# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=85 [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:** 86 --- ## [BER Rayleigh Simulation](https://www.ruby-forum.com/t/ber-rayleigh-simulation/239726)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 12, 2014, 4:18am UTC](https://www.ruby-forum.com/t/ber-rayleigh-simulation/239726 "2014-03-12T04:18:35Z")
Hello folks, I’m attempting to simulate the BER against EbN0 performance for BPSK under Rayleigh fading channel conditions… I’ve attempted to modify gr-digital/examples/berawgn.py; notably by using channels.fading\_mo… --- ## [FW: output operand requires a reduction, but reduction is not enabled](https://www.ruby-forum.com/t/fw-output-operand-requires-a-reduction-but-reduction-is-not-enabled/239723)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 11, 2014, 11:37pm UTC](https://www.ruby-forum.com/t/fw-output-operand-requires-a-reduction-but-reduction-is-not-enabled/239723 "2014-03-11T23:37:14Z")
From: David Halls Sent: 11 March 2014 16:10 To: Martin B.; removed\_email\_address@domain.invalid Subject: RE: \[Discuss-gnuradio\] output operand requires a reduction, but reduction is not enabled Hi, Yes, the len(ou… --- ## [Flow graph fails when the complexity increased (without USRP device)](https://www.ruby-forum.com/t/flow-graph-fails-when-the-complexity-increased-without-usrp-device/239720)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 11, 2014, 10:15pm UTC](https://www.ruby-forum.com/t/flow-graph-fails-when-the-complexity-increased-without-usrp-device/239720 "2014-03-11T22:15:43Z")
Hi all, I am using GNURADIO 3.7, Ubuntu 13.04 I want to generate dictionary elements using flow graph. dvbt\_dictionary block connects to FFT block it connects to dvbt\_dictionary2 and again after FFT block it connects … --- ## [Get\_tags\_in\_range](https://www.ruby-forum.com/t/get-tags-in-range/239670)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [March 11, 2014, 4:58pm UTC](https://www.ruby-forum.com/t/get-tags-in-range/239670 "2014-03-11T16:58:51Z")
I’m using get\_tags\_in\_range with bounds outside the absolute sample offsets presented in each work function. I’m using this to add end-of-burst tags at offset K-1 for every start-of-burst tag that I find at offset K (… --- ## [GSoC'14: "Read Me" Links](https://www.ruby-forum.com/t/gsoc14-read-me-links/239711)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 11, 2014, 4:00pm UTC](https://www.ruby-forum.com/t/gsoc14-read-me-links/239711 "2014-03-11T16:00:19Z")
To all GSoC’14 potential participants: The application period for GSoC’14 is open (as of Monday, March 10). The deadline for getting your application in is Friday, March 21 @ 19:00 UTC (3 PM/US/ET). I’ve added some … --- ## [How to limit the size of buffer/queue for a block?](https://www.ruby-forum.com/t/how-to-limit-the-size-of-buffer-queue-for-a-block/239710)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 11, 2014, 3:13pm UTC](https://www.ruby-forum.com/t/how-to-limit-the-size-of-buffer-queue-for-a-block/239710 "2014-03-11T15:13:22Z")
Hello The flowgraph of my top\_block has test\_demo as one of the blocks. The work() function associated with it has only one print statement. When I execute the flowgraph, the statement keeps on printing the statement … --- ## [Running GNU Radio on Linux in VMware Workstation](https://www.ruby-forum.com/t/running-gnu-radio-on-linux-in-vmware-workstation/239686)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 11, 2014, 2:30pm UTC](https://www.ruby-forum.com/t/running-gnu-radio-on-linux-in-vmware-workstation/239686 "2014-03-11T14:30:41Z")
I have been working for a week or so on getting GNU Radio going on a Debian Linux platform running inside a VM. GNU Radio is compiled and runs fine. The VM sees my Funcube Pro+ dongle. Using ‘plughw:0,0’ got rid of t… --- ## [WSR14 and Hackfest](https://www.ruby-forum.com/t/wsr14-and-hackfest/239186)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 11, 2014, 1:28pm UTC](https://www.ruby-forum.com/t/wsr14-and-hackfest/239186 "2014-03-11T13:28:27Z")
Hi, for anyone who wants to meet up with fellow SDR devs, the 8th Karlsruhe Workshop on Software Radio will be held March 12/13, here in Karlsruhe, Germany. The program can be found here \[0\]. After the workshop we’ll… --- ## [Proposal for GSoC on gr-gsm](https://www.ruby-forum.com/t/proposal-for-gsoc-on-gr-gsm/239700)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [March 11, 2014, 10:19am UTC](https://www.ruby-forum.com/t/proposal-for-gsoc-on-gr-gsm/239700 "2014-03-11T10:19:28Z")
Hi all, As Martin B. noticed in the mail list yesterday, I haven’t open my proposal here. Here is the link: If you have any suggestions, please don’t be hesitate to contact me. Thanks to Sylvain M. for his help on … --- ## [Should return the number of input or the number of output?](https://www.ruby-forum.com/t/should-return-the-number-of-input-or-the-number-of-output/239652)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [March 11, 2014, 10:17am UTC](https://www.ruby-forum.com/t/should-return-the-number-of-input-or-the-number-of-output/239652 "2014-03-11T10:17:02Z")
Dear Sir, A python sink block created by gr\_modtool has below work() function, it returns the number of input items. def work(self, input\_items, output\_items): in0 = input\_items\[0\] # \<+signal processing here+\> … --- ## [Pybombs make error](https://www.ruby-forum.com/t/pybombs-make-error/239702)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 11, 2014, 10:12am UTC](https://www.ruby-forum.com/t/pybombs-make-error/239702 "2014-03-11T10:12:46Z")
hi, I am trying to install GNU Radio through PyBombs in Ubuntu 12.04. I get the following error, \[ 21%\] Built target pygen\_gr\_uhd\_examples\_python\_d7761 \[ 21%\] Built target \_pmt\_swig\_doc\_tag Scanning dependencies of… --- ## [Python block, itemsize mismatch](https://www.ruby-forum.com/t/python-block-itemsize-mismatch/239690)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [March 11, 2014, 2:07am UTC](https://www.ruby-forum.com/t/python-block-itemsize-mismatch/239690 "2014-03-11T02:07:59Z")
Hi, I get the following error connecting ‘OFDM Serializer’ (GNU Radio block with complex output), to my own Python block ‘blsd\_dec\_bfb’ (with complex input) “ValueError: itemsize mismatch: ofdm\_serializer\_vcc0:0 usin… --- ## [Request for LTE record file](https://www.ruby-forum.com/t/request-for-lte-record-file/239616)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 10, 2014, 11:55pm UTC](https://www.ruby-forum.com/t/request-for-lte-record-file/239616 "2014-03-10T23:55:29Z")
Hi everybody, I just installed gr-lte with the Pybombs script. I get an error when I launch the flowgraph with one of my record file. Does anybody have a downlink file I could work with ? Thanks Winston Sent using … --- ## [Sending text command from TransceiverA to transceiverB](https://www.ruby-forum.com/t/sending-text-command-from-transceivera-to-transceiverb/239693)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 10, 2014, 10:40pm UTC](https://www.ruby-forum.com/t/sending-text-command-from-transceivera-to-transceiverb/239693 "2014-03-10T22:40:03Z")
Hi GR, I have two transceivers running on two machines (TransceiverA flowgraph and TransceiverB flowgraph) and I want at some point in time send a text command from transceiver A containing the value of a parameter … --- ## [File source and seek()](https://www.ruby-forum.com/t/file-source-and-seek/239688)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 10, 2014, 10:38pm UTC](https://www.ruby-forum.com/t/file-source-and-seek/239688 "2014-03-10T22:38:14Z")
Hello, I am having some trouble getting the seek() function in the file source to work. My program has a non-repeating file source, and a GUI button with the callback function set\_button(). In the callback I have wr… --- ## [Trouble building uhd-3.6.2 for the zedboard](https://www.ruby-forum.com/t/trouble-building-uhd-3-6-2-for-the-zedboard/239695)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 10, 2014, 7:57pm UTC](https://www.ruby-forum.com/t/trouble-building-uhd-3-6-2-for-the-zedboard/239695 "2014-03-10T19:57:52Z")
Hello, I am attempting to use GNU radio with a ZedBoard by following the tutorial here: http://gnuradio.org/redmine/projects/gnuradio/wiki/Zynq While using bitbake to create an OS to run on the board, I get an error… --- ## [GSoc 14- MIMO](https://www.ruby-forum.com/t/gsoc-14-mimo/239683)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 10, 2014, 2:54pm UTC](https://www.ruby-forum.com/t/gsoc-14-mimo/239683 "2014-03-10T14:54:31Z")
Hello All, Do we have any information about how much work have been done in MIMO? So we can utilize those code for our GSoC project. Will there be any compatibility issues for new versions of GNU radio? Thanks and r… --- ## [GSoC: Multiple students working on an idea](https://www.ruby-forum.com/t/gsoc-multiple-students-working-on-an-idea/239662)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [March 10, 2014, 2:03pm UTC](https://www.ruby-forum.com/t/gsoc-multiple-students-working-on-an-idea/239662 "2014-03-10T14:03:20Z")
Hi GNU Radio discussers, I’m the mentor for the signal analysis tool on the GNU Radio GSoC ideas page. I was contacted by two students interested in working on the project. They know each other, go to the same school,… --- ## [How to change to digest format?](https://www.ruby-forum.com/t/how-to-change-to-digest-format/239601)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 10, 2014, 11:59am UTC](https://www.ruby-forum.com/t/how-to-change-to-digest-format/239601 "2014-03-10T11:59:34Z")
Hi, I just subscribed to GNURadio. I am getting each post as a seperate email. How do I change to digest format? On the signup sheet, I do not see a place to log in (with user/pswd) so that things can be changed. T… --- ## [\[GSoC\] Applications](https://www.ruby-forum.com/t/gsoc-applications/239678)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 10, 2014, 11:15am UTC](https://www.ruby-forum.com/t/gsoc-applications/239678 "2014-03-10T11:15:00Z")
In ~9 hrs, the student application for GSoC opens. So far, I have not seen a single draft of a proposal from potential applicants. This is not necessarily a big problem, since you can upload your proposal straight to … --- ## [Compile with eigen](https://www.ruby-forum.com/t/compile-with-eigen/239671)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 10, 2014, 10:59am UTC](https://www.ruby-forum.com/t/compile-with-eigen/239671 "2014-03-10T10:59:09Z")
hi ,all i write a block whit eigen library,and what should i do when to compile with this library,such as add something in the Cmakelist.txt or Makefile , i’m sorry ,i donot familiar with this thanks, BZS --- ## [FM radio station](https://www.ruby-forum.com/t/fm-radio-station/239676)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 10, 2014, 10:37am UTC](https://www.ruby-forum.com/t/fm-radio-station/239676 "2014-03-10T10:37:53Z")
I have an USRP1, basic Tx, basic Rx, power amplifire(ZHL-3A-s+)and low noise amp(ZFL-1000LN+)and two VERT400 Antenna(Includes one VERT400 144 MHz, 400 MHz, and 1200 MHz Tri-band omni-directional vertical antenna) so i… --- ## [What does noutput mean in a FFT block whic fft\_len=2048?](https://www.ruby-forum.com/t/what-does-noutput-mean-in-a-fft-block-whic-fft-len-2048/239669)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 10, 2014, 9:04am UTC](https://www.ruby-forum.com/t/what-does-noutput-mean-in-a-fft-block-whic-fft-len-2048/239669 "2014-03-10T09:04:41Z")
hi, i want deal the data after FFT in my own block,i copy a fft\_lensizeof(gr\_complex) length of data from in to a buffer,then deal the data ,and copy the dealed data from buffer to the out, in a FFT blocks,if ther… --- ## [GSoC14 participation](https://www.ruby-forum.com/t/gsoc14-participation/239659)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 9, 2014, 12:53pm UTC](https://www.ruby-forum.com/t/gsoc14-participation/239659 "2014-03-09T12:53:31Z")
Hello, For GSoC-14 , what is minimum and maximum number of students can be part of one team? Thanks and regards, Kunal --- ## [Re: use of gr-specest for direction finding of a 1X2 MIMO system](https://www.ruby-forum.com/t/re-use-of-gr-specest-for-direction-finding-of-a-1x2-mimo-system/239661)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 9, 2014, 12:50pm UTC](https://www.ruby-forum.com/t/re-use-of-gr-specest-for-direction-finding-of-a-1x2-mimo-system/239661 "2014-03-09T12:50:28Z")
hello, I downloaded and build gr-specest block from github site " GitHub - kit-cel/gr-specest: A module adding spectral estimation routines to GNU Radio." into gnu radio 3.6.5.1, But while make test i got the followi… --- ## [Use of gr-specest](https://www.ruby-forum.com/t/use-of-gr-specest/239650)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 9, 2014, 9:08am UTC](https://www.ruby-forum.com/t/use-of-gr-specest/239650 "2014-03-09T09:08:19Z")
can the gr-specest be used to implement root music algorithm for direction finding?? --- ## [How to use measurement tool](https://www.ruby-forum.com/t/how-to-use-measurement-tool/239654)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 9, 2014, 6:37am UTC](https://www.ruby-forum.com/t/how-to-use-measurement-tool/239654 "2014-03-09T06:37:31Z")
Good morning… i have a question ..how to use the measurement tool, which are in gnuradio-companion library?. please explain step if possible i want to use signal probe and average message ^2 block… – T… --- ## [Selling my USRP N210](https://www.ruby-forum.com/t/selling-my-usrp-n210/239648)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [March 9, 2014, 3:19am UTC](https://www.ruby-forum.com/t/selling-my-usrp-n210/239648 "2014-03-09T03:19:05Z")
I am selling a USRP N210 on ebay if anyone is interested. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=231176499079 --- ## [Implementation of root music algo](https://www.ruby-forum.com/t/implementation-of-root-music-algo/239642)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 8, 2014, 8:24pm UTC](https://www.ruby-forum.com/t/implementation-of-root-music-algo/239642 "2014-03-08T20:24:44Z")
i was trying to implement root-music algorithm for basic 1X2 MIMO system. I have made block for it but its not giving proper result. Has any one implemented it so that i could use it as reference to solve the issue in … --- ## [Self.set\_min\_noutput\_items() is not a valid python command in gnuradio?](https://www.ruby-forum.com/t/self-set-min-noutput-items-is-not-a-valid-python-command-in-gnuradio/239596)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 16\ **Last updated:** [March 8, 2014, 3:44pm UTC](https://www.ruby-forum.com/t/self-set-min-noutput-items-is-not-a-valid-python-command-in-gnuradio/239596 "2014-03-08T15:44:46Z")
Dear Sir, In c++ we have: set\_min\_noutput\_items() What is it equivalent syntax in python ? I try this: self.set\_min\_noutput\_items() Error message: AttributeError: ‘quadrator\_upconverter\_python1’ object has no att… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=84) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=86)