[Discuss-gnuradio] European GNU Radio Days contribution deadline (March 21st)

2019-03-18 Thread jean-michel.fri...@femto-st.fr
The European GNU Radio Days contribution deadline is getting close (set to March 21st). Please consider contributing if you wish to share the results of your work either as oral presentation, demonstration or tutorial. The template and submission site are available at

Re: [Discuss-gnuradio] Tuning in VLF with a sound card

2019-05-02 Thread jean-michel.fri...@femto-st.fr
reading your email more closely: * the sound card generates real data with an even spectrum with components at w and -w * you transfer from VLF band to baseband by multiplying by a complex NCO exp(-jwt) with t=[0:length(samples)]/fs when sampling at fs * the -w component is shifted to -2w that

Re: [Discuss-gnuradio] Tuning in VLF with a sound card

2019-05-02 Thread jean-michel.fri...@femto-st.fr
https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017RS006420 or http://jmfriedt.free.fr/agu_dcf77.pdf We are currently working on simultaneously decoding (e)LORAN/MSF, TDF & DCF77 v.s GPS with a sound card. JM -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000

[Discuss-gnuradio] gr_zeromq on MS-Windows ?

2019-04-17 Thread jean-michel.fri...@femto-st.fr
When running a GNU/Linux VirtualBox on MS-Windows, I whish to make GNU Radio running on the guest OS (GNU/Linux) communicate with GNU Radio running on the host OS (MS-Windows) through ZeroMQ. Has anyone tested the proper operation of the ZeroMQ libraries provided with the MS-Windows port [1] of

[Discuss-gnuradio] OpenCL FFT synchronization question

2019-08-16 Thread jean-michel.fri...@femto-st.fr
As I am investigating GPU and OpenCL for acceerating correlation computations, I thought I'd give OpenCL-Enabled FFT block in GNU Radio Companion (still version 3.7.13.4) a try to see if I can see any performance change. When I run signal source -> throttle -> OpenCL FFT -> time sink, all goes

Re: [Discuss-gnuradio] CMake macros & definitions for GR 3.8

2019-08-20 Thread jean-michel.fri...@femto-st.fr
since the name of the original author sounds French, a manuscript being finalized on writing OOT block including porting to GNU Radio 3.8 or native gr_modtool for GR3.8 is at http://jmfriedt.free.fr/gr_oscilloscope.pdf [in French, draft version]. I will translate to English once finalized and

Re: [Discuss-gnuradio] Building GNU Radio on Fedora 30 with pybomb to get a 3.8 installation

2019-09-01 Thread jean-michel.fri...@femto-st.fr
> pybombs prefix init ~/gnuradio -R gnuradio-default gnuradio-default.lwr recipe is 3.7. Edit the recipe in .pybombs/recipes/gr-recipes and replace gnuradio with (in order to call gnuradio38.lwr) depends: - gnuradio38 and in gnuradio38.lwr gitbranch: master -> gitrev: v3.8.0.0 (since

Re: [Discuss-gnuradio] [VOLK][announcement] VOLK release impeding

2019-07-31 Thread jean-michel.fri...@femto-st.fr
> It took about eight hours total. I would hope this list would stop promoting building on the target embedded system. Embedded system development should never, ever, attempt compiling on the low power target but rather figure out how to cross-compile from the powerful host for generating

[Discuss-gnuradio] European GNU Radio Days videos

2019-07-17 Thread jean-michel.fri...@femto-st.fr
The videos of the European GNU Radio Days oral presentations and tutorials are now available online: Marcus' keynote presentation: https://mediacenter.ens2m.fr/videos/?video=MEDIA190710141050023 First day oral presentations (morning):

European GNU Radio Days 2020 (June 22-23, 2020): call for contributions

2019-11-06 Thread jean-michel.fri...@femto-st.fr
Dear GNU Radio community members, we are organizing the third edition of the European GNU Radio Days 2020, to be held in Poitiers (France) June 22 & 23rd, 2020. We are seeking contributions: oral presentations, posters, demonstrations, tutorials. A two-page abstract would allow us to select

UHD: USRP source issue when using 2 channels

2019-11-21 Thread jean-michel.fri...@femto-st.fr
Am I the only one facing an issue with fetching data from 2 channels of a B210 receiver ? When addressing a single channels (USRP Source -> file sink) all goes well, but whenever I activate a second channel (Num Mboards=1, Num Channels=2) I get an error message tb = top_block_cls() File

Re: UHD: USRP source issue when using 2 channels

2019-11-21 Thread jean-michel.fri...@femto-st.fr
ror: IndexError: multi_usrp: RX channel >> 140641462873248 out of range for configured RX frontends >> >>>>> Done (return code 1) >> >> Ron >> >> On 11/21/19 00:43, jean-michel.fri...@femto-st.fr wrote: >> Am I the only one facing an issue w

European GNU Radio Days call for paper: 1 month left

2020-02-29 Thread jean-michel.fri...@femto-st.fr
The submission site for contributing to the European GNU Radio Days, to be held in Poitiers (France) June 22nd & 23rd, is now open. A two-page abstract will help the organizing committee select between oral presentation, poster presentation or demonstration. The deadline for contribution

Re: Accurate GPIO Clock

2020-03-01 Thread jean-michel.fri...@femto-st.fr
welcome to the field of real time operating systems. There are a few thousand pages about the latencies introduced by the scheduler in non-real time OS, the first google hit being https://www.veterobot.org/2012/04/precise-pwms-with-gpio-using-xenomai.html A few microseconds is not too bad

Re: quantization noise demonstration ?

2020-02-16 Thread jean-michel.fri...@femto-st.fr
My mistake ... my noise level was far too high. Additionnally, the noise with amplitude lower than LSB must be added to a full-scale range sine wave to be dithered amongst the various quantization bins. If anyone is interested, I updated http://jmfriedt.org/quantization.pdf which (I believe)

RFC: clock synchronization on AFSK modulated signal

2020-04-06 Thread jean-michel.fri...@femto-st.fr
Thanks to the help I received during the week end, I completed the update on gr-acars. One thing I realized when working on PSK modulations (e.g RDS) is the importance of bitrate clock synchronization. After investigating the M algorithm, possibly because of my misunderstanding of its

USRP LO stabilization time ?

2020-04-14 Thread jean-michel.fri...@femto-st.fr
I am considering frequency sweeping a PlutoSDR and a B210, both fitted with AD936x RF frontends. As I was writing the application and reading the libuhd documentation, I read at https://files.ettus.com/manual/page_general.html "After tuning, the RF front-end will need time to settle into a usable

European GNU Radio Days: contribution submission

2020-04-01 Thread jean-michel.fri...@femto-st.fr
The initial deadline for contributing to the European GNU Radio Days conference https://gnuradio-eu-20.sciencesconf.org/ is supposed to be today. In these uncertain times, some might be hesitant to spend time summarizing the result of their work: since no official guideline has been issued for

linking with GNU Radio FFT library

2020-04-05 Thread jean-michel.fri...@femto-st.fr
gr-acars is working very well with GNU Radio 3.8, all good. Now I'd like to add two improvements: being able to run multiple processing blocks in parallel (on multiple channels, which libfftw seems hardly able to do due to the non-threadable plan creation) and getting rid of the external FFTW

accumulating samples for processing ?

2020-04-05 Thread jean-michel.fri...@femto-st.fr
I am using the opportunity of porting gr-acars to GNU Radio 3.8 to re-write the processing algorithm. As part of this reorganization, I want to analyze the baseline standard deviation and detect the AM modulated message as a rise in standard deviation (ie custom squelch). Since there is hardly

Re: accumulating samples for processing ?

2020-04-05 Thread jean-michel.fri...@femto-st.fr
for an > example. > > https://lists.gnu.org/archive/html/discuss-gnuradio/2019-08/msg00188.html > > Ron > > On 4/5/20 01:36, jean-michel.fri...@femto-st.fr wrote: > >> I am using the opportunity of porting gr-acars to GNU Radio 3.8 to >> re-write the processing

Re: linking with GNU Radio FFT library

2020-04-05 Thread jean-michel.fri...@femto-st.fr
works like a charm with these, had missed the update in the lib/ configuration file. Thanks a lot, JM -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000 Besancon, France April 5, 2020 3:29 PM, "Sylvain Munaut" <246...@gmail.com> wrote: > Hi JM, > > In CMakeList.txt:

Re: looking for a mode-S ADS-B recorded signal

2020-04-06 Thread jean-michel.fri...@femto-st.fr
luckily for you I was just saving some ADS-B records for direction of arrival measurement. The data was collected April 2nd so already very few planes over French airspace. A short sample has just been uploaded to http://jmfriedt.org/adsb_2000kSps2_1uint8_10Msamples.bin in unsigned char complex

GNU Radio on Android

2020-04-23 Thread jean-michel.fri...@femto-st.fr
Since I have little else to do at the moment than playing with my phone, I debugged the USB OTG port of my Sony Z5, which led me to install the rtl-sdr driver, which led me to install some non-GNU Radio application to test the SDR capability of the phone, and it works. I haven't learnt anything in

Re: USRP LO stabilization time ?

2020-04-14 Thread jean-michel.fri...@femto-st.fr
re frontend. What is causing the extra delay I can only > guess but perhaps > communication overhead is the culprit. > > Regards, > Sebastian > > Den tis 14 apr. 2020 kl 13:40 skrev jean-michel.fri...@femto-st.fr > : > >> I am considering frequency sweeping

Re: Sound card input & output synchronization ?

2020-05-19 Thread jean-michel.fri...@femto-st.fr
Thank you Sylvain: as this is a new computer, I had not installed pulseaudio. It seems the "default" Alsa backend indeed drops frames. I installed pulseaudio and running in debug mode (-) I cannot see frame size updates but most importantly my records are now continuous, problems solved.

Re: Gnuradio 3.8 on a Raspberry pi 4 B?

2020-05-24 Thread jean-michel.fri...@femto-st.fr
I have uploaded http://jmfriedt.org/sdcard.img my Buildroot image generated for RPi4 that I have been using daily for the last 2 months, so pretty sure it is working. Actually it is 1.1 GB because of lapack needed for gnss-sdr but GNU Radio 3.8/Python3 will only require about 500 MB. Gwenhael

Re: Gnuradio 3.8 on a Raspberry pi 4 B?

2020-05-28 Thread jean-michel.fri...@femto-st.fr
t. The password is accepted and > I’ve looked around. > > Gnuradio seems to be installed, but not the xwindow system. > > How do you use gnuradio-companion etc? > > I could not find “xstartup” or some such program. > > Thanks > > Glen > >> On May 24, 202

Re: Gnuradio 3.8 on a Raspberry pi 4 B?

2020-05-29 Thread jean-michel.fri...@femto-st.fr
> 25000 Besancon, France >> >> May 29, 2020 3:33 AM, "Glen Langston" wrote: >> >>> Hi >>> >>> Thanks for your help. >>> >>> I’ve written the image to an SDCARD and the PI4 boots to >>> the command line prompt.

Gnuradio 3.8 on embedded [ARM] systems

2020-05-26 Thread jean-michel.fri...@femto-st.fr
As I am annoyed by the constant reminder of compiling such a complex piece of software as GNU Radio and associated libraries on the target embedded ARM system (lack of optimization of the binary distribution tuned for the lowest performance target, damaging the mass-storage SD card medium,

Re: Compiling/installing GNURadio for the STM32MP157C-EV1 board (STM32MP1 processor)

2020-06-05 Thread jean-michel.fri...@femto-st.fr
about +/- 30 milliseconds. I now think this is due to circular buffers > in Gnuradio. > (still to be determined). > > So, to conclude this long email, it would be fantastic to learn how to use > Buildroot to figure out > how > to program Gnuradio on the PlutoSDR. There are som

Re: Compiling/installing GNURadio for the STM32MP157C-EV1 board (STM32MP1 processor)

2020-06-04 Thread jean-michel.fri...@femto-st.fr
I have followed https://bootlin.com/blog/building-a-linux-system-for-the-stm32mp1-basic-system/ to generate the STM32MP157 cross-compilation framework. Once the Buildroot environment is functional, you can follow https://github.com/oscimp/PlutoSDR/tree/master/doc to add GNU Radio support including

Re: Radar Project - BladeRF2.0

2020-06-24 Thread jean-michel.fri...@femto-st.fr
SDR based RADAR will be discussed at 6:30 PM European time as announced at https://2020.sdra.io/pages/programme.html The slides are at http://jmfriedt.free.fr/sdra_radar.pdf RThe reference on slide 17 explains how to switch LO frequency without stopping the data stream when using osmosdr. Not

Re: GPIO lines on RPi4

2020-06-27 Thread jean-michel.fri...@femto-st.fr
est practices so that it doesn't go unused, either, so: > > Assuming you're using GNU Radio 3.8.1.0 (or later, once we release > something), you can make use of the "Python Snippets" in GRC. > > Cheers, > Marcus > > On 18/06/2020 23.17, Marcus D. Leech wrote:

Re: GPIO lines on RPi4

2020-06-22 Thread jean-michel.fri...@femto-st.fr
ctices so that it doesn't go unused, either, so: >> >> Assuming you're using GNU Radio 3.8.1.0 (or later, once we release >> something), you can make use of the "Python Snippets" in GRC. >> >> Cheers, >> Marcus >> >> On 18/06/2020 23.17, Marc

Re: GPIO lines on RPi4

2020-06-18 Thread jean-michel.fri...@femto-st.fr
My approach: * build your grc chart from GNU Radio Companion and generate the .py file * edit the py file and import pygpio * play with the RPi4 GPIO in your python script. See attached script, with a python server included in the Python script to control an RF switch from a GNU Octave TCP/IP

Re: GPIO lines on RPi4

2020-06-30 Thread jean-michel.fri...@femto-st.fr
elease > something), you can make use of the "Python Snippets" in GRC. > > Cheers, > Marcus > > On 18/06/2020 23.17, Marcus D. Leech wrote: > >> On 06/18/2020 03:54 PM, jean-michel.fri...@femto-st.fr wrote: >>> My approach: >>> * build your grc char

Re: Making C++ OOT module and wish to set up a parameter with different choices!

2020-06-30 Thread jean-michel.fri...@femto-st.fr
I do not claim to cover all aspect of OOT blocks but I tried to document the basics of passing parameters and public/private variables at http://jmfriedt.free.fr/gr_oscilloscope_eng.pdf Unfortunately this document only covers GNU Radio 3.7: while the French version was extended to GNU Radio

Re: GPIO lines on RPi4

2020-07-17 Thread jean-michel.fri...@femto-st.fr
class can be accessed and indeed, changing the signal source frequency does lead to a change in the displayed spectrum. JM -- JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000 Besancon, France June 30, 2020 10:10 AM, jean-michel.fri...@femto-st.fr wrote: > Thanks to this

aliasing with X310 BasicRX (higher order Nyquist zone) ?

2020-07-20 Thread jean-michel.fri...@femto-st.fr
I'd like to analyze a higher Nyquist zone with a X310 fitted with a BasicRX: trying to listen at 143.5 MHz (GRAVES), I can transpose by 100 MHz but am still far from the ~8 MS/s sampling I can use on the Gb Ethernet interface. Since the signal is only in the third Nyquist zone, I'd like to tell

Re: aliasing with X310 BasicRX (higher order Nyquist zone) ?

2020-07-20 Thread jean-michel.fri...@femto-st.fr
y 20, 2020 5:43 PM, "Brian Padalino" wrote: > On Mon, Jul 20, 2020 at 11:32 AM jean-michel.fri...@femto-st.fr > > wrote: > >> Indeed second Nyquist zone before decimation. >> My thought was >> 143.05 MHz -> transpose by 100 MHz using the DDC (NCO at

Re: aliasing with X310 BasicRX (higher order Nyquist zone) ?

2020-07-20 Thread jean-michel.fri...@femto-st.fr
edt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, 25000 Besancon, France July 20, 2020 5:20 PM, "Marcus D. Leech" wrote: > On 07/20/2020 07:37 AM, jean-michel.fri...@femto-st.fr wrote: > >> I'd like to analyze a higher Nyquist zone with a X310 fitted with a