FW: Spectrum Sense n Play v2

From: Ralph A. Schmid, dk5ras [mailto:[email protected]]
Sent: Monday, April 15, 2013 11:33 AM
To: ‘[email protected]
Subject: RE: [Discuss-gnuradio] Spectrum Sense n Play v2

Yesterday I took the version from your first mail here, and it took me
only
a few minutes do adapt it to USRP1 and the 2m ham band. I only made some
quick tests, looks very nice! So I will take your corrected version,
switch
it to FM and see of what use it may be :slight_smile:

Ralph.

From: [email protected] [mailto:[email protected]] On Behalf Of Mike
Jameson
Sent: Sunday, April 14, 2013 2:20 PM
To: Ralph A. Schmid, dk5ras
Subject: Re: [Discuss-gnuradio] Spectrum Sense n Play v2

Hi Ralph,

Good point! Thanks :slight_smile: Little bug I just noticed is that the frequencies
stated on the FFT are out by about 10khz, fixes are underway!

Cheers,

Mike


Mike J. M0MIK BSc MIET
Email: [email protected]
Web: http://scanoo.com

On 14 April 2013 08:23, Ralph A. Schmid, dk5ras [email protected]
wrote:

Hi,

Why 6.25 KHz increments? This will not fit the 8.33 KHz air band spacing
very well :slight_smile:

I will give it a try, guess it will be no problem to adapt the scheme to
other bands - thanks for publishing your work!

Ralph.

From: [email protected]lid
[mailto:discuss-gnuradio-bounces+ralph
mailto:discuss-gnuradio-bounces%2Bralph [email protected]] On Behalf
Of
Mike J.
Sent: Saturday, 13 April, 2013 15:23
To: gnuradio
Subject: [Discuss-gnuradio] Spectrum Sense n Play v2

Hi All,

I’ve just uploaded version 2 of my Spectrum Sense n Play GNU Radio
Companion
application, compatible with the current master branch of GNU Radio (git
commit: dd387a3708196f382f0c1e8041077bf94038ae98).

It is currently setup to simultaneously monitor 4,000 6.25Khz channels
between 118MHz to 136MHz and picks the strongest one to tune in to. For
those of you who have an Ettus USRP2, N200 or N210 this should work out
of
the box with the WBX daughterboard. For use with other devices e.g.
USRP1/RTL-SDR dongle you need to swap out the UHD source block and alter
the
uhd_sample_rate variable.

Features in this version:

  • Frequency block list -> Paste in center frequencies to block,
    seperated by
    a space e.g. “118575000 121500000 134175000”.
  • Hold -> Press to hold on frequency, press again to continue.
  • Skip -> Press to enable frequency skip mode, press again to continue.
    Use
    this when adding a new frequency to block.
  • Squelch -> Adjust so that transmissions are heard without listening to
    static.
  • AM Demodulation -> currently configured to receive VHF airband
    transmissions.
  • Config File -> Uses a config file to save the squelch level and
    blocked
    frequencies.

Here are the files:

http://scanoo.com/grc/spectrum_sense_n_play/

Some screenshots:

GRC flowgraph ->
http://scanoo.com/grc/spectrum_sense_n_play/20130413_scanoo.com_spectrum_sen
se_n_play_v2_grc.png
GUI in action ->
http://scanoo.com/grc/spectrum_sense_n_play/20130413_scanoo.com_spectrum_sen
se_n_play_v2_gui.png

Direct link to the GRC file:

http://scanoo.com/grc/spectrum_sense_n_play/20130413_scanoo.com_spectrum_sen
se_n_play_v2.grc

Please give it a test run and have a play with it. All feedback is
greatly
appreciated!

Cheers,

Mike