On Fri, Jul 25, 2008 at 10:11:34AM -0700, Y. Zhuang wrote: > http://en.wikipedia.org/wiki/List_of_WLAN_channels > > Is it because the channel for 802.11 in 2.432G there, so the front end > was tuned to 2.432G? But there is 2.437G as well. > Or the font end is just picking the strongest channel it finds? Thanks > > Y
None of the above. I'm just decoding the details of how the usrp was tuned using a combination of the LO in the front end and the digital downconverter. The command line shows -f 2.437G. See the excellent USRP FAQ for additional info. http://gnuradio.org/trac/wiki/UsrpFAQ Eric > > 2008/7/25 Eric Blossom <[EMAIL PROTECTED]>: > > On Fri, Jul 25, 2008 at 07:46:58AM -0400, Greg Troxel wrote: > >> BTW, what does that guy mean "Not sure when you updated, but we have > >> changed > >> the checked in code to default to 2437, and run it like this (as a NetBSD > >> rc.d start script)", following the above link? > >> > >> details if you care, but surely they have little to do with your issues. > >> > >> http://www.netbsd.org/docs/guide/en/chap-rc.html > >> > >> about your output: > >> > >> ./bbn_80211b_rx.py -f 2.437G -v -b > >> Bits Per Encoded Sample = 8 > >> adc frequency = 64000000 > >> decimation frequency = 16 > >> input_rate = 4000000 > >> gain = 45.0 > >> desired freq = 2437000000.0 > >> baseband frequency 2432000000.0 > >> dxc frequency -5000000.0 > >> Samples per data bit = 8 > >> >>> gr_fir_ccf: using SSE > >> > >> 2.432G is used instead of 2.437G. Also the dxc frequency is negative. > >> And > >> no packets get printed out. > >> > >> I am unclear on dxc. > > > > That part is fine. dxc = digital down converter (DDC) or DUC depending on > > the context. > > In this case he wanted 2.437G. The front end was tuned to 2.432G, thus > > the DDC needed to be set to -5M to get the desired frequency translated > > to 0 Hz in the complex baseband. > > > > Eric > > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio