# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=58 [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:** 59 --- ## [Help on cmake command](https://www.ruby-forum.com/t/help-on-cmake-command/231391)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 6, 2014, 4:41am UTC](https://www.ruby-forum.com/t/help-on-cmake-command/231391 "2014-08-06T04:41:06Z")
Hello all I tried to build the following program in Windows 8 command line http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules Using the commands mkdirbuild cd build cmake …/ However, the command c… --- ## [Install help](https://www.ruby-forum.com/t/install-help/231360)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [August 6, 2014, 12:55am UTC](https://www.ruby-forum.com/t/install-help/231360 "2014-08-06T00:55:30Z")
Hello all, I’m having trouble getting the UHD USRP block category to show up in GRC. Can someone hep me through this issue. Here are the steps I’ve taken using Ubuntu 13.10: Uninstalled gnuradio and uhd using the… --- ## [Adding controlPort to GNURadio tree](https://www.ruby-forum.com/t/adding-controlport-to-gnuradio-tree/231385)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 5, 2014, 9:25pm UTC](https://www.ruby-forum.com/t/adding-controlport-to-gnuradio-tree/231385 "2014-08-05T21:25:28Z")
Hello all, I recently started to work with controlport because I think exploit its ability for my projetc. I found an example of grc using controlport at \*\*\*/gnuradio/gr-blocks/examples/ctrlport but it couldn’t find … --- ## [Short Survey for all Students using GNU Radio](https://www.ruby-forum.com/t/short-survey-for-all-students-using-gnu-radio/231384)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 5, 2014, 9:18pm UTC](https://www.ruby-forum.com/t/short-survey-for-all-students-using-gnu-radio/231384 "2014-08-05T21:18:55Z")
Hey everyone, and all students that have used (or are using) GNU Radio for some purpose. I’m currently working on a presentation on GNU Radio in academic teaching. To get a better understanding of how GNU Radio is us… --- ## [Handling Hier Blocks in Build Process](https://www.ruby-forum.com/t/handling-hier-blocks-in-build-process/231381)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 5, 2014, 8:00pm UTC](https://www.ruby-forum.com/t/handling-hier-blocks-in-build-process/231381 "2014-08-05T20:00:57Z")
I’d like to keep a large number of hier blocks organized in the apps folder (which may not be standard practice for GR). Ideally, I’d like to maintain only the GRC files with version control, but allow the build sys… --- ## [\[coproc\] Co-Processors WG Call on August, 12, 2014](https://www.ruby-forum.com/t/coproc-co-processors-wg-call-on-august-12-2014/231382)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 5, 2014, 7:21pm UTC](https://www.ruby-forum.com/t/coproc-co-processors-wg-call-on-august-12-2014/231382 "2014-08-05T19:21:40Z")
I am scheduling the next Co-Processors WG call to take place on August 12, 2014 @ 2:00pm US/Central time (7:00pm UTC). I’ll send out a reminder next week. Currently there is no agenda, so if you plan on attending and… --- ## [Help on cmake./](https://www.ruby-forum.com/t/help-on-cmake/231364)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 5, 2014, 5:45am UTC](https://www.ruby-forum.com/t/help-on-cmake/231364 "2014-08-05T05:45:36Z")
Hello all I tried to build the following program in Windows 8 command line http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules Using the commands mkdirbuild cd build cmake …/ However, the command c… --- ## [Fwd: gnuradio companion core dump](https://www.ruby-forum.com/t/fwd-gnuradio-companion-core-dump/231348)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 5, 2014, 5:45am UTC](https://www.ruby-forum.com/t/fwd-gnuradio-companion-core-dump/231348 "2014-08-05T05:45:00Z")
Thanks, Martin. I ended up uninstalling Ice3.5 to disable CTRLPORT, then gnuradio make would fail. Ended up completely removing gnuradio and all components (using a gnuradio-remove script) then reinstalled (using th… --- ## [OFDM Blocks](https://www.ruby-forum.com/t/ofdm-blocks/231173)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [August 5, 2014, 3:55am UTC](https://www.ruby-forum.com/t/ofdm-blocks/231173 "2014-08-05T03:55:30Z")
Hello, I’m working with USRP OFDM blocks. I’m confused about how to use built-in OFDM Transmitter and OFDM Receiver blocks. How to set the fields- occupied carriers, pilot carriers, sync word and pilot symbols? … --- ## [GNURadio OOT add custom function](https://www.ruby-forum.com/t/gnuradio-oot-add-custom-function/231322)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 5, 2014, 2:03am UTC](https://www.ruby-forum.com/t/gnuradio-oot-add-custom-function/231322 "2014-08-05T02:03:17Z")
Hello, Recently, I using gr\_modtool to create my own block. I add a c++ block and in the .h file I add a function, but after compile it I cannot call my function in python I just get error message “AttributeError: ‘(… --- ## [Using UDP (Baz)](https://www.ruby-forum.com/t/using-udp-baz/231355)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [August 4, 2014, 9:37pm UTC](https://www.ruby-forum.com/t/using-udp-baz/231355 "2014-08-04T21:37:34Z")
I’m trying to figure out how you would differentiate the blocks you use in the flow graph in gnuradio? How can you tell if a block is (Block 1) or (Block 2) etc.? Marcus --- ## [Using UDP (Baz)](https://www.ruby-forum.com/t/using-udp-baz/231356)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 4, 2014, 8:18pm UTC](https://www.ruby-forum.com/t/using-udp-baz/231356 "2014-08-04T20:18:26Z")
From: discuss-gnuradio-bounces+marcus.ward=removed\_email\_address@domain.invalid \[mailto:discuss-gnuradio-bounces+marcus.ward=removed\_email\_address@domain.invalid\] On Behalf Of Ward, Marcus D. Sent: Monday, August 04, … --- ## [Plotting signal strength](https://www.ruby-forum.com/t/plotting-signal-strength/231353)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 4, 2014, 5:20pm UTC](https://www.ruby-forum.com/t/plotting-signal-strength/231353 "2014-08-04T17:20:35Z")
Hi! I’m trying to plot singnal strength (like s-meter) on the Scope sink from a file recorded by rtl\_sdr. And I’m not getting what I expect, it’s either frequency is off or what is being plotted doesn’t correlate wit… --- ## [Realtime Scheduling Problem](https://www.ruby-forum.com/t/realtime-scheduling-problem/231237)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [August 4, 2014, 1:18pm UTC](https://www.ruby-forum.com/t/realtime-scheduling-problem/231237 "2014-08-04T13:18:49Z")
Dear All, I am running GNU Radio 3.7.3 on a Debian Wheezy System with XFCE Desktop. In the setup I have, a USRP N210 with a SBX daughterboard is used. The USRP samples at 25 MSPS and pretty big processing chain in GN… --- ## [Gnuradio companion core dump](https://www.ruby-forum.com/t/gnuradio-companion-core-dump/231339)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 4, 2014, 11:03am UTC](https://www.ruby-forum.com/t/gnuradio-companion-core-dump/231339 "2014-08-04T11:03:42Z")
I had this problem a couple weeks ago. After deleting the build subdirectory and rebuilding it went away until today when it came back. I deleted the build directory and re-cmake/make/install/ldconfig, but the probl… --- ## [How are parameters of gfsk\_demod block assigned?](https://www.ruby-forum.com/t/how-are-parameters-of-gfsk-demod-block-assigned/231341)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 4, 2014, 4:42am UTC](https://www.ruby-forum.com/t/how-are-parameters-of-gfsk-demod-block-assigned/231341 "2014-08-04T04:42:12Z")
Hi, I recently triy to receive ibeacon signal whose modulation scheme is GFSK, so I use the /gfsk\_demod/ block in gnuradio and succeed to demodulate ibeacon signal. Yet I don’t understand the meaning of some of its … --- ## [USRP N210 for sale](https://www.ruby-forum.com/t/usrp-n210-for-sale/231333)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 3, 2014, 8:10pm UTC](https://www.ruby-forum.com/t/usrp-n210-for-sale/231333 "2014-08-03T20:10:13Z")
Hi, I have my usrp n210 for sale. For €1500 I’m willing to sell it, the gps antenna, a daughter board sbx or wbx included. I’ve also got a gpsdo kit; anything is negotiable. For interest please email at removed\_email… --- ## [Help To Compute Average](https://www.ruby-forum.com/t/help-to-compute-average/231316)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 3, 2014, 7:34pm UTC](https://www.ruby-forum.com/t/help-to-compute-average/231316 "2014-08-03T19:34:46Z")
Hello all I am new to GNUradio software. I would like to compute the average energy and display it in the status message in real time. To achieve this I tried to write a simple Python code attached (Simple2.pyw). How… --- ## [Installing Channel Coding Toolbox on Windows GNURadio](https://www.ruby-forum.com/t/installing-channel-coding-toolbox-on-windows-gnuradio/230736)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [August 3, 2014, 7:43am UTC](https://www.ruby-forum.com/t/installing-channel-coding-toolbox-on-windows-gnuradio/230736 "2014-08-03T07:43:20Z")
Dear all, I am trying to install this toolbox https://www.cgran.org/wiki/chancoding. However, I am working on a windows environment GNU Radio, do anyone tried before or knows how can I get it installed on a GNU Radio… --- ## [AttributeError: 'module' object has no attribute "BLOCK NAME"](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-block-name/231269)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 2, 2014, 10:52pm UTC](https://www.ruby-forum.com/t/attributeerror-module-object-has-no-attribute-block-name/231269 "2014-08-02T22:52:43Z")
Hi at all, I have some problem in running simulation of a block on gnuradio. I have developed a simple block, .cc, .h, .i and .xml file attouched here. All code is compile with success cmake/make/make install/ldconfi… --- ## [Readback IO Signature of Hier Block](https://www.ruby-forum.com/t/readback-io-signature-of-hier-block/231307)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 2, 2014, 6:52pm UTC](https://www.ruby-forum.com/t/readback-io-signature-of-hier-block/231307 "2014-08-02T18:52:31Z")
Is there, or will there ever be a method to read back the io\_signature of a heir block in python? I’d like to do some pythonic stuff to easily wrap multiple hier blocks in a number of separate flowgraphs without req… --- ## [Ofdm\_sync\_sc\_cfb missing square operation in "delay path"](https://www.ruby-forum.com/t/ofdm-sync-sc-cfb-missing-square-operation-in-delay-path/231309)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 2, 2014, 11:08am UTC](https://www.ruby-forum.com/t/ofdm-sync-sc-cfb-missing-square-operation-in-delay-path/231309 "2014-08-02T11:08:02Z")
Hi Martin, I was looking ofdm\_sync\_sc\_cfb block, I found in delay path, “delay\_magsquare” directly connect to “delay\_normalize”, but according S&C’s paper, “delay\_magsquare” need do square operation like “Energy Path… --- ## [Uhd blocks missing](https://www.ruby-forum.com/t/uhd-blocks-missing/231306)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 2, 2014, 2:40am UTC](https://www.ruby-forum.com/t/uhd-blocks-missing/231306 "2014-08-02T02:40:56Z")
Hello, I am using ubuntu 13.10 and I installed gnuradio using the ‘apt-get install gnuradio’ command as described here http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGR I did not experience any errors … --- ## [Usrp\_sink trouble](https://www.ruby-forum.com/t/usrp-sink-trouble/231301)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 1, 2014, 9:11pm UTC](https://www.ruby-forum.com/t/usrp-sink-trouble/231301 "2014-08-01T21:11:36Z")
Hi all, I can’t get the usrp\_sink and usrp\_source blocks to show up in gnu radio. I followed the instructions here: http://code.ettus.com/redmine/ettus/projects/uhd/wiki/UHD\_Linux I installed the Master/Unstable vers… --- ## [Signal Source Frequency](https://www.ruby-forum.com/t/signal-source-frequency/234813)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [August 1, 2014, 9:08pm UTC](https://www.ruby-forum.com/t/signal-source-frequency/234813 "2014-08-01T21:08:27Z")
I am new to GNU Radio. I am working through the new tutorials and am stuck on a concept. I’ve provided a screen shot of my flow diagram. If you look at the triangle signal source, this has a frequency of 100uHz. Yet, … --- ## [Difference between using UDP Sink/Source and UDP Sink/Source (Baz)?](https://www.ruby-forum.com/t/difference-between-using-udp-sink-source-and-udp-sink-source-baz/231298)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 1, 2014, 5:54pm UTC](https://www.ruby-forum.com/t/difference-between-using-udp-sink-source-and-udp-sink-source-baz/231298 "2014-08-01T17:54:39Z")
Hey Everyone, I’m using the regular UDP Sink/Source but currently don’t know the reason for the UDP Sink/Source (Baz). Can anyone help? Thanks in advance, Marcus --- ## [Trouble with RTL-SDR source (Gain Mode?)](https://www.ruby-forum.com/t/trouble-with-rtl-sdr-source-gain-mode/231294)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 1, 2014, 4:05pm UTC](https://www.ruby-forum.com/t/trouble-with-rtl-sdr-source-gain-mode/231294 "2014-08-01T16:05:04Z")
When adding the RTL-SDR source I get the following output: linux; GNU C++ version 4.9.0 20140604 (prerelease); Boost\_105500; UHD\_003.007.001-0-unknown gr-osmosdr 0.1.1 (0.1.1) gnuradio 3.7.4 built-in source types: fi… --- ## [Slow down rate of Python source block](https://www.ruby-forum.com/t/slow-down-rate-of-python-source-block/231277)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [August 1, 2014, 3:32pm UTC](https://www.ruby-forum.com/t/slow-down-rate-of-python-source-block/231277 "2014-08-01T15:32:29Z")
Dear All, I have a Python block that produces packets of size 1536 bytes. Due to various reasons, the latter parts of my flow graph are very slow (this is desired and cannot be changed). After producing 510 packets, I… --- ## [\[GSoC\] Co-Processors Update #8](https://www.ruby-forum.com/t/gsoc-co-processors-update-8/231284)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [August 1, 2014, 7:18am UTC](https://www.ruby-forum.com/t/gsoc-co-processors-update-8/231284 "2014-08-01T07:18:53Z")
Hello all, Logistical: We still need a date for the coproc dev call. Fill this out WhenIsGood: GNURadio Co-processor WG Call GSoC “pencils down” is August 18th or 2.5 weeks from now. Time. Flies. Progress: Last w… --- ## [What do Packet Encoder and Packet Decoder do?](https://www.ruby-forum.com/t/what-do-packet-encoder-and-packet-decoder-do/231249)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [July 31, 2014, 3:28pm UTC](https://www.ruby-forum.com/t/what-do-packet-encoder-and-packet-decoder-do/231249 "2014-07-31T15:28:28Z")
Hi all, Can anyone tell me what do Packet Encoder and Packet Decoder blocks do? and it would be great if you can give me some example :slight\_smile: Thanks in advance Van-Ly Van-Ly Nguyen, Signals and Systems of L… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=57) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=59)