Re: [Discuss-gnuradio] Re : Info on 2.4 GHz

[Marcus Müller]

Hi Srinivasan,

On 11.02.2016 05:11, Srinivasan T wrote:

Hi Marcus,

 

Thannks.

Spectrum density , that I have taken was in the are that there were no transmission.

I have RF meter that to measure RF power , HackRF also detected unknown RF that covered by Wi-Fi.

Point is, how do you *know* there's been no transmission? Where you in an RF-tight room and switched off all your bluetooth devices, smart phones, wireless door bells, wireless thermometers, RC car controls, wireless door openers, remote controlled power outlet switches, wireless keyboards & mice, wireless headphones... just to name the 2.4GHz ISM-band devices that pop into my head right now.
There's not only WiFi in that band, really.

 

You can see while recording it. RF meter which I have also indicates the radio sound is really unique.

Another product, AirMagnet 2.4 GHz spectrum analyzer shows the same things.

 

Waterfall Pattern also dfferent. Many people not sure about 2.4 GHz.

in 84 pages document, I have checked all details .

What document? What details?
2.4GHz is, for almost everywhere of the world, an unlicensed band, and there's practically no real limits on how the signals transmitted in there look like.

Best regards,
Marcus