# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=20 [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:** 21 --- ## [Re: Integration of python's time.time() and work() calls](https://www.ruby-forum.com/t/re-integration-of-pythons-time-time-and-work-calls/242134)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 29, 2015, 9:39pm UTC](https://www.ruby-forum.com/t/re-integration-of-pythons-time-time-and-work-calls/242134 "2015-05-29T21:39:34Z")
Hi Marcus, Thanks for the explanation, it is very clear. But is there a way to keep track of time elapsed across consecutive work calls? Like I said in the first post in this thread, if I have a sliding window base… --- ## [Wire format: using 8-bit (sc8) vs using 16-bit (sc16) resolution to gnu radio](https://www.ruby-forum.com/t/wire-format-using-8-bit-sc8-vs-using-16-bit-sc16-resolution-to-gnu-radio/242132)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 29, 2015, 7:59pm UTC](https://www.ruby-forum.com/t/wire-format-using-8-bit-sc8-vs-using-16-bit-sc16-resolution-to-gnu-radio/242132 "2015-05-29T19:59:05Z")
Hi, i am using usrp N200 and i set to gnu radio the wire format as either 16-bit -\> sc16 or 8-bit -\>sc8 and host format fc32(complex float) when i use a) sc16 the power in the window where i see the spectrum is at -1… --- ## [GRC Reacting Slowly](https://www.ruby-forum.com/t/grc-reacting-slowly/242099)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [May 29, 2015, 4:40pm UTC](https://www.ruby-forum.com/t/grc-reacting-slowly/242099 "2015-05-29T16:40:27Z")
GNU Radio 3.7.8, Ubuntu 14.04 I have an admittedly large number of blocks in my current flow graph because I’m in the middle of some hardcore debugging. Every time I select a block to enable/disable it, there is a \> … --- ## [Can't install gnuradio 3.7.7.1 and newest UHD](https://www.ruby-forum.com/t/cant-install-gnuradio-3-7-7-1-and-newest-uhd/242127)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 29, 2015, 1:19pm UTC](https://www.ruby-forum.com/t/cant-install-gnuradio-3-7-7-1-and-newest-uhd/242127 "2015-05-29T13:19:25Z")
Hi all, I am stil using gnuradio 3.6.5.1 and yesterday I wanted to install newest version of both gnuradio and UHD driver. I wanted to install them on some different path and to preserve working environment until I … --- ## [Modtool noblock and xml files and grc](https://www.ruby-forum.com/t/modtool-noblock-and-xml-files-and-grc/242117)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 29, 2015, 11:27am UTC](https://www.ruby-forum.com/t/modtool-noblock-and-xml-files-and-grc/242117 "2015-05-29T11:27:47Z")
Hello again, I tried to add a C++ noblock to my OOT module. In this particular case I wanted to provide a reusable “n of m” counter class (for non-signal stuff to count) in C++ code that I could use within various C+… --- ## [Re: Integration of python's time.time() and work() calls](https://www.ruby-forum.com/t/re-integration-of-pythons-time-time-and-work-calls/242125)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 29, 2015, 10:08am UTC](https://www.ruby-forum.com/t/re-integration-of-pythons-time-time-and-work-calls/242125 "2015-05-29T10:08:18Z")
Or is there a way to make sure that the in-buffer gets updated multiple times within the same work call? Will placing the work function inside a while 1 do the trick? But I guess the issue with that is, as long a… --- ## [Spectral survey with USRP and GRC](https://www.ruby-forum.com/t/spectral-survey-with-usrp-and-grc/242123)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 29, 2015, 2:23am UTC](https://www.ruby-forum.com/t/spectral-survey-with-usrp-and-grc/242123 "2015-05-29T02:23:42Z")
Hello, I am trying to make a simple spectral survey with a USRP and GRC. I want to create a flowgraph that runs for a fixed number of iterations. In each iteration, I need to set a new center frequency in the uhd sour… --- ## [GNU Radio Installation](https://www.ruby-forum.com/t/gnu-radio-installation/242122)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 29, 2015, 2:10am UTC](https://www.ruby-forum.com/t/gnu-radio-installation/242122 "2015-05-29T02:10:51Z")
I’m installing gnuradio again on my ubuntu 14.04 installed in VMware 11.1.0. I tried it several times, but I can’t seem to pass this step: Fetching various packages (Gnu Radio, UHD, gr-osmosdr, gr-iqbal, etc) via the … --- ## [Software Defined Academy Programme almost ready](https://www.ruby-forum.com/t/software-defined-academy-programme-almost-ready/242067)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [May 28, 2015, 11:57pm UTC](https://www.ruby-forum.com/t/software-defined-academy-programme-almost-ready/242067 "2015-05-28T23:57:36Z")
Dear List, the programme of the Software Defined Radio Academy on June 27 2015 in Friedrichshafen (sub-conference to HAMRADIO) is almost complete. But it is already now so interesting that I don’t want to wait any lon… --- ## [Fast, Single-Sample Phase Rotation](https://www.ruby-forum.com/t/fast-single-sample-phase-rotation/242102)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [May 28, 2015, 11:51pm UTC](https://www.ruby-forum.com/t/fast-single-sample-phase-rotation/242102 "2015-05-28T23:51:45Z")
I have a complex phase rotation function that uses a pre-generated sin/cos LUT and some basic multiple/adds. As it turns out, the rotation calc, which uses “straight” C/C++ math is still the bottleneck in a demod. I… --- ## [Fwd: modtool noblock and xml files and grc](https://www.ruby-forum.com/t/fwd-modtool-noblock-and-xml-files-and-grc/242116)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 28, 2015, 5:47pm UTC](https://www.ruby-forum.com/t/fwd-modtool-noblock-and-xml-files-and-grc/242116 "2015-05-28T17:47:02Z")
On Thu, May 28, 2015 at 8:26 AM, John M. \< removed\_email\_address@domain.invalid\> wrote: Anyhow, it unexpectedly generated an xml file to import the non-block into GRC. Is there a best way to just remove that xml fil… --- ## [GRAndPy](https://www.ruby-forum.com/t/grandpy/242115)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 28, 2015, 5:17pm UTC](https://www.ruby-forum.com/t/grandpy/242115 "2015-05-28T17:17:47Z")
There are a few implementations of python for android, at least one of which appears to be a proper implementation, Google Code Archive - Long-term storage for Google Code Project Hosting. . I was looking at portin… --- ## [Is file sink block resetting USRP?](https://www.ruby-forum.com/t/is-file-sink-block-resetting-usrp/242107)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 28, 2015, 2:28pm UTC](https://www.ruby-forum.com/t/is-file-sink-block-resetting-usrp/242107 "2015-05-28T14:28:17Z")
Hi all, I use a file sink block in my flow graph to record samples from a USRP N210. I start the flow graph and then after some time starts to record using the file sink block by switching it on using a selector block… --- ## [Bfile sink base undefined symbol error](https://www.ruby-forum.com/t/bfile-sink-base-undefined-symbol-error/242113)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 28, 2015, 1:25pm UTC](https://www.ruby-forum.com/t/bfile-sink-base-undefined-symbol-error/242113 "2015-05-28T13:25:09Z")
Hi all guys, I encounter following error when running my test: ImportError: /usr/local/lib/libgnuradio-TPMS.so: undefined symbol: \_ZN2gr6blocks14file\_sink\_baseC2EPKcb There was a similar problem explained here: I u… --- ## [ESA SOCIS project Announcement](https://www.ruby-forum.com/t/esa-socis-project-announcement/242112)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 28, 2015, 12:44pm UTC](https://www.ruby-forum.com/t/esa-socis-project-announcement/242112 "2015-05-28T12:44:49Z")
Hey GNU Radio community! Thanks for choosing my project for this year’s ESA Summer of Code in Space. I will implement a POLAR code encoder decoder chain as well as channel construction. I would like to introduce myse… --- ## [Error using Packet Encoder --\> Packet Decoder](https://www.ruby-forum.com/t/error-using-packet-encoder-packet-decoder/242059)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 28, 2015, 1:22am UTC](https://www.ruby-forum.com/t/error-using-packet-encoder-packet-decoder/242059 "2015-05-28T01:22:13Z")
Hello everyone, I want to simulate file transmission using BPSK modulation, with block diagram File Source --\> Packet Encoder --\> BPSK Mod --\> BPSK Demod --\> Packet Decoder --\> File Sink But the result is 0 kB. Then… --- ## [Is it possible to create a block from other blocks?](https://www.ruby-forum.com/t/is-it-possible-to-create-a-block-from-other-blocks/242097)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [May 27, 2015, 11:44pm UTC](https://www.ruby-forum.com/t/is-it-possible-to-create-a-block-from-other-blocks/242097 "2015-05-27T23:44:36Z")
Hi all, I wonder if there is a similar feature in grc as in Simulink where one can create a block from other blocks? (Select the blocks, right click and merge into one) Or how do you do more complicated flow graphs … --- ## [Integration of python's time.time() and work() calls](https://www.ruby-forum.com/t/integration-of-pythons-time-time-and-work-calls/242106)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 27, 2015, 7:47pm UTC](https://www.ruby-forum.com/t/integration-of-pythons-time-time-and-work-calls/242106 "2015-05-27T19:47:19Z")
Hi I’m writing a custom block in python. The application goes like this: I specify the minimum number of samples I need by using the forecast function. This ensures that I have that many samples available in the in-b… --- ## [Choose thread](https://www.ruby-forum.com/t/choose-thread/242050)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [May 27, 2015, 7:27pm UTC](https://www.ruby-forum.com/t/choose-thread/242050 "2015-05-27T19:27:27Z")
Hi, I’ve a question about thread management…I like the fact that scheduler can launch blocks in different threads, but I’d like to execute some blocks inside the same thread(CUDA require to perform all operations fro… --- ## [Buffer Overflow Debug](https://www.ruby-forum.com/t/buffer-overflow-debug/241951)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [May 27, 2015, 6:03pm UTC](https://www.ruby-forum.com/t/buffer-overflow-debug/241951 "2015-05-27T18:03:18Z")
Hi all, I’m working on an incredibly annoying issue related to my use of the Header/Payload Demux (HPD) block. I think it’s related to a buffer overflow at some point, but I’m having a really hard time coming up with… --- ## [Does the message port propagate tags?](https://www.ruby-forum.com/t/does-the-message-port-propagate-tags/242096)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 26, 2015, 10:18pm UTC](https://www.ruby-forum.com/t/does-the-message-port-propagate-tags/242096 "2015-05-26T22:18:38Z")
Hi all, I’ve been wondering if a message port propagate the tag that come from a previous input ports. I’ve been reading about propagation and propagation politics and I was just playing around putting a Tag debug in… --- ## [Gr-osmosdr airspy compiling error](https://www.ruby-forum.com/t/gr-osmosdr-airspy-compiling-error/242098)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 26, 2015, 9:43pm UTC](https://www.ruby-forum.com/t/gr-osmosdr-airspy-compiling-error/242098 "2015-05-26T21:43:34Z")
Hi, i try to install gnuradio and some apps with pybombs and app\_store. When i want install and build gr-osmosdr i get the following error message: \[ 2%\] Building CXX object lib/CMakeFiles/gnuradio-osmosdr.dir/airs… --- ## [Question about reverse-engineering a new mode](https://www.ruby-forum.com/t/question-about-reverse-engineering-a-new-mode/242004)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [May 26, 2015, 3:56pm UTC](https://www.ruby-forum.com/t/question-about-reverse-engineering-a-new-mode/242004 "2015-05-26T15:56:58Z")
This is a bit of an idle question, but I’m hoping some knowledgable folks on here can offer advice. Mostly I’m trying to understand better what I don’t know, and the size of the challenge, before jumping in to a pro… --- ## [Sharing variable](https://www.ruby-forum.com/t/sharing-variable/242083)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 26, 2015, 1:40pm UTC](https://www.ruby-forum.com/t/sharing-variable/242083 "2015-05-26T13:40:47Z")
Hello I would like to share a variable “X” from my python block to any other block in GNU radio. How could i do that ? Thanks Luis --- ## [BPSK output abnormal](https://www.ruby-forum.com/t/bpsk-output-abnormal/242064)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [May 26, 2015, 11:29am UTC](https://www.ruby-forum.com/t/bpsk-output-abnormal/242064 "2015-05-26T11:29:16Z")
Hi everyone, I try to simulate file transfer using BPSK with block diagram File Source --\> PSK Mod --\> PSK Demod --\> File Sink The block setting is File Source : -file type = .jpg (282,8 kB (282.765 bytes)) -repeat… --- ## [Fhss](https://www.ruby-forum.com/t/fhss/242087)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 26, 2015, 9:44am UTC](https://www.ruby-forum.com/t/fhss/242087 "2015-05-26T09:44:04Z")
Hello everyone, I have got a serious problem while implementing frequency hopping spread spectrum using USRP B210.I tried to generate a python file using a GRC file containing a signal source followed by a sink.Then … --- ## [Re: Sharing variable](https://www.ruby-forum.com/t/re-sharing-variable/242086)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 26, 2015, 9:28am UTC](https://www.ruby-forum.com/t/re-sharing-variable/242086 "2015-05-26T09:28:17Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: Notion of buffering up input data in GNURadio](https://www.ruby-forum.com/t/re-notion-of-buffering-up-input-data-in-gnuradio/242085)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 26, 2015, 1:53am UTC](https://www.ruby-forum.com/t/re-notion-of-buffering-up-input-data-in-gnuradio/242085 "2015-05-26T01:53:42Z")
Hi Marcus, Thanks for your reply. So, you’re writing that application and ask us how your buffering works? that doesn’t sound right, so maybe I’m misunderstanding you? My bad. What I meant to say was the block that… --- ## [Notion of buffering up input data in GNURadio](https://www.ruby-forum.com/t/notion-of-buffering-up-input-data-in-gnuradio/242077)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 25, 2015, 8:50pm UTC](https://www.ruby-forum.com/t/notion-of-buffering-up-input-data-in-gnuradio/242077 "2015-05-25T20:50:30Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Conditional execution of work function](https://www.ruby-forum.com/t/conditional-execution-of-work-function/242076)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 25, 2015, 8:42pm UTC](https://www.ruby-forum.com/t/conditional-execution-of-work-function/242076 "2015-05-25T20:42:55Z")
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