# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=27 [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:** 28 --- ## [Issues with includes](https://www.ruby-forum.com/t/issues-with-includes/241487)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 9, 2015, 7:40pm UTC](https://www.ruby-forum.com/t/issues-with-includes/241487 "2015-04-09T19:40:49Z")
hello, I am pretty new to swigs and cmake so I apologize ahead of time if this is a bit of basic question but I have been having some problems geting c++ blocks to run if I add an include to my own generated code. f… --- ## [OFDM Tranceiver](https://www.ruby-forum.com/t/ofdm-tranceiver/241485)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 9, 2015, 4:46pm UTC](https://www.ruby-forum.com/t/ofdm-tranceiver/241485 "2015-04-09T16:46:19Z")
Hi, I am trying to make an OFDM transceiver using my USRP1. I used the existing examples of GRC. (tx\_ofdm.grc and rx\_ofdm.grc) I am having problem in the communication while i transmit in HF band using LFTX and LFRX … --- ## [Dvb-t/t2](https://www.ruby-forum.com/t/dvb-t-t2/241428)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 17\ **Last updated:** [April 9, 2015, 2:03pm UTC](https://www.ruby-forum.com/t/dvb-t-t2/241428 "2015-04-09T14:03:53Z")
Hi, With Rons help I got the DVB-T/T2 flowgraphs up and running. DVB-T works great, no issues at all, while DVB-T2 is somehow flaky in reception. When using a cheap DVB-x tester, the DVB-T2 constellation is phase sh… --- ## [Installing GNU Radio blocks as a regular user](https://www.ruby-forum.com/t/installing-gnu-radio-blocks-as-a-regular-user/241468)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [April 8, 2015, 6:32pm UTC](https://www.ruby-forum.com/t/installing-gnu-radio-blocks-as-a-regular-user/241468 "2015-04-08T18:32:38Z")
Hi everyone, We’re trying to implement a GNU Radio course here in Lyon (France) where we take the students step-by-step into coding GR modules. At some point we’d like them to follow the out-of-tree modules tutorial b… --- ## [Pybombs bombs](https://www.ruby-forum.com/t/pybombs-bombs/241457)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 9\ **Last updated:** [April 8, 2015, 4:23pm UTC](https://www.ruby-forum.com/t/pybombs-bombs/241457 "2015-04-08T16:23:10Z")
Hi All, I made a mistake this morning and tried to refresh gnuradio with pybombs to test an FCD ProPlus against the latest main branch. Pybombs has worked fine up until now and I successfully installed it on a differ… --- ## [Error while running example of detect\_ff block](https://www.ruby-forum.com/t/error-while-running-example-of-detect-ff-block/241462)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 8, 2015, 7:00am UTC](https://www.ruby-forum.com/t/error-while-running-example-of-detect-ff-block/241462 "2015-04-08T07:00:16Z")
hey, i have successfully imported “detect\_ff” block. but right now I am getting runtime error while running example on grc as follows. File “/home/abhishek/top\_block.py”, line 84, in tb = top\_block() File “/home/a… --- ## [Re: pccc encoder](https://www.ruby-forum.com/t/re-pccc-encoder/241451)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 8, 2015, 3:43am UTC](https://www.ruby-forum.com/t/re-pccc-encoder/241451 "2015-04-08T03:43:38Z")
There are several issues with your code: a PCCC encoder (as any digital communication encoder) cannot accept a “sine wave” as its input! it only accepts discrete information. In this case it should be numbers {0,1,… --- ## [SDRA-2015 Call For Papers](https://www.ruby-forum.com/t/sdra-2015-call-for-papers/241461)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 8, 2015, 12:22am UTC](https://www.ruby-forum.com/t/sdra-2015-call-for-papers/241461 "2015-04-08T00:22:23Z")
Dear list, excuses for repeated posting. Two weeks before abstract submission deadline I’d like to direct your attention to the Software Defined Radio Academy 2015 in Friedrichshafen (HAMRADIO subconference) Pleas… --- ## [Two Clock Drift Compensation, howto?](https://www.ruby-forum.com/t/two-clock-drift-compensation-howto/241450)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 7, 2015, 9:46pm UTC](https://www.ruby-forum.com/t/two-clock-drift-compensation-howto/241450 "2015-04-07T21:46:08Z")
Dear all! When I have multiple hw audio (or other) sources and sinks gnuradio is suffering from the “two clock problem”. From the docs I have read, one means to mitigate against under- or over- runs is to have the se… --- ## [Creating an OOT block similar to Corr & Sync using Python](https://www.ruby-forum.com/t/creating-an-oot-block-similar-to-corr-sync-using-python/241456)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 7, 2015, 8:10pm UTC](https://www.ruby-forum.com/t/creating-an-oot-block-similar-to-corr-sync-using-python/241456 "2015-04-07T20:10:30Z")
Hi All, I am trying to implement a MIMO algorithm in a custom Python block with vectors in & out. What i want to accomplish in this custom block is to first correlate the input vectors with a given pilot matrix(e.g. … --- ## [Transmission issue in USRP N210](https://www.ruby-forum.com/t/transmission-issue-in-usrp-n210/241444)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [April 7, 2015, 7:40pm UTC](https://www.ruby-forum.com/t/transmission-issue-in-usrp-n210/241444 "2015-04-07T19:40:24Z")
Hi all, I have recently installed openbts-2.8 on a banana-pi (Processor: armv7) board to work with USRP N210. Had all the pre-requisite installations and procedures been done, I noticed that, the transmitter is not w… --- ## [Help Me](https://www.ruby-forum.com/t/help-me/241424)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 7, 2015, 7:34pm UTC](https://www.ruby-forum.com/t/help-me/241424 "2015-04-07T19:34:58Z")
Hi, How do I Generate New locks and use the fsm const variable &FSM is the .cc ? When I write the block and compiled by the terminal , it generates an error that fsm is not declared. In the .cc file I’m uploading on t… --- ## [Error in creating a block](https://www.ruby-forum.com/t/error-in-creating-a-block/241441)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 7, 2015, 4:18pm UTC](https://www.ruby-forum.com/t/error-in-creating-a-block/241441 "2015-04-07T16:18:38Z")
Hi all, I crated a block named costas\_loop\_cc. it works fine for 2psk, 4psk,4qam and 8psk. But it does not support to 16QAM i.e order 16. when I execute with order 16 it shows the error like this: Generating: “/home… --- ## [Clipping Complex Samples to +/- 1.0?](https://www.ruby-forum.com/t/clipping-complex-samples-to-1-0/241426)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 7, 2015, 3:12pm UTC](https://www.ruby-forum.com/t/clipping-complex-samples-to-1-0/241426 "2015-04-07T15:12:23Z")
This may be more of a general C++ question than a GNU Radio question… Is there any super convenient and fast way to clip a complex signal to +/- 1.0 on both I & Q? Something other than splitting them up into floats … --- ## [Finding information](https://www.ruby-forum.com/t/finding-information/241434)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 7, 2015, 11:05am UTC](https://www.ruby-forum.com/t/finding-information/241434 "2015-04-07T11:05:30Z")
Hi all, I am trying to add a block which does an extra clever work. This needs a sound knowledge on editing several subdirectories like swig, grc and cmakefiles.txt etc. as you have stated in the out of tree modules p… --- ## [This file requires compiler and library support for the ISO C++ standard](https://www.ruby-forum.com/t/this-file-requires-compiler-and-library-support-for-the-iso-c-standard/241429)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 7, 2015, 7:17am UTC](https://www.ruby-forum.com/t/this-file-requires-compiler-and-library-support-for-the-iso-c-standard/241429 "2015-04-07T07:17:34Z")
Hello everyone, I’m trying to extract the year, month, day, hour, minute, second and millisecond from an std::chrono::time\_point object in my OOT module, but when I try compiling it, it gives me an error as the title… --- ## [Transfer parameters/variables per TCP/UDP socket](https://www.ruby-forum.com/t/transfer-parameters-variables-per-tcp-udp-socket/241413)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 7, 2015, 4:40am UTC](https://www.ruby-forum.com/t/transfer-parameters-variables-per-tcp-udp-socket/241413 "2015-04-07T04:40:54Z")
Hi, i have two grc applications. One TCP server application and one TCP client application. I want to change a parameter with a WX GUI slider on the client side and transport it to the server side. My first idea was … --- ## [Creating custom source block using python-repeated output](https://www.ruby-forum.com/t/creating-custom-source-block-using-python-repeated-output/241427)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 7, 2015, 3:29am UTC](https://www.ruby-forum.com/t/creating-custom-source-block-using-python-repeated-output/241427 "2015-04-07T03:29:47Z")
I’m creating a source block using python. The block takes input from the user for the length of the vector. Some math is done inside the block and the vector is produced. When I run it, the correct vector is being pro… --- ## [Gr-fosphor with pybombs](https://www.ruby-forum.com/t/gr-fosphor-with-pybombs/234426)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 12\ **Last updated:** [April 7, 2015, 2:52am UTC](https://www.ruby-forum.com/t/gr-fosphor-with-pybombs/234426 "2015-04-07T02:52:24Z")
Hey folks, So i installed the gr-fosphor ‘app’ using the pybombs recipe and it seems to install ok, but when i run it I get the output listed below. Any ideas here? Thanks, -B cnlsdr1@cnlsdr1:~/pybombs$ osmocom\_f… --- ## [SRIF Workshop 2015](https://www.ruby-forum.com/t/srif-workshop-2015/241425)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 7, 2015, 12:56am UTC](https://www.ruby-forum.com/t/srif-workshop-2015/241425 "2015-04-07T00:56:54Z")
Hi everyone, I wanted to pass out information on the 2015 SRIF (Software Radio Implementation Forum) workshop that we’re hosting as part of this year’s ACM Mobicom conference in Paris. There is a lot of great work goi… --- ## [Pccc encoder](https://www.ruby-forum.com/t/pccc-encoder/241423)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 6, 2015, 10:15pm UTC](https://www.ruby-forum.com/t/pccc-encoder/241423 "2015-04-06T22:15:40Z")
Hello. im new at this. First i apologize for my english. Im trying to use the pccc encoder but i\`m having troubble with the interleaver parameter. My flow graph: vector source --\>pccc encoder --\>chunks to symbols --\>p… --- ## [How to define a minimum number of input samples for a block](https://www.ruby-forum.com/t/how-to-define-a-minimum-number-of-input-samples-for-a-block/241373)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [April 6, 2015, 3:34pm UTC](https://www.ruby-forum.com/t/how-to-define-a-minimum-number-of-input-samples-for-a-block/241373 "2015-04-06T15:34:43Z")
Hi, I’m developing a block that need a minimum number of input samples to process, for example, the block must have at least 1000 samples. In the work() function may I compare if the ninput\_items\[\] is greater than 1… --- ## [Empty volk directory when I git gnuradio](https://www.ruby-forum.com/t/empty-volk-directory-when-i-git-gnuradio/241367)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 9\ **Last updated:** [April 6, 2015, 5:58am UTC](https://www.ruby-forum.com/t/empty-volk-directory-when-i-git-gnuradio/241367 "2015-04-06T05:58:23Z")
Looks like some kind of link or something is broken when you try to GIT gnuradio. The build fails as volk will not build, and the volk sub- directory is empty. I did successfully GIT volk directly and clone it to it… --- ## [Attribute error](https://www.ruby-forum.com/t/attribute-error/241415)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 5, 2015, 11:56pm UTC](https://www.ruby-forum.com/t/attribute-error/241415 "2015-04-05T23:56:38Z")
hey, I have been working with Eigen value detection in GNU Radio…I am new to this and i get the following error whenever i execute the flowgraph in GRC. File “/home/abhishek/top\_block.py”, line 53, in init self.howt… --- ## [Announcing cgran.org: Re-launching the Comprehensive GNU Radio Archive Network](https://www.ruby-forum.com/t/announcing-cgran-org-re-launching-the-comprehensive-gnu-radio-archive-network/241406)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 5, 2015, 7:17pm UTC](https://www.ruby-forum.com/t/announcing-cgran-org-re-launching-the-comprehensive-gnu-radio-archive-network/241406 "2015-04-05T19:17:55Z")
Hi all, I am happy to be able to announce that the Comprehensive GNU Radio Archive Network (CGRAN) is now live at http://cgran.org. It’s a bit different from the previous version. Some notes: The primary purpose… --- ## [Binary Slicer](https://www.ruby-forum.com/t/binary-slicer/241408)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 5, 2015, 6:25am UTC](https://www.ruby-forum.com/t/binary-slicer/241408 "2015-04-05T06:25:11Z")
Hey, guys, what’s up? I need a block that can give me an output with 0s and 1s, like a binary output. Do you know which block can do that? Is it the Binary Slicer block? How to use it? Please, help me. Thanks a lot! --- ## [Top-block does not find Probe Signal block](https://www.ruby-forum.com/t/top-block-does-not-find-probe-signal-block/241402)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 4, 2015, 12:56am UTC](https://www.ruby-forum.com/t/top-block-does-not-find-probe-signal-block/241402 "2015-04-04T00:56:06Z")
Hello GNUR’s! I am currently working with a SDR dongle which I want to lock at four different frequencies to see four consecutive parts of the spectrum. I have to do so because the sampling rate is not enough (2.4 MHz… --- ## [Set block parameters / variables from cmd line?](https://www.ruby-forum.com/t/set-block-parameters-variables-from-cmd-line/241395)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [April 3, 2015, 7:52pm UTC](https://www.ruby-forum.com/t/set-block-parameters-variables-from-cmd-line/241395 "2015-04-03T19:52:11Z")
Hi, i want to run an gnuradio .py application from the command line and want to choose parameters (like the frequency or sound level) on the command line. So i think about if it is possible to set block parameters / … --- ## [Variable blocks](https://www.ruby-forum.com/t/variable-blocks/241400)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 3, 2015, 5:58pm UTC](https://www.ruby-forum.com/t/variable-blocks/241400 "2015-04-03T17:58:15Z")
Hello, I need a variable that can storage a lot of values (like 10000) and after I have to use this values in an add block. Which block storages a lot of values and how can I use them? Please, help me. Thank you. --- ## [How to use Binary Slicer](https://www.ruby-forum.com/t/how-to-use-binary-slicer/241399)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 3, 2015, 5:05pm UTC](https://www.ruby-forum.com/t/how-to-use-binary-slicer/241399 "2015-04-03T17:05:48Z")
Hey guys, Please, can you help me to use the Binary Slicer block? Is it a FLOAT block? What block do I have to use to convert a signal and put it in Binary Slicer input? Thank you! [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=26) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=28)