Fw: Re: USSS Electronic Countermeasures Suburban

coderman coderman at protonmail.com
Tue Jan 12 16:02:16 PST 2021


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, January 12, 2021 10:11 PM, coderman <coderman at protonmail.com> wrote:

>
>
> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Tuesday, January 12, 2021 9:30 PM, Karl gmkarl at gmail.com wrote:
>
> > i am interested in actually doing this but i'd need somebody to help
> > with the a couple of the parts i'm struggling with. any interest?
> > parts:
> >
> > -   software that performs a wideband sweep (there are existing tools
> >     that do this, one would be selected)
> >
>
> lots of options, both closed and open source.
>
> on the open source side, i've successfully used gnuradio in python and gnu radio companion GUI to implement selected modulation, processing, and output.
>
> for example, using the QT GUI Eye Sink https://wiki.gnuradio.org/index.php/QT_GUI_Eye_Sink
>
> > [i would like to record raw i/q
> > logs.
>
> here's your problem with that: bandwidth to storage media! :)
>
> depending on the hardware, you could be receiving signals at giga-samples per second.
>
> i've found the sweet spot is to do some signal processing to band filter, clean up, demodulate, and then persist that much reduced sample.
>
> note that this still consumes significant CPU, unless you're able to offload some signal processing on your receiver via FPGA (or something).
>
> > -   hardware to do the wideband sweep
>
> on the cheap end, an RTL-SDR would work fine!
> https://wiki.gnuradio.org/index.php/Hardware#rtl-sdr_TV_tuners
>
> on the expensive end, you've got the latest ettus and pervices hardware:
> https://pervices.com/documentation-cyan/
> https://www.ettus.com/all-products/usrp-n321/
>
> > -   access to the event with the setup
>
> this is where something smaller and lighter (RTL-SDR + rpi) would be preferable to larger and heavier :P
>
> best regards,




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