# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=48 [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:** 49 --- ## [Problem with 'logpwrfft' Block](https://www.ruby-forum.com/t/problem-with-logpwrfft-block/232681)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 22, 2014, 8:30am UTC](https://www.ruby-forum.com/t/problem-with-logpwrfft-block/232681 "2014-10-22T08:30:42Z")
Hi, I’ve got a problem with the logpwrfft block. I’m using a RTL-SDR with a Raspberry Pi as streaming server. On my computer I’m receiving the samples with GNU Radio over network. I then want to calculate the spectru… --- ## [Satellite UHF Beacon Decoder](https://www.ruby-forum.com/t/satellite-uhf-beacon-decoder/232670)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 21, 2014, 9:09pm UTC](https://www.ruby-forum.com/t/satellite-uhf-beacon-decoder/232670 "2014-10-21T21:09:28Z")
I am working on creating a cubesat satellite beacon decoder using the Ettus B200 SDR. I think I have a pretty good handle on the signal conditioning and the demodulation (see picture of waveform and block diagram). Ho… --- ## [Memory allocation issue](https://www.ruby-forum.com/t/memory-allocation-issue/232667)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [October 21, 2014, 7:40pm UTC](https://www.ruby-forum.com/t/memory-allocation-issue/232667 "2014-10-21T19:40:23Z")
I’m writing a block that requires a large amount of data to be processed in one iteration of the work function. If I call set\_output\_multiple() with 8100 \* 130 = 1053000 items (of gr\_complex), I get the following erro… --- ## [GNU Radio 3.7.5.1 and live DVD released](https://www.ruby-forum.com/t/gnu-radio-3-7-5-1-and-live-dvd-released/232669)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 21, 2014, 6:44pm UTC](https://www.ruby-forum.com/t/gnu-radio-3-7-5-1-and-live-dvd-released/232669 "2014-10-21T18:44:25Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: Looking for 802.11 MAC & PHY Package](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [October 21, 2014, 8:33am UTC](https://www.ruby-forum.com/t/re-looking-for-802-11-mac-phy-package/232464 "2014-10-21T08:33:10Z")
Dear Marcus and Bloessl, Thanks for the reply. I also notice the fully functional gr-ieee802-11 package provide by Bloessl. Previously I thought it’s only PHY, but as Marcus mentioned it also include MAC. It seems to … --- ## [Import block](https://www.ruby-forum.com/t/import-block/232651)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [October 20, 2014, 5:51pm UTC](https://www.ruby-forum.com/t/import-block/232651 "2014-10-20T17:51:14Z")
Hi, I am a new user of GNURadio and I am interested in use the Import block, to import the PSK.PY file, according to a tutorial that I am reading. The problem is that file doesn’ t exists in the file sytem of my GNU… --- ## [Writing a Radio Driver](https://www.ruby-forum.com/t/writing-a-radio-driver/232587)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [October 20, 2014, 2:19pm UTC](https://www.ruby-forum.com/t/writing-a-radio-driver/232587 "2014-10-20T14:19:55Z")
Hello Everyone, I have a custom PCB to power an SDR, and I’m going to need to provide a gnuradio driver for it. We are using: Xilinx Zynq 7020 SoC Analog Devices AD9364 ADC AvNet ZedBoard for prototyping I can only… --- ## [TX/RX with USRPN200 and GNURadio](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [October 20, 2014, 1:51pm UTC](https://www.ruby-forum.com/t/tx-rx-with-usrpn200-and-gnuradio/232603 "2014-10-20T13:51:56Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Exports in \_runtime\_swig.pyd](https://www.ruby-forum.com/t/exports-in-runtime-swig-pyd/232630)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 19, 2014, 3:15pm UTC](https://www.ruby-forum.com/t/exports-in-runtime-swig-pyd/232630 "2014-10-19T15:15:39Z")
I’m still trying to understand the build-process and internals of GnuRadio. While trying to build the Swig .pyd modules, I notice that gnuradio-runtime/swig/runtime\_swig.i has a: #define GR\_RUNTIME\_API Thus functions… --- ## [Pybombs error](https://www.ruby-forum.com/t/pybombs-error/232596)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [October 19, 2014, 12:49am UTC](https://www.ruby-forum.com/t/pybombs-error/232596 "2014-10-19T00:49:07Z")
Hello guys, I still trying to install GNURadio on debian 7.6 i86, but there is a problem with installing ‘pyqwt5’ package with pybombs! The following error is appeared: packages to install: \[‘pyqwt5’, ‘mcpp’, ‘db48’… --- ## [NC-OFDM and Cross sub-carrier Interference](https://www.ruby-forum.com/t/nc-ofdm-and-cross-sub-carrier-interference/232609)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 18, 2014, 11:24am UTC](https://www.ruby-forum.com/t/nc-ofdm-and-cross-sub-carrier-interference/232609 "2014-10-18T11:24:55Z")
Hi, I’m currently developing a testbed for spectrum aggregation and fragmentation using GNURadio and USRPs (B200s and B210s). My approach is to emulate aggregation and fragmentation using Non-Contiguous OFDM: Theore… --- ## [\[coproc\] Next WG Call Time](https://www.ruby-forum.com/t/coproc-next-wg-call-time/232610)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 17, 2014, 11:04pm UTC](https://www.ruby-forum.com/t/coproc-next-wg-call-time/232610 "2014-10-17T23:04:03Z")
I’d like to setup another Co-Processors WG call in the next couple of weeks any one interested in attending should vote on the date/time at: WhenIsGood: GNURadio CoProcessor WG Call Somewhere in the Oct. 27 - 31 da… --- ## [Gettin data out from GRC to C++ or java?](https://www.ruby-forum.com/t/gettin-data-out-from-grc-to-c-or-java/232565)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [October 17, 2014, 10:08pm UTC](https://www.ruby-forum.com/t/gettin-data-out-from-grc-to-c-or-java/232565 "2014-10-17T22:08:05Z")
Greeting, After building up some strong Matlab’s prototype of my 802.11 receiver, I have to make really big and complicated GUI with lot of button’s, plots, different tabs etc. And my question is simple: Any way to… --- ## [Re: Source Block - Flow Control](https://www.ruby-forum.com/t/re-source-block-flow-control/232591)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [October 17, 2014, 9:08pm UTC](https://www.ruby-forum.com/t/re-source-block-flow-control/232591 "2014-10-17T21:08:34Z")
\-------- Original message -------- From: Matt E. Date:2014/10/16 22:42 (GMT+00:00) To: John M. Cc: David Halls ,GNURadio Subject: Re: \[Discuss-gnuradio\] Source Block - Flow Control On Thu, Oct 16, 2014 at 8:40 AM, … --- ## [High Flowgraph Latency in 3.6.4.1](https://www.ruby-forum.com/t/high-flowgraph-latency-in-3-6-4-1/232466)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 14\ **Last updated:** [October 17, 2014, 7:35pm UTC](https://www.ruby-forum.com/t/high-flowgraph-latency-in-3-6-4-1/232466 "2014-10-17T19:35:07Z")
I thought I would join the list of people emailing the list this week about obscure issues with ancient versions of GNU Radio. I have a flow graph that needs to operate at a variety of datarates from a few kbps to a… --- ## [Help accessing fft bins in python script](https://www.ruby-forum.com/t/help-accessing-fft-bins-in-python-script/232586)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [October 17, 2014, 6:03pm UTC](https://www.ruby-forum.com/t/help-accessing-fft-bins-in-python-script/232586 "2014-10-17T18:03:22Z")
Using qa\_fft.py for inspiration\[1\], I’m trying to feed a raw capture file into an fft of size 32 and then review the 32 fft bins at an instantaneous point in time\[2\]. I must be doing something wrong however because wh… --- ## [A BERT Block with Offset Compensation](https://www.ruby-forum.com/t/a-bert-block-with-offset-compensation/232485)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [October 17, 2014, 7:59am UTC](https://www.ruby-forum.com/t/a-bert-block-with-offset-compensation/232485 "2014-10-17T07:59:53Z")
I am working on a GR block that will test two incoming bit streams (one a reference and one a received result) for equality and return the estimated BER. Blocks already exist that do this, but they assume the stream… --- ## [Source Block - Flow Control](https://www.ruby-forum.com/t/source-block-flow-control/232529)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 19\ **Last updated:** [October 16, 2014, 11:44pm UTC](https://www.ruby-forum.com/t/source-block-flow-control/232529 "2014-10-16T23:44:11Z")
Dear All, I am wondering how to add some flow control to a source block, so that it doesn’t fire out items so quickly. Later stages of my flow graph are slowed by various bits of processing and combining, before tran… --- ## [Confusion about delay block](https://www.ruby-forum.com/t/confusion-about-delay-block/232590)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 16, 2014, 10:26pm UTC](https://www.ruby-forum.com/t/confusion-about-delay-block/232590 "2014-10-16T22:26:12Z")
Hi all, A little while back I submitted an issue (http://gnuradio.org/redmine/issues/693) regarding the inability to instantiate the delay block with a negative int (to consume samples) despite the code comments and … --- ## [Is there possible to have item drops?](https://www.ruby-forum.com/t/is-there-possible-to-have-item-drops/232544)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [October 16, 2014, 10:26pm UTC](https://www.ruby-forum.com/t/is-there-possible-to-have-item-drops/232544 "2014-10-16T22:26:12Z")
Hi all, It seems this is a ridiculous question, however, I didn’t find any solution for my problem. I have already a bunch of custom blocks connected to each other which play role as a transmitter (tx). I want to c… --- ## [Dev Call October](https://www.ruby-forum.com/t/dev-call-october/232584)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 16, 2014, 7:19pm UTC](https://www.ruby-forum.com/t/dev-call-october/232584 "2014-10-16T19:19:50Z")
Hey Everyone, since we haven’t had a call in 2 months, here’s a reminder. The call is going on now, if you want to join, ping me in IRC (mbr0wn). We’ll put out the video link ASAP for those who just want to watch it. … --- ## [Regarding lock protection when setting private variables in gnuradio blocks](https://www.ruby-forum.com/t/regarding-lock-protection-when-setting-private-variables-in-gnuradio-blocks/234837)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 8\ **Last updated:** [October 16, 2014, 7:01pm UTC](https://www.ruby-forum.com/t/regarding-lock-protection-when-setting-private-variables-in-gnuradio-blocks/234837 "2014-10-16T19:01:22Z")
My question arose from a comment that Jonathan made on one of the pull requests in gnuradio (#293). If we have a set function in a gr block that sets some private variable that is used in the work function, do we ne… --- ## [Block taking in message, outputting items](https://www.ruby-forum.com/t/block-taking-in-message-outputting-items/232582)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 16, 2014, 5:38pm UTC](https://www.ruby-forum.com/t/block-taking-in-message-outputting-items/232582 "2014-10-16T17:38:38Z")
Dear All, How can I create a block like ‘Random PDU Generator’, but that outputs items rather than PDUs over a message port? Hopefully its easy but I am not clear if I need a work function or not, and if I don’t have… --- ## [MSVC v16 'static const' error](https://www.ruby-forum.com/t/msvc-v16-static-const-error/232547)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 16, 2014, 4:01pm UTC](https://www.ruby-forum.com/t/msvc-v16-static-const-error/232547 "2014-10-16T16:01:00Z")
I just got this error from MSVC v16 while trying to compile atsc\_sync\_impl.cc: g:\\gv\\dx-radio\\gnuradio-3.x\\gr-dtv\\lib\\atsc\\atsc\_sync\_impl.h(37) : error C2864: ‘gr::dtv::atsc\_sync\_impl::LOOP\_FILTER\_TAP’ : only static … --- ## [Get a pointer to UHD Sink from other block in flow graph](https://www.ruby-forum.com/t/get-a-pointer-to-uhd-sink-from-other-block-in-flow-graph/232573)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [October 16, 2014, 2:59pm UTC](https://www.ruby-forum.com/t/get-a-pointer-to-uhd-sink-from-other-block-in-flow-graph/232573 "2014-10-16T14:59:03Z")
Hi All, Is there any way to get a pointer to a UHD sink block from another block in a flow graph, such that I can read from the time registers of a USRP? Regards, David David Halls Ph.D. Research Engineer Toshiba… --- ## [Grc connection issue?](https://www.ruby-forum.com/t/grc-connection-issue/232566)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 16, 2014, 11:56am UTC](https://www.ruby-forum.com/t/grc-connection-issue/232566 "2014-10-16T11:56:17Z")
Hi list, I have a custom block trying to connect with other blocks in gnuradio like: for i in xrange(len(self.sources)): self.connect(self.src\[i\], self.filt\[i\], self.resampler\[i\], (self.finder, i)) number of connec… --- ## [Obtain rx\_time (to create tx\_time) in a tx flow graph with USRP](https://www.ruby-forum.com/t/obtain-rx-time-to-create-tx-time-in-a-tx-flow-graph-with-usrp/232555)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 15, 2014, 11:47pm UTC](https://www.ruby-forum.com/t/obtain-rx-time-to-create-tx-time-in-a-tx-flow-graph-with-usrp/232555 "2014-10-15T23:47:05Z")
Hi guys, I think I have said it all in the title, any ideas how I can get create tx\_time in a transmit flow graph with a USRP UHD sink? I know that UHD source spits out rx\_time, but I don’t have a UHD source in my flo… --- ## [QT GUI frequency plot scale](https://www.ruby-forum.com/t/qt-gui-frequency-plot-scale/232530)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 15, 2014, 1:14am UTC](https://www.ruby-forum.com/t/qt-gui-frequency-plot-scale/232530 "2014-10-15T01:14:04Z")
Hi all, I’m going through some of the GNU Radio tutorials and I noticed that the frequency axis for the QT GUI frequency sink is incorrect for real valued signals (e.g., sample rate of 10k shows -2.5k to 2.5k). I fou… --- ## [Flow graph stops after 45/60 minutes (was: Re: Discuss-gnuradio Digest, Vol 142, Issue 15)](https://www.ruby-forum.com/t/flow-graph-stops-after-45-60-minutes-was-re-discuss-gnuradio-digest-vol-142-issue-15/232528)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [October 14, 2014, 7:39pm UTC](https://www.ruby-forum.com/t/flow-graph-stops-after-45-60-minutes-was-re-discuss-gnuradio-digest-vol-142-issue-15/232528 "2014-10-14T19:39:03Z")
Hi Dominique, please, please, please, don’t respond to digests, leaving the subject line unchanged; it’s completely impossible to match mails to conversations without searching one’s inbox. (it’s also in the first li… --- ## [Qt versions & libQt5Svg.so.5](https://www.ruby-forum.com/t/qt-versions-libqt5svg-so-5/232510)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [October 14, 2014, 6:30pm UTC](https://www.ruby-forum.com/t/qt-versions-libqt5svg-so-5/232510 "2014-10-14T18:30:01Z")
Building gnuradio 3.7.5 from git repo on Ubuntu 13.10 is fine except qa-qtgui test fails, with unfound libQt5Svg.so.5. Making links from /usr/lib to either libQt5Svg.so.5.3.2 or libQt5Svg.so.5.3.1 finds the lib but bo… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=47) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=49)