# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=61 [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:** 62 --- ## [Number of taps in pfb filter?](https://www.ruby-forum.com/t/number-of-taps-in-pfb-filter/231045)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 18, 2014, 4:52pm UTC](https://www.ruby-forum.com/t/number-of-taps-in-pfb-filter/231045 "2014-07-18T16:52:18Z")
hello list, when I am trying to channelize a baseband with following specs: sample rate: 2MHz bandwidth for low pass filter: 145kHz transition bandwidth: 10 kHz number of channels: 10 pfb decimation: 4 When I see … --- ## [Error in OP25 Decoder block](https://www.ruby-forum.com/t/error-in-op25-decoder-block/231053)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 18, 2014, 4:41pm UTC](https://www.ruby-forum.com/t/error-in-op25-decoder-block/231053 "2014-07-18T16:41:40Z")
I have built Ubuntu 14.04 and installed Pybombs, GNURadio 3.7.2, op25 and gr-baz. Tom R. helped me through an error with unresolved baz imports. Now, I brought in the blocks to decode op25 and the OP25 Decoder block… --- ## [Phase demodulation](https://www.ruby-forum.com/t/phase-demodulation/212531)
**Author:** [@dubstep](https://www.ruby-forum.com/u/dubstep)\ **Replies:** 2\ **Last updated:** [July 18, 2014, 5:05am UTC](https://www.ruby-forum.com/t/phase-demodulation/212531 "2014-07-18T05:05:45Z")
Excuse my ignorance but I need this spelled out for me. I am trying to come up with a phase demodulator to effectively perform the opposite function as the gr\_phase\_modulator\_fc class. According to the code this is … --- ## [Re: Good example of AGC after RTL\_SDR](https://www.ruby-forum.com/t/re-good-example-of-agc-after-rtl-sdr/231022)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 18, 2014, 12:42am UTC](https://www.ruby-forum.com/t/re-good-example-of-agc-after-rtl-sdr/231022 "2014-07-18T00:42:42Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Tunnel.py keep USRP transmitting UDP packets](https://www.ruby-forum.com/t/tunnel-py-keep-usrp-transmitting-udp-packets/231033)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 17, 2014, 11:12pm UTC](https://www.ruby-forum.com/t/tunnel-py-keep-usrp-transmitting-udp-packets/231033 "2014-07-17T23:12:16Z")
Deal all, When I run tunnel.py under the following path: gnuradio/gr-digital/examples/ofdm, the USRP N210 keep sending UDP packets to the computer through network interface card. It costs too much bandwidth (2MB/s)… --- ## [Enhanced GMSK demod question](https://www.ruby-forum.com/t/enhanced-gmsk-demod-question/231027)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 17, 2014, 8:00pm UTC](https://www.ruby-forum.com/t/enhanced-gmsk-demod-question/231027 "2014-07-17T20:00:46Z")
Hello everyone! I saw online they released an updated version of GMSK demod called “Enhanced GMSK”. I just want to double check if the GMSK demod in 3.4.3. version is the enhanced one? Also I wonder if there is any p… --- ## [Delay of Synchronization by using PPS](https://www.ruby-forum.com/t/delay-of-synchronization-by-using-pps/231025)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 17, 2014, 7:46pm UTC](https://www.ruby-forum.com/t/delay-of-synchronization-by-using-pps/231025 "2014-07-17T19:46:30Z")
hi guys, Im using a USRP-N and a USRP2 to send a Square Signal to another USRP2 for proving Synchronization by using PPS. after execute a get following message: linux; GNU C++ version 4.6.3; Boost\_104800; UHD\_003.007… --- ## [Why am I dropping data over the UDP network?](https://www.ruby-forum.com/t/why-am-i-dropping-data-over-the-udp-network/230908)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 23\ **Last updated:** [July 17, 2014, 6:16pm UTC](https://www.ruby-forum.com/t/why-am-i-dropping-data-over-the-udp-network/230908 "2014-07-17T18:16:39Z")
Hey Everyone, I am sending a signal from one USRP to another USRP through a UDP network. It seems to work but I am getting data loss as gnu-radio runs the flow graph. Hopefully someone could help me with this problem? … --- ## [Changing trace or background colour in the QT GUI scope](https://www.ruby-forum.com/t/changing-trace-or-background-colour-in-the-qt-gui-scope/231023)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 17, 2014, 5:43pm UTC](https://www.ruby-forum.com/t/changing-trace-or-background-colour-in-the-qt-gui-scope/231023 "2014-07-17T17:43:26Z")
Hello, Is there a way to change the colour of the trace or background in the QT GUI scope? Thanks, John --- ## [Re: Controls for the WXGUI waterfall widget](https://www.ruby-forum.com/t/re-controls-for-the-wxgui-waterfall-widget/231024)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 17, 2014, 5:35pm UTC](https://www.ruby-forum.com/t/re-controls-for-the-wxgui-waterfall-widget/231024 "2014-07-17T17:35:48Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [QT GUI time sink](https://www.ruby-forum.com/t/qt-gui-time-sink/231008)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [July 17, 2014, 5:24pm UTC](https://www.ruby-forum.com/t/qt-gui-time-sink/231008 "2014-07-17T17:24:46Z")
Hi all, When a complex signal is given to QT time sink block it displays the signal in blue color.There is a red line also at zero level.is this the DC component??And it doesn’t display the imaginary part as in WX Sc… --- ## [Good example of AGC after RTL\_SDR](https://www.ruby-forum.com/t/good-example-of-agc-after-rtl-sdr/231018)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 17, 2014, 4:48pm UTC](https://www.ruby-forum.com/t/good-example-of-agc-after-rtl-sdr/231018 "2014-07-17T16:48:08Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Possible alsa error?](https://www.ruby-forum.com/t/possible-alsa-error/231021)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 17, 2014, 4:43pm UTC](https://www.ruby-forum.com/t/possible-alsa-error/231021 "2014-07-17T16:43:10Z")
Hello, sorry that the first message was sent before I could finish explaining. my fault, please excuse. I am using an 8 channel USB sound card as an audio source and the first test I do is to ensure that the audio s… --- ## [GRCon14: Call for posters and demos](https://www.ruby-forum.com/t/grcon14-call-for-posters-and-demos/240961)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [July 17, 2014, 4:41pm UTC](https://www.ruby-forum.com/t/grcon14-call-for-posters-and-demos/240961 "2014-07-17T16:41:47Z")
Hello everybody, We plan to host a poster and demo session at GNU Radio Conference 2014. While this is a new experiment for us, other conferences have had these for a while now. Showcasing projects or research work in… --- ## [Controls for the WXGUI waterfall widget](https://www.ruby-forum.com/t/controls-for-the-wxgui-waterfall-widget/231017)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 17, 2014, 4:36pm UTC](https://www.ruby-forum.com/t/controls-for-the-wxgui-waterfall-widget/231017 "2014-07-17T16:36:55Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [FFT data in a file](https://www.ruby-forum.com/t/fft-data-in-a-file/231020)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 17, 2014, 4:36pm UTC](https://www.ruby-forum.com/t/fft-data-in-a-file/231020 "2014-07-17T16:36:12Z")
Hello community, I am trying to capture the fft data of the received signal in readable format. I am very much new to software-radio and USRP and facing some difficulties. Basically I want to plot the captured fft da… --- ## [Possible alsa error?](https://www.ruby-forum.com/t/possible-alsa-error/231019)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 17, 2014, 4:29pm UTC](https://www.ruby-forum.com/t/possible-alsa-error/231019 "2014-07-17T16:29:17Z")
Hello, I am using an 8 channel USB sound card as an audio source and the first test I do is to ensure that the audio signals can be seen in the attached QT scope block screen shot. This works perfectly when the PC i… --- ## [Posting messages from outside the work function in Python](https://www.ruby-forum.com/t/posting-messages-from-outside-the-work-function-in-python/231016)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 17, 2014, 3:22pm UTC](https://www.ruby-forum.com/t/posting-messages-from-outside-the-work-function-in-python/231016 "2014-07-17T15:22:51Z")
Hello, I would like to write a block in Python that is a message source (no IO ports, only message port). I’ve found a few examples in C++ of blocks that don’t do signal processing and don’t rely on the work() functi… --- ## [State of offline signal analysis tools in 2014?](https://www.ruby-forum.com/t/state-of-offline-signal-analysis-tools-in-2014/230993)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [July 17, 2014, 2:02pm UTC](https://www.ruby-forum.com/t/state-of-offline-signal-analysis-tools-in-2014/230993 "2014-07-17T14:02:32Z")
GNU Radio is a great tool for applications and dynamic experimentation, but it doesn’t have a lot of support for static/offline analysis of time-series data. I.e. I’ve captured some signal data and I want to explore … --- ## [Failed to install GNUradio 3.7.3 on Ubuntu 14.04](https://www.ruby-forum.com/t/failed-to-install-gnuradio-3-7-3-on-ubuntu-14-04/231011)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 17, 2014, 1:54pm UTC](https://www.ruby-forum.com/t/failed-to-install-gnuradio-3-7-3-on-ubuntu-14-04/231011 "2014-07-17T13:54:14Z")
Dear all, I am trying to install GNUradio 3.7.3 on Ubuntu 14.04. I did everything necessary to install GNUradio such as: dependencies, required libraries … Even when I run “make test”, it turns out to be passed 100% … --- ## [Error installing gr-baz](https://www.ruby-forum.com/t/error-installing-gr-baz/230994)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 17, 2014, 11:59am UTC](https://www.ruby-forum.com/t/error-installing-gr-baz/230994 "2014-07-17T11:59:53Z")
Yesterday, I built a new Ubuntu 14.04, installed the new GNURadio 3.7.4 and installed gr-op25. This all works, except that the gr-baz Op25 Decoder block, and other blocks, have unresolved baz imports. I ran ./pybombs… --- ## [Analog video modulation](https://www.ruby-forum.com/t/analog-video-modulation/231003)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 17, 2014, 7:15am UTC](https://www.ruby-forum.com/t/analog-video-modulation/231003 "2014-07-17T07:15:23Z")
After finishing my AM Stereo transmitter, I have decided to build an NTSC modulator. I think I have the actually modulation and filter blocks down, I just need to firgure out how to get the right signals from a digit… --- ## [\[GSoC\] gr-radar: Dual CW Radar and Tracking Algorithms](https://www.ruby-forum.com/t/gsoc-gr-radar-dual-cw-radar-and-tracking-algorithms/230970)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [July 16, 2014, 11:37am UTC](https://www.ruby-forum.com/t/gsoc-gr-radar-dual-cw-radar-and-tracking-algorithms/230970 "2014-07-16T11:37:57Z")
Hi, The Radar Toolbox has new features! First new feature of the Radar Toolbox is a Dual CW Radar. It is implemented as simulation and tested with USRPs. This setup is much more better than the previous FSK Radar! C… --- ## [GNURadio on Zynq: radiomodem and fast ADC sources, processing on the PL](https://www.ruby-forum.com/t/gnuradio-on-zynq-radiomodem-and-fast-adc-sources-processing-on-the-pl/230986)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 16, 2014, 9:55am UTC](https://www.ruby-forum.com/t/gnuradio-on-zynq-radiomodem-and-fast-adc-sources-processing-on-the-pl/230986 "2014-07-16T09:55:48Z")
I wish to inform the GNURadio community on some of the latest results on the use of the Xilinx Zynq platform for real time radiofrequency signal processing aimed at making the best use of the PS/PL architecture. Let … --- ## [GMSK Transmit](https://www.ruby-forum.com/t/gmsk-transmit/230983)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 16, 2014, 1:07am UTC](https://www.ruby-forum.com/t/gmsk-transmit/230983 "2014-07-16T01:07:12Z")
I am working a project where I need to receive bytes via a UDP source, encode as GMSK and transmit via Ettus UHD. My main question is how do I set the bit rate since I really cannot control the UDP source? My receivi… --- ## [Ofdm channel estimation](https://www.ruby-forum.com/t/ofdm-channel-estimation/230928)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [July 16, 2014, 12:27am UTC](https://www.ruby-forum.com/t/ofdm-channel-estimation/230928 "2014-07-16T00:27:16Z")
Hi all: Have you ever using the gnuradio/gr-digital/examples/ofdm/rx\_ofdm.grc?And I change the rx\_ofdm.py as follows: self.connect((self.digital\_ofdm\_chanest\_vcvc\_0, 1), blocks.file\_sink(gr.sizeof\_gr\_complex \* fft\_l… --- ## [Repack bits & header generator](https://www.ruby-forum.com/t/repack-bits-header-generator/230981)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 16, 2014, 12:23am UTC](https://www.ruby-forum.com/t/repack-bits-header-generator/230981 "2014-07-16T00:23:42Z")
HI all, I want to ask about the repack bits block http://gnuradio.org/doc/doxygen/classgr\_1\_1blocks\_1\_1repack\_\_bits\_\_bb.html Does it change the rate of the output relative to the input ? what does it mean it makes an… --- ## [PyBOMBS skip volk\_profile](https://www.ruby-forum.com/t/pybombs-skip-volk-profile/230978)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 15, 2014, 11:07pm UTC](https://www.ruby-forum.com/t/pybombs-skip-volk-profile/230978 "2014-07-15T23:07:58Z")
Is there a clean way to skip volk\_profile when rebuilding gnuradio with PyBOMBS? This setting seems to be automated and I can’t find where to switch it off. Thanks, Sean --- ## [Ofdm tramsmitter](https://www.ruby-forum.com/t/ofdm-tramsmitter/230935)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 15, 2014, 10:09pm UTC](https://www.ruby-forum.com/t/ofdm-tramsmitter/230935 "2014-07-15T22:09:31Z")
Hi, I hope if someone can help me, i have some questions related to the Ofdm transmitter block: I take the input of the transmitter from a sip phone, i can find from wireshark that the length of the packet of Sip p… --- ## [Grc block for measuring sample rate?](https://www.ruby-forum.com/t/grc-block-for-measuring-sample-rate/230977)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 15, 2014, 9:13pm UTC](https://www.ruby-forum.com/t/grc-block-for-measuring-sample-rate/230977 "2014-07-15T21:13:24Z")
A challenge that I am encountering recently when building flow graphs is with upsampling and downsampling and getting the sample rate where I need it. Sometimes I have rate mismatches and don’t know a good way to take… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=60) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=62)