# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=64 [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:** 65 --- ## [Sell my usrp n210](https://www.ruby-forum.com/t/sell-my-usrp-n210/230718)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 1, 2014, 2:50pm UTC](https://www.ruby-forum.com/t/sell-my-usrp-n210/230718 "2014-07-01T14:50:17Z")
Hi, After learning and enjoying from/with the usrp n210 very much, some changes in life/carreer made me sell one or two of my beloved usrp n210… For Sale: option one: 1 x USRP N210 with GPSDO duagterboard WBX (50… --- ## [Windows audio source problem](https://www.ruby-forum.com/t/windows-audio-source-problem/230715)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 1, 2014, 7:35am UTC](https://www.ruby-forum.com/t/windows-audio-source-problem/230715 "2014-07-01T07:35:45Z")
I installed gnuradio precompiled binary for windows from ettus, but audio source dose not capture anything. would you please help me. --- ## [Arbitrary ADC resolution at the receiver](https://www.ruby-forum.com/t/arbitrary-adc-resolution-at-the-receiver/230706)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [June 30, 2014, 5:47pm UTC](https://www.ruby-forum.com/t/arbitrary-adc-resolution-at-the-receiver/230706 "2014-06-30T17:47:54Z")
Hello everyone, I excuse myself on advance by my noob question… I have an N210 with an SBX front end, and I want to experiment with decoding signals at a lower resolution, rather than the default 12 bits provided by … --- ## [OFDM receiver error, FATAL: Missing a required length tag on port 0 at item #0](https://www.ruby-forum.com/t/ofdm-receiver-error-fatal-missing-a-required-length-tag-on-port-0-at-item-0/230710)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [June 30, 2014, 4:47pm UTC](https://www.ruby-forum.com/t/ofdm-receiver-error-fatal-missing-a-required-length-tag-on-port-0-at-item-0/230710 "2014-06-30T16:47:06Z")
Hi, I implemented OFDM receiver on USRP E110 using the OFDM receiver in examples in gnuradio’s files 3.7 and I added to it a chain to create OFDM transmitter: random source, OFDM transmitter, channel model, throttl… --- ## [Len\_tag\_key](https://www.ruby-forum.com/t/len-tag-key/230673)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 30, 2014, 11:37am UTC](https://www.ruby-forum.com/t/len-tag-key/230673 "2014-06-30T11:37:16Z")
Dear all , I use a flowgraph containing : File source , OFDM TX ,throttle, File sink (I will replace then the file sink by UHD sink to try with USRP) I got this error message FATAL: Missing a required length tag on … --- ## [Packet data transmission through USRP N210](https://www.ruby-forum.com/t/packet-data-transmission-through-usrp-n210/230689)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 30, 2014, 2:40am UTC](https://www.ruby-forum.com/t/packet-data-transmission-through-usrp-n210/230689 "2014-06-30T02:40:16Z")
Dear all, I’m trying to transmit data packets with variable length through GNURadio Companion v3.7.4 and USRP N210 (LTFX&LFRX). Firstly I found tunnel.py in repository but that file has not been updated for almost 3 … --- ## [Simulation with MAVLink protocol](https://www.ruby-forum.com/t/simulation-with-mavlink-protocol/230653)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 4\ **Last updated:** [June 29, 2014, 12:40pm UTC](https://www.ruby-forum.com/t/simulation-with-mavlink-protocol/230653 "2014-06-29T12:40:36Z")
Hello, I have some needs and I’d like to know if GnuRadio can help me with it. I have already read some material at GR website and I didn’t get the answer.I need to receive and send packets with a specific protocol ca… --- ## [Updates and FEC API](https://www.ruby-forum.com/t/updates-and-fec-api/230663)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 28, 2014, 4:46pm UTC](https://www.ruby-forum.com/t/updates-and-fec-api/230663 "2014-06-28T16:46:19Z")
Hey everyone, I’ve mentioned a few times recently the FEC API. It’ll be part of the 3.7.4 release (expected later next week), but I just wanted to point out a new post I wrote: Just a few updates on new features a… --- ## [Update Channel coding toolbox to Gnuradio 3.7.0](https://www.ruby-forum.com/t/update-channel-coding-toolbox-to-gnuradio-3-7-0/230591)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 5\ **Last updated:** [June 28, 2014, 4:45pm UTC](https://www.ruby-forum.com/t/update-channel-coding-toolbox-to-gnuradio-3-7-0/230591 "2014-06-28T16:45:07Z")
Deal all, Does anyone update the Channel Coding (https://www.cgran.org/wiki/chancoding) toolbox so that it can work in Gnuradio 3.7.0? I did try to install this toolbox. The installation was done but it do not appe… --- ## [UHD Error](https://www.ruby-forum.com/t/uhd-error/230656)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 28, 2014, 11:01am UTC](https://www.ruby-forum.com/t/uhd-error/230656 "2014-06-28T11:01:32Z")
Dear all, I am new to gnuradio. I am trying to run an experiment, but I got an error as follows: UHD Error: USB open failed: insufficient permissions. See the application notes for your device. Traceback (most rec… --- ## [\[coproc\] WG Call notes posted](https://www.ruby-forum.com/t/coproc-wg-call-notes-posted/230651)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 27, 2014, 9:40pm UTC](https://www.ruby-forum.com/t/coproc-wg-call-notes-posted/230651 "2014-06-27T21:40:26Z")
Just a heads up that I’ve posted my notes from the call on the wiki: http://gnuradio.org/redmine/projects/gnuradio/wiki/Call20140627 Doug --- ## [USRP1: Error: Connection refused](https://www.ruby-forum.com/t/usrp1-error-connection-refused/230636)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 27, 2014, 11:24am UTC](https://www.ruby-forum.com/t/usrp1-error-connection-refused/230636 "2014-06-27T11:24:55Z")
Dear all, I’ve reinstalled gnuradio 3.7.0 and UHD 003.007.001. Now I got this error when connecting USRP to my PC and running some commands: sudo uhd\_usrp\_probe Error: linux; GNU C++ version 4.6.3; Boost\_104601; U… --- ## [\[coproc\] WG call tomorrow - June 27](https://www.ruby-forum.com/t/coproc-wg-call-tomorrow-june-27/230630)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 26, 2014, 10:26pm UTC](https://www.ruby-forum.com/t/coproc-wg-call-tomorrow-june-27/230630 "2014-06-26T22:26:18Z")
Just a reminder that the Co-Processors Working Group call is scheduled for tomorrow, June 27 at 2pm EDT / 6pm UTC. I’ve put an initial agenda up on the gnuradio wiki. If anyone planning to participate would like to a… --- ## [Proper setting for sample delay for polyphase arbitrary resampler?](https://www.ruby-forum.com/t/proper-setting-for-sample-delay-for-polyphase-arbitrary-resampler/230574)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 3\ **Last updated:** [June 26, 2014, 10:10pm UTC](https://www.ruby-forum.com/t/proper-setting-for-sample-delay-for-polyphase-arbitrary-resampler/230574 "2014-06-26T22:10:49Z")
Hi, I have a Polyphase Arbitrary Resampler block in a flow graph and I want to set the “Sample Delay” parameter so GnuRadio delays tags properly. With the following parameters: Input Sample Rate: Fs Resampling Rate:… --- ## [AM Stereo (C-QUAM) Transmitter](https://www.ruby-forum.com/t/am-stereo-c-quam-transmitter/234785)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [June 26, 2014, 9:26pm UTC](https://www.ruby-forum.com/t/am-stereo-c-quam-transmitter/234785 "2014-06-26T21:26:46Z")
I have finished work on a CQUAM https://en.wikipedia.org/wiki/C-QUAM transmitter in GNURadio. CQUAM was among many competing standards for Stereo AM radio, and is still in use around the world. I didn’t see much fo a… --- ## [Control Port : Ctrlport Key called with unregistered key](https://www.ruby-forum.com/t/control-port-ctrlport-key-called-with-unregistered-key/230598)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 7\ **Last updated:** [June 26, 2014, 8:57pm UTC](https://www.ruby-forum.com/t/control-port-ctrlport-key-called-with-unregistered-key/230598 "2014-06-26T20:57:01Z")
I was trying to use gr-perf-monitorx while running Bastian’s gr-ieee80211 project. I was encountering the following error : { unknown = /home/harsha\_sdr/.Repos/gnuradio/gnuradio-runtime/include/gnuradio/rpcserver\_ic… --- ## [\[GSoC\] Co-Processors Update #4](https://www.ruby-forum.com/t/gsoc-co-processors-update-4/234786)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [June 26, 2014, 8:54pm UTC](https://www.ruby-forum.com/t/gsoc-co-processors-update-4/234786 "2014-06-26T20:54:03Z")
Hello community, Sorry this update is so late. I spent about a week walking down the wrong path so I’ve been spending days and nights trying to get an actual update. Logistical: Midterm evaluations due tomorrow Co… --- ## [GSoC14 gr-trellis update](https://www.ruby-forum.com/t/gsoc14-gr-trellis-update/230589)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 3\ **Last updated:** [June 26, 2014, 9:51am UTC](https://www.ruby-forum.com/t/gsoc14-gr-trellis-update/230589 "2014-06-26T09:51:00Z")
\-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hey everyone, right in time for Midtermevalutaions I have a bigger update for you. Viterbi Decoder is now fully Volkified, but results are a bit meh :confused: You can r… --- ## [\[GSoC-14\] measurement toolbox update](https://www.ruby-forum.com/t/gsoc-14-measurement-toolbox-update/230611)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 26, 2014, 2:28am UTC](https://www.ruby-forum.com/t/gsoc-14-measurement-toolbox-update/230611 "2014-06-26T02:28:23Z")
\-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello Community! As the midterm evaluations are upon us, I should take the time to share my progress (or lack thereof) with you. Wishing that more of my original plans w… --- ## [Re: Sending/Receiving UDP Data Over Internet](https://www.ruby-forum.com/t/re-sending-receiving-udp-data-over-internet/230609)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 26, 2014, 1:14am UTC](https://www.ruby-forum.com/t/re-sending-receiving-udp-data-over-internet/230609 "2014-06-26T01:14:20Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [ImportError: cannot import name channels](https://www.ruby-forum.com/t/importerror-cannot-import-name-channels/230606)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 25, 2014, 8:25pm UTC](https://www.ruby-forum.com/t/importerror-cannot-import-name-channels/230606 "2014-06-25T20:25:33Z")
Hi, I am getting the following error ImportError: cannot import name channels… when I run a python script. I added the following line to a code from gnuradio import channels First I made a simulation model using gn… --- ## [Sound card sampling rate question](https://www.ruby-forum.com/t/sound-card-sampling-rate-question/230590)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 2\ **Last updated:** [June 25, 2014, 8:04pm UTC](https://www.ruby-forum.com/t/sound-card-sampling-rate-question/230590 "2014-06-25T20:04:01Z")
I am facing a funny issue: I want to use the sound card for analyzing the spectral response of a quartz tuning fork at 32768 Hz. I just happened to discover that my laptop (Panasonic CF-19) has a sound card able to s… --- ## [\[GSoC\] gr-radar: GUI](https://www.ruby-forum.com/t/gsoc-gr-radar-gui/230599)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 25, 2014, 2:48pm UTC](https://www.ruby-forum.com/t/gsoc-gr-radar-gui/230599 "2014-06-25T14:48:11Z")
Hi! The radar toolbox has new features! GUIs for scatter plots of two target attributes and time plots of a single target attribute are implemented. All GUIs are real time and multi target capable. Check out my blog … --- ## [PSK modulator output](https://www.ruby-forum.com/t/psk-modulator-output/230588)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 25, 2014, 10:35am UTC](https://www.ruby-forum.com/t/psk-modulator-output/230588 "2014-06-25T10:35:56Z")
Hi What kind of sink can be used to analyse the outpt of a PSK modulator. I am transmitting a text file and is trying to retrieve and analyse using file sink. --- ## [RAW source](https://www.ruby-forum.com/t/raw-source/230476)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 15\ **Last updated:** [June 25, 2014, 5:36am UTC](https://www.ruby-forum.com/t/raw-source/230476 "2014-06-25T05:36:53Z")
Hi, I want to capture packets coming from Twinkle Soft phone in gnuradio, these packet are RTP packets . But in gnuradio , there is only UDP or TCP source ! I can’t find Raw source to correspond to the RTP packets. … --- ## [Removing GNU Radio Throughly](https://www.ruby-forum.com/t/removing-gnu-radio-throughly/230581)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 6\ **Last updated:** [June 25, 2014, 3:03am UTC](https://www.ruby-forum.com/t/removing-gnu-radio-throughly/230581 "2014-06-25T03:03:19Z")
Just recently I decided to update my old build of GNU Radio (3.6 release from Dec '13) to the newest one. Due to overly conservative and arbitrary network policies, my CentOS machines are forbidden to interact with th… --- ## [Greetings!](https://www.ruby-forum.com/t/greetings/230583)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 25, 2014, 2:24am UTC](https://www.ruby-forum.com/t/greetings/230583 "2014-06-25T02:24:05Z")
Greetings! I’m new to SDR. I bought two GNU Radio X300, since I am trying to do Wifi in frequencies where no one else transmits.Like this I will get super fast speeds. I heard the GNU Radio X300 is the fastest SDR you… --- ## [GMSK\_DEMOD question, please help me :)](https://www.ruby-forum.com/t/gmsk-demod-question-please-help-me/230578)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 0\ **Last updated:** [June 24, 2014, 11:11pm UTC](https://www.ruby-forum.com/t/gmsk-demod-question-please-help-me/230578 "2014-06-24T23:11:57Z")
Hello everyone, I am an intern this summer doing signal demodulation and decoding. I am using GNU Radio software to demodulate the 9600 bps 12.5KHz wide GMSK modulated signal. Here is my process: I get the data fro… --- ## [Issue with stream to vector](https://www.ruby-forum.com/t/issue-with-stream-to-vector/230568)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [June 24, 2014, 1:58pm UTC](https://www.ruby-forum.com/t/issue-with-stream-to-vector/230568 "2014-06-24T13:58:50Z")
Hi I’m trying to find IFFT of a stream of complex numbers and used the following flowchart. its constantly saying Source IO size “8” does not match sink IO size “4096”. How to overcome that error… Regards Sreena --- ## [QT Sink center frequency not working](https://www.ruby-forum.com/t/qt-sink-center-frequency-not-working/230512)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 3\ **Last updated:** [June 24, 2014, 12:47pm UTC](https://www.ruby-forum.com/t/qt-sink-center-frequency-not-working/230512 "2014-06-24T12:47:28Z")
Setting the center frequency in the QT Sink doesn’t seem to work. It stays centered at 0 Hz. Center frequency seems to work fine with regular QT Frequency Sink. GNU Radio version is v3.7.4git-332-g34ee3b7d. I attached… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=63) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=65)