# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=65 [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:** 66 --- ## [ISDB-T Modulation?](https://www.ruby-forum.com/t/isdb-t-modulation/230558)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 2\ **Last updated:** [June 23, 2014, 11:13pm UTC](https://www.ruby-forum.com/t/isdb-t-modulation/230558 "2014-06-23T23:13:04Z")
I am aware that ATSC, and various forms of DVB-T/2 modulators exist in GNURadio both with standard and custom blocks; but is there any active development or possibility of ISDB-T modulation? What exactly would need to … --- ## [Looking for USRP specialist, good payable](https://www.ruby-forum.com/t/looking-for-usrp-specialist-good-payable/230560)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 23, 2014, 8:32pm UTC](https://www.ruby-forum.com/t/looking-for-usrp-specialist-good-payable/230560 "2014-06-23T20:32:33Z")
Hi, urgently looking for USRP specialist we need to use USRP as gsm repeater to extend gsm coverage in rural area. Bi-directional Radio Frequency (RF) amplifier which can amplify and transmit a received Mobile Stat… --- ## [Ofdm parameters](https://www.ruby-forum.com/t/ofdm-parameters/230518)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 5\ **Last updated:** [June 23, 2014, 6:33pm UTC](https://www.ruby-forum.com/t/ofdm-parameters/230518 "2014-06-23T18:33:37Z")
Hello , I want to implement ofdm system with these parameters: FFT length=128 Occupied subcarriers=117. 4 pilots 1 DC 6 zeros subcarriers . I put these parameters in ofdm tx & ofdm Rx: Occupied carriers =(range(… --- ## [Sending/Receiving UDP Data Over Internet](https://www.ruby-forum.com/t/sending-receiving-udp-data-over-internet/230554)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 2\ **Last updated:** [June 23, 2014, 6:03pm UTC](https://www.ruby-forum.com/t/sending-receiving-udp-data-over-internet/230554 "2014-06-23T18:03:18Z")
Hello, We would like to send UDP data from a USRP over the internet to a remote computer. The setup on the host side is: USRP Source → UDP Sink And on the client side: UDP Source → Throttle → WX GUI FFT Sink This s… --- ## [Writing new block or editing existing block in Gnuradio Companion Windows](https://www.ruby-forum.com/t/writing-new-block-or-editing-existing-block-in-gnuradio-companion-windows/230546)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 23, 2014, 12:05pm UTC](https://www.ruby-forum.com/t/writing-new-block-or-editing-existing-block-in-gnuradio-companion-windows/230546 "2014-06-23T12:05:26Z")
Greetings everyone, My sincere apologies in advance if this question has been asked before, Is there any tutorial on how to write a new block in GRC windows OS? Those I searched are in linux OS.2) Or tutorial availab… --- ## [Guard band](https://www.ruby-forum.com/t/guard-band/241289)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [June 22, 2014, 6:21pm UTC](https://www.ruby-forum.com/t/guard-band/241289 "2014-06-22T18:21:14Z")
In ofdm transmitter , I want to add 6 subcarriers as a guard band between symbols , so that each symbol is fft + cp + guard band … How to add this guard band ? is there a block which add zeros ? I think I can make g… --- ## [BPSK demodulation](https://www.ruby-forum.com/t/bpsk-demodulation/230522)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 22, 2014, 11:05am UTC](https://www.ruby-forum.com/t/bpsk-demodulation/230522 "2014-06-22T11:05:21Z")
Hello, If UHD source acts as a mixer, why some examples (like usrp\_rx\_hrpt) use baseband information as the input of a PLL? Thank you in advance --- ## [Get\_tags\_in\_window not implemented in python](https://www.ruby-forum.com/t/get-tags-in-window-not-implemented-in-python/230525)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 22, 2014, 10:52am UTC](https://www.ruby-forum.com/t/get-tags-in-window-not-implemented-in-python/230525 "2014-06-22T10:52:51Z")
Hi, I’m trying to use the function get\_tags\_in\_window in an implementation of a gr.sync\_block in python. Apparently, this function is not visible to SWIG. Does anyone have a hint on what I can do? PS: get\_tags\_in\_r… --- ## [\[coproc\] Working Group Google Hangout - June 27](https://www.ruby-forum.com/t/coproc-working-group-google-hangout-june-27/230528)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 22, 2014, 4:02am UTC](https://www.ruby-forum.com/t/coproc-working-group-google-hangout-june-27/230528 "2014-06-22T04:02:35Z")
Based on the input from last week’s call for input on scheduling a google hangout: it looks like June 27th is best for everyone. I’m going to schedule the hangout for 2pm EDT / 6pm UTC (be sure to convert to your loc… --- ## [Why SWIG has been selected as C++ wrapper for Python for GNURadio?](https://www.ruby-forum.com/t/why-swig-has-been-selected-as-c-wrapper-for-python-for-gnuradio/230496)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 5\ **Last updated:** [June 21, 2014, 9:50am UTC](https://www.ruby-forum.com/t/why-swig-has-been-selected-as-c-wrapper-for-python-for-gnuradio/230496 "2014-06-21T09:50:32Z")
Hi All This is a question intended for the Software designers and maintainers of the GNURadio Is there a specific reason / advantage of using SWIG as a C++ wrapper over using other avaialble wrappers for C++ as … --- ## [Gnuradio + itpp error](https://www.ruby-forum.com/t/gnuradio-itpp-error/230505)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 21, 2014, 8:20am UTC](https://www.ruby-forum.com/t/gnuradio-itpp-error/230505 "2014-06-21T08:20:19Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [No UHD Devices found in Parallel Ubuntu Linux](https://www.ruby-forum.com/t/no-uhd-devices-found-in-parallel-ubuntu-linux/230460)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 2\ **Last updated:** [June 20, 2014, 7:44pm UTC](https://www.ruby-forum.com/t/no-uhd-devices-found-in-parallel-ubuntu-linux/230460 "2014-06-20T19:44:50Z")
The B200 works with out any problems if connected directly to the MAC OS, but a new ubuntu 14.04 install on parallels does not recognize the hardware: root@gnuradio:/usr/bin# uhd\_find\_devices linux; GNU C++ version 4… --- ## [GPN '14 Karlsruhe](https://www.ruby-forum.com/t/gpn-14-karlsruhe/230509)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 20, 2014, 7:31pm UTC](https://www.ruby-forum.com/t/gpn-14-karlsruhe/230509 "2014-06-20T19:31:35Z")
Are there any SDR hackers at GPN '14 in Karlsruhe, Germany? I’ll be hanging around with a USRP hacking some GNU Radio; I’d be interested to meet fellow SDR hackers. Also, we’ll be talking aobut the results of the IEEE… --- ## [Problem with firdes segfault](https://www.ruby-forum.com/t/problem-with-firdes-segfault/230500)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 20, 2014, 3:39pm UTC](https://www.ruby-forum.com/t/problem-with-firdes-segfault/230500 "2014-06-20T15:39:57Z")
I had gnuradio working on my ubuntu system and was hoping I wouldnt have to clutter with something like this. I have reinstalled a couple of times and am geting this odd error. when I run my test block I get this: … --- ## [Difficulty with File Meta Source block](https://www.ruby-forum.com/t/difficulty-with-file-meta-source-block/230503)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 20, 2014, 3:37pm UTC](https://www.ruby-forum.com/t/difficulty-with-file-meta-source-block/230503 "2014-06-20T15:37:34Z")
Hi all, I want to use “File Meta source” & “File Meta sink” block from Gnu Radio. My flow graph configuration is as follows : signal source (sine wave) → throttle → Meta file sink (Output.out) Using above configura… --- ## [Sample time alignment in GRC](https://www.ruby-forum.com/t/sample-time-alignment-in-grc/230373)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 6\ **Last updated:** [June 20, 2014, 3:22pm UTC](https://www.ruby-forum.com/t/sample-time-alignment-in-grc/230373 "2014-06-20T15:22:42Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Usrp e110 in standalone mode?](https://www.ruby-forum.com/t/usrp-e110-in-standalone-mode/230495)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 20, 2014, 1:29pm UTC](https://www.ruby-forum.com/t/usrp-e110-in-standalone-mode/230495 "2014-06-20T13:29:14Z")
Hi, I made an application on usrp e110 to send datas. I would like to make it operate in a standalone mode. Have you any suggestions to deal with this issue ? Thanks for help. Best regards, Wafa HAJ HMIDA --- ## [Creating OOT module](https://www.ruby-forum.com/t/creating-oot-module/230499)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 20, 2014, 11:47am UTC](https://www.ruby-forum.com/t/creating-oot-module/230499 "2014-06-20T11:47:04Z")
Hi I have written a block in python and was trying to create an out of tree module as given in the gnuradio tutorial. While using cmake …/ the following error occured. CMake Error: CMake can not determine linker lang… --- ## [Re: FSK demodulation](https://www.ruby-forum.com/t/re-fsk-demodulation/230494)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 20, 2014, 10:16am UTC](https://www.ruby-forum.com/t/re-fsk-demodulation/230494 "2014-06-20T10:16:48Z")
On Thu, Jun 19, 2014 at 12:35 PM, Marcus Müller removed\_email\_address@domain.invalid wrote: Hi Marc, Currently, I am trying to implement correlation receiver using FIR filters. I am looking into polyphase filterba… --- ## [SWIG and QT (QT4\_WRAP\_CPP issues)](https://www.ruby-forum.com/t/swig-and-qt-qt4-wrap-cpp-issues/230489)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 2\ **Last updated:** [June 20, 2014, 12:24am UTC](https://www.ruby-forum.com/t/swig-and-qt-qt4-wrap-cpp-issues/230489 "2014-06-20T00:24:49Z")
Hi! I try to add a QT GUI to my OOT module (gr-radar). I have some issues with including the QT stuff in cmake and swig. The problem is this error: /gr-radar/swig/…/lib/range\_velocity\_diagram.h:45: Error: Syntax erro… --- ## [Make install for OpenBTS 2.8.0 gives errors](https://www.ruby-forum.com/t/make-install-for-openbts-2-8-0-gives-errors/215392)
**Author:** [@luislavena](https://www.ruby-forum.com/u/luislavena)\ **Replies:** 4\ **Last updated:** [June 19, 2014, 11:27pm UTC](https://www.ruby-forum.com/t/make-install-for-openbts-2-8-0-gives-errors/215392 "2014-06-19T23:27:21Z")
CKs-MacBook-Pro:openbts-P2.8.0Opelousas 2 RavindranKrishnaMudaliar$ sudo make install Password: Making install in config make\[2\]: Nothing to be done for install-exec-am'. make\[2\]: Nothing to be done forinstall-data-a… --- ## [Tampa area GNU Radio users?](https://www.ruby-forum.com/t/tampa-area-gnu-radio-users/234780)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [June 19, 2014, 9:05pm UTC](https://www.ruby-forum.com/t/tampa-area-gnu-radio-users/234780 "2014-06-19T21:05:49Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Dev Call June](https://www.ruby-forum.com/t/dev-call-june/230486)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 19, 2014, 7:31pm UTC](https://www.ruby-forum.com/t/dev-call-june/230486 "2014-06-19T19:31:23Z")
Hi everyone, this months dev call recording can be found here: Minutes and action items are here: http://gnuradio.org/redmine/projects/gnuradio/wiki/Call20140619 Next call is July 17th, same time as usua… --- ## [Re: Question about gnuradio-companion](https://www.ruby-forum.com/t/re-question-about-gnuradio-companion/230482)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 19, 2014, 5:27pm UTC](https://www.ruby-forum.com/t/re-question-about-gnuradio-companion/230482 "2014-06-19T17:27:47Z")
But with this info, I’m not sure. That’s not an error that GNU Radio is gnuradio companion. But as before if I execute the python script companion and that could be annoying. May also be a problem if trying to r… --- ## [Prototype for make() does not match any in class](https://www.ruby-forum.com/t/prototype-for-make-does-not-match-any-in-class/230468)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 19, 2014, 10:25am UTC](https://www.ruby-forum.com/t/prototype-for-make-does-not-match-any-in-class/230468 "2014-06-19T10:25:57Z")
Dear all, I’m writing an out-of-tree C++ block performing some PSK mapping method (BPSK, QPSK. 16PSK, 256PSK). I got this error when running make command: /home/khachoang/gr-Hoang/lib/Digital\_Mapper\_impl.cc:36:5: erro… --- ## [Re: FSK demodulation](https://www.ruby-forum.com/t/re-fsk-demodulation/230461)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 19, 2014, 9:37am UTC](https://www.ruby-forum.com/t/re-fsk-demodulation/230461 "2014-06-19T09:37:13Z")
Hi Marcus! Thanks for your detailed reply. To what I have studied yet polar discriminator will be affected more by the amplitude variations during transmission. Currently I do not know how to cater these variations,… --- ## [Testing block written in block](https://www.ruby-forum.com/t/testing-block-written-in-block/230441)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 4\ **Last updated:** [June 19, 2014, 5:37am UTC](https://www.ruby-forum.com/t/testing-block-written-in-block/230441 "2014-06-19T05:37:50Z")
Hi I’m new to GNU radio and is trying to develop my own block. I want to develop a block that intake a vector and out put sum of the vector elements. I used the out of tree module and followed tutorial using python c… --- ## [FSK demodulation](https://www.ruby-forum.com/t/fsk-demodulation/230454)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 18, 2014, 5:20pm UTC](https://www.ruby-forum.com/t/fsk-demodulation/230454 "2014-06-18T17:20:15Z")
Is there any existing 4FSK transceiver system in gnuradio ? Yes. The OP25 project has an implementation of FSK4 for use in P25, where FSK4 is sometimes known as “C4FM”. Both modulation and demodulation is supported.… --- ## [FSK demodulation](https://www.ruby-forum.com/t/fsk-demodulation/230446)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 18, 2014, 2:23pm UTC](https://www.ruby-forum.com/t/fsk-demodulation/230446 "2014-06-18T14:23:45Z")
Hi, I am new to gnuradio, I want to develop 4FSK system. transmitter and receiver. Is there any existing 4FSK transceiver system in gnuradio ? Also, which one of the following two is the best/optimum 4FSK demodulator … --- ## [CMake 3.0.0 is out](https://www.ruby-forum.com/t/cmake-3-0-0-is-out/230449)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 18, 2014, 2:07pm UTC](https://www.ruby-forum.com/t/cmake-3-0-0-is-out/230449 "2014-06-18T14:07:06Z")
CMake 3.0.0 has lots of bug fixes from the last release (2.8.12), and it also contains a number of policy changes. The primary ones that effect GNU Radio’s build system are in (1) using a name before it is declared (… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=64) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=66)