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Re: [Discuss-gnuradio] detect if certain channels are being used

From: on4bhm
Subject: Re: [Discuss-gnuradio] detect if certain channels are being used
Date: Wed, 5 Feb 2014 22:13:48 +0100 (CET)

Let me be more clear of what is my goal here:
We receive the 13cm ham band (2300Mhz - 2400 Mhz)
This is converted down (-900Mhz) to 1400 - 1500 Mhz) (L band)
This way normal satelite receivers can rx amateur television stations in 13cm 

We have 3 input frequencies in use: 2330 Mhz, 2360 Mhz and 2390Mhz
For each input there are 2 receivers: 1 analoge end 1 digital. (this makes 6 
these receivers are powered on 24/7. this consumes a lot of power +-120Watt

Are station has te become "green"

So thats why i was thinking of making a "detection" system. so that when a 
signal comes in (being it analoge tv or digital tv)
the pair of receivers can be switched on for a while... and the video signal 
can be recieved and relayed...

The detection may run at slow speeds... 2 or 3 times per second. to reduce 
processing power.

I'm a newbee with gnuradio... but eager to learn!


----- Oorspronkelijk bericht -----
Van: "Marcus Müller" <address@hidden>
Aan: address@hidden
Verzonden: Woensdag 5 februari 2014 21:58:54
Onderwerp: Re: [Discuss-gnuradio] detect if certain channels are being used

Hash: SHA1

Hi Guy,

100MHz bandwidth is not easy to process. In fact, you can only capture
it at once if you have one of the brand new USRP X3*0.
But let's assume you have that :) and let's assume you have the
processing power to handle that amount of data.

You have to realize that "signal, no matter what" at f1,f2,f3 is not
really a specification. A signal might be a spread-spectrum signal
that is far below interference from electronic devices etc., as well
as an extremly short impulse, caused by some electric flash or
whatever, it can be very little Energy in a very narrow channel or
very much energy spread over 10s of Mhz's...

So, what you do is usually bandpass your signalled filter, and have a
model for your desired signal and look out for things that match that.
Depending on your model, this can be easy or impossible...


On 05.02.2014 20:39, address@hidden wrote:
> Hi folks,
> I want to accomplish the following with my usrp: Receive from 1400
> Mhz till 1500 Mhz and detect if there is activity (=signal, no
> matter what) on 1430, 1430 and 1490 Mhz So i have to split the
> spectrum in 3 parts (= channels) and do a peak detection on each. 
> But how do i split the spectrum of my source?
> kind regards Guy
> _______________________________________________ Discuss-gnuradio
> mailing list address@hidden 
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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