From: Ralph A. Schmid, dk5ras [mailto:address@hidden
Sent: Monday, April 15, 2013 11:33 AM
To: 'address@hidden'
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 :) Ralph. From: address@hidden [mailto:address@hidden] 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 :) Little bug I just noticed is that the frequencies stated on the FFT are out by about 10khz, fixes are underway!
Cheers,
Mike
On 14 April 2013 08:23, Ralph A. Schmid, dk5ras <address@hidden> wrote: Hi, Why 6.25 KHz increments? This will not fit the 8.33 KHz air band spacing very well :) 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. 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_sense_n_play_v2_grc.png
GUI in action -> http://scanoo.com/grc/spectrum_sense_n_play/20130413_scanoo.com_spectrum_sense_n_play_v2_gui.png
Direct link to the GRC file:
http://scanoo.com/grc/spectrum_sense_n_play/20130413_scanoo.com_spectrum_sense_n_play_v2.grc
Please give it a test run and have a play with it. All feedback is greatly appreciated!
Cheers,
Mike
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