[Q] Playback I/Q recorderd using rtl_sdr

[Mohammad Bahathir Hashim]

Hi,
What is the proper option to record I/Q using rtl_sdr, and can be replay in GQRX?

It seem the filename of the 'key', to make it useable/replayable in gqrx.

I tried

$ rtl_sdr -f 145.5M -s 1500000 -p 6 gqrx_20141119_084835_145500000_1500000_fc.raw

But, nothing happens.

Any clue/hint?

Thank you,
73,
9W2GNU

[Alexandru Csete]

Gqrx can only play raw files with float complex samples, whereas the
sample format of rtl_sdr is 8 bit integers (I presume)

Alex

[Alexandru Csete]

You can perhaps convert the file using sox from format S8 or U8 to
float. Don't know whether rtl_sdr uses signed or unsigned samples.

Alex

[Mohammad Bahathir Hashim]

Thank you for the explanations and hints.

73,
9W2GNU

[Mohammad Bahathir Hashim]

Good news. Based on your hint, I able to convert the rtl_sdr's file (u8) to gqrx readable file format (fc).


Example:

$  rtl_sdr -f 447.7625M -s 250000 -p 6 gqrx_20141119_084835_447762500_250000_u8.raw

$ sox -t raw -r 250000 -b 8 -c 1 -e unsigned-integer gqrx_20141119_084835_447762500_250000_u8.raw  -t raw -r 250000 -c 1 -e float gqrx_20141119_084835_447762500_250000_fc.raw

Thank you.

73,
9W2GNU

[Alexandru Csete]

Cool! Thanks for the update.

Alex

On Fri, Nov 21, 2014 at 4:51 AM, Mohammad Bahathir Hashim

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