On Mon, May 25, 2015 at 8:00 AM, Andreas Diehm <[email protected]> wrote:
> Hello fellow HackRF-Devs, > > I'm a german student working on a project in which we try to read the Data > of a WiFi-Network using the HackRF and Gnu Radio Companion. > I have some questions about some peculiar things that have happend to me > while exercising the lessons on SDR by Michael Ossmann. > I did the Radio in GRC and it worked only once, all the other times it > gives me "UaUaUa" as an Error-Message, is this related to my Hardware or > related to some bugs on the HackRF and what is the meaning of "U" and "a"? > Ua in GNU radio language is basically "audio underrun". See http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#I-have-a-receiver-with-acoustic-output-and-keep-getting-aUaUaU-errors for more info. > > Another question is about the filters in GRC. While trying to set up a > filter for my (very basic and unfinished) flowgraph ( > http://abload.de/img/bsbphudi.png ) I was unable to figure out, what > value the "transition width" needs. Is there a way of calculating it, trial > and error unfortunatly turned out to be unsuccsessful. > Transition width is the frequency gap between your pass band edge and your stop band edge. If you look at any textbook on DSP you should see a good picture. Your favorite search engine might also turn up good results; it's a fairly widespread concept. > > My last question is, if there is already a flowgraph that decodes > Wifi-Data, and is it even possible with the HackRF, Gnu Radio Companion and > a consumer-class PC to do such a complicated action? > For a list of nice GNU Radio applications see http://cgran.org (disclaimer: I'm a co-author of that page). gr-ieee802-11 is there: http://cgran.org/pages/gr-ieee802-11.html > > Best regards, > > Andreas Diehm > > Cheers, -Nathan
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