Hi Chris, On 01/14/2015 06:44 PM, Chris Hallinan wrote: > Greetings, I'm a first time user of gnuradio. Welcome! > I've prototyped an FM receiver as described in the tutorial at the > bottom of this page: > http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorial_Hardware_Considerations > > However, when I run it, and set the center frequency to a close-by FM > station, although I can hear actual broadcast audio snippets, meaning > that it's actually receiving a coherent signal, it is very choppy, > with audio snippets being played in a very choppy, almost rhythmic > fashion. The console window on gnuradio-companion shows a continuous > series of aUaUaU, etc. > > I'm guessing this might be an underrun situation somewhere, but that > is speculation. But speculation that's probably correct :) aU is audio underrun, which means you're most probably supplying samples at a rate that's lower than the audio sink is configured to accept. > I'm using parameters provided by the tutorial including a sample rate > 250K. I've tried moving the sample rate around, but without much > improvement. Dropping it down significantly destroys all hints of > intelligence in the signal ;) Am I overtaxing the capabilities of > this rtl-sdr dongle? Probably not, since you're doing so well this far! Basically, use a sampling rate that works, and decimate to exactly the sampling rate you need for your audio sink.
> > I have a reasonable (and growing) understand of the core concepts, but > could use some help on the learning curve. > > Any advice appreciated. > see above :) Greetings, and happy hacking, Marcus _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
