Audio - UDP vs recording - difference - root cause?

[Javier Roldán]

Hi all,

I am running OS Linux Mint 19.3 with Gqrx 2.9.

I am currently using and RTL-SDR with GQRX configured with Filter Wide and solf, Raw I/Q, AGC Off.

I am using Gqrx UDP and injecting it to GRC 3.8.0.0.

In parallel, I am also recording the Gqrx as .wav via the rec button.

(in this case it is simply noise)

If I replay the .wav in GRC (see wav.JPG), the spectrum I see differs to the one I get from UDP (see udp.JPG). This I did not expect. Am I doing sth wrong? Or if not, does anyone know the reason for this?

Best regards,

Javier (EA1HEO)

[Alexandru Csete]

Hi Javier,

The wav recording contains two channels. The UDP stream is only one channel.

Alex

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[Alexander Fasching]

You have to use the WAV source instead of the file source.
The file source is for raw recordings like the ones created by Gqrx's
IQ recorder.