# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=54 [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:** 55 --- ## [Fwd: Re: USING SET/GET\_GAIN UHD USRP FUNCTION](https://www.ruby-forum.com/t/fwd-re-using-set-get-gain-uhd-usrp-function/231819)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [September 1, 2014, 3:51pm UTC](https://www.ruby-forum.com/t/fwd-re-using-set-get-gain-uhd-usrp-function/231819 "2014-09-01T15:51:52Z")
\-------- Original Message -------- Subject: Re: \[Discuss-gnuradio\] USING SET/GET\_GAIN UHD USRP FUNCTION Date: Fri, 29 Aug 2014 11:33:03 +0200 From: Simone Ciccia S210664 removed\_email\_address@domain.invalid To: Marti… --- ## [Beginner](https://www.ruby-forum.com/t/beginner/231785)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [September 1, 2014, 5:33am UTC](https://www.ruby-forum.com/t/beginner/231785 "2014-09-01T05:33:02Z")
Hello list, First of all, thanks for the great tool. I am a newbie, just started to play with gnuradio. For the start, I’d like to implement some simple, low bit rate modem. I don’t have any particular hardware, so … --- ## [SDR advice for newcomer?](https://www.ruby-forum.com/t/sdr-advice-for-newcomer/231715)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [September 1, 2014, 4:49am UTC](https://www.ruby-forum.com/t/sdr-advice-for-newcomer/231715 "2014-09-01T04:49:52Z")
I have experience in DSP but am completely new to Gnuradio and excited to get started. Because I’m also a ham I am thinking of buying one of lp-pan (US $250) softrock Ensemble II (US $87) and have a linux-only comp… --- ## [Question about ZeroMQ Sub source](https://www.ruby-forum.com/t/question-about-zeromq-sub-source/231790)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [August 31, 2014, 1:19pm UTC](https://www.ruby-forum.com/t/question-about-zeromq-sub-source/231790 "2014-08-31T13:19:43Z")
I’ve got a question relating to the zmq sub source. I’ve got a flowgraph that has rtlsdr -\> pub sink In another graph, I decode FM radio using WBFM receive. I noticed that it sounds horrible and choppy (sped up). I l… --- ## [Installing GNURadio 3.4.2 with Ubuntu 14.04](https://www.ruby-forum.com/t/installing-gnuradio-3-4-2-with-ubuntu-14-04/231771)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 30, 2014, 3:17pm UTC](https://www.ruby-forum.com/t/installing-gnuradio-3-4-2-with-ubuntu-14-04/231771 "2014-08-30T15:17:34Z")
Hello, I need install the uwicore\_MAC module ( http://www.uwicore.umh.es/mhop-software.html) to modify the 802.11 protocol and test some ideas. I already tryed install the module in version 3.7.4 without success. I … --- ## [Clock synchronization B210](https://www.ruby-forum.com/t/clock-synchronization-b210/231763)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 29, 2014, 2:14pm UTC](https://www.ruby-forum.com/t/clock-synchronization-b210/231763 "2014-08-29T14:14:37Z")
Hello all, I am using the B210 without an external 10MHz clock and without a GPSDO mounted. As expected I see a frequency and sampling time error on the captured samples. Once this sampling time error is estimated, I … --- ## [.bin to .cfile flowgraph for GRC 3.7.2.1](https://www.ruby-forum.com/t/bin-to-cfile-flowgraph-for-grc-3-7-2-1/231769)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 29, 2014, 7:37am UTC](https://www.ruby-forum.com/t/bin-to-cfile-flowgraph-for-grc-3-7-2-1/231769 "2014-08-29T07:37:39Z")
Hello, I have tried opening the flow graph for coverting .bin file (data captured via sdr rtl) to .cfile for analysis. I downloaded the file from the link below http://sdr.osmocom.org/trac/attachment/wiki/rtl-sdr/rtl… --- ## [M2m4 SNR estimator off by 3 dB](https://www.ruby-forum.com/t/m2m4-snr-estimator-off-by-3-db/234818)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [August 29, 2014, 12:11am UTC](https://www.ruby-forum.com/t/m2m4-snr-estimator-off-by-3-db/234818 "2014-08-29T00:11:13Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Using set/get\_gain uhd usrp function](https://www.ruby-forum.com/t/using-set-get-gain-uhd-usrp-function/231758)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 28, 2014, 6:55pm UTC](https://www.ruby-forum.com/t/using-set-get-gain-uhd-usrp-function/231758 "2014-08-28T18:55:48Z")
hi, I have some problem to use USRP UHD set/get\_gain functions. In my code, \_impl.cc I have included: #include \ the header file in which virtual double get\_gain() and virtual void set\_gai… --- ## [Error when installing gnuradio 3.7](https://www.ruby-forum.com/t/error-when-installing-gnuradio-3-7/231761)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [August 28, 2014, 6:46pm UTC](https://www.ruby-forum.com/t/error-when-installing-gnuradio-3-7/231761 "2014-08-28T18:46:04Z")
Hi All, I am trying to install gnuradio v3.7. It is not the first time I do this installation, but it is the first time I got the attached error in the cmake step. Any help is welcomed. Thank you. Regards, Azza --- ## [GRCP Monitor and Non-Numbers (C++ rpc register)](https://www.ruby-forum.com/t/grcp-monitor-and-non-numbers-c-rpc-register/231751)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 28, 2014, 3:59pm UTC](https://www.ruby-forum.com/t/grcp-monitor-and-non-numbers-c-rpc-register/231751 "2014-08-28T15:59:11Z")
Hello I am attempting to get and set strings via ControlPort, but I keep getting the traceback error below when I right-click to set a value in the ControlPort monitor (which I am using to ensure I am setting up the … --- ## [GNU Radio Companion missing source](https://www.ruby-forum.com/t/gnu-radio-companion-missing-source/231701)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 18\ **Last updated:** [August 28, 2014, 12:20am UTC](https://www.ruby-forum.com/t/gnu-radio-companion-missing-source/231701 "2014-08-28T00:20:49Z")
I just installed GNU on a Ubuntu 14.04 LTS machine. Here is how I installed it: “sudo apt-get install gnuradio” All appeared good, I thing typed “gnuradio-companion” and got the it up and running. Problem: On the ri… --- ## [Using block argument](https://www.ruby-forum.com/t/using-block-argument/231741)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 27, 2014, 3:25pm UTC](https://www.ruby-forum.com/t/using-block-argument/231741 "2014-08-27T15:25:15Z")
hi, I have created with gr\_modtool a block in which is assigned as argument a float, “threshold”. In the file \_impl.h I have defined another variable called “d\_threshold” in the private sector, while in the constru… --- ## [Problems with gr-osmosdr and dual-channel B210 support](https://www.ruby-forum.com/t/problems-with-gr-osmosdr-and-dual-channel-b210-support/231740)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 27, 2014, 2:32pm UTC](https://www.ruby-forum.com/t/problems-with-gr-osmosdr-and-dual-channel-b210-support/231740 "2014-08-27T14:32:49Z")
I’m getting this startup sequence here: linux; GNU C++ version 4.8.2; Boost\_105400; UHD\_003.007.002-85-g5ffc835e Using Volk machine: ssse3\_32\_orc gr-osmosdr v0.1.1-13-g58d95b51 (0.1.2git) gnuradio 3.7.4 built-in sour… --- ## [Gr-fosphor. builds OK, throws runtime error](https://www.ruby-forum.com/t/gr-fosphor-builds-ok-throws-runtime-error/231734)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [August 27, 2014, 1:30pm UTC](https://www.ruby-forum.com/t/gr-fosphor-builds-ok-throws-runtime-error/231734 "2014-08-27T13:30:40Z")
Ubuntu 14.04. Have updated to gnuradio 3.7.5git-194-g76a271ac, seems to run fine. I rebuilt / reinstalled gr-fosphor. No problems with the build. The location of Nvidia’s OpenCL library changed from Ubuntu 13.10 to 1… --- ## [Custom Blocks - Windows](https://www.ruby-forum.com/t/custom-blocks-windows/231736)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 27, 2014, 11:39am UTC](https://www.ruby-forum.com/t/custom-blocks-windows/231736 "2014-08-27T11:39:13Z")
Hi, I am in the process of creating a custom block for GRC - I have managed to write the C++, compile and install it all on Linux, but I was hoping that it would be simple to port that over to Windows (Maybe just plac… --- ## [Gr-ais not decoding AIS data](https://www.ruby-forum.com/t/gr-ais-not-decoding-ais-data/231733)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 27, 2014, 12:50am UTC](https://www.ruby-forum.com/t/gr-ais-not-decoding-ais-data/231733 "2014-08-27T00:50:15Z")
Hi, I’ve just started poking around with gr-ais on a new Ubuntu 14.04 install. I grabbed it from GitHub - bistromath/gr-ais: Automatic Information System decoder for shipborne position reporting for the Gnuradio projec… --- ## [GNU Radio support on MicroZed](https://www.ruby-forum.com/t/gnu-radio-support-on-microzed/231687)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [August 27, 2014, 12:44am UTC](https://www.ruby-forum.com/t/gnu-radio-support-on-microzed/231687 "2014-08-27T00:44:46Z")
I’m not the world’s foremost expert in OpenEmbedded (read: person with nearly no knowledge of how to use it). I’d like to get GNU Radio working on a MicroZed. Unfortunately that board is not among the boards supported… --- ## [A crazy problem with GNURadio fft](https://www.ruby-forum.com/t/a-crazy-problem-with-gnuradio-fft/231722)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [August 26, 2014, 6:34pm UTC](https://www.ruby-forum.com/t/a-crazy-problem-with-gnuradio-fft/231722 "2014-08-26T18:34:57Z")
Hi all, I was wonder why my codes in Matlab aren’t compatible with GNURadio ones! After all, I found the fft output in GNURadio is different to Matlab!! Here is my simple code for fft testing with the real inputs of … --- ## [Query on creating a Transfer function block](https://www.ruby-forum.com/t/query-on-creating-a-transfer-function-block/231725)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 26, 2014, 4:50pm UTC](https://www.ruby-forum.com/t/query-on-creating-a-transfer-function-block/231725 "2014-08-26T16:50:28Z")
Hello All, I want to create a block which takes input of two streams ( Tx1 and Tx2 ) and give output of two streams, o1 = a \* Tx1 + b \* Tx2 o2 = c \* Tx1 + d \* Tx2, where a,b,c and d are complex constants. Can anyb… --- ## [OFDM transmitter receiver](https://www.ruby-forum.com/t/ofdm-transmitter-receiver/231706)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 26, 2014, 11:13am UTC](https://www.ruby-forum.com/t/ofdm-transmitter-receiver/231706 "2014-08-26T11:13:47Z")
Hi I used the ofdm transmitter receiver blocks to create a simple system as shown in the attachment. I used the system parameters as those used in the example transmitter and receiver grcs. Now I get error that ‘Dete… --- ## [Re: OFDM transmitter receiver](https://www.ruby-forum.com/t/re-ofdm-transmitter-receiver/231718)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 26, 2014, 6:58am UTC](https://www.ruby-forum.com/t/re-ofdm-transmitter-receiver/231718 "2014-08-26T06:58:14Z")
kernel.shmmax gave value 2147483648. Sreena --- ## [Metafile Sink Execution Time](https://www.ruby-forum.com/t/metafile-sink-execution-time/231713)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [August 26, 2014, 5:32am UTC](https://www.ruby-forum.com/t/metafile-sink-execution-time/231713 "2014-08-26T05:32:23Z")
How long it takes for the Metafile Sink to began recording data? I have a “No GUI” script that is a simple USRP source, throttle, and metafile sink. All have a 1M sample rates; the metafile sink has a relative rate o… --- ## [Ctest can't find gnuradio module](https://www.ruby-forum.com/t/ctest-cant-find-gnuradio-module/231716)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 26, 2014, 5:31am UTC](https://www.ruby-forum.com/t/ctest-cant-find-gnuradio-module/231716 "2014-08-26T05:31:47Z")
I have looked all over and find this question asked but not answered. I have been following the OOT tutorial to make my own OOT block. Everything seems to compile correctly but when I run ‘make test’ from the build fo… --- ## [GR, USRP, and GPIB measurements](https://www.ruby-forum.com/t/gr-usrp-and-gpib-measurements/231321)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 15\ **Last updated:** [August 25, 2014, 4:43pm UTC](https://www.ruby-forum.com/t/gr-usrp-and-gpib-measurements/231321 "2014-08-25T16:43:57Z")
There have been a few messages on both GR and USRP lists about choosing proper hardware gain settings. I figured I’d write some code to sweep a B200 over frequency and gain, and generate some plots that are handy for … --- ## [ImportError: cannot import name blks2](https://www.ruby-forum.com/t/importerror-cannot-import-name-blks2/234790)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 25, 2014, 4:05pm UTC](https://www.ruby-forum.com/t/importerror-cannot-import-name-blks2/234790 "2014-08-25T16:05:13Z")
Somewhat a NOOB to Python, USRP, GNURadio… and needing some help. I am getting the error (below) when I try to execute a Python xxx.py progam… ImportError: cannot import name blks2 Here is what I am trying to do. I … --- ## [Tx\_ofdm and rx\_ofdm](https://www.ruby-forum.com/t/tx-ofdm-and-rx-ofdm/229993)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 7\ **Last updated:** [August 25, 2014, 4:02pm UTC](https://www.ruby-forum.com/t/tx-ofdm-and-rx-ofdm/229993 "2014-08-25T16:02:30Z")
Hi: Now I run the example(tx\_ofdm and rx\_ofdm) through two usrps.(The version of my gnuradio is 3.7.4). 1.But in the receive part I receive two many things like this: INFO: Detected an invalid packet at item 139632 … --- ## [Installing GNURadio 3.3.0 in Ubuntu 14.04](https://www.ruby-forum.com/t/installing-gnuradio-3-3-0-in-ubuntu-14-04/231681)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [August 25, 2014, 3:07pm UTC](https://www.ruby-forum.com/t/installing-gnuradio-3-3-0-in-ubuntu-14-04/231681 "2014-08-25T15:07:07Z")
Hello, In appendix follow the log of ./configure and make. I’m having problem with libboost in the lines of command make: … /bin/bash …/…/…/libtool --tag=CXX --mode=link g++ -g -O2 -Wall -Woverloaded-virtual -pt… --- ## [Error message, trying to start Simple\_ra](https://www.ruby-forum.com/t/error-message-trying-to-start-simple-ra/231704)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 25, 2014, 2:43am UTC](https://www.ruby-forum.com/t/error-message-trying-to-start-simple-ra/231704 "2014-08-25T02:43:44Z")
I’m new to this, so I don’t know how to fix this. I think my install went OK on Ubuntu 14.04 with GR 3.7, but when I try to run Simple\_ra I get the following: File “/home/jack/bin/simple\_ra\_receiver.py”, line 449 ti… --- ## [Problem linking volk gnuradio3.7.4](https://www.ruby-forum.com/t/problem-linking-volk-gnuradio3-7-4/231698)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 24, 2014, 2:15pm UTC](https://www.ruby-forum.com/t/problem-linking-volk-gnuradio3-7-4/231698 "2014-08-24T14:15:03Z")
Hi all, I have gnuradio-3.7.3 working fine with boost-1.50 on ubuntu 12.04, and I’m using USRP B200 with uhd3.7, all built from source. Now I’m moving to gnuradio-3.7.4, but I got the following error linking volk, at … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=53) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=55)