Hi Marcus,
Brilliant. I am in the middle of assembling my own radio telescope,
but had not thought Pulsar reception would be possible.
I have a couple of questions on the RF Hardware. I see from some other
updates, that the antenna is essentially sets of a 4 bay HDTV antenna.
How are you phasin
Hi Wolfgang,
You Wrote:
On 01/08/15 09:17, Wolfgang Nagele wrote:
Hi,
I've recently needed to correct some satellite signals for Doppler
shift. I found that there was no easy way to do this yet - so I've
Interesting. The way I did it was the following (using predict, rather
than gpredict):
On 06/03/15 19:19, Mike Markowski wrote:
A few weeks ago I started learning my way around gnuradio and am making
progress, but could use advice from experienced users.
I've been making something of an online lab notebook recording my
efforts in gnuradio at:
http://udel.edu/~mm/gr/
At the v
On 28/12/14 19:08, Mostafa Alizadeh wrote:
Again I think we need to remove fading channel before SNR estimation. Is it
true?
To answer this specific point (and Marcus is far more better versed than
I in this science):
More fading equals less signal, more noise at particular times, thus
wor
On 28/12/14 16:41, Marcus Müller wrote:
I have to stress this: SNR is *signal* to noise ratio. Signal is what your
application defines to be signal!
_THIS_
The Signal is what you want to hear. Whether that be a nice square wave
from MSF, DCF, WWV, or where ever at a nice 1bps, or 802.11 PSK,
Hi Tom,
On 10/11/14 19:39, You wrote:
No, right now, when the hier_block affinity value is set, it forces all
blocks within it to that value for the processor affinity. The individual
settings on blocks do not supersede this setting. Part of the reason is how
this stuff is managed inside of the
Hi Folks,
I am attempting to get some FEC working with my GRC OFDM Transmitter
and Receiver, which I created by modifying the example versions. You
can see the flowgraphs at:
http://hal.g7iii.net/GRC/OFDM/ofdm_rx_fcd.grc - GRC FCD RX Flowgraph
http://hal.g7iii.net/GRC/OFDM/ofdm_rx_fcd.grc.png -
Hi Folks,
A quick question on CPU affinity when using hier blocks. I can set the
affinity in each of the blocks that makes up the heir block, but I can
also set it once I instantiate my hier block in my main flowgraph.
Anyone know the behaviour in this case ? If I leave all the blocks
within the
I use predict, the xmlrpc server, and it bit of glue code for twiddling
the FIR filter's offset for my Funcube and NOAA receivers to account
for doppler.
Allows me to have tighter BPFs (well LPF's really), although does mean
I need to remember to update the TLE's from time to time!
Biggest probl
On 12/08/14 12:41, jmfriedt wrote:
I am completing a summary of this summer's experiments including
* decoding weather satellite and the opportunity to introduce
channelized decoding (Frequency Xlating FIR Filter)
I guess you mean the NOAA POES Fleet, transmitting APT on around
137MHz ? Or are
Hi Folks,
Sorry to be late with my two penneth, but I am still in catch up mode
from vacation.
On 13/06/14 03:52, Marcus D. Leech wrote:
On 06/12/2014 10:43 PM, Tom Rondeau wrote:
In one sense, this is a low priority because we are moving away from
using the wx sinks in favor of the qt sinks
Hi Folks,
I am continuing with developing my SDR radio clocks. TDF uses Phase
Modulation (Details Here[1] and Here [2]), and I'm coming up against
my limits of understanding, so am after some pointers or at least
confirmation that I'm doing it wrong or am on the right path from
those better ver
Hi Lou,
You Wrote:
On 15/05/14 23:28, madengr wrote:
Iain Young, G7III wrote
I lashed up a quick Goertzel filter at 250Hz, and re-tuned so I was
250Hz off from MSF. Hacked up some code to actually decode the
output of GRC to the timecode bits for MSF. It decodes perfectly,
even without
On 15/05/14 20:30, Marcus Leech wrote:
I worked on a WWVB receiver a few years back. Then realized that I'm in an
apparent "null" in the WWVB transmit pattern. Even
my commercial WWVB clocks cannot receive it. Sigh.
Ah, that's unfortunate, to say the least. And now they've gone and
comp
Hi Everyone,
In recent days I had the idea to plug my LF preamp and antenna into my
192k Soundcard. Even with Nyquist being his usual pain, that still gives
me DC to 96kHz. Perfect for certain time stations :)
I lashed up a linear receiver, put it on 59kHz, and what do I hear ?
"pip pip pip" fro
On 08/08/13 17:52, Vanush Vaswani wrote:
> So the receiver begins with a sample rate of 48 KHz? So how is it
> possible to FM demodulation this case?
No, that's my transmit chain (assuming you are referring to my
GUI_TRX_JACK flowgraph)
The (Simplified) FM RX chain in the same flowgraph goes th
On 09/08/13 00:22, Vanush Vaswani wrote:
Hi,
If i add a rational resampler to match the audio rate before the UDP
sink, I can get a continuous output, but it's of terrible quality due to
the loss of information.
You are always going to have to throw information away. You have 192k
that you are
On 08/08/13 21:14, Johnathan Corgan wrote:
On 08/08/2013 01:01 PM, Andrew Davis wrote:
It's not just you, I noticed this too. This change broke gr-atsc ( but I
fixed that ).
The problem is on line 80 of
gr-filter/lib/freq_xlating_fir_filter_XXX_impl.cc.t: the 2 was not
negative in 3.6 but is no
Different parts of the flow graph can have different sample rates.
You need to use the rational resampler so it's output matches what
your soundcard expects.
You may also need a complex to real somewhere. There are plenty of
examples for a FM receiver on the web.
Best Regards
Iain
On 08/08/1
On 22/07/13 12:31, M Dammer wrote:
Is it possible to link Gnuradio and Gpredict ? I want to use Gpredict as
tracker controlling the antenna position and to pass doppler corrected
frequency data to Gnuradio.
In a word, yes.
Can be very simple. I did it by using an XML Server in the flow graph,
Hi Tom,
I'm up for that. The Tuesday or Thursday are both good for me, just
let me know where and when, and I'll sort out how to get there (I
live approx 1 hour by train from London)
Iain
On 21/06/13 15:10, Tom Rondeau wrote:
Hi everyone,
I'll be in London the week of July 8 for a few lectur
On 16/05/13 22:56, Mark McCarron wrote:
Can't find this info anywhere, does anyone know the format for the
'labels' section of this control?
They are strings. Something like:
["LABEL-1","LABEL-B","LABEL-3"]
Iain
___
Discuss-gnuradio mailing list
D
Hi Folks,
I have been spent the last couple of days working on agnuradio
flowgraph to receive the MSF Time Signal here in the UK on 60kHz,
using it as a learning experience.
I'm hoping that I can eventually use similar code to receive DCF and
also RBU, and the compare the results from my hardwa
On 31/03/13 23:29, Alexandru Csete wrote:
On Thu, Mar 28, 2013 at 11:41 AM, Volker Schroer wrote:
Just for your information:
In imitation of the gr-fcd source I set up a gnuradio source for the funcube
pro+ ( linux only) . To avoid the crashes depending on libusb I used the
hidraw driver.
Th
Hi Volker,
You Wrote:
I tested against 3.6.4, gentoo 64 bit.
I'm not very familiar with cmake, so perhaps the cmake code may be
improved. Can you send me the error message ?
I think it was just my set of multiple/semi broken trees of various
3.6.x branches, precog etc that was confusing cmake
Hi Volker
You Wrote:
In imitation of the gr-fcd source I set up a gnuradio source for the
funcube pro+ ( linux only) . To avoid the crashes depending on libusb I
used the hidraw driver.
The source and an example can be found on
Great, thanks for this, what version of gnuradio is it based of
On 17/01/13 14:53, mle...@ripnet.com wrote:
The rPI CPU is so anemic, that running a GR stack on it doesn't make
much sense. Perhaps just a data-gathering part, connected to some
hardware, forwarding samples to somewhere else.
I tested that using a TCP/UDP source/sink for bigger iron to conne
On 20/12/12 17:52, Sajjad Safdar wrote:
I have build an PMR446 Receiver in GNU Radio Companion. I can detect the
channel and also demodulate it, but the quality of the receiver is not
that much good. I want to amplify my received signal, Anyone have
suggestion how to do it.
If I read your flow
Hi John,
You Wrote:
Looking for thoughts, feedback, and ideas. [and of course, bug reports]
I just very quickly installed gr-precog under gnuradio-3.6.2. Installed
fine, but when starting grc, I noticed the following:
It seems that after installation, quite a lot of the sinks and
sources are
On 03/10/12 18:57, Josh Blum wrote:
On 10/03/2012 10:21 AM, Iain Young, G7III wrote:
I found the tuntap block, and noticed that it had an input and output.
I was expecting my flowgraph to take the userspace end of the network
interface, with the other end being the network device.
I found
Hi Folks,
Finally getting around to playing with some of the stuff in gr-extras.
Having compiled 3.6.2, and the extras, I found the tuntap block, and
was hoping to use it to implement some RF Networking with the GMSK
modules.
I found the tuntap block, and noticed that it had an input and output
Hi Folks,
Following on from the posts over the last few days on compiling
GNURadio for the Raspberry Pi, and having just taken delivery of
mine, I thought I would give it a go.
Having installed Raspian, I managed to get UHD and GNURadio compiled
and installed. This took the better part of 24 hou
Hey Martin,
You Wrote:
Posted ESTCube-1 satellite receiver on CGRAN. The code should compile
and work on the 3.6.1 GNU Radio version. This includes standard AX.25
decoder block.
Thanks for that. Managed to get it installed and running. Should be
very useful - If I can ever work out what I nee
On Wed, May 02, 2012 at 11:06:35AM +0200, Luca Pascale wrote:
> Hi all,
>
> Can someone suggest me a power amplifier to use with usrp+wbx on the
> 434 MHz band ? (I need a small output power...from 2 to 5 W).
I had exactly the same need as you, although I did want a bit more power,
but couldn't f
On Tue, Feb 21, 2012 at 05:46:51PM -0800, Josh Blum wrote:
>
> On 02/21/2012 03:30 PM, Marcus D. Leech wrote:
> >
> > Yup, the precipitating characteristic appears to be that both TX and RX
> > facilities are in use on the same USRP1.
> >
> > I was able to reproduce here with a trivial flow-graph
On 21/02/12 23:04, Marcus D. Leech wrote:
Sure can. Graph is as follows:
[Null Source] ---> [UHD SINK]
[UHD Source] ---> [Null Sink]
Results are as follows:
Options Block/Generate Options set to QT-GUI : Runs Fine
Options Block/Generate Options set to WX-GUI : SEGV
Options Block/Generate Opt
On 21/02/12 22:20, Marcus D. Leech wrote:
Hmmm, I had a simultaneous send/receive app on USRP1 a few weeks ago
that SEGVed. I didn't have time to investigate.
But perhaps this is the same issue?
Could you reduce it to UHD+"stuff"+innocuous sink -- does that work?
Sure can. Graph is as follows
Hi Marcus,
Thanks for the pointers, You Wrote:
I'm willing to bet that your segfault comes from our friend OpenGL:
Try this before you start your application:
export "LIBGL_ALWAYS_INDIRECT=1"
Tried it, no improvement.
Also try updating to latest master for Gnu Radio and UHD. If you're on
Hi Folks,
I'm having some fun and games with gnuradio, a USRP1, and trying to
transmit and receive at the same time, using gnuradio-companion.
A Simple [UHD SOURCE] > [UHD SINK] works perfectly, but when I
start to try to do other things, I get a Segmentation Fault from
somewhere.
Even some
On 28/01/12 12:19, Alexandru Csete wrote:
I think you misunderstand. The jack audio block is intended to be a
backend, as are all other audio subsystems. They are all accessed via
one unified API, which is already available as python and GRC block
(audio sink/source). The application doesn't kno
Hi Martin,
You Wrote:
Example: you want to create a new module called 'mydsp' and add two
blocks 'mydsp_algorithm1_ff' and 'mydsp_algorithm2_cc'. The first one is
a sync block, the second a hier block. Also, you'd like bindings for
GRC. This is what it might look like:
I must confess I am no
Hi John et al,
First, my apologies for waking up this very old thread. Only the other
night I had one of those "lightbulb" moments, as I have been trying to
implement something similiar for a while myself.
On 07/09/11 12:58, John Ackermann N8UR wrote:
Tom Rondeau said the following on 09/0
Hi Guys,
I have a USRP1, with a two WBX boards installed. I'm trying to use the
UHD source to get a stream from both WBX boards at the same time in
grc.
Do I need two UHD sources in my flow graph ? Or is there a way to get
a single UHD Source to give me two outputs in the way I want ? Any one
kn
Hi Folks,
Finally got around to compiling the latest git version of gnuradio,
(well from August 4th), so I can try out my new FunCube dongle.
Got it all compiled and configured to my satisfaction. Was surprised
to see it try and start jackd when I fired up Alex's FCD sample
application.
I was ab
Hey John,
On 24/06/11 15:06, John Ackermann N8UR wrote:
> Marcus D. Leech said the following on 06/21/2011 07:54 PM:
>
>> I have an example, in GRC, attached.
>>
>> It uses an audio source, which is common to all three modulators, this
>> goes to a fractional interpolator to interpolate up to the
Rsending, since my original email seemed to have gone into the black
hole...
Original Message
Subject: Re: [Discuss-gnuradio] new feature work: qtgui support in grc
Date: Sat, 19 Mar 2011 19:32:57 +
From: Iain Young, G7III
To: Discuss-gnuradio@gnu.org
Hey Josh
On 02/03
Hey Josh
On 02/03/11 01:52, You wrote:
I have been working on supporting PyQt widgets and the qtgui sinks in
the Gnuradio Companion. Get the code on my wip/qtgui/grc branch on
jblum.git http://gnuradio.org/cgit/jblum.git/log/?h=wip/qtgui/grc
I finally got some time to take a look, but it look
Hey Josh,
First, Thanks for the reply. You Wrote:
On 23/01/11 19:46, Josh Blum wrote:
Predict Doppler
get_doppler
Misc
from predict get_doppler
it has to validate block.dtd, the... should be after...
I just tried that, no change unfortunately. Is that all I've m
Hi Guys,
I am trying to add my own block to GRC for Doppler correction. To be
honest, the code itself is a very simple python UDP Client that talks
to predict.
The code itself works fine, and talks to predict. So I decided to
create a block for GRC. This is the XML for the block:
Predict
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