# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=59 [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:** 60 --- ## [Spectrum sensing Simulation Only](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 31, 2014, 3:01pm UTC](https://www.ruby-forum.com/t/spectrum-sensing-simulation-only/231242 "2014-07-31T15:01:06Z")
Hello Everyone I am a new to gnuradio. I would like to do simulation of spectrum sensing (Simple energy detector with single band only). Normally I have seen “usrp\_spectrum\_sense.py”. However, that is written for USR… --- ## [Increasing output power from lftx with resistor mod gives saturated output](https://www.ruby-forum.com/t/increasing-output-power-from-lftx-with-resistor-mod-gives-saturated-output/231263)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 30, 2014, 11:02pm UTC](https://www.ruby-forum.com/t/increasing-output-power-from-lftx-with-resistor-mod-gives-saturated-output/231263 "2014-07-30T23:02:41Z")
Hello- I have attempted to increase the output power from my Rev 2.2 LFTX as per instructions from Matt E. on this list dated Aug 3 2013 in which he suggests reducing the values of resistors R3 and R5, but I am seeing … --- ## [Re Spectrum sensing Simulation Only](https://www.ruby-forum.com/t/re-spectrum-sensing-simulation-only/231259)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 30, 2014, 9:41pm UTC](https://www.ruby-forum.com/t/re-spectrum-sensing-simulation-only/231259 "2014-07-30T21:41:06Z")
Hello Martin Thank you for the help. I try to run “specest\_noisy\_sinusoid\_mtm.py” (Python script is also okey for me). However it does not run “it says no module specest”. By the way I am using windows 8 OS. My goal… --- ## [Increasing output power from lftx with resistor mod gives saturated output](https://www.ruby-forum.com/t/increasing-output-power-from-lftx-with-resistor-mod-gives-saturated-output/231261)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 30, 2014, 9:39pm UTC](https://www.ruby-forum.com/t/increasing-output-power-from-lftx-with-resistor-mod-gives-saturated-output/231261 "2014-07-30T21:39:54Z")
Hello- I have attempted to increase the output power from my Rev 2.2 LFTX as per instructions from Matt E. on this list dated Aug 3 2013 in which he suggests reducing the values of resistors R3 and R5, but I am seeing … --- ## [Tx\_ofdm.grc start\_of\_burst end\_of\_burst](https://www.ruby-forum.com/t/tx-ofdm-grc-start-of-burst-end-of-burst/231246)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [July 30, 2014, 6:26pm UTC](https://www.ruby-forum.com/t/tx-ofdm-grc-start-of-burst-end-of-burst/231246 "2014-07-30T18:26:05Z")
Hi all: I know a packet in the example tx\_ofdm.grc include a preamble,a header,the payload and crc value.Recently I have used the UHD API to send packet.And I want to know whether the tx\_ofdm.grc add start\_of\_burst a… --- ## [Messages and flow-graph termination](https://www.ruby-forum.com/t/messages-and-flow-graph-termination/231251)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 30, 2014, 4:49pm UTC](https://www.ruby-forum.com/t/messages-and-flow-graph-termination/231251 "2014-07-30T16:49:45Z")
Hello, as soon as I introduce a pair of block publishing and consuming messages, the GNURadio scheduler (version 3.7.2) does not terminate the execution of the flow-graph when the stream sources signal the end of the… --- ## [Port flowgraph from Python to C++](https://www.ruby-forum.com/t/port-flowgraph-from-python-to-c/234812)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 30, 2014, 4:06pm UTC](https://www.ruby-forum.com/t/port-flowgraph-from-python-to-c/234812 "2014-07-30T16:06:17Z")
Hello, I was able to create a flowgraph in GRC to demodulate a signal (low-frequency battery telegram of wireless microphones). Now I started to port the generated code from Python to C++. I had to realize that some … --- ## [Ofdm channel estimation](https://www.ruby-forum.com/t/ofdm-channel-estimation/231250)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 30, 2014, 4:05pm UTC](https://www.ruby-forum.com/t/ofdm-channel-estimation/231250 "2014-07-30T16:05:41Z")
Hi Martin: Greeting from xd.Thank you so much for your example tx\_ofdm.grc and rx\_ofdm.grc.I want to ask a question about channel estimation.And I know that the channel estimate is on a tag.But I want to make some ch… --- ## [Slow control external hardware](https://www.ruby-forum.com/t/slow-control-external-hardware/231238)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [July 30, 2014, 3:43pm UTC](https://www.ruby-forum.com/t/slow-control-external-hardware/231238 "2014-07-30T15:43:05Z")
Hello, I need to control a RF synthesizer from within a GNURadio flowchart updating some parameters on the base of some measurements obtained from processing data collected by an USRP. The synthesizer is connected th… --- ## ["fusb::\_submit\_urb: Cannot allocate memory" Hardware integration](https://www.ruby-forum.com/t/fusb-cannot-allocate-memory-hardware-integration/231239)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 29, 2014, 9:11pm UTC](https://www.ruby-forum.com/t/fusb-cannot-allocate-memory-hardware-integration/231239 "2014-07-29T21:11:48Z")
Good afternoon, Disclaimer: New to everything related to GnuRadio. Summary: Receiving the following error: “fusb::\_submit\_urb: Cannot allocate memory” Using GnuRadio with gnss-sdr source block and a WX GUI FFT Sink … --- ## [Re: Error in OP25 Decoder block](https://www.ruby-forum.com/t/re-error-in-op25-decoder-block/231240)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 29, 2014, 6:40pm UTC](https://www.ruby-forum.com/t/re-error-in-op25-decoder-block/231240 "2014-07-29T18:40:13Z")
Max - Thanks a bunch for the new P25-2 code. I have been trying to figure out how to compile and use your new .py modules to play audio, but I just don’t know enuff Linux to get it done. I did use the rtl\_sdr app to … --- ## [FW: GNU Radio Calling Registers](https://www.ruby-forum.com/t/fw-gnu-radio-calling-registers/231229)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 29, 2014, 5:58pm UTC](https://www.ruby-forum.com/t/fw-gnu-radio-calling-registers/231229 "2014-07-29T17:58:31Z")
Hello All, I am going through the process of decimating a signal in my FPGA code. In the Verilog code I will make use of the add\_routing\_header module in vita\_rx\_chain.v. I found this link regarding the FPGA register… --- ## [Image Reading and Writing in GNU Radio](https://www.ruby-forum.com/t/image-reading-and-writing-in-gnu-radio/231232)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 29, 2014, 10:28am UTC](https://www.ruby-forum.com/t/image-reading-and-writing-in-gnu-radio/231232 "2014-07-29T10:28:39Z")
Dear all, I want to transmit an image over wireless link, so I need two blocks: + one for reading grayscale image and giving out a bit stream+ the other one take a bit stream as input and rebuild the image Is there a… --- ## [Persistence Checkbox of WX GUI Scope Plot](https://www.ruby-forum.com/t/persistence-checkbox-of-wx-gui-scope-plot/231209)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 29, 2014, 7:18am UTC](https://www.ruby-forum.com/t/persistence-checkbox-of-wx-gui-scope-plot/231209 "2014-07-29T07:18:38Z")
Dear Sir, It is found that in newer version of gnuradio, the WX GUI Scope Sink doesn’t have a “Persistence” checkbox. In this case how to get back the feature …? --- ## [New WX GUI Scope Sink](https://www.ruby-forum.com/t/new-wx-gui-scope-sink/231211)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 29, 2014, 7:14am UTC](https://www.ruby-forum.com/t/new-wx-gui-scope-sink/231211 "2014-07-29T07:14:18Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Fwd: Problem with large number of inputs](https://www.ruby-forum.com/t/fwd-problem-with-large-number-of-inputs/231224)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 28, 2014, 4:52pm UTC](https://www.ruby-forum.com/t/fwd-problem-with-large-number-of-inputs/231224 "2014-07-28T16:52:51Z")
\---------- Forwarded message ---------- From: Mostafa A. removed\_email\_address@domain.invalid Date: Mon, Jul 28, 2014 at 7:21 PM Subject: Re: \[Discuss-gnuradio\] Problem with large number of inputs. To: Activecat remo… --- ## [Spectrum record](https://www.ruby-forum.com/t/spectrum-record/231218)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 28, 2014, 10:28am UTC](https://www.ruby-forum.com/t/spectrum-record/231218 "2014-07-28T10:28:53Z")
Hi Marcus, list, Thanks for swift response. You are right about openBTS, but at the same time I am using really old system (12.04) havent formatted for years due to its required installation, which can turn into rea… --- ## [How to split an image or video into a number of packets?](https://www.ruby-forum.com/t/how-to-split-an-image-or-video-into-a-number-of-packets/231219)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 28, 2014, 10:27am UTC](https://www.ruby-forum.com/t/how-to-split-an-image-or-video-into-a-number-of-packets/231219 "2014-07-28T10:27:26Z")
Hi all, I want to transmit an image/video from one node to another node using GNUradio, but I don’t know how to divide an image or video into multiple packets. I want to make it real time in the sense that an image/vi… --- ## [Top block larger than screen](https://www.ruby-forum.com/t/top-block-larger-than-screen/231221)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 28, 2014, 9:30am UTC](https://www.ruby-forum.com/t/top-block-larger-than-screen/231221 "2014-07-28T09:30:47Z")
I am a completely newbie in GNURadio. I installed Kali Linux with GNURadio companion. When I want to execute a flow graph the window containing Wideband Spectrum and Channel Spectrum is longer than my laptop screen an… --- ## [Problem with large number of inputs](https://www.ruby-forum.com/t/problem-with-large-number-of-inputs/231199)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [July 28, 2014, 6:18am UTC](https://www.ruby-forum.com/t/problem-with-large-number-of-inputs/231199 "2014-07-28T06:18:22Z")
Hi all, I’ve used to have a block with large number of inputs, say 24, but I think GNURadio has a problem with memory allocation because when I use the block it’s suddenly jump out of the program with “The program … --- ## [Gr-fec LDPC comments / questions](https://www.ruby-forum.com/t/gr-fec-ldpc-comments-questions/231184)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 27, 2014, 10:23pm UTC](https://www.ruby-forum.com/t/gr-fec-ldpc-comments-questions/231184 "2014-07-27T22:23:13Z")
Hi, I’ve been looking at the LDPC code and I have a few comments / questions : Memory management seems to be lacking. I see only 3 calls to gsl\_matrix\_free but much more matrices being allocated and create by oper… --- ## [OpenGL.error when there are to many WX GUI elements on the screen](https://www.ruby-forum.com/t/opengl-error-when-there-are-to-many-wx-gui-elements-on-the-screen/231212)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 27, 2014, 5:04pm UTC](https://www.ruby-forum.com/t/opengl-error-when-there-are-to-many-wx-gui-elements-on-the-screen/231212 "2014-07-27T17:04:57Z")
After lots of problems I got GNURadio working (more or less) on Arch Linux. Now I have a problem with the WX GUI FFT SINK: Traceback (most recent call last): File “/usr/lib/python2.7/site-packages/gnuradio/wxgui/plo… --- ## [Narrowband Tunnel.py Error](https://www.ruby-forum.com/t/narrowband-tunnel-py-error/231171)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [July 27, 2014, 5:03pm UTC](https://www.ruby-forum.com/t/narrowband-tunnel-py-error/231171 "2014-07-27T17:03:16Z")
I am currently running GNU Radio 3.7.4 and I am getting an error running the stock narrowband tunnel.py script. This is what I am getting: \[root@cobra narrowband\]# ./tunnel.py -f 146.0M -a addr=“10.2.8.104” linux; GNU… --- ## [Spectrum record](https://www.ruby-forum.com/t/spectrum-record/231202)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 27, 2014, 1:34pm UTC](https://www.ruby-forum.com/t/spectrum-record/231202 "2014-07-27T13:34:58Z")
Hi list, I want to record a 5MHz wide bandwidth with usrp1 (equipped with dbsrx1 and modified clock @ 52MHz), can anyone guide me how to do this, I am using usrp\_rx\_cfile (using gnuradio-3.4.2 for special purpose) wi… --- ## [Comments on stream tags and metadata storage](https://www.ruby-forum.com/t/comments-on-stream-tags-and-metadata-storage/231035)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 15\ **Last updated:** [July 26, 2014, 5:52pm UTC](https://www.ruby-forum.com/t/comments-on-stream-tags-and-metadata-storage/231035 "2014-07-26T17:52:14Z")
Some comments after playing with stream tags and metadata this afternoon. (1) Although the discussion of stream tag insertion hints that this should be done within the scheduler’s call to work() it could be more clea… --- ## [Usrp - gnuradio agc](https://www.ruby-forum.com/t/usrp-gnuradio-agc/231179)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 26, 2014, 9:15am UTC](https://www.ruby-forum.com/t/usrp-gnuradio-agc/231179 "2014-07-26T09:15:03Z")
Hi at all, I need to implement an AGC to adapt the signal to the ADC’s full dynamics. I work with an USRP N210 with CBX-40USRP DAUGHTERBOARD… I investigated that : There is a programmable gain amplifier (PGA) before… --- ## [Reconfiguring Flowgraphs](https://www.ruby-forum.com/t/reconfiguring-flowgraphs/234810)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 9\ **Last updated:** [July 26, 2014, 9:04am UTC](https://www.ruby-forum.com/t/reconfiguring-flowgraphs/234810 "2014-07-26T09:04:15Z")
Hi all: Thank you in advance.I want to ask some questions about the “Reconfiguring Flowgraphs”. My flowgraphs: source—\>block A(just one block)—\>sink And I want to run the flowgraphs for 30 seconds,and then run the … --- ## [DVB-S2X update to gr-dvbs2](https://www.ruby-forum.com/t/dvb-s2x-update-to-gr-dvbs2/231188)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 26, 2014, 2:56am UTC](https://www.ruby-forum.com/t/dvb-s2x-update-to-gr-dvbs2/231188 "2014-07-26T02:56:14Z")
gr-dvbs2 has been updated to include all of the normal frame size code rates, roll-off factors and constellations in the DVB-S2 extension specification, DVB-S2X. Note that gr-dvbs2 is transmit only. https://www.dvb.… --- ## [\[coproc\] The next Co-Processors WG Call](https://www.ruby-forum.com/t/coproc-the-next-co-processors-wg-call/231185)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 26, 2014, 12:18am UTC](https://www.ruby-forum.com/t/coproc-the-next-co-processors-wg-call/231185 "2014-07-26T00:18:53Z")
I’d like to setup another Co-Processors WG call in the next couple of weeks any one interested in attending should vote on the date/time at: WhenIsGood: GNURadio Co-processor WG Call Somewhere in the Aug. 11 - Aug.… --- ## [\[GSoC\] Co-Processors Update #7](https://www.ruby-forum.com/t/gsoc-co-processors-update-7/231169)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [July 25, 2014, 6:51pm UTC](https://www.ruby-forum.com/t/gsoc-co-processors-update-7/231169 "2014-07-25T18:51:00Z")
Hello all, Logistical: When is the next coproc call??? Mentor Philip is on vacation for a few weeks :frowning: Progress: Bad news is that I’ve given up on the FFTC. The conflict of resources in the resource man… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=58) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=60)