# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=11 [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:** 12 --- ## [Usrp\_sink tags confusion](https://www.ruby-forum.com/t/usrp-sink-tags-confusion/242974)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [August 12, 2015, 8:49am UTC](https://www.ruby-forum.com/t/usrp-sink-tags-confusion/242974 "2015-08-12T08:49:58Z")
Dear all, I would like to do some simple frequency hopping over my USRP (x300 with UBX-160 daugherboard). To that end I wish to use the following tags: tx\_len (defined in the length-tag field of the USRP sink). This … --- ## [Re: mirrored spectrum around tuning freq](https://www.ruby-forum.com/t/re-mirrored-spectrum-around-tuning-freq/242969)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 2\ **Last updated:** [August 11, 2015, 11:26pm UTC](https://www.ruby-forum.com/t/re-mirrored-spectrum-around-tuning-freq/242969 "2015-08-11T23:26:43Z")
Hi Martin, Marcus, I am using a N200 + WBX. Gain set on the USRP is equal to 5 dB. Changing the power of the input signal does not change anything. Moreover the output of the signal generator is sent (via a 2way pow… --- ## [Using external usb soundcard](https://www.ruby-forum.com/t/using-external-usb-soundcard/242971)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 5\ **Last updated:** [August 11, 2015, 9:38pm UTC](https://www.ruby-forum.com/t/using-external-usb-soundcard/242971 "2015-08-11T21:38:04Z")
Hi, i want to use an external usb sound device. It works without any problems when playing back music. I dont know how the audio sink block or gnuradio works with this extern sound device. Howto tell gnuradio to read… --- ## [Re: ControlPort 3.7.8rc1](https://www.ruby-forum.com/t/re-controlport-3-7-8rc1/242960)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 2\ **Last updated:** [August 11, 2015, 12:49pm UTC](https://www.ruby-forum.com/t/re-controlport-3-7-8rc1/242960 "2015-08-11T12:49:19Z")
On Sat, Aug 8, 2015 at 11:20 AM, bob wole removed\_email\_address@domain.invalid wrote: where you in controlport related stuff. Re: \[Discuss-gnuradio\] Measuring performance of module 2015-08-04 16:36 GMT+09:00 b… --- ## [OFDM and FEC combined](https://www.ruby-forum.com/t/ofdm-and-fec-combined/242958)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [August 11, 2015, 3:51am UTC](https://www.ruby-forum.com/t/ofdm-and-fec-combined/242958 "2015-08-11T03:51:05Z")
I am working with the OFDM and FEC blocks combined in the same flowgraph, but this configuration led to some issues and I am not being able to sort this out. I am using the OFDM Transmitter and Receiver Hier Blocks … --- ## [Mirrored spectrum around tuning freq](https://www.ruby-forum.com/t/mirrored-spectrum-around-tuning-freq/242953)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [August 10, 2015, 6:40pm UTC](https://www.ruby-forum.com/t/mirrored-spectrum-around-tuning-freq/242953 "2015-08-10T18:40:13Z")
Hi all, why when I use: uhd::tune\_request\_t tr(tuningFreq); USRP\_DEVICE-\>set\_rx\_freq(tr); I get a spectrum that is “mirrored” around the tuninFreq ? See: http://picpaste.com/sp-zJquS0qK.png with tuningFreq = 149.8 … --- ## [Processing expectations](https://www.ruby-forum.com/t/processing-expectations/242927)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 12\ **Last updated:** [August 10, 2015, 3:37pm UTC](https://www.ruby-forum.com/t/processing-expectations/242927 "2015-08-10T15:37:57Z")
I’m brand new to SDR and I’m just trying to calibrate my expectations of what will be possible in real time. I’m hoping someone here can give me a pointer or two. I’m running GNU Radio 3.7.2 on Ubuntu 14.04, having … --- ## [USRP tuning time](https://www.ruby-forum.com/t/usrp-tuning-time/242946)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 6\ **Last updated:** [August 10, 2015, 3:00pm UTC](https://www.ruby-forum.com/t/usrp-tuning-time/242946 "2015-08-10T15:00:33Z")
Dear all, After quite some searching, I wasn’t able to find information about how long it takes to retune a USRP (say, change the centre frequency). Do you guys know anything about that? Specifically, I’m using a USRP… --- ## [Pybombs install problem](https://www.ruby-forum.com/t/pybombs-install-problem/242950)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [August 10, 2015, 2:55am UTC](https://www.ruby-forum.com/t/pybombs-install-problem/242950 "2015-08-10T02:55:07Z")
Greetings, I am trying to install the latest gnuradio using pybombs. I am running linux mint on an amd64 machine. Here is the terminal output, basically it just keeps repeating the same thing, and then finally kicks … --- ## [Burst TX and RX](https://www.ruby-forum.com/t/burst-tx-and-rx/242945)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [August 9, 2015, 11:54pm UTC](https://www.ruby-forum.com/t/burst-tx-and-rx/242945 "2015-08-09T23:54:54Z")
I am just starting to work with a USRP in order to create burst TX and simultaneous RX streams, so I am trying to learn about tagged streams, which I believe is the way to do this. I see references in this forum to a … --- ## [Packet Flowgraph and underflows](https://www.ruby-forum.com/t/packet-flowgraph-and-underflows/242901)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 4\ **Last updated:** [August 9, 2015, 3:25pm UTC](https://www.ruby-forum.com/t/packet-flowgraph-and-underflows/242901 "2015-08-09T15:25:48Z")
Hi, I’ve been looking for a solution to this and can’t seem to find any examples. If I have a flowgraph that transmits packets for instance from a TCP stream - if this TCP stream only receives data occasionally it wi… --- ## [Block keeps buffering data](https://www.ruby-forum.com/t/block-keeps-buffering-data/242935)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [August 9, 2015, 7:15am UTC](https://www.ruby-forum.com/t/block-keeps-buffering-data/242935 "2015-08-09T07:15:37Z")
Hi, I’ve written a Python block to feed some binary data into my QPSK transmission. This block is supposed to grab the data according to the 1200 baud rate I have set up for the transmission. Well, so I thought. GNU … --- ## [Audio woes](https://www.ruby-forum.com/t/audio-woes/242940)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 4\ **Last updated:** [August 9, 2015, 4:16am UTC](https://www.ruby-forum.com/t/audio-woes/242940 "2015-08-09T04:16:15Z")
I have a Xeon server system with a SB X-Fi USB sound module on it. Changed configuration so that system sounds play on it, etc. Youtube works just fine. But any GR app that tries to use it gets massive underruns, rega… --- ## [OOT block not showing in GRC](https://www.ruby-forum.com/t/oot-block-not-showing-in-grc/242943)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 6\ **Last updated:** [August 9, 2015, 1:07am UTC](https://www.ruby-forum.com/t/oot-block-not-showing-in-grc/242943 "2015-08-09T01:07:34Z")
Hello all, I am trying to create a simple OOT block. Eventually I would like to create a block that lets a transmitting agent know if their message was received or not, but for now I am just trying to create a block… --- ## [Pybombs install failure](https://www.ruby-forum.com/t/pybombs-install-failure/242938)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [August 9, 2015, 12:25am UTC](https://www.ruby-forum.com/t/pybombs-install-failure/242938 "2015-08-09T00:25:30Z")
I am trying to install latest gnuradio with pybombs on linux mint 64 bit, and I get the error “Too many arguments” repeated multiple times: --- ## [Using bus connections](https://www.ruby-forum.com/t/using-bus-connections/242937)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [August 8, 2015, 10:53pm UTC](https://www.ruby-forum.com/t/using-bus-connections/242937 "2015-08-08T22:53:47Z")
Can anyone tell me what GRC is trying to tell me with this flow-graph – it has bus connections, and it gripes. Not sure why: http://www.sbrac.org/files/multi\_chan\_pulsar.grc --- ## [Channelizer demonstration](https://www.ruby-forum.com/t/channelizer-demonstration/242939)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [August 8, 2015, 10:15pm UTC](https://www.ruby-forum.com/t/channelizer-demonstration/242939 "2015-08-08T22:15:13Z")
I’ve put a short video of my tweaked version of Chris’ NOAA radio channelizer demo on Youtube at: - YouTube The screen capture didn’t get the drop-down box when I changed channels, but if you look at the upper-left co… --- ## ["D" errors after flowgraph runs for some time](https://www.ruby-forum.com/t/d-errors-after-flowgraph-runs-for-some-time/242936)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [August 8, 2015, 9:19pm UTC](https://www.ruby-forum.com/t/d-errors-after-flowgraph-runs-for-some-time/242936 "2015-08-08T21:19:09Z")
I am playing with a slightly modified version of Chris K.'s channelizer example for NOAA radio stations (my version attached). I’m using 3.7.6.1. The program runs just fine for the first 20-30 minutes on my I7-4710HQ … --- ## [FSK - implementation](https://www.ruby-forum.com/t/fsk-implementation/242931)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [August 8, 2015, 2:15pm UTC](https://www.ruby-forum.com/t/fsk-implementation/242931 "2015-08-08T14:15:01Z")
I have a question about BFSK/M-FSK modulations in GnuRadio. If I have a symbol 1 or 0 and it has got 64 samples (2 periods of sin/cos) and I want to modulate it with 2 different frequencies for example: f1 = 175 KHz =… --- ## [Re: file source with gr-ieee802.11 tx](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242907)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [August 8, 2015, 10:22am UTC](https://www.ruby-forum.com/t/re-file-source-with-gr-ieee802-11-tx/242907 "2015-08-08T10:22:31Z")
There is currently no option to dump raw bytes, but its a trivial modification of the Wireshark block (dump without a PCAP header). If you want to printed bytes as hex-values on the console that should work with the … --- ## [Re: ControlPort 3.7.8rc1](https://www.ruby-forum.com/t/re-controlport-3-7-8rc1/242915)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [August 8, 2015, 8:21am UTC](https://www.ruby-forum.com/t/re-controlport-3-7-8rc1/242915 "2015-08-08T08:21:36Z")
On Thu, Aug 6, 2015 at 6:36 PM, Tom R. removed\_email\_address@domain.invalid wrote: gnuradio-runtime/python/gnuradio/ctrlport Inspecting GNU Radio Applications with ControlPort and Performance Regards, git clon… --- ## [SOCIS project update 10](https://www.ruby-forum.com/t/socis-project-update-10/242924)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [August 7, 2015, 8:35pm UTC](https://www.ruby-forum.com/t/socis-project-update-10/242924 "2015-08-07T20:35:21Z")
Hey community! time for another project update. I case anyone still wonders, SOCIS is short for ESA Summer of Code in Space. I just wanted to mention it again. This week was about VOLKifying things again. Although th… --- ## [Usrp\_sink tx\_time tag](https://www.ruby-forum.com/t/usrp-sink-tx-time-tag/242922)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 2\ **Last updated:** [August 7, 2015, 6:51pm UTC](https://www.ruby-forum.com/t/usrp-sink-tx-time-tag/242922 "2015-08-07T18:51:49Z")
hi all I’ve one more tag related question: I want to sent packets in burst over a usrp\_sink. the time between two consecutive bursts should be 7ms. thus, I want to use a tx\_time\_tag along with every first item of a p… --- ## [UHD build apparently failed - build-gnuradio script](https://www.ruby-forum.com/t/uhd-build-apparently-failed-build-gnuradio-script/242895)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 3\ **Last updated:** [August 7, 2015, 5:36pm UTC](https://www.ruby-forum.com/t/uhd-build-apparently-failed-build-gnuradio-script/242895 "2015-08-07T17:36:00Z")
Hi, i try to install gnuradio with script (http://www.sbrac.org/files/build-gnuradio) on Debian 8.4 64bit. I change in script version and he download pretty much of files, when he come to UHD, he breaks: Skipping gi… --- ## [Filterbank](https://www.ruby-forum.com/t/filterbank/242916)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [August 7, 2015, 4:31pm UTC](https://www.ruby-forum.com/t/filterbank/242916 "2015-08-07T16:31:44Z")
How to switch receiving Filterbank from Gnuradio in USRP B200. I plan to add this Filterbank and switch it using onboard pin connector. Jakub --- ## [Re: gr-perf-monitorx Error](https://www.ruby-forum.com/t/re-gr-perf-monitorx-error/242914)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [August 7, 2015, 6:49am UTC](https://www.ruby-forum.com/t/re-gr-perf-monitorx-error/242914 "2015-08-07T06:49:17Z")
On Thu, Aug 6, 2015 at 6:36 PM, Tom R. removed\_email\_address@domain.invalid wrote: --- ## [Extremely low buffer usage on perf monitor](https://www.ruby-forum.com/t/extremely-low-buffer-usage-on-perf-monitor/242904)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 4\ **Last updated:** [August 7, 2015, 12:43am UTC](https://www.ruby-forum.com/t/extremely-low-buffer-usage-on-perf-monitor/242904 "2015-08-07T00:43:36Z")
I am looking into CPU and buffer usage of my OOT module via CtrlPort Performance Monitor. I have two flow graphs, a transmitter and a receiver. I can see a quite reasonable performance measures on the receiver side: H… --- ## [Re: ControlPort 3.7.8rc1](https://www.ruby-forum.com/t/re-controlport-3-7-8rc1/242899)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 1\ **Last updated:** [August 6, 2015, 11:25pm UTC](https://www.ruby-forum.com/t/re-controlport-3-7-8rc1/242899 "2015-08-06T23:25:54Z")
On Wed, Aug 5, 2015 at 6:46 PM, Tom R. removed\_email\_address@domain.invalid wrote: Re: \[Discuss-gnuradio\] Measuring performance of module I just installed frest gnuradio 3.7.8rc1 with control port enabled. I How… --- ## [USRP/SDR with Gnuradio](https://www.ruby-forum.com/t/usrp-sdr-with-gnuradio/242911)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 4\ **Last updated:** [August 6, 2015, 10:46pm UTC](https://www.ruby-forum.com/t/usrp-sdr-with-gnuradio/242911 "2015-08-06T22:46:45Z")
Hello, everybody! I’m developing a project related to Cognitive Radio (an energy detector, more specifically) and I have to buy a USRP or SDR board to continue developing it. For now, I just need a simple and basic b… --- ## [Impulse Response of wide band wireless channel](https://www.ruby-forum.com/t/impulse-response-of-wide-band-wireless-channel/242905)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [August 6, 2015, 9:13pm UTC](https://www.ruby-forum.com/t/impulse-response-of-wide-band-wireless-channel/242905 "2015-08-06T21:13:17Z")
Hii Is the Impulse Response of wide band wireless channel has only few significant components as compared to the channel delay spread ? This question is not related to gnu radio. I asked it, just to know the opinio… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=10) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=12)