Re: [Discuss-gnuradio] GNU Radio flow graph for Spectrum sensing

[Marcus Müller]

Hi Rodrigo,
 both is right, due to Parseval's Theorem stating that energy of a signal in time and frequency domain is equivalent.

Regarding "File is large": of course it is; I don't know what sampling rate you're using, but assume you have 1MS/s of complex float, that will be
2*32bit*10^6/s = 8MB/s of data.

Regarding "it cannot be opened": Opened by what? Maybe you're not aware of:
http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#What-is-the-file-format-of-a-gr_file_sink-How-can-I-read-files-produced-by-a-file-sink

Greetings,
Marcus

On 13.08.2014 23:29, Rodrigo Rozário wrote:

Hi Martin,

I am generating by the following flowgraph:

RTL2832 source -> FFT -> File Sink

I tried too:

RTL2832 -> File Sink

Is it right?




2014-08-13 9:00 GMT-03:00 Martin Braun <address@hidden>:

How are you generating those files?


On 08/12/2014 01:30 AM, Rodrigo Rozário wrote:

Hi guys,

I'm trying to configure a spectrum analyzer with GNU Radio and I had a
many problems. I tried a lot of ways to do it but all of them failed.

More specifically, I need to get information about the FFT and store it.

I tried the following:
- I get data from the block RTL2832 and store it: this is generates a
very big file data end a can't open. In a file of a few seconds of
storage (50Mb) I can't recognize the power values.

- I try to store and after open it on a editor, but not work.

I think that there is any problem in the format of the data stored. Can
you help? Anyone already can do it?


--
/*Rodrigo Rozário */
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/Universidade de Brasília - //University of Brasília/
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