# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=76 [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:** 77 --- ## ["Sensitivity" parameter in Freq Modulation block in GRC](https://www.ruby-forum.com/t/sensitivity-parameter-in-freq-modulation-block-in-grc/240732)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 28, 2014, 8:49am UTC](https://www.ruby-forum.com/t/sensitivity-parameter-in-freq-modulation-block-in-grc/240732 "2014-04-28T08:49:13Z")
Hi I am trying to generate an LFM signal using GNU radio and USRP but I am not sure about the interpretation of “Sensitivity” parameter in “Freq Modulation” block that what are its units, what is the possible range a… --- ## [GR330 configure doesn't find usb.h](https://www.ruby-forum.com/t/gr330-configure-doesnt-find-usb-h/240726)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [April 28, 2014, 4:44am UTC](https://www.ruby-forum.com/t/gr330-configure-doesnt-find-usb-h/240726 "2014-04-28T04:44:25Z")
Hello all, I’m hoping someone can provide some insight to a build problem I’m seeing. I’m building 3.3.0 to use with an Ettus R. USRP1. I’m given to understand that I need to build 3.3.0 as that was the last release… --- ## [Ettus B200 and USB3.0 works. Or "It's better than USB2.0"](https://www.ruby-forum.com/t/ettus-b200-and-usb3-0-works-or-its-better-than-usb2-0/240716)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 27, 2014, 6:48am UTC](https://www.ruby-forum.com/t/ettus-b200-and-usb3-0-works-or-its-better-than-usb2-0/240716 "2014-04-27T06:48:17Z")
Just wanted to let all the people who are having USB 3.0 problems know that I am running a Hootoo HT-PC001 SuperSpeed USB 3.0 4 port PCI-E card which has the RECOMMENDED VIA VL805 (VL80X to quote the Ettus web page) … --- ## [Fetting Stereo Difference from 2 audio inputs?](https://www.ruby-forum.com/t/fetting-stereo-difference-from-2-audio-inputs/240715)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 27, 2014, 1:12am UTC](https://www.ruby-forum.com/t/fetting-stereo-difference-from-2-audio-inputs/240715 "2014-04-27T01:12:40Z")
Here’s an odd problem I’m having; I am attempting to get the stereo difference of two audio inputs from JACK, (Each connected to the L or R channel) \[AUDIO IN “L”\] - \> Subtract |\_ \[AUDIO IN “R”\] - \> Subtract | Wha… --- ## [Message passing between gnuradio block and python class](https://www.ruby-forum.com/t/message-passing-between-gnuradio-block-and-python-class/240710)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 26, 2014, 8:18pm UTC](https://www.ruby-forum.com/t/message-passing-between-gnuradio-block-and-python-class/240710 "2014-04-26T20:18:46Z")
Hi. I am trying to make message source block in python. This block will send value of some variable by message to python class. I want to send message from this block to python class. Is it possible to send message … --- ## [GUI development in GNU radio companion](https://www.ruby-forum.com/t/gui-development-in-gnu-radio-companion/240699)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 26, 2014, 6:20pm UTC](https://www.ruby-forum.com/t/gui-development-in-gnu-radio-companion/240699 "2014-04-26T18:20:48Z")
Hi all, Is it possible to make a GUI in GRC as we can do in MATLAB?? --- ## [OFDM RX Script Recovery After Interference](https://www.ruby-forum.com/t/ofdm-rx-script-recovery-after-interference/240575)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 26, 2014, 6:11pm UTC](https://www.ruby-forum.com/t/ofdm-rx-script-recovery-after-interference/240575 "2014-04-26T18:11:57Z")
Hey list, another OFDM question. I have this simple OFDM script I have used before and in between USRPs I have VHF handheld radio I am using as an interferer (also have plenty of attenuation, between USRPs it is about… --- ## [Re: How to reduce reconfiguration latency](https://www.ruby-forum.com/t/re-how-to-reduce-reconfiguration-latency/240623)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [April 26, 2014, 1:07am UTC](https://www.ruby-forum.com/t/re-how-to-reduce-reconfiguration-latency/240623 "2014-04-26T01:07:28Z")
Hi Marcus, Thanks for reply. Let me try to answer the questions. Yes. The signal frequency shifted by +/- 5%. The transfer burst is constant. The frequency shift remains constant during a burst. So I estimate the sh… --- ## [Works better than USB 3.0 SDR devices running some apps ---\> Re: GnuRadio/USRP1 application compatib](https://www.ruby-forum.com/t/works-better-than-usb-3-0-sdr-devices-running-some-apps-re-gnuradio-usrp1-application-compatib/240694)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 25, 2014, 9:59pm UTC](https://www.ruby-forum.com/t/works-better-than-usb-3-0-sdr-devices-running-some-apps-re-gnuradio-usrp1-application-compatib/240694 "2014-04-25T21:59:54Z")
Marcus, Let’s find out and compare USB 2.0 SDR devices running certain applications versus your USB 3.0 SDR devices ? No more talking please. The ASRP1, now to be called, SDR MIMO, will be available next month as w… --- ## [GRC - python code generation quirk for Function Probe with empty BlockID](https://www.ruby-forum.com/t/grc-python-code-generation-quirk-for-function-probe-with-empty-blockid/240691)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 25, 2014, 6:46pm UTC](https://www.ruby-forum.com/t/grc-python-code-generation-quirk-for-function-probe-with-empty-blockid/240691 "2014-04-25T18:46:25Z")
Hi, I’ve been pottering around in GRC trying to get a pair of function probe’s to update the QT fosphor GUI sink’s centre frequency by calling self.set\_freq(float(subprocess.check\_output(\[’/usr/bin/rigctl’, ‘-m’, ‘2’… --- ## [Controlling Digital I/O from GRC](https://www.ruby-forum.com/t/controlling-digital-i-o-from-grc/240677)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 25, 2014, 6:19pm UTC](https://www.ruby-forum.com/t/controlling-digital-i-o-from-grc/240677 "2014-04-25T18:19:52Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Finding max index in a vector](https://www.ruby-forum.com/t/finding-max-index-in-a-vector/240674)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 25, 2014, 6:16pm UTC](https://www.ruby-forum.com/t/finding-max-index-in-a-vector/240674 "2014-04-25T18:16:55Z")
How do I find the index of the max value in a vector from GRC? The max\_xx block outputs the max value, but not its index, despite what it’s documentation says: “Data is passed in as a vector of length from multiple i… --- ## [GnuRadio/USRP1 application compatible HandHeld Wideband 33 Megahertz – 4.4 Gigahertz Software Define](https://www.ruby-forum.com/t/gnuradio-usrp1-application-compatible-handheld-wideband-33-megahertz-4-4-gigahertz-software-define/240673)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 25, 2014, 5:36pm UTC](https://www.ruby-forum.com/t/gnuradio-usrp1-application-compatible-handheld-wideband-33-megahertz-4-4-gigahertz-software-define/240673 "2014-04-25T17:36:11Z")
Since this device utilizes the LibUSRP driver, all USRP1 Applications should be able to work with this SDR device. This handheld wideband SDR device fits comfortably within the dimensions of the BladeRF, but utilizes… --- ## [For loop int i in block](https://www.ruby-forum.com/t/for-loop-int-i-in-block/240688)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 25, 2014, 5:23pm UTC](https://www.ruby-forum.com/t/for-loop-int-i-in-block/240688 "2014-04-25T17:23:11Z")
Dear sir What is the maximum i value in for loop in a c++ block Neil --- ## [Test](https://www.ruby-forum.com/t/test/240675)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 25, 2014, 3:52pm UTC](https://www.ruby-forum.com/t/test/240675 "2014-04-25T15:52:03Z")
Testing mail server. Seems server wide problem. Tom --- ## [Installing gnuradio e110](https://www.ruby-forum.com/t/installing-gnuradio-e110/240631)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [April 25, 2014, 3:05pm UTC](https://www.ruby-forum.com/t/installing-gnuradio-e110/240631 "2014-04-25T15:05:25Z")
Hello, i’m new in gnuradio and i want to update all needed to program this device the e110. how it says in: http://code.ettus.com/redmine/ettus/projects/usrpe1xx/wiki/FAQ#How-do-I-install-GNU-Radio-from-source i hav… --- ## [Issue about message port of grextras](https://www.ruby-forum.com/t/issue-about-message-port-of-grextras/240593)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 4\ **Last updated:** [April 25, 2014, 8:17am UTC](https://www.ruby-forum.com/t/issue-about-message-port-of-grextras/240593 "2014-04-25T08:17:33Z")
Hi all, Recently I am learning the grextras project. I am confused about the message port which is designed in grextras. Why will we not get a error when the message ports do not connect to other message ports? I tho… --- ## [Ofdm\_txrx.py](https://www.ruby-forum.com/t/ofdm-txrx-py/240644)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 25, 2014, 6:39am UTC](https://www.ruby-forum.com/t/ofdm-txrx-py/240644 "2014-04-25T06:39:38Z")
I run the file “ofdm\_txrx.py” from terminal using command ./ofdm\_txrx.py But I got errors !!! why ? Thanks in advance ! Here is the output on terminal: ./ofdm\_txrx\_me.py: line 26: OFDM Transmitter / Receiver hier b… --- ## [Control audio recording using function probe](https://www.ruby-forum.com/t/control-audio-recording-using-function-probe/240676)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 25, 2014, 6:31am UTC](https://www.ruby-forum.com/t/control-audio-recording-using-function-probe/240676 "2014-04-25T06:31:23Z")
Hi, have an issue with controlling audio recording with function probe, that measures signal level. A variable ‘muted’ is set to 0 or 1 depending on current rf power threshold, and depending on muted state recording … --- ## [Coding bug in gr-channels/lib/flat\_fader\_impl.cc](https://www.ruby-forum.com/t/coding-bug-in-gr-channels-lib-flat-fader-impl-cc/240645)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 25, 2014, 6:20am UTC](https://www.ruby-forum.com/t/coding-bug-in-gr-channels-lib-flat-fader-impl-cc/240645 "2014-04-25T06:20:10Z")
I believe there is a bug in file gr-channels/lib/flat\_fader\_impl.cc, line 67 according to Eq.4 of paper “Improved Models for the Generation of Multiple Uncorrelated Rayleigh Fading Waveforms” published on IEEE COMMUN… --- ## [Reference Clock power level for Ettus N210](https://www.ruby-forum.com/t/reference-clock-power-level-for-ettus-n210/240617)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [April 25, 2014, 4:04am UTC](https://www.ruby-forum.com/t/reference-clock-power-level-for-ettus-n210/240617 "2014-04-25T04:04:23Z")
Hi, I’m using a USRP N210 and I need a 10 MHz reference clock. From ettus.com I got: " Ref Clock - 10 MHz Using an external 10 MHz reference clock, a square wave will offer the best phase noise performance, but a s… --- ## [Unable to link to fir\_filter\_ccc update tap method](https://www.ruby-forum.com/t/unable-to-link-to-fir-filter-ccc-update-tap-method/240661)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 24, 2014, 5:12pm UTC](https://www.ruby-forum.com/t/unable-to-link-to-fir-filter-ccc-update-tap-method/240661 "2014-04-24T17:12:19Z")
Hello, I wrote some code that uses fir filter\_ccc::update\_tap method. The code compiles in Gnuradio but when I try to run it in python, I get this error: ImportError: /usr/local/lib/libgnuradio-adaptive\_filter.so: un… --- ## [Receive WiFi Signal with USRP N210](https://www.ruby-forum.com/t/receive-wifi-signal-with-usrp-n210/240648)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 24, 2014, 10:14am UTC](https://www.ruby-forum.com/t/receive-wifi-signal-with-usrp-n210/240648 "2014-04-24T10:14:29Z")
I try to receive the WiFi signal with 802.11n standard,and the grc as attachment. It showed many “D”(overflow) in the terminal even at low sample rate (2M). I tried other two notebooks and use simple grc( uhd\_usrp\_sou… --- ## [WX GUI FFT sink block issues](https://www.ruby-forum.com/t/wx-gui-fft-sink-block-issues/240611)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 10\ **Last updated:** [April 24, 2014, 9:34am UTC](https://www.ruby-forum.com/t/wx-gui-fft-sink-block-issues/240611 "2014-04-24T09:34:15Z")
I am facing issues regarding WX GUI fft sink block… First that whatever center frequency i am providing it is showing a peak at that frequency whether input signal is there or not…?? Secondly there is a question that… --- ## [Packet/frame error rate](https://www.ruby-forum.com/t/packet-frame-error-rate/240653)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 24, 2014, 8:08am UTC](https://www.ruby-forum.com/t/packet-frame-error-rate/240653 "2014-04-24T08:08:39Z")
I executed some my own flow graphs to measure BER/SER values, for that I used Error Rate block. If I want to measure Packet or frame error rates, Which blocks I can use in GNU Radio? Could you please let me know, how … --- ## [Announcing NEWSDR in Boston on Friday June 6](https://www.ruby-forum.com/t/announcing-newsdr-in-boston-on-friday-june-6/240643)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 24, 2014, 5:35am UTC](https://www.ruby-forum.com/t/announcing-newsdr-in-boston-on-friday-june-6/240643 "2014-04-24T05:35:20Z")
Fourth-Annual \* \* New England Workshop on Software-Defined Radio \* NEWSDR 2014 \* … --- ## [Denver Area Meetup?](https://www.ruby-forum.com/t/denver-area-meetup/240379)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 24, 2014, 4:51am UTC](https://www.ruby-forum.com/t/denver-area-meetup/240379 "2014-04-24T04:51:39Z")
Is anyone doing a GnuRadio / SDR meetup in the Denver Area? If not, is anyone in the area interested? First beer is on me. :slight\_smile: –Eric --- ## [Phase errors and expected behavior of in-flight samples when a flowgraph is reconfigured](https://www.ruby-forum.com/t/phase-errors-and-expected-behavior-of-in-flight-samples-when-a-flowgraph-is-reconfigured/240559)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 10\ **Last updated:** [April 24, 2014, 4:47am UTC](https://www.ruby-forum.com/t/phase-errors-and-expected-behavior-of-in-flight-samples-when-a-flowgraph-is-reconfigured/240559 "2014-04-24T04:47:31Z")
I’ve seen three different intermittent misbehaviors in my application which can be described as parallel signal paths getting out of phase with each other. (For example, one of them is one stereo audio output channel … --- ## [Dealing with framed data](https://www.ruby-forum.com/t/dealing-with-framed-data/240625)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 24, 2014, 1:13am UTC](https://www.ruby-forum.com/t/dealing-with-framed-data/240625 "2014-04-24T01:13:49Z")
Hi, I’m currently trying to take the output of a fft block and pipe it in a tcp sink for (near) real-time processing outside of gnuradio. My question is: Assuming that I have vectors of n floats (the fft block output… --- ## [ICE for emebedded builds](https://www.ruby-forum.com/t/ice-for-emebedded-builds/240635)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 23, 2014, 10:08pm UTC](https://www.ruby-forum.com/t/ice-for-emebedded-builds/240635 "2014-04-23T22:08:02Z")
Tom and I have put some effort into integrating Ice into OE so we can support control port builds. It will take a bit before I can get the updates needed into meta-oe, so I have pushed a couple of branches for people … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=75) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=77)