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 Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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