Re: [Discuss-gnuradio] FSK receiver

[Hoang Nguyen Tran]

Thank you Marcus.

On Thu, Sep 3, 2015 at 4:05 AM, Marcus Müller <address@hidden> wrote:

Hoang,

there's the frequency modulator block. I think this is what you're looking for.

Best regards,
Marcus

On 03.09.2015 07:03, Hoang Nguyen Tran wrote:

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 <address@hidden> 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 <address@hidden> 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 <address@hidden> 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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