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Re: [Discuss-gnuradio] Streaming Funcube Dongle Pro+ over UDP

From: Vanush Vaswani
Subject: Re: [Discuss-gnuradio] Streaming Funcube Dongle Pro+ over UDP
Date: Fri, 9 Aug 2013 02:52:52 +1000

So the receiver begins with a sample rate of 48 KHz? So how is it possible to FM demodulation this case?

On Fri, Aug 9, 2013 at 2:09 AM, Iain Young, G7III <address@hidden> wrote:
Different parts of the flow graph can have different sample rates.

You need to use the rational resampler so it's output matches what
your soundcard expects.

You may also need a complex to real somewhere. There are plenty of
examples for a FM receiver on the web.

Best Regards


On 08/08/13 16:56, Vanush Vaswani wrote:
How can I set the sampling rate on both ends to be the same? FCDPP
sampling rate is 192 KHz.

If I include an audio sink, is the rate of the flowgraph controlled by
the sound card sampling rate?

Attached are my .grc files.

On Thu, Aug 8, 2013 at 11:34 PM, Alexey Bazhin <address@hidden
<mailto:address@hidden>> wrote:

    Do you set sampling rate 192000 on both ends? Post your grc files.

    On Thu, 8 Aug 2013 14:09:42 +1000
    Vanush Vaswani <address@hidden <mailto:address@hidden>> wrote:

     > Hi there,
     > I'm trying to stream the FCDPP over UDP to a another computer
     > The setup is as follows
     > FCDPP Source -> UDP Sink
     > For the receiver,
     > UDP Source -> LPF -> Quadrature demod -> FM Deemph -> LPF -> Audio
     > sink
     > Unfortunately, when I run the flowgraph on the receiver end, I only
     > hear a bunch of clicks.
     > The console is full of messages "WARN: Too much data; dropping
     > packet.". WX GUI FFT Sink and Waterfall seem to work, though with the
     > same messages.
     > Any hints to rectify this issue?

    Alexey Bazhin <address@hidden <mailto:address@hidden>>

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