Re: [Discuss-gnuradio] DOPPLER SHIFT

Dear Marcus,Thank you very much for reply!This might be for the fact, I being new to these‎. However, in summary, please this is what I am and want to do 1) I have to track Satellite to receive CW signal. 2) I am

Re: [Discuss-gnuradio] [USRP-users] Switching and high spike in spectrum

Hi Bob, I came up with the same issue and I hope the DC leakage from Tx should disappear right after the Tx burst is finished, but acturally I still saw the strong DC during the pure Rx time lot. Have you got a solution for that? Thanks. Br, Hanwen 2014-10-31 7:31 GMT+01:00 bob wole

[Discuss-gnuradio] GRC window is expanding to the right as the graph runs...

I observed this weird phenomenon with wx GUI static text: as the program runs the text is sliding to the right, evenually going outside the window... I attach a very simple grc file (run it and increase the window to see the effect) any thoughts? thanks Achilleas test_expanding_window.grc

Re: [Discuss-gnuradio] Issue during installation

Hi Harold, If you go up a few lines, the cmake process will tell you what was missing. This looks like you were missing important build-time dependencies, i.e. libraries and development headers. How are you building GNU Radio? What platform/distro? Generally, the information you're giving isn't

[Discuss-gnuradio] Issue during installation

Hi, I encounter gnuradio-companion is not enabled during my gnuradio installation. Can you please help this ? I am not sure what I miss. Thanks, Harold - ## -- # Gnuradio disabled components --

Re: [Discuss-gnuradio] DOPPLER SHIFT

well, kind of I think you're confusing different things: * Hardware: Your HackRF has the job of tuning to a center frequency, things like gain and giving you a lot of signal samples from there. * Doppler Tracking: There's software that can calculate the doppler a signal has that comes from a

Re: [Discuss-gnuradio] DOPPLER SHIFT

Thank you much Marcus,I tried reading on internet about libHackRf but no introductions. However, from your comment, I suggest it means I can connect HackRf to tracking software doppler using LibHackRf! Is that

Re: [Discuss-gnuradio] DOPPLER SHIFT

Dear Ernest, Haven't used that, but hamlib is something completely different than Gpredict; it's meant to control ham radio equipment, not to predict doppler shift. If I can get that right from quickly having a glimpse at hamlib, it seems like it was written for hardware that connects to (or

Re: [Discuss-gnuradio] DOPPLER SHIFT

Hi Marcus and All Thank you very much for your replyApart from Gpredict, which other way could I use for doppler shifting for satellite tracking. Please what do you say about Hamlib?‎ Which other method can I use

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

Dan, This is HF, but similar concept of a low cost receiver, with integrated GPS, tacked onto a single board computer. https://www.kickstarter.com/projects/1575992013/kiwisdr-beaglebone-software-defined-radio-sdr-with Lou -- View this message in context:

Re: [Discuss-gnuradio] 1PPS Synchronization - File Meta Sink Data

Hi Michael, If you are working with metadata and timestamps, I think the gr-analysis module may be of use to you. As for your particular question, my understanding is that the 1PPS provides the timestamp information present in the metadata. So I would suppose the (possibly interpolated) sample

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

We are trying to use simple time of arrival so using a 1PPS sync of a GPS should bee good enough. For this Mega Burst detector, much can be learned with out the need for VLBI type of resolution. This is sort of like the LIGO gravity wave detector -- View this message in context:

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

They (likely) have hardware designed specifically for their task that is higher cost and quality. On Fri, Apr 1, 2016 at 10:35 AM, wrote: > The main thing is that these bursts are *weak* (< 1Jy typically), and > *short duration*. Detecting a CW weak source with smaller

Re: [Discuss-gnuradio] radio astronomy fast radio burst

Yes, entirely feasible if you kind of "fudge and pray" on the practical realities. Even 10,000Jy is a tiny signal when cast in the context of a small antenna (2-3dBi). But can the technical infrastructure be built with relatively-cheap SDR-based kit, and Gnu Radio? Absolutely. On 2016-04-01

Re: [Discuss-gnuradio] radio astronomy fast radio burst

Marcus, Thank you for your replies Yes, No way with a dipole at a signal flux of 30J In discussions with two of our faculty members I was told that the bursts can be 10,000 J and attempts to find an afterglow have not yielded certain results. it is not known if any big antenna was really

[Discuss-gnuradio] 1PPS Synchronization - File Meta Sink Data

Hi all, I'm doing a simple RF recording with a B200mini synchronized to an accurate GPS 1PPS. I'm attempting to determine which samples(most importantly the first one) fall on a 1PPS pulse. I'm using the File Meta Sink block in GRC to try and extract information from the recording. When I read

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

The main thing is that these bursts are *weak* (< 1Jy typically), and *short duration*. Detecting a CW weak source with smaller antennae is feasible, because you can use long integration times. You have no such option here, unless you're talking about hundreds or thousands of dipoles, all phase

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

There are 3 options that I can think of: 1) Use multiple SDRs at each location. 2) Run an optimization algorithm as a post processing step to figure out what the phase synchronization should be. 3) If there is a transmitting satellite near there in frequency, use that to determine what the

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

VLBI guys usually have a local H1 maser clock, they go through a complex synchronization ritual prior to the start of observations. H1 masers have short-term stability on the order of 1e-16. GPS synchronization would be a *starting point* for such things. On 2016-04-01 08:42, madengr wrote:

Re: [Discuss-gnuradio] gr-cdma

Ekko, you have asked EXACTLY the same questions on a thread on Nov 2015. I believe I have helped you resolve this. Please follow the same ideas. If you still have problems try to send us ALL the information that was asked of you back then. Achilleas == Message: 13 Date:

[Discuss-gnuradio] MIMO implementation in GNU

Can anyone please help me how to implement MIMO configuration. Do you have any previous work?___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio

Re: [Discuss-gnuradio] radio astronomy fast radio burst help requested

What would it take to get phase coherency, say at 1 GHz, on a global scale; short of running cables? I assume with a moderate priced GPSDO one can get 10E-12 stability, so that would be 0.01 Hz frequency stability at 1 GHz. Does that mean you can integrate for 10 seconds and stay within 0.1

Re: [Discuss-gnuradio] Packet Header Generator - how it works?

The manual page does, however, reference 2 examples of how to implement the header generator, and two examples on how to use it (tx_ofdm.grc and rx_ofdm.grc). Cheers, Martin On 03/31/2016 12:46 PM, Miguel Santos wrote: > No, it wasn't, as it doesn't say how to use "Formatter Object". > Thanks

[Discuss-gnuradio] BTW, feature request (Re: costas ambiguity and correlate-and-sync block in qpsk)

On Fri, 2016-04-01 at 09:18 -0400, Andy Walls wrote: > In the generated *.py script I added one line near the end: > > print tb.get_modulated_preamble_untrimmed() > > So you can so this: > > $ source /setup_env.sh > $ ./Rx_syncd.py | grep -v volk | sed -e 's/(//g' -e 's/)//g' >

[Discuss-gnuradio] gr-cdma

hello all ,i am using the gr-cdma from https://github.com/anastas/gr-cdma and i followed the README, when i use the gnuradio-companion &, and open the cdma_tx_hier.grc i got some errors with the import Param - Import(import): Bad import syntax: "import cdma.cdma_parameters as cp". how to solve

Re: [Discuss-gnuradio] Switching from WX to QT

Use the search box, type in qt. The graphical sinks are in the [Instrumentation] category, the widgets in the [GUI widgets] category. Be a little investigative! On 01.04.2016 03:54, Ankit Saharia wrote: > I think i have installed an older package for QTGUI in windows. > For me it shows only

Re: [Discuss-gnuradio] diminishing returns with increasing frequency offset

N210 has a master clock of 100 MHz. Sample rates are drived by dividing that with an integer. It is preferrable to use dividers that are even (even better, divisible by 4) due to how the anti-aliasing filters in N210 digital down-converters are implemented. You get the flattest frequency response