‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Tuesday, January 12, 2021 10:11 PM, coderman
‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Tuesday, January 12, 2021 9:30 PM, Karl gmkarl@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,