I just want to do a demo about two radios in one USRP by time divition, both are FM&FH, but with the intention to distingrish these radios,the FM deviation and FH hop step should be different.Now I could control the hop step,but the FM deviation can't be controled(FM deviation should be12.5K and 25K,which input to max_dev in WBFM module)
2009/10/26 Josh Blum <j...@joshknows.com> > > > nansai hu wrote: > >> I appracite you could tell me what is the meaning of following paramaters: >> @param audio_rate: sample rate of audio stream, >= 16k >> @type audio_rate: integer >> @param quad_rate: sample rate of output stream >> @type quad_rate: integer >> > > This is the input and output rates of the block. > > > @param tau: preemphasis time constant (default 75e-6) >> @type tau: float >> @param max_dev: maximum deviation in Hz (default 75e3) >> @type max_dev: float >> >> > No idea, check the source, but the default values are good to get a working > wbfm radio. > > > I try to change the max_dev from 10 to 1000,and give it to a usrp source as >> baseband signal, >> > > For transmit, the usrp expects numbers between +/- 2**15. Your transmit > amplitude should be on the order of 10k. What are you sending it? > > -Josh > > > > but, the bandwith on spectrum analyize don not change.How to change >> deviation of a fm signal? >> >> 2009/10/26 nansai hu <hunan...@gmail.com> >> >> I tried to run your code wfm, but there is nothing happened in my spectrum >>> analyzer. >>> I am just wondering that your code is in baseband or how to add a carrier >>> freq by usrp source. >>> >>> 2009/10/24 Josh Blum <j...@joshknows.com> >>> >>> >>> nansai hu wrote: >>>> >>>> Is anybody had a experiment about How to generate a FM signal? >>>>> >>>>> Use the wideband and/or narrowband fm blocks; just specify your data >>>>> >>>> rates. >>>> >>>> >>>> >>>> http://gnuradio.org/cgit/gnuradio.git/tree/gnuradio-core/src/python/gnuradio/blks2impl >>>> >>>> >>>> or tell me how to use FM MOD or VCO module in GRC, what is the paramater >>>> >>>>> sensitive means? >>>>> >>>>> check the source :-) >>>> >>>> -Josh >>>> >>>> >>> >>
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