John,
I use the BE FLL for auto-doppler correction in the rare case where I am
not actively correcting for doppler. But, the correction is *really*
slow. I'm probably not using it correctly, but it works OK in that rare
case when it's all I've got.
Very Respectfully,
Dan CaJacob
On Fri, Oct 1
So i if would like to create a simple flow graph, with USRP source and file
sink only, is there any way to control file buffer size (i.e i want that any
file consist of 3k 32complex samples every write)?
Any 3.7 compatibile pipe pack? tried gr-pipe but typical "gnuradio-core"
error :(
--
View t
On 10/17/2014 12:40 PM, Ernest Szczepaniak wrote:
> So i if would like to create a simple flow graph, with USRP source and file
> sink only, is there any way to control file buffer size (i.e i want that any
> file consist of 3k 32complex samples every write)?
You can't control how many samples the
On 10/17/2014 08:28 AM, John Malsbury wrote:
> Also also, is the Band-Edge FLL ideal for GMSK? My possibly, incorrect
> understanding of that block is that it was more ideal for PAM with
> common RRC.
For the record: It might work coincidentally because of the rolloff-y
shape of GMSK, but it's de
​Hello,
I want to transmit and receive at the same time with WBX board and USRPN200.
I have this flowgraph.
I connected the input and output with a RF cable (a loop).
Is it possible? Is there any problem?
Thank you.
___
Discuss-gnuradio mailing list
D
Make sure you put an attenuator before going back into the N200 so that you do
not damage the RF input.
Ruben
From: discuss-gnuradio-bounces+ruben.merz=swisscom@gnu.org
[mailto:discuss-gnuradio-bounces+ruben.merz=swisscom@gnu.org] On Behalf Of
Carlos Alberto Ruiz Naranjo
Sent: Friday, O
Thanks for looking into it! To be honest, I am not really good at RF. I
based my code off the python code in gr-smartnet. The fsk-demod python file
is here:
https://github.com/bistromath/gr-smartnet/blob/master/src/python/fsk_demod.py
It is quite possible that it just happened to work because of a
It doesn't have frequency correction - I can probably follow up with some
ideas on how to implement that part. But the GMSK demod might do OK for
you initially. It doesn't do anything intelligent to deal with the data
shaping - its just a non-coherent slicer.
If you want to design in GRC but kee
Also, my understanding for the PLL blocks were that they were ideal for
"strong carrier" signals like AM. When I say strong carrier i mean a
signal that has an obvious carrier which isn't "hidden" under modulation..
Anyway, the GMSK block might be a good place to start.
-John
On Fri, Oct 17, 20
Ernest - here's an example of how to connect other stuff to GNU Radio via
pipes - granted at much lower sample rates. Higher sample rates shouldn't
effect the pipe, but Matlab may not keep up with a typical 802.11 sample
rate.
http://youtu.be/GBmli8Vflig?t=2m33s
If you *could* get this 3k sample
This sounds interesting - do you have any sample code?
Can anybody explain the concept of "size" of an fft (Arg 1 of fft . fft_vcc )
comes into play if the output of that FFT generates as many samples as it
receives?
- Original Message -
From: "John Malsbury"
To: "Brad Hein"
C
Again, if one uses the vector-probe block, one can call the appropriate
function from a function-probe, at that point, you have a variable with
the contents of the FFT output vector in it, which can be used in a call
to your
own Python code.
On 2014-10-17 12:01, Brad Hein wrote:
> This sou
I'm not sure what's wrong here, but it should be trying to install a
deb called python-qwt5-qt4, not pyqwt5. Perhaps run an apt-get update
and try again. The optimal solution is to find out if this is a bug in
pybombs or your setup and send a patch if it applies to others.
Otherwise you can get aro
So... there were actually several contributors to this long latency. Some
of it was related to GNU Radio's inner workings, some were external. With
all of the "external" things removed, there was still 1+ minute of latency
at low bitrates.
I thought I would share my findings, for the sake of ge
k1gto wrote
> Is there any way to access the fft bins from python without writing a
> custom block?
See this:
http://ha5kfu.sch.bme.hu/fft_test
Lou
KD4HSO
--
View this message in context:
http://gnuradio.4.n7.nabble.com/help-accessing-fft-bins-in-python-script-tp50854p50891.html
Sent from th
We see this issue a lot with applications that only transmit, and which
transmit continuously. The problem is that you end up generating samples
far in advance of when you really know what you want to transmit, because
there is no rate-limiting on the production side.
Some general principles -- L
Matt,
BTW - in this particular case, this was *all* in the receive direction -
its a lowrate demodulator. So I was a bit surprised to see the issue at
all - 'cause I've never seen such high latency on a receive flowgraph. We
have a "closed" loop approach to managing transmit latency through the
Yes, there were multiple issues in the thread, and what I said only applies
to TX. Certainly on the receive side there should be no latency issues, as
every block should do all computations they can on whatever data they
receive, since that is exactly what is tripping up the TX guys :)
Matt
On F
Hi,
I'm currently developing a testbed for spectrum aggregation and
fragmentation using GNURadio and USRPs (B200s and B210s). My approach is to
emulate aggregation and fragmentation using Non-Contiguous OFDM:
Theoretically, each node should be able to transmit in any subset of the
sub-carriers ava
You'll probably want to make a block to do the padding, or mux in zeros.
Matt
On Thu, Oct 16, 2014 at 3:00 PM, David Halls
wrote:
> Thanks Matt. is this likely to be the cause of the Us at the beginning?
> How can I pad simply in GNU radio? can i add padding to every burst? if so
> that seems
It actually looks like the control channel for Motorola SmartNet is FSK: "On
the control (data) channel the base station transmits 84 bits frames at
3600 bit/s with direct frequency modulation of the carrier using Frequency
Shift Keying (FSK). "
I will at least see if I can get something that look
The good news is. the GFSK block doesn't do anything specific to Gaussian
FSK. So I guess tha tall works out =)
You're outputs might be more illustrative if you rebuild it in from the
blocks actually inside the GFSK demod block:
quad demod > clock recovery -> slicer
On Fri, Oct 17, 2014 at 12:
Thanks for those tips.
Matlab can handle 20M samples due to receiver object, which is buffering
data, and than sending it to Matlab. My receiver is able to demodulate
around 5x802.11 frames per second but i want something more faster.
So i can use UHD driver in C++ enviroment directly right? Sorr
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:
http://whenisgood.net/pinanwe
Somewhere in the Oct. 27 - 31 date range will work best for me. Note that
you need to select your local timezone (e.g. I'll b
Hi Nathan,
I think the package is going to be installed isn't "python-qwt5-qt4". The
folder location of the package is going to be installed by pubombs is: "
/home/alizadeh/gnuradio_src/pybombs/src/pyqwt5". I tried to find an
installation help for this package and I found it (in the attachment).
T
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