running in the linux shell. I found gr-pipe on github, but it seems to be for 3.6 only. Until now I have used file sinks / sources and FIFOs, but this is inconvenient a… --- ## [Openbts workshop in 2015](https://www.ruby-forum.com/t/openbts-workshop-in-2015/233478)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 16, 2014, 10:24pm UTC](https://www.ruby-forum.com/t/openbts-workshop-in-2015/233478 "2014-12-16T22:24:03Z")
hi people i am a newbie to openbts and would like to visit a workshop but cant find anything sheduled for 2015 could u please help me and point me in the right direction where and when i could visit a workshop. i am f… --- ## [Odd Behavior](https://www.ruby-forum.com/t/odd-behavior/233458)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 16, 2014, 1:14am UTC](https://www.ruby-forum.com/t/odd-behavior/233458 "2014-12-16T01:14:52Z")
Problem: Real and Imaginary outputs of CPFSK sometimes seem flipped in the transmitter. I’m using the CPFSK block to modulate for a binary FSK radio. All that I reference here is in the transmitter. There are 3 input… --- ## [GRC display category \[none\]](https://www.ruby-forum.com/t/grc-display-category-none/233455)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [December 15, 2014, 7:33pm UTC](https://www.ruby-forum.com/t/grc-display-category-none/233455 "2014-12-15T19:33:19Z")
Hello all, are there any means of showing blocks in GRC, which are assigned to catetegory “\[None\]”? If I search in GRC for blocks without a (recognized) category, these blocks are shown, but with an empty search stri… --- ## [Audio sink issue](https://www.ruby-forum.com/t/audio-sink-issue/233453)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 15, 2014, 2:07pm UTC](https://www.ruby-forum.com/t/audio-sink-issue/233453 "2014-12-15T14:07:31Z")
Hi I am trying to implement the following acoustic communication transmitter with PC File Source --\> Packet encoder --\> gmsk mod --\> Rational resampler –\> Frequency Xlating FIR filter --\> comp to real --\> audio sink … --- ## [USRP N210 for sale](https://www.ruby-forum.com/t/usrp-n210-for-sale/226526)
**Author:** [@sprsquish](https://www.ruby-forum.com/u/sprsquish)\ **Replies:** 17\ **Last updated:** [December 15, 2014, 8:00am UTC](https://www.ruby-forum.com/t/usrp-n210-for-sale/226526 "2014-12-15T08:00:40Z")
I am putting up my SDR for sale. It is a ettus research USRP N210. I haven’t had the time to really work with it and it deserves to find a good home. It is still in new condition and here is a link to the manufacturer… --- ## [Sale: Ettus Research USRP N210 + SBX board](https://www.ruby-forum.com/t/sale-ettus-research-usrp-n210-sbx-board/239845)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [December 15, 2014, 7:55am UTC](https://www.ruby-forum.com/t/sale-ettus-research-usrp-n210-sbx-board/239845 "2014-12-15T07:55:22Z")
Hello! I am selling SDR devices, used: 1 x Ettus R. USRP N210 ($1600) Datasheet: https://www.ettus.com/content/files/07495\_Ettus\_N200-210\_DS\_Flyer\_HR\_1.pdf 1 x Ethernet cable 1 x Power supply 1 x Ettus R. SBX boar… --- ## [N210s, USRP2s, daughterboards for sale](https://www.ruby-forum.com/t/n210s-usrp2s-daughterboards-for-sale/231655)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 15, 2014, 7:53am UTC](https://www.ruby-forum.com/t/n210s-usrp2s-daughterboards-for-sale/231655 "2014-12-15T07:53:52Z")
My employer is closing up shop and were selling our Ettus gear (along with some other lab gear). 4 - N210 2 - USRP2 2 - DBSRX 6 - DBSRX2 (At least one of these has been modified, though) 3 - SBX 5 - LFRX 1 - LFTX … --- ## [For Sale: 2x USRP N210 rev 4 w/ SBX daugherboards](https://www.ruby-forum.com/t/for-sale-2x-usrp-n210-rev-4-w-sbx-daugherboards/232076)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 15, 2014, 7:52am UTC](https://www.ruby-forum.com/t/for-sale-2x-usrp-n210-rev-4-w-sbx-daugherboards/232076 "2014-12-15T07:52:08Z")
I am selling my two USRP N210’s (rev 4) with SBX daughterboards so I can migrate to B210’s. Both N210’s are in excellent condition, and include SBX daughterboards and power supplies. I am selling the pair for $2800,… --- ## [Trouble at OFDM demodulation](https://www.ruby-forum.com/t/trouble-at-ofdm-demodulation/233431)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 12, 2014, 7:00pm UTC](https://www.ruby-forum.com/t/trouble-at-ofdm-demodulation/233431 "2014-12-12T19:00:08Z")
Good Morning Sir, Iam trying to\* impliment OFDM Mod & De Mod on GNU Radio\*.But at demodulation i got error like below.Will you please help me regarding this ERROR: allocate\_buffer: warning: tried to allocate 40 i… --- ## [Re: gr::blocks::peak\_detector2\_fb un reproducible behavior](https://www.ruby-forum.com/t/re-gr-peak-detector2-fb-un-reproducible-behavior/233430)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 12, 2014, 5:31pm UTC](https://www.ruby-forum.com/t/re-gr-peak-detector2-fb-un-reproducible-behavior/233430 "2014-12-12T17:31:10Z")
Hello, a short update before the weekend: I was not able to hunt down the problem of non-reproducibility, but another one. I had an input signal, which had its max. value as the first value getting over the (very hi… --- ## [Trouble reexecuting a microphone audio source](https://www.ruby-forum.com/t/trouble-reexecuting-a-microphone-audio-source/233389)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 12, 2014, 4:02pm UTC](https://www.ruby-forum.com/t/trouble-reexecuting-a-microphone-audio-source/233389 "2014-12-12T16:02:13Z")
I’m just getting started with grc but I am having problems already. I have a simple flow graph: an audio source with a device name “hw:1,0” connected to a WX scope sink. hw:1,0 is my Logitech headset according to ‘are… --- ## [Gr::blocks::peak\_detector2\_fb un reproducible behavior](https://www.ruby-forum.com/t/gr-peak-detector2-fb-un-reproducible-behavior/233428)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 12, 2014, 2:07pm UTC](https://www.ruby-forum.com/t/gr-peak-detector2-fb-un-reproducible-behavior/233428 "2014-12-12T14:07:59Z")
Hi Community, I have a problem concerning the gr::blocks::peak\_detector2\_fb class (as far as I think). I does not seem to perform deterministically, although the constraining blocks are deterministic. But first, plea… --- ## [Gnu installation](https://www.ruby-forum.com/t/gnu-installation/233424)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 12, 2014, 9:59am UTC](https://www.ruby-forum.com/t/gnu-installation/233424 "2014-12-12T09:59:18Z")
When I execute cmake …/ command, I am getting as follows sdr@sdr-H55H-CM:~$ cd gnuradio/ sdr@sdr-H55H-CM:~/gnuradio$ cd build/ sdr@sdr-H55H-CM:~/gnuradio/build$ cmake …/ – Build type not specified: defaulting to rele… --- ## [GUI Scaling](https://www.ruby-forum.com/t/gui-scaling/233423)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 12, 2014, 9:51am UTC](https://www.ruby-forum.com/t/gui-scaling/233423 "2014-12-12T09:51:56Z")
Is there a way to avoid what’s happening in this screenshot? I don’t want the slider heights to match the heights of the plots I placed into the column next to them. I want to decouple the gui row height between colu… --- ## [Query about GNU installation](https://www.ruby-forum.com/t/query-about-gnu-installation/233407)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 11, 2014, 3:25pm UTC](https://www.ruby-forum.com/t/query-about-gnu-installation/233407 "2014-12-11T15:25:58Z")
I already installed GNU Radio after installing UHD drivers only. While executing cmake …/ command, it’s showing all the blocks but when I tried to open GRC, it shows very few blocks. For better understanding I enclos… --- ## [GNU blocks](https://www.ruby-forum.com/t/gnu-blocks/233400)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [December 11, 2014, 8:04am UTC](https://www.ruby-forum.com/t/gnu-blocks/233400 "2014-12-11T08:04:16Z")
I installed by the following link http://gnuradio.org/redmine/projects/gnuradio/wiki/UbuntuInstall#Precise-Pangolin-1204 when I used git clone gnuradio.git - GNU Radio it automatically installed gnuradio 3.7.6 versio… --- ## [Usrp b210 and mimo](https://www.ruby-forum.com/t/usrp-b210-and-mimo/233342)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 11, 2014, 2:27am UTC](https://www.ruby-forum.com/t/usrp-b210-and-mimo/233342 "2014-12-11T02:27:03Z")
I’ve slowly gathered the courage to try out the B210 devices. I was impressed by the fact that I could get 50 MHz of bandwidth out of it. However, I immediately ran into problems with absolute timing. I’ve been using … --- ## [GRC - specifying version for install](https://www.ruby-forum.com/t/grc-specifying-version-for-install/233399)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 10, 2014, 8:33pm UTC](https://www.ruby-forum.com/t/grc-specifying-version-for-install/233399 "2014-12-10T20:33:11Z")
Hi, I have only used pybombs to install GRC and it is a fantasic way to get this done. Thanks very much for pybombs! I do notice though that there is no mention of which version will be installed. For example I ha… --- ## [GNU Installation](https://www.ruby-forum.com/t/gnu-installation/233396)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 10, 2014, 12:37pm UTC](https://www.ruby-forum.com/t/gnu-installation/233396 "2014-12-10T12:37:31Z")
I installed GNU Radio by using following link http://gnuradio.org/redmine/projects/gnuradio/wiki/UbuntuInstall#Precise-Pangolin-1204 it installed GNU Radio 3.7.6 version but I didn’t get all the blocks in GNU user int… --- ## [Two WBX boards synchronization](https://www.ruby-forum.com/t/two-wbx-boards-synchronization/233369)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [December 10, 2014, 9:59am UTC](https://www.ruby-forum.com/t/two-wbx-boards-synchronization/233369 "2014-12-10T09:59:43Z")
Hi all guys, I am about to make a receiver with two WBX daughterboards. I want to receive simultaneusly with horizontal and vertical antenna. For this purpose I want to use 4RX FPGA image. My question signals obtained… --- ## [AttributeError: 'module' object has no attribute 'block\_name'](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-block-name/233027)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 10, 2014, 7:56am UTC](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-block-name/233027 "2014-12-10T07:56:34Z")
Hello all, I’ve just created a block called “sliding\_fft”. The \_impl.h file looks like: #include \ namespace gr { namespace lte\_dl\_rx { class sliding\_fft\_impl : public sliding\_fft { private: … --- ## [Building BOOT.BIN for Zedboard to use with gnuradio-dev-image](https://www.ruby-forum.com/t/building-boot-bin-for-zedboard-to-use-with-gnuradio-dev-image/233383)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [December 9, 2014, 8:40pm UTC](https://www.ruby-forum.com/t/building-boot-bin-for-zedboard-to-use-with-gnuradio-dev-image/233383 "2014-12-09T20:40:10Z")
I’d like to use the gnuradio openembedded SDK and image that are available here \[1\] to reproduce the work here \[2\] without building my own openembedded image. I’m having trouble getting a working boot.bin for Zedboard… --- ## [How send random values to selector every n-times](https://www.ruby-forum.com/t/how-send-random-values-to-selector-every-n-times/233362)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 8, 2014, 11:17pm UTC](https://www.ruby-forum.com/t/how-send-random-values-to-selector-every-n-times/233362 "2014-12-08T23:17:54Z")
Hi everybody, I need to “switch” randomly 5 different signal generator via selector block every \[say\] 3 seconds… So , in GRC, I’ve a vector\_source with values coming from \[random.randint(0, 4) for p in range(0,4)\]. … --- ## [Bandpass Sampling](https://www.ruby-forum.com/t/bandpass-sampling/233374)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [December 8, 2014, 8:54pm UTC](https://www.ruby-forum.com/t/bandpass-sampling/233374 "2014-12-08T20:54:22Z")
I have a binary FSK signal centered at 300 MHz with 160 kHz offset peaks from the center freak. Therefore the lowest signal frequency of interest is 300-0.16 = 299.84 MHz and the highest is 300.16 MHz. I know the max… --- ## [Update to gr-dvbt2](https://www.ruby-forum.com/t/update-to-gr-dvbt2/233370)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 8, 2014, 7:54pm UTC](https://www.ruby-forum.com/t/update-to-gr-dvbt2/233370 "2014-12-08T19:54:14Z")
The gr-dvbt2 DVB-T2 transmitter has now been tested with a real receiver (a PCTV 292e USB stick). The BBC 32K/256QAM mode works fine on bladeRF (40.2 Mbps in an 8 MHz channel). CPU usage is about 60% on all four cores… --- ## [Cmake rule to compile GRC files with GRCC](https://www.ruby-forum.com/t/cmake-rule-to-compile-grc-files-with-grcc/233354)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 8, 2014, 8:48am UTC](https://www.ruby-forum.com/t/cmake-rule-to-compile-grc-files-with-grcc/233354 "2014-12-08T08:48:22Z")
Hi all, In my third party gnuradio project - gr-gsm (GitHub - ptrkrysik/gr-gsm: Gnuradio blocks and tools for receiving GSM transmissions) - I’m using gnuradio companion to create apps. Different versions of gnuradio … --- ## [Transmit time synchronization](https://www.ruby-forum.com/t/transmit-time-synchronization/233358)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 7, 2014, 7:05pm UTC](https://www.ruby-forum.com/t/transmit-time-synchronization/233358 "2014-12-07T19:05:24Z")
Hello all, Ive been trying to achieve transmit time synchronization for over a month now using GNURadio and USRP B200, and so far i have had limited success. I could not find alot online. My question is simple. Is i… --- ## [GPS Spoofer developed in gnuradio](https://www.ruby-forum.com/t/gps-spoofer-developed-in-gnuradio/233360)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 7, 2014, 7:01pm UTC](https://www.ruby-forum.com/t/gps-spoofer-developed-in-gnuradio/233360 "2014-12-07T19:01:06Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Rtl\_tcp issue](https://www.ruby-forum.com/t/rtl-tcp-issue/241311)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [December 6, 2014, 7:21pm UTC](https://www.ruby-forum.com/t/rtl-tcp-issue/241311 "2014-12-06T19:21:24Z")
Hi! I hope this is the right place to ask my my question, otherwise, please let me know where i can ask… I’m playing with rtl\_tcp since 2 yrs (or more…), but very very very often (almost always), when i connect to … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=40) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=42)