Re: [Discuss-gnuradio] Noob question 1

[Marcus Müller]

Hi Henk,

the problem is that the RTL dongle (and any SDR peripheral) just gives
you the signal as it is in the air -- you will still have to demodulate
it to get audio!
Now, wild assumption: you want to listen to FM Radio for a start.
So:
* configure your audio sink to 44100 Hz sample rate
* use a WBFM receiver block with a quadrature rate of N*44100, and N as
decimation, feed the output (orange!) into the audio sink
* add a fractional resampler between source and WBFM receiver to match
N*44100 to a sampling rate the Dongle supports


Best regards,
Marcus

On 07.09.2015 10:03, 12henk12 wrote:
> Hello all
> 4 weeks ago did my first steps into Linux Ubuntu.
> I am trying to get the RTL-Dongel to work but still not succeded in that,
> Time to ask some help.
> There is a image with pre-installed drivers and GNU-Radio companion,
> http://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioLiveDVD
> I have downloaded that and put it on a USB stick. Works fine.
>
> In the terminal I enter rtl_sdr -t and the RTL-dongel is found and it works.
> Then I start GNUradio companion, it is version 3.7.7.1. The RTL is found in
> the sources.
> But the radio has a blue output and the audio-sink a orange one. In the
> Help-doks it says that this is because of the datatype
> but I cant change that anywhere. The dongel properties-block gives "complex
> float 32".
>
> Can you help me getting it to work? Only with a working system I can go
> further learning.
>
> Thanks
>
> Henk
> www.sterrenwachtleeuwarden.nl 
>
>
>
> --
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