# Recording simultaneously multiple FM station with Gnuradio

**URL:** <https://www.ruby-forum.com/t/recording-simultaneously-multiple-fm-station-with-gnuradio/224233>\
**Category:** GNU Radio\
**Created:** [November 4, 2012, 4:00pm UTC](https://www.ruby-forum.com/t/recording-simultaneously-multiple-fm-station-with-gnuradio/224233 "2012-11-04T16:00:02Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [November 4, 2012, 4:00pm UTC](https://www.ruby-forum.com/t/recording-simultaneously-multiple-fm-station-with-gnuradio/224233/1 "2012-11-04T16:00:02Z")

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Hello,

I am newbie in this forum. I would like to know if it is possible to  
record simultaneously many FM stations with single SDR tuners or many  
SDR  
tuners. Can the ezcap USB 2.0 DVB-T/DAB/FM dongle can be used for this  
end.  
If yes how many channels, it can record simultaneously.Any suggestion is  
welcome.Thanks.

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**Author:** ![Olivier\_Austina](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/o/f6c823/32.png) [@Olivier\_Austina](https://www.ruby-forum.com/u/Olivier_Austina)\
**Post date:** [November 4, 2012, 4:12pm UTC](https://www.ruby-forum.com/t/recording-simultaneously-multiple-fm-station-with-gnuradio/224233/2 "2012-11-04T16:12:18Z")

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On 11/04/2012 09:59 AM, Olivier Austina wrote:

> Austina

Well, the practical bandwidth limitation on the RTL is 2.4Msps.

At 200kHz channel spacing that’s 12 stations.

Your limitation will be whether you have enough CPU cycles to demodulate  
all of those at once. The Dongle doesn’t “know” anything about  
demodulation, and Gnu Radio places no limit on how many demodulators  
you can be running in parallel, but from a practical perspective,  
you’ll be limited by CPU and memory bandwidth.

–  
Marcus L.  
Principal Investigator  
Shirleys Bay Radio Astronomy Consortium

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