Re: [Discuss-gnuradio] FSK receiver

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.bell4@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 <hoangnt09@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

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 -HoangNT-
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 -HoangNT-
PhoneNo :  +841654248782

Skype : hoangastro

FB : https://www.facebook.com/kenshin.rorouni