# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=13 [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:** 14 --- ## [Newbie Question on set\_interpolation and a New Variable Repeat Block](https://www.ruby-forum.com/t/newbie-question-on-set-interpolation-and-a-new-variable-repeat-block/242844)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [August 2, 2015, 1:08am UTC](https://www.ruby-forum.com/t/newbie-question-on-set-interpolation-and-a-new-variable-repeat-block/242844 "2015-08-02T01:08:25Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Eb/N0 Ofdm](https://www.ruby-forum.com/t/eb-n0-ofdm/242843)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [August 1, 2015, 8:19pm UTC](https://www.ruby-forum.com/t/eb-n0-ofdm/242843 "2015-08-01T20:19:49Z")
Hello I’m simulating an OFDM scheme with channel coding and digital modulation (16 QAM). I would like to calculate BER values with an “Error Rate” block while I vary the amplitude of the noise voltage, using for th… --- ## [Building an OOT modules with an In Tree Dependency](https://www.ruby-forum.com/t/building-an-oot-modules-with-an-in-tree-dependency/242817)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 7\ **Last updated:** [August 1, 2015, 1:56am UTC](https://www.ruby-forum.com/t/building-an-oot-modules-with-an-in-tree-dependency/242817 "2015-08-01T01:56:17Z")
I’m trying to make an out of tree module based on blocks::file\_sink that has some additional functionality I need. Right now, I’ve built it OOT, but an having trouble getting it to work. The code (file\_sink\_impl.cc, f… --- ## [Clock Recovery MM documentation](https://www.ruby-forum.com/t/clock-recovery-mm-documentation/242814)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 12\ **Last updated:** [July 31, 2015, 9:34pm UTC](https://www.ruby-forum.com/t/clock-recovery-mm-documentation/242814 "2015-07-31T21:34:33Z")
Hello, I would like to find a proper documentation on MM algorithm block (paper for example). Any ideas ? Thank you. Regards. --- ## [The RF LO does not support the requested frequency](https://www.ruby-forum.com/t/the-rf-lo-does-not-support-the-requested-frequency/242807)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [July 31, 2015, 8:41pm UTC](https://www.ruby-forum.com/t/the-rf-lo-does-not-support-the-requested-frequency/242807 "2015-07-31T20:41:58Z")
hi. i am using ubuntu 14.04 and i am trying run wifi\_rx.grc.when i try run this wifi\_rx.grc it comes out with this: Generating: “/home/userr/Downloads/gr-ieee802-11-master/examples/wifi\_rx.py” Executing: “/home/user… --- ## [Error during Install my\_qpsk\_demod in grc](https://www.ruby-forum.com/t/error-during-install-my-qpsk-demod-in-grc/242825)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [July 31, 2015, 7:57pm UTC](https://www.ruby-forum.com/t/error-during-install-my-qpsk-demod-in-grc/242825 "2015-07-31T19:57:31Z")
please give some suggestion related to this error --- ## [Re: file source with gr-ieee802.11 tx](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242833)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [July 31, 2015, 7:41pm UTC](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242833 "2015-07-31T19:41:09Z")
It builds fine, but when I run my GRC script, the output to a file sink (for simplicity I am dumping to a file instead of UDP for now), doesn’t change its length. I did reload blocks in GRC too. I need to do more te… --- ## [SOCIS project update 9](https://www.ruby-forum.com/t/socis-project-update-9/242826)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [July 31, 2015, 6:51pm UTC](https://www.ruby-forum.com/t/socis-project-update-9/242826 "2015-07-31T18:51:29Z")
Hey community! Here we go again. Another project update. I’m working with VOLK and SIMD for two weeks now. I could fix some hiccups with last weeks pack and unpack kernels. They run just fine during test now. Also, … --- ## [Issues with OOT](https://www.ruby-forum.com/t/issues-with-oot/242830)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [July 31, 2015, 6:49pm UTC](https://www.ruby-forum.com/t/issues-with-oot/242830 "2015-07-31T18:49:44Z")
Hi everyone, I am writing here because I have some issues using an OOT module. Actually, I have gnuradio installed on my desktop. I want to install gnuradio on other laptop so that I can use 2 USRP. So, I followed t… --- ## [Re: file source with gr-ieee802.11 tx](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242832)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [July 31, 2015, 6:25pm UTC](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242832 "2015-07-31T18:25:12Z")
The transceiver wraps your payload in some headers that add stuff like MAC address, frame type, and CRC. These are the minimum fields that are required so that a WiFi card actually accepts the frame. Makes sense. … --- ## [Re: file source with gr-ieee802.11 tx](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242828)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [July 31, 2015, 3:12pm UTC](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242828 "2015-07-31T15:12:58Z")
The wifi\_tx example GRC comes with a Socket PDU source. Just send UDP packets to the port specified containing a IEEE 802.11 packet’s amount of data per UDP packet; netcat/nc/ncat is sadly no good for this, because… --- ## [Re: Does any source block support Signalhound BB60C?](https://www.ruby-forum.com/t/re-does-any-source-block-support-signalhound-bb60c/242824)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [July 31, 2015, 10:08am UTC](https://www.ruby-forum.com/t/re-does-any-source-block-support-signalhound-bb60c/242824 "2015-07-31T10:08:01Z")
Hi Patrick, This was just raised on the Signal Hound Facebook page. They were proposing to introduce support for the BB60C to HDSDR and I suggested GNU Radio in the comments. Regards, Derek --- ## [SNR question](https://www.ruby-forum.com/t/snr-question/242818)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [July 30, 2015, 11:51pm UTC](https://www.ruby-forum.com/t/snr-question/242818 "2015-07-30T23:51:40Z")
Hi I would want to know if there a way to calculate SNR for a qpsk, 16 QAM and 64 QAM signals. I have been using the “divide” block, which has as inputs, the signal that entries to the channel and a noise source fi… --- ## [USRP B210 gpio on J504](https://www.ruby-forum.com/t/usrp-b210-gpio-on-j504/242815)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 30, 2015, 8:54pm UTC](https://www.ruby-forum.com/t/usrp-b210-gpio-on-j504/242815 "2015-07-30T20:54:01Z")
Hi, I want to control an antenna multiplxer via J504 gpio port. Actually I want to have logic 1 and logic 0 in order to switch the multiplxer. But it is difficult to find gpio example for B210. I have new version of … --- ## [Error with gr\_modtool makexml howto\_detect\_ff](https://www.ruby-forum.com/t/error-with-gr-modtool-makexml-howto-detect-ff/242797)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 28, 2015, 11:08am UTC](https://www.ruby-forum.com/t/error-with-gr-modtool-makexml-howto-detect-ff/242797 "2015-07-28T11:08:28Z")
I am working to make a detector block in gnuradio 3.6.5.1 using gr-how “out-of-tree module”. I am stuck with an error during " gr\_modtool makexml howto\_detect\_ff " command. GNU Radio module name identified: howto War… --- ## [Sync input streams on VOR Signal](https://www.ruby-forum.com/t/sync-input-streams-on-vor-signal/242719)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [July 27, 2015, 3:10pm UTC](https://www.ruby-forum.com/t/sync-input-streams-on-vor-signal/242719 "2015-07-27T15:10:18Z")
Hello, I am trying to process a VOR signal. My blocks look like the following. Source v Resample v \_\_\_\_… --- ## [Build C++ processing block that adds a preamble](https://www.ruby-forum.com/t/build-c-processing-block-that-adds-a-preamble/242714)
**Author:** [@gabri187](https://www.ruby-forum.com/u/gabri187)\ **Replies:** 0\ **Last updated:** [July 20, 2015, 11:00am UTC](https://www.ruby-forum.com/t/build-c-processing-block-that-adds-a-preamble/242714 "2015-07-20T11:00:45Z")
Hello, I am trying to build my own block. The block should operate as follows: The block receive the sequence of the input stream. The block divides the input sequence in blocks of d\_pkt\_len elements, a predefined va… --- ## [Help about gr-ieee802-11](https://www.ruby-forum.com/t/help-about-gr-ieee802-11/242658)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [July 13, 2015, 5:56am UTC](https://www.ruby-forum.com/t/help-about-gr-ieee802-11/242658 "2015-07-13T05:56:33Z")
hi.i am newbie using gnuradio.when i try run the wifi\_loopback is comes out with this, Preferences file: /home/userr/.grc Block paths: /usr/local/share/gnuradio/grc/blocks /home/userr/.grc\_gnuradio Loading: “/home/… --- ## [USRP transmitting timestamp](https://www.ruby-forum.com/t/usrp-transmitting-timestamp/242645)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [July 10, 2015, 7:53pm UTC](https://www.ruby-forum.com/t/usrp-transmitting-timestamp/242645 "2015-07-10T19:53:29Z")
hi, I want to transmit a frame from a USRP to another USRP. I think that is a packed based transmitting. is there any method to get the transmitting timestamp of USRP sink? I check the usrp\_sink\_impl.cc. there is th… --- ## [Type Selectable GRC Blocks](https://www.ruby-forum.com/t/type-selectable-grc-blocks/242620)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [July 8, 2015, 1:45am UTC](https://www.ruby-forum.com/t/type-selectable-grc-blocks/242620 "2015-07-08T01:45:42Z")
Hi all, I made a grc block that allows the user to select the input/output type using a drop down box. For a while, it seemed like what I had implemented worked fine. Recently, however, only selecting the complex dat… --- ## [\[UHD\] Replacing Cheetah Templates with Mako](https://www.ruby-forum.com/t/uhd-replacing-cheetah-templates-with-mako/242619)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [July 7, 2015, 8:09pm UTC](https://www.ruby-forum.com/t/uhd-replacing-cheetah-templates-with-mako/242619 "2015-07-07T20:09:12Z")
Dear UHD users, We will be replacing Cheetah as a template engine with the less-dead Mako template engine. I have pushed a branch for feedback etc. to our github page: https://github.com/EttusResearch/uhd/tree/uhd/py… --- ## [Why alignment feature work only when output\_multiple not set](https://www.ruby-forum.com/t/why-alignment-feature-work-only-when-output-multiple-not-set/242331)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [July 7, 2015, 3:29pm UTC](https://www.ruby-forum.com/t/why-alignment-feature-work-only-when-output-multiple-not-set/242331 "2015-07-07T15:29:22Z")
Hi, After go through the block\_executor.cc, I found alignment feature work only when output\_multiple not set, why them can not work at the same time? – Thanks Tiankun --- ## [Python decoder and framer for ADSB (gr-adsb)](https://www.ruby-forum.com/t/python-decoder-and-framer-for-adsb-gr-adsb/242618)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [July 7, 2015, 10:34am UTC](https://www.ruby-forum.com/t/python-decoder-and-framer-for-adsb-gr-adsb/242618 "2015-07-07T10:34:21Z")
Hi, I’ve been playing with decoding ADSB for a while. While dump1090 does a really great job, the code is - uhm - an acquired taste. I’ve just released my GNU Radio blocks for a ADSB framer and decoder (both written … --- ## [Calling C++ method from Python](https://www.ruby-forum.com/t/calling-c-method-from-python/242590)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [July 7, 2015, 2:25am UTC](https://www.ruby-forum.com/t/calling-c-method-from-python/242590 "2015-07-07T02:25:23Z")
Hi, I have worked my way through the Guided Tutorials on gnuradio.org. I have written OOT blocks in Python and managed to expose some set methods in the block as callbacks. Now I have written an OOT C++ block sweeper… --- ## [Numpy question](https://www.ruby-forum.com/t/numpy-question/242603)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 8\ **Last updated:** [July 6, 2015, 10:10pm UTC](https://www.ruby-forum.com/t/numpy-question/242603 "2015-07-06T22:10:40Z")
I’m trying to build gnuradio for a system without numpy. cmake reports correctly – – Python checking for pygtk \>= 2.10.0 – Python checking for pygtk \>= 2.10.0 - not found – Python checking for numpy – Python checkin… --- ## [How to replace gr\_complex\_to\_xxx](https://www.ruby-forum.com/t/how-to-replace-gr-complex-to-xxx/242588)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [July 6, 2015, 9:04pm UTC](https://www.ruby-forum.com/t/how-to-replace-gr-complex-to-xxx/242588 "2015-07-06T21:04:38Z")
Hi, I am trying to migrate an OOT module written in 2010 to 3.7. I think (hope) that the final hurdle to achieving this is having to deal with gr\_complex\_to\_xxx that was removed in 3.7 but which is referenced in the … --- ## [Re: Suppressing UHD prints](https://www.ruby-forum.com/t/re-suppressing-uhd-prints/242606)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [July 6, 2015, 8:41pm UTC](https://www.ruby-forum.com/t/re-suppressing-uhd-prints/242606 "2015-07-06T20:41:50Z")
@Sebastion “Even if ’ uhd::msg::register\_handler’ would be exposed to python, you still can’t drop-in your own null-handler. Swig doesn’t support callbacks in the target language (python).” This seems precisely what … --- ## [Generate a specific wave form](https://www.ruby-forum.com/t/generate-a-specific-wave-form/242512)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 31\ **Last updated:** [July 6, 2015, 7:15pm UTC](https://www.ruby-forum.com/t/generate-a-specific-wave-form/242512 "2015-07-06T19:15:22Z")
Hello, guys. I need a help, please. I need to generate the kind of wave showned in the picture attached, but I don’t know which are the proper blocks. Can anyone help me, please? Image’s credits: http://www.ece.uvic… --- ## [Cmake question](https://www.ruby-forum.com/t/cmake-question/242596)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [July 6, 2015, 6:35pm UTC](https://www.ruby-forum.com/t/cmake-question/242596 "2015-07-06T18:35:02Z")
I need to modify the SONAME of some gnuradio libs. In the gnuradio/volk/CMakeList.txt there is an entry set\_target\_properties(volk PROPERTIES SOVERSION ${LIBVER}) that sets the SONAME. But how is this done for other l… --- ## [Audio streaming](https://www.ruby-forum.com/t/audio-streaming/242605)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [July 6, 2015, 6:18pm UTC](https://www.ruby-forum.com/t/audio-streaming/242605 "2015-07-06T18:18:40Z")
I have an AM demodulator producing audio data. How do I stream that audio to another computer to play out the audio using VLC? Mark. [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=12) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=14)