[Hackrf-dev] Decode the Signal

[Mike Walters]

The signal in the first and second videos is Wi-Fi - if you use a sample
rate of 20M you can see it much clearer.

On 14 October 2015 at 07:28, Srinivasan T <tsvs.lc at gmail.com> wrote:

>
>
> Dear All,
>
>
>
> I am managed to do some RND with unknown Signal at 2.4 GHz. This Signal
> works almost everywhere in Singapore, Indonesia and Malaysia.
>
> Here some video for reference :
>
>
>
> *Here is the video :*
>
>
>
> Ø  *FFT at 2.4 GHz ( we can see sudden fluctuation and power in db is
> really high - in Singapore at home ) *
>
> *      https://sendvid.com/33f5hpkg <https://sendvid.com/33f5hpkg>*
>
> *        Detail : On this video, we can see peak hold in green color that
> leave a trace something comes and go*
>
>
>
> Ø  *Spectrum Density of RF at 2.4 GHz ( in Medan - Indonesia )*
>
> *        http://sendvid.com/mu9m2jeg <http://sendvid.com/mu9m2jeg>*
>
> *        Details : I have taken this video at place where there was no
> devices that operate at 2.4 GHz ( near plantations ). We can see noise
> floor in blue color comes and go.*
>
> *                         This external interference cause Wi-Fi at 2.4
> GHz to fluctuate and sudden fluctuate at different power level will
> increase of SNR of Wi-Fi ( signal to noise ratio )*
>
>
>
> Ø  *AirMagnet XT ( in Singapore at home )*
>
> *      Attached video file, file name ;   https://sendvid.com/tkq3xz0s
> <https://sendvid.com/tkq3xz0s>*
>
> *      Details :    This software one of the best software available in
> the market for detection interference Wi-Fi at 2.4 GHz with different
> options. We can see FFT picture at real *
>
> *                        time in leave suddenly max hold around -10 dBm. (
> We can spectrogram picture as well ).  There are 2 rules to be remembered :*
>
> ·         *If power level increase suddenly to 10 dBm then the source
> should be near and visible to me but on this case we dont see the source*
>
> ·         *Any RF Transmitter at 2.4 GHz will transmit at constant power
> and sudden increase of power at middle of transmission really no possible.*
>
>
>
>       *Wi-Fi Fluctuations at Siloam Hospital in Medan - Indonesia*
>
> http://sendvid.com/2u2j34m7
>
>
>
> I would like to request on how decode header information or others of the
> signal. I have captured .iq and .cfile using HackRF :
>
> https://www.dropbox.com/s/wj77dm4n7fj7rcl/Signal%20Capture.7z?dl=0
>
>
>
>
>
> Please advise on  decode the signal.
>
>
>
> Regards
>
>
>
>
>
> Srinivasan T
>
>
>
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>
>
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