Re: [Discuss-gnuradio] I couldn't observe 2.4G Wi-Fi signal and didn't know why

[Martin Braun (CEL)]

On Sun, Nov 10, 2013 at 11:53:41AM +0800, Howard He wrote:
> I use four antennas for test. Two are official VERT2400, others are 2.4G
> antennas. I use the given example "uhd_fft.grc" (a simple FFT block) hoping to
> observe frequency spectrum of Wi-Fi signal. No matter what antenna I set up
> (even without antenna) and what central frequency I tune,  the FFT window only
> shows something like noise around -50--60dB on whole spectrum (sample 
> rate=25M)
> which is unlike the 802.11 standard.
> 
> There is low possibility of bad hardware I guess. I doubt that there may be
> some problems with my test methods and hope for some advice.

Hi Howard,

have you made sure the wifi stations are actually transmitting? Do you
have a real spectrum analyzer which shows energy transmitted?
And are you on the correct centre frequency?

MB

-- 
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)

Dipl.-Ing. Martin Braun
Research Associate

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KIT -- University of the State of Baden-Württemberg and
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