# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=19 [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:** 20 --- ## [Parser in python](https://www.ruby-forum.com/t/parser-in-python/242207)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 4, 2015, 11:44am UTC](https://www.ruby-forum.com/t/parser-in-python/242207 "2015-06-04T11:44:10Z")
Hi I am new to GNURADIO and are trying to have my python script take a file as a parameter and making gnuradio read this file and decode the message. But it reads the wav file in the init procedure, so when I am call… --- ## [USRP underflow issue](https://www.ruby-forum.com/t/usrp-underflow-issue/242205)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 4, 2015, 10:53am UTC](https://www.ruby-forum.com/t/usrp-underflow-issue/242205 "2015-06-04T10:53:04Z")
Hi everyone, I’m new to Gnuradio and I have some problems with USRP N210 with WBX daughterboards. I send data coming from udp socket to USRP and I am encountering underflow issue. I think that problem is due to the r… --- ## [Problem with ofdm bandwidth and sampling rate](https://www.ruby-forum.com/t/problem-with-ofdm-bandwidth-and-sampling-rate/242187)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [June 4, 2015, 8:59am UTC](https://www.ruby-forum.com/t/problem-with-ofdm-bandwidth-and-sampling-rate/242187 "2015-06-04T08:59:44Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Flashing USRP 2942R firmware](https://www.ruby-forum.com/t/flashing-usrp-2942r-firmware/242200)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 3, 2015, 10:09pm UTC](https://www.ruby-forum.com/t/flashing-usrp-2942r-firmware/242200 "2015-06-03T22:09:32Z")
Hi Will I be able to flash the USRP 2942R firmware to use Gnuradio and then reflash it later to be able to use it again in Labview? I just want to be 100% sure that I can go back and forth without bricking my board. --- ## [Music algorithm with multiple snapshots](https://www.ruby-forum.com/t/music-algorithm-with-multiple-snapshots/242198)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 3, 2015, 9:04pm UTC](https://www.ruby-forum.com/t/music-algorithm-with-multiple-snapshots/242198 "2015-06-03T21:04:08Z")
Hi, I’ve been trying to do direction of arrival, and have been playing around with both RMusic from gr-specest and the DOA block from gr-baz. Is it possible (with either block) to use multiple snapshots? Thanks, -… --- ## [SOCIS project update 1](https://www.ruby-forum.com/t/socis-project-update-1/242197)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 3, 2015, 7:46pm UTC](https://www.ruby-forum.com/t/socis-project-update-1/242197 "2015-06-03T19:46:26Z")
Hey GNU Radio community! Work on POLAR codes for GNU Radio has begun. This week I’m working on Python implementations for encoders and decoders. So far I have an encoder working and an Successive Cancellation decoder. … --- ## [Curious about Feature](https://www.ruby-forum.com/t/curious-about-feature/242193)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [June 3, 2015, 7:35pm UTC](https://www.ruby-forum.com/t/curious-about-feature/242193 "2015-06-03T19:35:20Z")
Hi all, I just had this idea and would like to know if there is any major impediment to doing it. Could I add a little colored rectangle next to each input and output port that would change from green to yellow to re… --- ## [Long preambles in the Gr-ieee 802.11 a/g/p transceiver](https://www.ruby-forum.com/t/long-preambles-in-the-gr-ieee-802-11-a-g-p-transceiver/242190)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [June 3, 2015, 3:55pm UTC](https://www.ruby-forum.com/t/long-preambles-in-the-gr-ieee-802-11-a-g-p-transceiver/242190 "2015-06-03T15:55:38Z")
Hello, I am using the gr-ieee802-11 module and want to analyse the long preambles in the 11p standard. Going through the code I am getting the feeling that the long preambles might be found in the ofdm\_sync\_long.cc(… --- ## [Stream ID in virtual source Block](https://www.ruby-forum.com/t/stream-id-in-virtual-source-block/242184)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [June 3, 2015, 3:39pm UTC](https://www.ruby-forum.com/t/stream-id-in-virtual-source-block/242184 "2015-06-03T15:39:52Z")
Hii What should i input in the “stream ID” field of Virtual Source block? --- ## [Wxgui\_fft sink](https://www.ruby-forum.com/t/wxgui-fft-sink/242176)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [June 2, 2015, 9:05pm UTC](https://www.ruby-forum.com/t/wxgui-fft-sink/242176 "2015-06-02T21:05:46Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [USRP2/Gnuradio - satellite application](https://www.ruby-forum.com/t/usrp2-gnuradio-satellite-application/242155)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [June 2, 2015, 8:00pm UTC](https://www.ruby-forum.com/t/usrp2-gnuradio-satellite-application/242155 "2015-06-02T20:00:55Z")
Good evening, I will appreciate your help and guidance. since 3 weeks I’m trying to implement an application to derive the sky noise and attenuation from a beacon satellite signal. Using gnuardio and USRP2 (Ettus N… --- ## [Regular FM radio fine, POCSAG horrible](https://www.ruby-forum.com/t/regular-fm-radio-fine-pocsag-horrible/242165)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 19\ **Last updated:** [June 2, 2015, 5:54pm UTC](https://www.ruby-forum.com/t/regular-fm-radio-fine-pocsag-horrible/242165 "2015-06-02T17:54:39Z")
Hi Guys, I compiled gnuradio for my ODROID ARM platform, and I can listen to regular wideband radio just fine. I am using a Generic RTL2832U with Rafael Micro R820T tuner. The radio quality is fine, and even when us… --- ## [Issues of synchronizing two USRP N210s](https://www.ruby-forum.com/t/issues-of-synchronizing-two-usrp-n210s/242175)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 2, 2015, 4:37pm UTC](https://www.ruby-forum.com/t/issues-of-synchronizing-two-usrp-n210s/242175 "2015-06-02T16:37:31Z")
Hi, I met the following errors when I try to synchronize two USRP N210s. Both N210s are fed with 10MHz reference clock and 1 PPS from an OctoClock. The two N210s are connected via a MIMO cable as well. One N210 is c… --- ## [Fw: Re: Problem with volk and fftw memory alignment](https://www.ruby-forum.com/t/fw-re-problem-with-volk-and-fftw-memory-alignment/242167)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [June 1, 2015, 10:09pm UTC](https://www.ruby-forum.com/t/fw-re-problem-with-volk-and-fftw-memory-alignment/242167 "2015-06-01T22:09:51Z")
Forgot to copy this to the list - I think the bug is fixed Thanks for your help. I’m quite new to contibuting back into git-hosted projects, so forgive me if I’ve got it wrong… The last commit I pulled from github/gnu… --- ## [Header/Payload Demux Bug Fix](https://www.ruby-forum.com/t/header-payload-demux-bug-fix/242163)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [June 1, 2015, 9:04pm UTC](https://www.ruby-forum.com/t/header-payload-demux-bug-fix/242163 "2015-06-01T21:04:24Z")
Martin et. al., The fix that makes this block work for us in any scenario, is to add a break statement at the end of every case statement (don’t allow the fall through’s to happen). This leads me to believe the sourc… --- ## [HAM RADIO Friedrichshafen anyone?](https://www.ruby-forum.com/t/ham-radio-friedrichshafen-anyone/242164)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 1, 2015, 6:37pm UTC](https://www.ruby-forum.com/t/ham-radio-friedrichshafen-anyone/242164 "2015-06-01T18:37:46Z")
Hi, Will some gnuradioers visit the German Friedrichshafen ham fest? http://www.hamradio-friedrichshafen.de/ham-en/ There is also some sdr context: My wife and me will be there, as every year :slight\_smile: Ralph. … --- ## [Burst transmission USRP N210 + WBX](https://www.ruby-forum.com/t/burst-transmission-usrp-n210-wbx/242160)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [June 1, 2015, 5:06pm UTC](https://www.ruby-forum.com/t/burst-transmission-usrp-n210-wbx/242160 "2015-06-01T17:06:50Z")
Hi everyone, I am writing here because I need some help with GNUradio and the UHD driver. My problem is: I want to send burst packet to USRP sink block. If I use the first flow-graph (see picture #1), all work fine.… --- ## [What if noutput\_itmes is too short?](https://www.ruby-forum.com/t/what-if-noutput-itmes-is-too-short/242128)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [June 1, 2015, 4:01pm UTC](https://www.ruby-forum.com/t/what-if-noutput-itmes-is-too-short/242128 "2015-06-01T16:01:11Z")
I am trying to remove preamble and start frame delimiter from a frame and only the payload will be passed to the next block. While in debugging, ninput\_items is 7742, and noutput\_items is 4096, for instance. An offse… --- ## [Using theme with QTGUI qss files makes transition lines between points on QT GUI Constellation Sink](https://www.ruby-forum.com/t/using-theme-with-qtgui-qss-files-makes-transition-lines-between-points-on-qt-gui-constellation-sink/242149)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 31, 2015, 9:48pm UTC](https://www.ruby-forum.com/t/using-theme-with-qtgui-qss-files-makes-transition-lines-between-points-on-qt-gui-constellation-sink/242149 "2015-05-31T21:48:48Z")
The new GRC theme system using qss files looks pretty neat and seems very user configurable. Thanks. To use this, with my build-gnuradio installed setup, I had to create a new file under my home user folder at /home… --- ## [UHD on Windows 7](https://www.ruby-forum.com/t/uhd-on-windows-7/242152)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 31, 2015, 7:39pm UTC](https://www.ruby-forum.com/t/uhd-on-windows-7/242152 "2015-05-31T19:39:43Z")
Hello I’m trying to figure out uhd on Windows 7. I install uhd\_003.008.003-release\_Win64\_VS2013.exe and install Microsoft visual C++ redistributable ver 12.0.30501 and when I try uhd\_find\_devices command i have respo… --- ## [Getting together in Korea to talk SDR](https://www.ruby-forum.com/t/getting-together-in-korea-to-talk-sdr/242150)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 31, 2015, 7:22pm UTC](https://www.ruby-forum.com/t/getting-together-in-korea-to-talk-sdr/242150 "2015-05-31T19:22:46Z")
Friends in the Seoul area, I will be visiting between June 2nd and June 7th, and will have some free time. I would love to get together with USRP and GNU Radio users while I’m there. I’d be up for anything from talk… --- ## [Re: SDRA, Programme complete](https://www.ruby-forum.com/t/re-sdra-programme-complete/242151)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 31, 2015, 7:00pm UTC](https://www.ruby-forum.com/t/re-sdra-programme-complete/242151 "2015-05-31T19:00:34Z")
Dear Iluta, in SDRA we don’t have a specific talk on extraterrestrial radio applications, but the entire HAMRADIO event is on Space Applicatons. So it depends on which event you plan to attend. Generally you can say … --- ## [Re: \[trellis - ofdm\]](https://www.ruby-forum.com/t/re-trellis-ofdm/242147)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 31, 2015, 6:23pm UTC](https://www.ruby-forum.com/t/re-trellis-ofdm/242147 "2015-05-31T18:23:46Z")
Hello Rita’s pcf I’m trying to use the trellis encoder with the ofdm mod and the ofdm demod too. Could you please tell me why it can’t be used just by connecting the trellis encoder’s output with the ofdm mod’s inp… --- ## [SDRA, Programme complete](https://www.ruby-forum.com/t/sdra-programme-complete/242120)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 31, 2015, 5:48pm UTC](https://www.ruby-forum.com/t/sdra-programme-complete/242120 "2015-05-31T17:48:08Z")
Dear List, please note that the programme of the SDRA-2015 is now complete. We have also finalized the timetable now. I’ll be happy to welcome many of you at Friedrichshafen! The SDRA will take place on June 27. v… --- ## [Question on state machine implementation in GNURadio](https://www.ruby-forum.com/t/question-on-state-machine-implementation-in-gnuradio/242148)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 31, 2015, 4:48pm UTC](https://www.ruby-forum.com/t/question-on-state-machine-implementation-in-gnuradio/242148 "2015-05-31T16:48:33Z")
Hi I was just wondering if it is possible to implement a state machine logic using GNURadio. Where each state is a block and incoming data passes through these states. I want to be able to control which block gets e… --- ## [Problem with receiver section in BPSK](https://www.ruby-forum.com/t/problem-with-receiver-section-in-bpsk/242139)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 31, 2015, 1:07pm UTC](https://www.ruby-forum.com/t/problem-with-receiver-section-in-bpsk/242139 "2015-05-31T13:07:09Z")
Hello everyone, I tried to implement bpsk system.I am successful with the transmission part but I am able to see the ISI when I am observing the constellation at the transmitter side. I tried to design the receiver … --- ## [Diagnosing the cause of D's](https://www.ruby-forum.com/t/diagnosing-the-cause-of-ds/242131)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 31, 2015, 12:35am UTC](https://www.ruby-forum.com/t/diagnosing-the-cause-of-ds/242131 "2015-05-31T00:35:57Z")
Hi all, I need some help determining the cause of D’s being displayed from my N210 device. I know it means GNU Radio is not consuming the samples from my laptops Ethernet socket buffer fast enough, causing the USRP t… --- ## [Using Out-of-Tree module from C++ Application](https://www.ruby-forum.com/t/using-out-of-tree-module-from-c-application/228941)
**Author:** [@Michael\_Buettner](https://www.ruby-forum.com/u/Michael_Buettner)\ **Replies:** 3\ **Last updated:** [May 30, 2015, 10:06am UTC](https://www.ruby-forum.com/t/using-out-of-tree-module-from-c-application/228941 "2015-05-30T10:06:31Z")
I am trying to use an out of tree module (built according to the “Out-of-tree modules” documentation) from a C++ application. The module is named “reader”, and the block I’m trying to use is “command\_gate\_cc”. I can … --- ## [Re: Integration of python's time.time() and work() calls](https://www.ruby-forum.com/t/re-integration-of-pythons-time-time-and-work-calls/242135)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 29, 2015, 11:00pm UTC](https://www.ruby-forum.com/t/re-integration-of-pythons-time-time-and-work-calls/242135 "2015-05-29T23:00:47Z")
Hi Marcus, Thank you for your patient replies. Last question. Your block is asked “I’d like to ask you to produce 512 items. How much input do you need?”. If your block then says “I need 400 items”, This means… --- ## [How to start and stop recording without exiting the flowgraph](https://www.ruby-forum.com/t/how-to-start-and-stop-recording-without-exiting-the-flowgraph/242066)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [May 29, 2015, 10:42pm UTC](https://www.ruby-forum.com/t/how-to-start-and-stop-recording-without-exiting-the-flowgraph/242066 "2015-05-29T22:42:41Z")
Hi all, I would like to use two filesink blocks to record signals from two USRP:s with MIMO Cable. I am interested in the phase offset of an incoming signal so I first need to calibrate and then start recording. I h… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=18) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=20)