Hi Hoang, Yes it's a problem with your design. You have 2 Msps feeding into an audio sink that probably goes up to 48 ksps. You need to change your sample rate from 2 Msps to a rate your sound card supports. I would target one of the default rates you can select from the audio sink. You can use polyphase arbitrary resampler block with the proper resampling ratio 2M/48k entered leaving the taps blank and the other parameters to default.
Hope that helps, Rich On Fri, Aug 28, 2015 at 2:19 PM, Hoang Nguyen Tran <hoangn...@gmail.com> wrote: > Dear all, > > I have just built a FSK receiver aim to receive Cubesat data with FSK > modulation with 9600 baud rate, below is my flow graph. > I have just tested it with usb dongle RTL-SDR, however when I'm using > audio sink, I received OOOOO (overrun I think) continuously . > Does it have anything wrong with my set up ? > > samplerate 2M > cut off freq 9600 > transition 4800 > > I really appriciate for any comment on my FSK receiver flowgraph, I am a > newbie :) > > Thank you and best regard, > Hoang > > -- > -HoangNT- > PhoneNo : +841654248782 > Skype : hoangastro > FB : https://www.facebook.com/kenshin.rorouni > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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