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
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 :
>
>
>
> O
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
Des
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
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
-- ##
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 satel
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 it?
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
emula
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
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
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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
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
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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 antennae is
> feasible, b
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
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 point
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 the
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
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 phase
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:
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: Fr
Can anyone please help me how to implement MIMO configuration. Do you have any
previous work?___
Discuss-gnuradio mailing list
Discuss-gnuradio@gnu.org
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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 radia
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 fo
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' >
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
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 CheckB
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 w
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