# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=16 [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:** 17 --- ## [Help retrieving from gr-radio-astonomy](https://www.ruby-forum.com/t/help-retrieving-from-gr-radio-astonomy/242431)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [June 24, 2015, 8:31pm UTC](https://www.ruby-forum.com/t/help-retrieving-from-gr-radio-astonomy/242431 "2015-06-24T20:31:20Z")
I want to retrieve the last revision (a549bd11 ) from this repository but I’m blowed if I can see how. The repository seems to have been converted from subversion to git but, if I try to clone the revision I get an … --- ## [Ofdm frequency offset](https://www.ruby-forum.com/t/ofdm-frequency-offset/242441)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [June 24, 2015, 6:16pm UTC](https://www.ruby-forum.com/t/ofdm-frequency-offset/242441 "2015-06-24T18:16:56Z")
Dear all: Thank you in advance. 1. I want to ask a question about the new ofdm example.And I know the receiver have used the SCA(schmidl and cox algorithm) algorithm.Now in my application,maybe this algorithm isn’t … --- ## [Absolute Offset Question](https://www.ruby-forum.com/t/absolute-offset-question/242448)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 24, 2015, 5:51pm UTC](https://www.ruby-forum.com/t/absolute-offset-question/242448 "2015-06-24T17:51:14Z")
Hi all, I’ve been playing around with tags this morning. I created a tagged stream where there is a tag on every sample (stream to tagged stream block with packet length = 1). I noticed that I can’t get a tag.offset… --- ## [\#include "vector.hpp"](https://www.ruby-forum.com/t/include-vector-hpp/242410)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 12\ **Last updated:** [June 24, 2015, 8:08am UTC](https://www.ruby-forum.com/t/include-vector-hpp/242410 "2015-06-24T08:08:43Z")
Hello I’m trying to create a block which C++ code needs to use include “vector.hpp”. But I;m getting this error: fatal error: vector.hpp: No such file or directory. Is there a way to do this? Thank you very much. … --- ## [Verifying Turbo encoder output (was: Re: (no subject)](https://www.ruby-forum.com/t/verifying-turbo-encoder-output-was-re-no-subject/242430)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 24, 2015, 6:36am UTC](https://www.ruby-forum.com/t/verifying-turbo-encoder-output-was-re-no-subject/242430 "2015-06-24T06:36:59Z")
Salija, the notation interleaver(666) is one way to generate a random interleaver with a given seed (666 in this case). The pccc block requires two FSM (finite state machine) specifications (one for each of the c… --- ## [Set\_bandwidth on UHD called from osmosdr](https://www.ruby-forum.com/t/set-bandwidth-on-uhd-called-from-osmosdr/242439)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 24, 2015, 4:17am UTC](https://www.ruby-forum.com/t/set-bandwidth-on-uhd-called-from-osmosdr/242439 "2015-06-24T04:17:57Z")
The osmosdr source/sink blocks provide a “bandwidth” field, which defaults to 0. Previously on B2xx this field would have no effect, because up until this point, the setting of the analog bandwidth on B2xx did no… --- ## [How to write a python code in GNU?](https://www.ruby-forum.com/t/how-to-write-a-python-code-in-gnu/242436)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 24, 2015, 3:47am UTC](https://www.ruby-forum.com/t/how-to-write-a-python-code-in-gnu/242436 "2015-06-24T03:47:30Z")
I was wondering if it is possible to create a python code in GNURadio instead of creating the flow chart? like instead of generating a python code like normal, is it possible to do it backwards , as in make a python c… --- ## [GNU Radio Live SDR Environment Snapshot 2015-0623 Released](https://www.ruby-forum.com/t/gnu-radio-live-sdr-environment-snapshot-2015-0623-released/242437)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 24, 2015, 3:14am UTC](https://www.ruby-forum.com/t/gnu-radio-live-sdr-environment-snapshot-2015-0623-released/242437 "2015-06-24T03:14:16Z")
GNU Radio Live SDR Environment Snapshot Release 2015-0623 This version of the ISO image is based on the current, unreleased master branch of GNU Radio and latest releases of third party software as of June 23, 2015. … --- ## [Re: FFT for FM Tx and Rx](https://www.ruby-forum.com/t/re-fft-for-fm-tx-and-rx/242435)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 23, 2015, 11:59pm UTC](https://www.ruby-forum.com/t/re-fft-for-fm-tx-and-rx/242435 "2015-06-23T23:59:43Z")
Hi, Marcus. Thanks for the reply. I use antennas for the transmitter and receivers, I forgot to mention I use two N210 USRP platforms with WBX daughterboards. When the transmitter is off, there is no other signal in … --- ## [Adding OOT Modules from Github](https://www.ruby-forum.com/t/adding-oot-modules-from-github/242434)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [June 23, 2015, 11:08pm UTC](https://www.ruby-forum.com/t/adding-oot-modules-from-github/242434 "2015-06-23T23:08:18Z")
Hello, I am trying to use the Burst PSK project that Tim O’Shea and Kiran K. developed and I am having trouble figuring out how to add the projects’ blocks into my version of Gnuradaio. Is there an easy way to add mu… --- ## [GNU Radio Fan Shop EU](https://www.ruby-forum.com/t/gnu-radio-fan-shop-eu/242432)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 23, 2015, 8:27pm UTC](https://www.ruby-forum.com/t/gnu-radio-fan-shop-eu/242432 "2015-06-23T20:27:38Z")
Everyone, finally, we also have a shop for GNU Radio merchandise in the EU (specifically, in Germany, with shipping options in the EU). Go ahead and shop your stuff here: http://gnuradio.spreadshirt.de/ All the merc… --- ## [PSK Mod Block](https://www.ruby-forum.com/t/psk-mod-block/242422)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [June 23, 2015, 6:53pm UTC](https://www.ruby-forum.com/t/psk-mod-block/242422 "2015-06-23T18:53:00Z")
Hello, I wanna use PSK Mod Block, but the ISI is annoying. Why PSK Mod Block have a it’s own ISI? And also is there anyway to disable the ISI from the block? – Sincerely, Surya A. University Al Azhar of Indonesia… --- ## [Verifying Turbo encoder output (was: Re: (no subject))](https://www.ruby-forum.com/t/verifying-turbo-encoder-output-was-re-no-subject/242425)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 23, 2015, 6:16pm UTC](https://www.ruby-forum.com/t/verifying-turbo-encoder-output-was-re-no-subject/242425 "2015-06-23T18:16:47Z")
Salija, since you are working with gr-trellis it is a good idea to run the examples given in the “examples” directory. You can always manually test the examples if you are willing to do the calculations yourself. A… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/242428)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 23, 2015, 6:04pm UTC](https://www.ruby-forum.com/t/no-subject/242428 "2015-06-23T18:04:30Z")
Hello, I am using the blocks from gr-trellis (pccc encoder and pccc decoder combo). can you tell to me how to check the output of pccc encoder and pccc decoder. I want to see the output in bits. also how t… --- ## [Hello](https://www.ruby-forum.com/t/hello/242417)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 23, 2015, 8:41am UTC](https://www.ruby-forum.com/t/hello/242417 "2015-06-23T08:41:54Z")
i have started using this GNUradio 3.7.7.1 recently ,some librarys are missing in it like graphical sinks and sinks .can anyone help me out that from where i have to download these packages and install it. regards m… --- ## [Remove portion of tagged stream](https://www.ruby-forum.com/t/remove-portion-of-tagged-stream/242415)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [June 23, 2015, 1:24am UTC](https://www.ruby-forum.com/t/remove-portion-of-tagged-stream/242415 "2015-06-23T01:24:22Z")
Hello all, Question 1: I have another “Does this exist already” question. I’m using the correlate access code block to tag a stream of data. Is there a block that exists that will identify a tag and then remove the … --- ## [Control Ports On/Off and Config file](https://www.ruby-forum.com/t/control-ports-on-off-and-config-file/242366)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [June 22, 2015, 8:50pm UTC](https://www.ruby-forum.com/t/control-ports-on-off-and-config-file/242366 "2015-06-22T20:50:23Z")
I set my gnuradio configuration file (located here: /usr/local/etc/gnuradio/conf.d/gnuradio-runtime.conf) to the following: \[PerfCounters\] on = True #False export = True #False clock = thread #clock = monotonic \[C… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/242412)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 22, 2015, 7:35pm UTC](https://www.ruby-forum.com/t/no-subject/242412 "2015-06-22T19:35:36Z")
Salija, can you specify which blocks are you working with? Are they in gr-trellis or in gr-fec? If the former I can help you (since I wrote most of it). best, Achilleas --- ## [Gnuradio-companion-3.7.7.1 debian package](https://www.ruby-forum.com/t/gnuradio-companion-3-7-7-1-debian-package/242372)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [June 22, 2015, 3:23pm UTC](https://www.ruby-forum.com/t/gnuradio-companion-3-7-7-1-debian-package/242372 "2015-06-22T15:23:13Z")
Hi, I need a GnuRadio debian package for version 3.7.7.1 to be installed in many different computers. I’ve tried creating it myself but I run into many difficulties. For example the command gnuradio-config-info --pre… --- ## [Issues using "Correlata and Sync" block, inside Hier\_block2](https://www.ruby-forum.com/t/issues-using-correlata-and-sync-block-inside-hier-block2/242376)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 22, 2015, 2:31pm UTC](https://www.ruby-forum.com/t/issues-using-correlata-and-sync-block-inside-hier-block2/242376 "2015-06-22T14:31:14Z")
Hi everybody, I am writing here because I am experiencing an issue (for some weeks now), and I can’t fixed it! I did some research about this problem, but I found nothing! I want to develop a hierarchical block, (c… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/242386)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 22, 2015, 11:16am UTC](https://www.ruby-forum.com/t/no-subject/242386 "2015-06-22T11:16:07Z")
Hello all, I am working with turbo encoder and decoder. is there any method to check and verify the output of pccc encoder. I want to see the the output of pccc encoder for corresponding binary input. is there any … --- ## [FFT for FM Tx and Rx](https://www.ruby-forum.com/t/fft-for-fm-tx-and-rx/242392)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 22, 2015, 10:57am UTC](https://www.ruby-forum.com/t/fft-for-fm-tx-and-rx/242392 "2015-06-22T10:57:25Z")
Hi,I implemented the FM transmitter and receiver from the tutorials (http://files.ettus.com/tutorials/labs/Lab\_1-5.pdf), the carrier frequency is 560 MHz, audio rate = 48 kHz, and frequency deviation = 5 kHz. My quest… --- ## [Does a block always \*have\* to return something?](https://www.ruby-forum.com/t/does-a-block-always-have-to-return-something/242395)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 22, 2015, 9:02am UTC](https://www.ruby-forum.com/t/does-a-block-always-have-to-return-something/242395 "2015-06-22T09:02:20Z")
Hi Will something like this in the work function be correct? self.consume(0, len(input\_items\[0\]) if (something): return else: out\[:\] = in0 \*\* 2 #example return len(output\_items\[0\]) When I say return nothing I mea… --- ## [Polyphase Channelizer Block - How do I deal with the GUI practicalities of 440 source ports?](https://www.ruby-forum.com/t/polyphase-channelizer-block-how-do-i-deal-with-the-gui-practicalities-of-440-source-ports/242397)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 22, 2015, 8:13am UTC](https://www.ruby-forum.com/t/polyphase-channelizer-block-how-do-i-deal-with-the-gui-practicalities-of-440-source-ports/242397 "2015-06-22T08:13:55Z")
Hi, I’m struggling with the Polyphase Channelizer Block when using a large number of channels in gnuradio-companion. In my application I would like to separate out 440 x 48kHz channels spanning 7MHz to 28MHz. Of the… --- ## [Grc icon issue and not saving python script after executing](https://www.ruby-forum.com/t/grc-icon-issue-and-not-saving-python-script-after-executing/242377)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [June 22, 2015, 7:19am UTC](https://www.ruby-forum.com/t/grc-icon-issue-and-not-saving-python-script-after-executing/242377 "2015-06-22T07:19:31Z")
Hello List, I have updated my gnu radio from 3.7.2.1 to 3.7.7.1. After the update when i am typing the “gnuradio-companion” it is getting open but the propriety icon is missing. I tried to make the new flow graph a… --- ## [Install GNURadio from Source](https://www.ruby-forum.com/t/install-gnuradio-from-source/242271)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 27\ **Last updated:** [June 22, 2015, 6:02am UTC](https://www.ruby-forum.com/t/install-gnuradio-from-source/242271 "2015-06-22T06:02:25Z")
Hi all, Ubuntu 14.04 I have installed uhd from source to /usr/local/bin without a problem. I then do the following: cd /usr/local/bin sudo git clone GitHub - gnuradio/gnuradio: GNU Radio – the Free and Open Software… --- ## [Cmake can't find 'gnuradio-runtime'](https://www.ruby-forum.com/t/cmake-cant-find-gnuradio-runtime/234428)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [June 21, 2015, 6:12pm UTC](https://www.ruby-forum.com/t/cmake-cant-find-gnuradio-runtime/234428 "2015-06-21T18:12:03Z")
Greetings I am also new in the gnuradio and recently I am working with him. I am flowing the instruction tutorial in gnuradio.org but when I am going to bulid my out of tree using cmake …/ He gives me the following e… --- ## [Adding Single Preamble Question](https://www.ruby-forum.com/t/adding-single-preamble-question/242385)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 19, 2015, 8:34pm UTC](https://www.ruby-forum.com/t/adding-single-preamble-question/242385 "2015-06-19T20:34:53Z")
Hello all, I am familiar with the stream mux and tagged stream mux blocks. What I need to do, however, is add a preamble to a stream of data only one time when the radio first starts, and then never again while it ru… --- ## [Re: problem with ofdm link](https://www.ruby-forum.com/t/re-problem-with-ofdm-link/242380)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 19, 2015, 6:33pm UTC](https://www.ruby-forum.com/t/re-problem-with-ofdm-link/242380 "2015-06-19T18:33:22Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [GRC bug - channel limitation in QT GUI Frequency Sink](https://www.ruby-forum.com/t/grc-bug-channel-limitation-in-qt-gui-frequency-sink/242381)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 19, 2015, 5:43pm UTC](https://www.ruby-forum.com/t/grc-bug-channel-limitation-in-qt-gui-frequency-sink/242381 "2015-06-19T17:43:07Z")
If you set the number of channels in the Freq sink block \> 10 (in my case 11), grc will throw an error. “if len(labels\[i\]) == 0: IndexError: list index out of range” Upon further investigation, the source code it ge… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=15) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=17)