Hi Rich, I am continue with the transmitting part ? However, I cannot fine the FSK modulate block or Quadrature mod in GNU radio companion. Is there another block that use for FSK modulation in GNU radio ? I found DPSK mod, GFSK mod, GMSK mod ... however not FSK. Do you have any example for transmitting flow graph in GNU radio with USRP ? If yes, could you please give any hint ? Thank you and best regard Hoang
On Mon, Aug 31, 2015 at 7:31 PM, Hoang Nguyen Tran <hoangn...@gmail.com> wrote: > Thank you Rich, > I have added Rational Resample with the formular : Fs_out = Fs_in x > Interpolation / Decimation > Then the grc run without error. > > > On Fri, Aug 28, 2015 at 7:03 PM, Richard Bell <richard.be...@gmail.com> > wrote: > >> 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 >>> >>> >> > > > -- > -HoangNT- > PhoneNo : +841654248782 > Skype : hoangastro > FB : https://www.facebook.com/kenshin.rorouni > -- -HoangNT- PhoneNo : +841654248782 Skype : hoangastro FB : https://www.facebook.com/kenshin.rorouni
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