# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=72 [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:** 73 --- ## [OFDM transmitter and receiver in one USRP N200-bit error](https://www.ruby-forum.com/t/ofdm-transmitter-and-receiver-in-one-usrp-n200-bit-error/241195)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 18, 2014, 12:14am UTC](https://www.ruby-forum.com/t/ofdm-transmitter-and-receiver-in-one-usrp-n200-bit-error/241195 "2014-05-18T00:14:15Z")
Hello, please help me, does anyone know why does not this involvement? I run it on the device Ettus USRP N200 you do not know accurate settings blocks? --- ## [Low frequency in GRC](https://www.ruby-forum.com/t/low-frequency-in-grc/241155)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [May 17, 2014, 3:55pm UTC](https://www.ruby-forum.com/t/low-frequency-in-grc/241155 "2014-05-17T15:55:18Z")
I am using GNU Radio Companion 3.7.3…when i set the frequency of my signal source to low values(in Hz or kHz),i get no signal on my scope or fft sink?? --- ## [aUaU FM receiver](https://www.ruby-forum.com/t/auau-fm-receiver/241184)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [May 17, 2014, 1:03am UTC](https://www.ruby-forum.com/t/auau-fm-receiver/241184 "2014-05-17T01:03:17Z")
Hi, I built a FM receiver working with a LiveUSB and a USRPB100 device. It worked fine, but when I installed Ubuntu and GNURadio in a virtual machine, the audio is distorted. The console types aU letters. But I gener… --- ## [MSF/DCF/RBU Time Station Receiver Implementation](https://www.ruby-forum.com/t/msf-dcf-rbu-time-station-receiver-implementation/241167)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 16, 2014, 7:39pm UTC](https://www.ruby-forum.com/t/msf-dcf-rbu-time-station-receiver-implementation/241167 "2014-05-16T19:39:33Z")
Hi Everyone, In recent days I had the idea to plug my LF preamp and antenna into my 192k Soundcard. Even with Nyquist being his usual pain, that still gives me DC to 96kHz. Perfect for certain time stations … --- ## [A silly question about the sream to vector block](https://www.ruby-forum.com/t/a-silly-question-about-the-sream-to-vector-block/241188)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 16, 2014, 6:22pm UTC](https://www.ruby-forum.com/t/a-silly-question-about-the-sream-to-vector-block/241188 "2014-05-16T18:22:44Z")
Hi guys, While i was trying to figure out what the stream to vector block does,I understood that if I choose for example nitems=1024 and vector length=1,I get in the output 1024 vectors of 1 item each.And when I was … --- ## [Not responding B100](https://www.ruby-forum.com/t/not-responding-b100/246219)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [May 16, 2014, 6:20pm UTC](https://www.ruby-forum.com/t/not-responding-b100/246219 "2014-05-16T18:20:16Z")
Hi List, My B100 suddenly stopped responding to UHD init. It appears that the USB interface actually lost its ability to identify as a device. Here below, you can find the output of the fedora “messages” log for th… --- ## [Problems with Packet Encoder - Packed to unpacked - Unpack k bits - Packet Decoder](https://www.ruby-forum.com/t/problems-with-packet-encoder-packed-to-unpacked-unpack-k-bits-packet-decoder/241185)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 16, 2014, 5:56pm UTC](https://www.ruby-forum.com/t/problems-with-packet-encoder-packed-to-unpacked-unpack-k-bits-packet-decoder/241185 "2014-05-16T17:56:56Z")
Hi everybody, I’m currently working with some modulations (M-QAM, M-PSK) and my results are almost the same for all of them. I’m sending a wav file which is a 4 minutes song and in reception I get just few seconds of … --- ## [Ice-related Build Problem](https://www.ruby-forum.com/t/ice-related-build-problem/241174)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 16, 2014, 3:07pm UTC](https://www.ruby-forum.com/t/ice-related-build-problem/241174 "2014-05-16T15:07:49Z")
Building GR with the latest pybombs completes successfully, but when calling a GR binary, there’s an error about ICE (which built without problems): $:~/pybombs/src/gnuradio/build$ gnuradio-config-info -v gnuradio-co… --- ## [Uhd.tune\_request\_t](https://www.ruby-forum.com/t/uhd-tune-request-t/241179)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 16, 2014, 11:00am UTC](https://www.ruby-forum.com/t/uhd-tune-request-t/241179 "2014-05-16T11:00:17Z")
Hi I would like to move the LO frequency. I have read that I could do this by uhd.tune\_request\_t(fc, offset). How can I execute this? Is this a file somewhere? Thanks --- ## [B200 clock calibration](https://www.ruby-forum.com/t/b200-clock-calibration/241132)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 16, 2014, 10:27am UTC](https://www.ruby-forum.com/t/b200-clock-calibration/241132 "2014-05-16T10:27:37Z")
I try to get B200 to work with OpenBTS and I see some frequency offset in the internal reference clock. Does anyone know if the numbers I get from kalibrate, could cause phones not to be able to register to OpenBTS? … --- ## [Installed ieee\_802\_15\_4 do following modifications](https://www.ruby-forum.com/t/installed-ieee-802-15-4-do-following-modifications/241175)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 16, 2014, 8:47am UTC](https://www.ruby-forum.com/t/installed-ieee-802-15-4-do-following-modifications/241175 "2014-05-16T08:47:26Z")
On Sun, May 11, 2014 at 8:55 PM, Bastian B. removed\_email\_address@domain.invalidwrote: Do you have a dated GNU Radio installation that does not support the REQUIRED\_COMPONENTS in cmake? you could do this in lib/CMake… --- ## [LTE and USRP](https://www.ruby-forum.com/t/lte-and-usrp/241161)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [May 16, 2014, 8:07am UTC](https://www.ruby-forum.com/t/lte-and-usrp/241161 "2014-05-16T08:07:29Z")
Hello, I considering the possibility to purchase some USRP boards. My objective is to work with open source code of LTE. I’ve seen the OpenLTE project (http://openlte.sourceforge.net/, openLTE download | SourceForge… --- ## [How to change a flowgraph in c++ dynamically](https://www.ruby-forum.com/t/how-to-change-a-flowgraph-in-c-dynamically/241104)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [May 16, 2014, 2:34am UTC](https://www.ruby-forum.com/t/how-to-change-a-flowgraph-in-c-dynamically/241104 "2014-05-16T02:34:30Z")
Hi everybody, I was wonder why I can’t make a class of topblock in c++ like in python as said here: http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsWritePythonApplications Then I think, I can control the… --- ## [Dev Call May Live Broadcast](https://www.ruby-forum.com/t/dev-call-may-live-broadcast/241158)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 15, 2014, 7:07pm UTC](https://www.ruby-forum.com/t/dev-call-may-live-broadcast/241158 "2014-05-15T19:07:46Z")
Follow the dev call on: Cheers, M --- ## [Developer call live now!](https://www.ruby-forum.com/t/developer-call-live-now/241163)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 15, 2014, 7:07pm UTC](https://www.ruby-forum.com/t/developer-call-live-now/241163 "2014-05-15T19:07:46Z")
Philip --- ## [Re: B200 clock calibration](https://www.ruby-forum.com/t/re-b200-clock-calibration/241157)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 15, 2014, 5:18pm UTC](https://www.ruby-forum.com/t/re-b200-clock-calibration/241157 "2014-05-15T17:18:55Z")
Hi, In case we use on-board oscillator , how is ADF4001 configured? Does CP (pin20) output affect the VCXO\_Tune ? Is it possible to control this chip directly from the command line? --- ## [Grc-mimo setup](https://www.ruby-forum.com/t/grc-mimo-setup/241160)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 7\ **Last updated:** [May 15, 2014, 4:03pm UTC](https://www.ruby-forum.com/t/grc-mimo-setup/241160 "2014-05-15T16:03:15Z")
Hello all: Environment: 2 usrp N210,mimo cable(they connect with each other and share the Ethernet) And i use the gnuradio companion to set up a very simple example.And the example is attached on the emai… --- ## [Root rasied cosine parameters issue](https://www.ruby-forum.com/t/root-rasied-cosine-parameters-issue/241164)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 15, 2014, 2:27pm UTC](https://www.ruby-forum.com/t/root-rasied-cosine-parameters-issue/241164 "2014-05-15T14:27:47Z")
Hi all, I have problem with pulse shaping RRC filter parameters when I set the parameters as interpolation=4 Gain=nfilts sample rate=1 symbol rate=1 Alpha=0.5 Num Taps=11spsnfilts (nfilts = 32, sps=4) bu… --- ## [Saving raw data after correct frame reception](https://www.ruby-forum.com/t/saving-raw-data-after-correct-frame-reception/240592)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [May 15, 2014, 8:16am UTC](https://www.ruby-forum.com/t/saving-raw-data-after-correct-frame-reception/240592 "2014-05-15T08:16:24Z")
hi all guys, I would like to be able to store raw data into file after correct frame reception. For this reason I suppose there should be a block that buffers raw data and wait for the trigger to store into file. Th… --- ## [OFDM cyclic prefixer](https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/241125)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 15, 2014, 2:13am UTC](https://www.ruby-forum.com/t/ofdm-cyclic-prefixer/241125 "2014-05-15T02:13:55Z")
Hello, My name is Yuri. ​ I very new to GNU Radio, and I’m using GRC 3.7.1.​ I am doing a research, and I need to modulate specific signal in OFDM. I would like to insert cyclic prefix (or guard interval in my projec… --- ## [\[VOLK WG\] scheduling meeting](https://www.ruby-forum.com/t/volk-wg-scheduling-meeting/241149)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 14, 2014, 11:18pm UTC](https://www.ruby-forum.com/t/volk-wg-scheduling-meeting/241149 "2014-05-14T23:18:49Z")
Hi all, It’s been a while since we’ve had a VOLK working group call, and I think there’s some things worth discussing that have built up. If you’re interested in attending put in available hours here: In the next da… --- ## [Re: B200 clock calibration](https://www.ruby-forum.com/t/re-b200-clock-calibration/241143)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 14, 2014, 11:11pm UTC](https://www.ruby-forum.com/t/re-b200-clock-calibration/241143 "2014-05-14T23:11:26Z")
2 kHz offset is within tolerance for 1900 MHz. Locking to a stable 10 MHz reference, generally an OCXO or GPSDO, is the recommended approach. I applied external 10MHz reference, the best I had at hand. Now kalibrat… --- ## [Polyphase clock synchronization issue](https://www.ruby-forum.com/t/polyphase-clock-synchronization-issue/241114)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [May 14, 2014, 4:34pm UTC](https://www.ruby-forum.com/t/polyphase-clock-synchronization-issue/241114 "2014-05-14T16:34:19Z")
Hi all, I have a problem here with polyphase clock synchronization block when i set the output samples per symbol to one the constellation have much more ISI and noise and when output sps value is 2 the constellatio… --- ## [Message Passing](https://www.ruby-forum.com/t/message-passing/241127)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 12\ **Last updated:** [May 14, 2014, 1:08pm UTC](https://www.ruby-forum.com/t/message-passing/241127 "2014-05-14T13:08:09Z")
Dear gurus, I am learning gnuradio Message Passing feature, but couldn’t get desirable result. The Message seems published successfully, but not subscribed by the Message receiver. How to correct the error …? The… --- ## [How to pass a large number of items between blocks?](https://www.ruby-forum.com/t/how-to-pass-a-large-number-of-items-between-blocks/241115)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [May 14, 2014, 11:30am UTC](https://www.ruby-forum.com/t/how-to-pass-a-large-number-of-items-between-blocks/241115 "2014-05-14T11:30:55Z")
Hi, I recently encountered a problem with the large number of items. I wanna pass about 75000 items from one block to the another. I thought that I could do this with setting the min of output items in the constructor… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/241133)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 14, 2014, 11:17am UTC](https://www.ruby-forum.com/t/no-subject/241133 "2014-05-14T11:17:22Z")
I am confused about the terms full duplex and half duplex in context of USRP…If i am using two antennas attached on the same channel on B210(one on TX/RX and other on RX2).I am Rxing through one antenna and retransmi… --- ## [Merge multiple complex streams](https://www.ruby-forum.com/t/merge-multiple-complex-streams/241086)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [May 14, 2014, 8:32am UTC](https://www.ruby-forum.com/t/merge-multiple-complex-streams/241086 "2014-05-14T08:32:31Z")
Playing around with GRC for a few months now, sorry if this question is from a dummy. I’ve a bunch of rtl dongles laying around, and wonder if it’s possible to combine more then one to a single baseband signal. The … --- ## [Problem in simulation on GRC at the measure of BER in digital modulations with Chunks to Symbol in r](https://www.ruby-forum.com/t/problem-in-simulation-on-grc-at-the-measure-of-ber-in-digital-modulations-with-chunks-to-symbol-in-r/241126)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 14, 2014, 5:26am UTC](https://www.ruby-forum.com/t/problem-in-simulation-on-grc-at-the-measure-of-ber-in-digital-modulations-with-chunks-to-symbol-in-r/241126 "2014-05-14T05:26:17Z")
Good Evening, I am a student of eletronic engineer in Brazil and I am using GNURadio Companion as a research. I have attached some pictures of my model on GRC and the problems. In this case, I made a circuit with PSK… --- ## [\[GSoC\] Accepted project: Radar Toolbox](https://www.ruby-forum.com/t/gsoc-accepted-project-radar-toolbox/241124)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 14, 2014, 12:41am UTC](https://www.ruby-forum.com/t/gsoc-accepted-project-radar-toolbox/241124 "2014-05-14T00:41:06Z")
Hi! First of all thanks to all of you for the acceptance, I am very glad to work on this great project! Finally I gathered all information! I’ll publish my gr-radar toolbox within the kit-cel account \[0\]. This link w… --- ## [CGRAN down, working on it](https://www.ruby-forum.com/t/cgran-down-working-on-it/240865)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [May 14, 2014, 12:14am UTC](https://www.ruby-forum.com/t/cgran-down-working-on-it/240865 "2014-05-14T00:14:06Z")
It looks like CGRAN is down for some reason. The machine that hosts it is still up and I haven’t found the cause of the problem yet. Still digging. George [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=71) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=73)