# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=42 [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:** 43 --- ## [Varying the bandwidth of a signal in GRC](https://www.ruby-forum.com/t/varying-the-bandwidth-of-a-signal-in-grc/233341)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [December 6, 2014, 11:22am UTC](https://www.ruby-forum.com/t/varying-the-bandwidth-of-a-signal-in-grc/233341 "2014-12-06T11:22:28Z")
Hi , Can anyone kindly tell that how i can vary the bandwidth of my transmitted signal in GRC??I am using B210 which has a instantaneous bandwidth of 56MHz… --- ## [Questions with the blocks inside PSK Mod/Demod blocks](https://www.ruby-forum.com/t/questions-with-the-blocks-inside-psk-mod-demod-blocks/233300)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 5, 2014, 3:38pm UTC](https://www.ruby-forum.com/t/questions-with-the-blocks-inside-psk-mod-demod-blocks/233300 "2014-12-05T15:38:25Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Log raw data from the usrp\_spectrum\_sense.py](https://www.ruby-forum.com/t/log-raw-data-from-the-usrp-spectrum-sense-py/234862)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 11\ **Last updated:** [December 5, 2014, 1:43pm UTC](https://www.ruby-forum.com/t/log-raw-data-from-the-usrp-spectrum-sense-py/234862 "2014-12-05T13:43:05Z")
I’m using the usrp\_spectrum\_sense.py to get the raw data for the wide band spectrum for FFT in the FPGA . The thing confused me is what the raw data is. Is that the complex signal before fft ? As m.raw\_data is a st… --- ## [Can a tagged stream block be a source block?](https://www.ruby-forum.com/t/can-a-tagged-stream-block-be-a-source-block/233329)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [December 5, 2014, 11:16am UTC](https://www.ruby-forum.com/t/can-a-tagged-stream-block-be-a-source-block/233329 "2014-12-05T11:16:54Z")
Hi I am implementing a complete protocol in a module where most of the MAC layer will be placed in a tagged stream block. I intend to start out implementing the transmit chain and then the receive chain. The problem … --- ## [HDLC framer](https://www.ruby-forum.com/t/hdlc-framer/234852)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 5\ **Last updated:** [December 5, 2014, 11:15am UTC](https://www.ruby-forum.com/t/hdlc-framer/234852 "2014-12-05T11:15:40Z")
Hi, I read in the documentation that HDLC framer takes in PMT binary blobs and outputs HDLC frames as unpacked bits.I don’t undestand what are the PMT binary blobs.How can I put in an HDLC frame a “Hello World” messag… --- ## [Msvc 2010 build problems](https://www.ruby-forum.com/t/msvc-2010-build-problems/233338)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 5, 2014, 11:03am UTC](https://www.ruby-forum.com/t/msvc-2010-build-problems/233338 "2014-12-05T11:03:23Z")
Hello, I made an attempt to compile the actual git master branch with MSVC2010 under win 7. There some issues which I want list as follows. (Sorry for some german compiler messages, but I think there are self explan… --- ## [Error to read dat/binary file in octave as well in matlab from gnu radio](https://www.ruby-forum.com/t/error-to-read-dat-binary-file-in-octave-as-well-in-matlab-from-gnu-radio/233336)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 5, 2014, 10:57am UTC](https://www.ruby-forum.com/t/error-to-read-dat-binary-file-in-octave-as-well-in-matlab-from-gnu-radio/233336 "2014-12-05T10:57:14Z")
Hello All, I am facing an error when i am trying to convert dat/bin(octet streams, binary application) into either octave or mat format. The bin file is generated from uhd\_rx\_cfile 0r rx\_samples\_to\_file, which i used… --- ## [RFNoC -- Making FPGA design easy from GNU Radio](https://www.ruby-forum.com/t/rfnoc-making-fpga-design-easy-from-gnu-radio/233330)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [December 5, 2014, 10:54am UTC](https://www.ruby-forum.com/t/rfnoc-making-fpga-design-easy-from-gnu-radio/233330 "2014-12-05T10:54:10Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [New iages for zc702 and zedboard](https://www.ruby-forum.com/t/new-iages-for-zc702-and-zedboard/233333)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 5, 2014, 12:35am UTC](https://www.ruby-forum.com/t/new-iages-for-zc702-and-zedboard/233333 "2014-12-05T00:35:57Z")
Are here: These where built with the manifest here: The images have gnuradio and some extra stuff. They are sized for 8GB SD cards. There is also a toolchain so you can compile your own GNU Radio blocks. To make… --- ## [Fwd: Log raw data from the usrp\_spectrum\_sense.py](https://www.ruby-forum.com/t/fwd-log-raw-data-from-the-usrp-spectrum-sense-py/233331)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 4, 2014, 7:51pm UTC](https://www.ruby-forum.com/t/fwd-log-raw-data-from-the-usrp-spectrum-sense-py/233331 "2014-12-04T19:51:48Z")
Marcus This is an explicit answer and guide to the exact tutorials I needed to start capturing my particular dataset. That said, a question on refinement (and I can put this on the list if you think there’s suffici… --- ## [Gr logger and alias](https://www.ruby-forum.com/t/gr-logger-and-alias/233247)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 4, 2014, 7:05pm UTC](https://www.ruby-forum.com/t/gr-logger-and-alias/233247 "2014-12-04T19:05:42Z")
GR users, GNURadio 3.7.4 (w/ log4cpp) on Linux (Ubuntu 14). We have an application that runs several (identical) flowgraphs at once and aggregates logs to a central processor. We wanted to differentiate the logging … --- ## [Interfacing gnuradio with red pitaya?](https://www.ruby-forum.com/t/interfacing-gnuradio-with-red-pitaya/233313)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 3, 2014, 4:24pm UTC](https://www.ruby-forum.com/t/interfacing-gnuradio-with-red-pitaya/233313 "2014-12-03T16:24:32Z")
Has anybody managed to interface Gnuradio with Red Pitaya (http://redpitaya.com) hardware ? Any opinions about this project ? While looking for (more or less) affordable SDR hardware I find the dynamic range of a 14bi… --- ## [Old School Message Queue w/ Out Stream I/O](https://www.ruby-forum.com/t/old-school-message-queue-w-out-stream-i-o/233304)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 3, 2014, 4:20pm UTC](https://www.ruby-forum.com/t/old-school-message-queue-w-out-stream-i-o/233304 "2014-12-03T16:20:15Z")
I’m using old-school message queues to do some thing with async messages from UHD. I have written a custom C++ block, which I was hoping would have a single msgq based input. However, I’ve found that the work() func… --- ## [How to correct for the drift in an (FMCW) Rx signal?](https://www.ruby-forum.com/t/how-to-correct-for-the-drift-in-an-fmcw-rx-signal/233261)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 10\ **Last updated:** [December 3, 2014, 3:34pm UTC](https://www.ruby-forum.com/t/how-to-correct-for-the-drift-in-an-fmcw-rx-signal/233261 "2014-12-03T15:34:20Z")
Hi, Given a set of synced (i.e., using external GPS REF/PPS), time-commanded and calibrated \*(i.e., through compensating for the phase/mag offset between digital Tx chirp prior to transmission and ADC’ed Rx signals) … --- ## [Discontinuous problem with usrp b200](https://www.ruby-forum.com/t/discontinuous-problem-with-usrp-b200/233312)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 3, 2014, 11:39am UTC](https://www.ruby-forum.com/t/discontinuous-problem-with-usrp-b200/233312 "2014-12-03T11:39:20Z")
Hello guys, I am trying benchmark\_tx and benchmark\_rx examples (both narrowband and OFDM) on B200 with --discontinuous option. However, I am not succeeding in receiving any packet even though I played around with the … --- ## [Too many extra samples at the end of the transmitted packets](https://www.ruby-forum.com/t/too-many-extra-samples-at-the-end-of-the-transmitted-packets/233003)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 3, 2014, 11:36am UTC](https://www.ruby-forum.com/t/too-many-extra-samples-at-the-end-of-the-transmitted-packets/233003 "2014-12-03T11:36:15Z")
Hello, I am using narrowband benchmark\_tx.py example to transmit packets. Each single packet is separated from its neighbors by a second. The parameters I am using: benchmark\_tx\_modified.py -m gmsk -s 4000 -r 1000000… --- ## [Gr::block::add\_item\_tag not exposed to Python](https://www.ruby-forum.com/t/gr-add-item-tag-not-exposed-to-python/233298)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 2, 2014, 3:20pm UTC](https://www.ruby-forum.com/t/gr-add-item-tag-not-exposed-to-python/233298 "2014-12-02T15:20:54Z")
Hello, there is a reason why the gr::block::add\_item\_tag() method and other methods to operate on stream tags are not available from Python? Should I send a patch to add them to the SWIG class definition? Thanks. Che… --- ## [Re: doppler correction](https://www.ruby-forum.com/t/re-doppler-correction/233294)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 2, 2014, 9:01am UTC](https://www.ruby-forum.com/t/re-doppler-correction/233294 "2014-12-02T09:01:56Z")
Maria, You can’t readily do it that way. The demodulator works at baseband, opening it up to that extent, unless you have a very wideband signal, wouldn’t work. My solution is to use the frequency translating FIR fi… --- ## [A 60GHz front-end for your SDR (e.g. USRP)](https://www.ruby-forum.com/t/a-60ghz-front-end-for-your-sdr-e-g-usrp/234867)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 1, 2014, 4:50pm UTC](https://www.ruby-forum.com/t/a-60ghz-front-end-for-your-sdr-e-g-usrp/234867 "2014-12-01T16:50:37Z")
Hi List, Ramin Fardi at Bluewave microsystems and myself Per Z. have developed a 60GHz front-end (and code) for use with SDRs in particular USRP. The design is completely open. We will publish full documentation on i… --- ## [Best Resample Method For Resampling LTE Data](https://www.ruby-forum.com/t/best-resample-method-for-resampling-lte-data/234855)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 5\ **Last updated:** [December 1, 2014, 3:45pm UTC](https://www.ruby-forum.com/t/best-resample-method-for-resampling-lte-data/234855 "2014-12-01T15:45:42Z")
Hi, I’m currently using the Rational Resampler in GUNURADIO to resample LTE data, for example from 30.72MHz to 15.36MHz and 50MHz to 15.36MHz. I\`m able to decode the data, so every thing seems to be well. I chose th… --- ## [Segfault](https://www.ruby-forum.com/t/segfault/233270)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [December 1, 2014, 2:55pm UTC](https://www.ruby-forum.com/t/segfault/233270 "2014-12-01T14:55:20Z")
Hi to all. This is my first post here…i hope to have choosen the right place to ask… I’m currently trying to compile gqrx and gnuradio…everything went well, but when i run gqrx it won’t start and give me this error: … --- ## [Uhd driver](https://www.ruby-forum.com/t/uhd-driver/233281)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 30, 2014, 9:10pm UTC](https://www.ruby-forum.com/t/uhd-driver/233281 "2014-11-30T21:10:28Z")
I want to check some signal in fpga, so generate the bit stream file, and burn it by JTAG, Moinitor some signal in the chipscope Then, burning is finished, receiver program (gnuradio) in computer is running well, but … --- ## [Sampling slowly](https://www.ruby-forum.com/t/sampling-slowly/234864)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 4\ **Last updated:** [November 30, 2014, 6:34pm UTC](https://www.ruby-forum.com/t/sampling-slowly/234864 "2014-11-30T18:34:33Z")
Looking for help I have written a source block to do satellite predictions. It acts as a source of a float representing the input parameter - e.g. elevation. The block probes predict via UDP, looks at the string retur… --- ## [Announcing new gr-gsm project](https://www.ruby-forum.com/t/announcing-new-gr-gsm-project/234858)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 30, 2014, 3:07pm UTC](https://www.ruby-forum.com/t/announcing-new-gr-gsm-project/234858 "2014-11-30T15:07:09Z")
Dear all, I was working for some time on a project of a set of GNU Radio tools for receiving GSM transmissions. As the project reached the point where it might be useful for the community I have decided to officially … --- ## [How to resolve the uhd warning of sample rate](https://www.ruby-forum.com/t/how-to-resolve-the-uhd-warning-of-sample-rate/233257)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 30, 2014, 7:47am UTC](https://www.ruby-forum.com/t/how-to-resolve-the-uhd-warning-of-sample-rate/233257 "2014-11-30T07:47:18Z")
Dear All, I am using USRP1 having RF daughterboards WBX (50Mhz -2.2Ghz). I have gone through some basic details of the USRP1 product features but dont know how to resolve the errors oh UHD warning saying the hardware … --- ## [Doppler correction](https://www.ruby-forum.com/t/doppler-correction/233268)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 29, 2014, 6:44pm UTC](https://www.ruby-forum.com/t/doppler-correction/233268 "2014-11-29T18:44:13Z")
Hello, I’m using GNU Radio companion to try to receive a satellite signal in S band. As I have read with a doppler shift will be around ~60kHz. This will affect both the carrier frequency as well as the baseband sign… --- ## [Successful transmission in gr-ieee802-11 with adding extra samples (before OFDM preamble)](https://www.ruby-forum.com/t/successful-transmission-in-gr-ieee802-11-with-adding-extra-samples-before-ofdm-preamble/233264)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [November 29, 2014, 12:50pm UTC](https://www.ruby-forum.com/t/successful-transmission-in-gr-ieee802-11-with-adding-extra-samples-before-ofdm-preamble/233264 "2014-11-29T12:50:52Z")
Hi, I am using gr-ieee-802-11 and putting a custom block, which is responsible for adding a 90-sample preamble at the head of incoming sample stream, right after the output of WiFi PHY Hier, as attached figure, gene… --- ## [Fractional delay in fractional resampler block](https://www.ruby-forum.com/t/fractional-delay-in-fractional-resampler-block/233029)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [November 28, 2014, 6:13pm UTC](https://www.ruby-forum.com/t/fractional-delay-in-fractional-resampler-block/233029 "2014-11-28T18:13:50Z")
Hello, I have in my project a sample rate of 10.23 million samples per second and I need to delay the signal ±1ns. With GNURadio block delay I can delay the signal 97.75ns (1 / 10,230,000 -\> + - one sample). Could … --- ## [Latency of tcpip transmission](https://www.ruby-forum.com/t/latency-of-tcpip-transmission/233259)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [November 28, 2014, 3:00pm UTC](https://www.ruby-forum.com/t/latency-of-tcpip-transmission/233259 "2014-11-28T15:00:48Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Recording external events timestamps](https://www.ruby-forum.com/t/recording-external-events-timestamps/234848)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 27, 2014, 1:53pm UTC](https://www.ruby-forum.com/t/recording-external-events-timestamps/234848 "2014-11-27T13:53:51Z")
Hello, I have an application where I acquire and process data through GNURadio while I modify some system parameters via slow controls (USB, GPIB, or network interfaces) handled in a separate python thread. I would l… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=41) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=43)