New GR Tutorials Posted

GNU Radio
1

Hi everyone,

I would like to invite you all to check out and beta test our new GNU
Radio
Tutorials:

http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials

This was a good community effort to put this together, and I know that I
can rely on this community to now go and take them apart!

Thanks especially to:

  • Ben H.
  • Martin B.
  • Marcus Mueller*
  • Ankit Kaushik
  • Alfredo M.*
  • A special thanks for helping out even with your GSoC projects going
    this
    summer.

Hope some of you find this useful!

Tom

2

I stumbled upon these a couple weeks ago; they look really good! If we
find
any needed corrections, do we post them to this thread?

Thanks,
Lou
KD4HSO

Tom R.-2 wrote

Hi everyone,

I would like to invite you all to check out and beta test our new GNU
Radio
Tutorials:

http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials

–
View this message in context:
http://gnuradio.4.n7.nabble.com/New-GR-Tutorials-Posted-tp49912p49915.html
Sent from the GnuRadio mailing list archive at Nabble.com.

3

Very nice, thanks for the heads-up.

Doc

Sent from my iPad

4

There’s no indications of who authored the material?

5

On Mon, Aug 11, 2014 at 7:10 PM, madengr [email protected] wrote:

I stumbled upon these a couple weeks ago; they look really good! If we
find
any needed corrections, do we post them to this thread?

Thanks,
Lou
KD4HSO

Well, you had to be clever and jump ahead of the rest of the class! I
moved
the page names and added a front page that’s linked below. On there
you’ll
see to send all feedback and bug reports to [email protected].

Tom

6

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)
  • since satellites are not often visible at my latitude, application
    to POCSAG which is easier to grab, and most significantly using the
    pipe output to another decoding program as shown on YouTube by A. Csete,
  • understanding the processing load of the firdes tap generating
    function and comparison of the generated FIR coefficients with those
    provided by GNU/Octave (firls function),
  • comparison of the sensitivity of the various DVB-T receivers (at the
    moment still quite qualitative – I should find a protocol to quantify
    this sensitivity in the lab – any advice would be welcome).

This is all on the receiver side, no transmission/signal generation
other than simulation using the noise source.

At the moment the draft is still in French (if any French speaking
audience wants to have a quick look: jmfriedt.free.fr/sdr2.pdf). This
is still ongoing work targeted to be completed by beginning of October,
by which time I’ll have translated it to English.

JM

7

On Tue, Aug 12, 2014 at 9:36 AM, Martin B. [email protected]
wrote:

On 12.08.2014 08:33, Vanush V. wrote:

There’s no indications of who authored the material?

Not in the tutorials themselves. See Tom’s OP for a list of authors.

M

Also, the wiki keeps a history of who’s edited what.

Tom

8

On 12.08.2014 08:33, Vanush V. wrote:

There’s no indications of who authored the material?

Not in the tutorials themselves. See Tom’s OP for a list of authors.

M

9

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 you up on 1691 MHz ?

I am also experimenting with decoding NOAA WX satellites at the moment.
Flowgraph (some of which borrowed from the afore-mentioned OZ9AEC) and
some raw and processed pictures are at Index of /POES
Filenames have the format:

SC_RAW_DDMMHHmm.jpg - Raw Files received off air. RF Front-end is
gnuradio
SC_MCIR_DDMMHHmm.jpg - MCIR Fake Colour Images
SC_NOIR_DDMMHHmm.jpg - Infrared Colour enhancement Images (Shows strong
rain storms rather well sometimes)

Where SC will be NOAA15, NOAA18, NOAA19 as appropriate, and DDMMHHmm
is the time/date of the pass, UTC.

I also have a modified flowgraph that resamples to 11025kHz, and sends
that to an alsa loopback device, to which wxtoimg is connected on the
other end.

That’s actually how most of the pictures are created. While the output
from gnuradio is fine (although I have not done a back-to-back
comparison yet),

If you feed wxtoimg a raw image from Alex’s/Mine flowgraph, it can’t
tell when the pass was, or which spacecraft, so can’t work out where to
draw the map. Most annoying that it doesn’t let you tell it where
the s/c was :slight_smile:

Next pass I downlink, I’ll remember to keep the poes.dat output file,
and run that back to back test…

Antenna system is a double turnstile at ~12 ft, no preamp, Funcube
Dongle Pro Plus, fed into Gnuradio. I must try the USRP and compare!

For those interested, some of the images are of the remnants of
Hurricane Bertha, after she had passed my location. Height of the
Antenna for those was only 7 ft, due to expected high winds (Antenna
is only mounted temporarily on a carbon fibre fishing pole!)

Iain