You have a plumbing problem. On 02/18/2017 08:29 AM, Robin A. Jensen wrote: > Hello all of you. > > I've just recieved my RTL-SDR dongle and is all new to this sdr-stuff, > so please bear over with me, if i'm at the wrong place. > I'm using GNU Radio Companion on a RPi 3 and no mather what i'll do, i > can't get the sound to work. > If a'im using rtl_fm and aplay, i'll get sound but it won't set on the > radiostation. I'll take on that later. > I've createt a small FM Reciever in GNU Radio companion and everytime > i'll execute the script i'll get an error: > > RuntimeError.audio.alsa.sink > > I've been all over the internet to find a solution but with no luck. > So now i'm have a hope that this mailling list can help me? > > My setup is: > RTL-SDR Source: samplerate: 2M, frequency 96.5 MHz -> > Rationel Sampler: Interpolation 4, Decimation: 1 ->
At this point, the sampling rate is 8 MHz. If the interpolation was 1 and decimation 4 then the sampling rate would be 500 kHz. > Low Pass Filter: Sample rate: 2M, Cutoff freq: 100K, Transition Width: > 100k -> No indication of any decimation in the low pass filter - assuming a decimation of 1 - or none. > WBFM Recive: Quadrature: 500K, Audio Decimation: 1 -> > Rationel Sampler: Interpolation: 500 > Decimation: 48 -> Assuming a decimation of 1 in your low pass filter, the audio sampling rate would now be 83 MHz. Again, you need to reverse things - decimate at 500 kHz and interpolate at 48 kHz. I'd recommend deleting the first rational sample and decimating by 4 in the low pass filter. In short, interpolation up samples and decimation down samples. > Audio Sink: Sample Rate: 48 KHz, Device Name: HW:0,0 > > I've found that recipie on a Hack5 video and there it's working > > With best regards > Robin. > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > . > _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
