Record whole bandwith spectrum and review later

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Record
Posts: 6
Joined: Wed Dec 30, 2020 12:38 am

Record whole bandwith spectrum and review later

Post by Record » Wed Dec 30, 2020 1:13 am

Usecase: Record whole spectrum for a given frequency like FM broadcast at 100 MHz. Then later take this record as input for SDRSharp or another SDR software and view the signal as you would have done when recording the data.

I've googled but with that keywords I only got results recording and then replaying the data for opening doors or so. But I don't want to transmit recorded data. Just view later.

alanzfq
Posts: 190
Joined: Thu Oct 04, 2018 11:18 am

Re: Record whole bandwith spectrum and review later

Post by alanzfq » Wed Dec 30, 2020 9:44 am

I thought most SDR software could record the IQ stream?
Then you use the same software to check later.
SDR Console and HDSDR do, I guess SDR# will also?
Alan

Record
Posts: 6
Joined: Wed Dec 30, 2020 12:38 am

Re: Record whole bandwith spectrum and review later

Post by Record » Wed Dec 30, 2020 10:26 am

I'd like to start recording mobile on a raspberry pi, so a command line application for recording would be great and then restream this like rtl_tcp does live streaming.

rtlsdrblog
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Re: Record whole bandwith spectrum and review later

Post by rtlsdrblog » Thu Dec 31, 2020 1:13 am

The rtl_sdr command line tool records IQ files. Convert to SDR# IQ format with https://github.com/Marcin648/iqToSharp

The converter is a few years old though, so hopefully it works.

Record
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Joined: Wed Dec 30, 2020 12:38 am

Re: Record whole bandwith spectrum and review later

Post by Record » Wed Jan 20, 2021 11:05 am

Thank you very much. This program works great!

hotpaw2
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Re: Record whole bandwith spectrum and review later

Post by hotpaw2 » Wed Jan 20, 2021 3:33 pm

The bandwidth of the broadcast FM band is 20 MHz, or 2.4 GB of data per minute, which requires more expensive SDR hardware (Lime PCI, et.al.), and a fast computer storage system.

An RTL-SDR can reliably transfer over USB 2 only about 2 MHz of spectrum, or only about 10% of the entire FM broadcast spectrum, or less than 1% of the entire RF spectrum up through VHF. Perhaps you could capture larger bandwidths with an array of multiple computers each with multiple RTL-SDRs.

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