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A lot of signals on 800mhz

Posted: Sat Jun 25, 2016 10:17 am
by Richard9026
I was searching the sdr spectrum when i suddenly found like 60 signals , all of the same type (I'm in Romania)
They start on 796.480 mhz and end on 805.480 mhz , they have an bandwith of ~27khz and the distance between them is ~29khz
On signal identification wiki I don't find anything
The start of the signals
start.jpg
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The end of them
end.jpg
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An zoomed in signal
9114_589177004436807_568624372_n - Copy - Copy - Copy.jpg
one signal zommed in
9114_589177004436807_568624372_n - Copy - Copy - Copy.jpg (127.64 KiB) Viewed 11244 times
How 1 signal sounds (NFM) http://www.mediafire.com/download/3vgqm ... 1Hz_AF.wav
It is just interference ?

Re: A lot of signals on 800mhz

Posted: Wed Jun 29, 2016 3:32 am
by rtlsdrblog
Is there an official frequency spectrum database for your country that you can lookup? Usually countries will provide such a database and you can go and see what company owns that specific frequency allocation. The signal looks quite wideband, might be for HD TV, or mobile internet.

Re: A lot of signals on 800mhz

Posted: Thu Jun 30, 2016 11:47 am
by Richard9026
I found the database , and I see that this band is allocated for broadcasting
Point of interest
tnabf en.jpg
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Full database http://www.ancom.org.ro/en/uploads/link ... 011_en.pdf

Re: A lot of signals on 800mhz

Posted: Thu Jun 30, 2016 9:52 pm
by rtlsdrblog
Yep appears to be DVB-T http://www.sigidwiki.com/wiki/DVB-T. It's just that you can't see the full size of it with the RTL-SDR. Not sure why there are lines throughout it though, could be some sort of interference as well.

Re: A lot of signals on 800mhz

Posted: Mon Feb 03, 2020 9:19 am
by luckystrike
I think it's your laptop AC/DC power adapter.

Re: A lot of signals on 800mhz

Posted: Thu Feb 06, 2020 3:58 am
by hotpaw2
Looks like a wide OFDM modulated signal. DVB-T uses OFDM.