--------
Try this:
https://sdr.hu/
Pick a european receiver, most of them have antennas that
will do VLF, otherwise pick another.
Enter 162 KHz
Press the two arrows pointing towards each other, twice
Pick extension "iq_display"
Change from "density" to "points"
Click on "160"
See live phase modulation
Change frequency to 198 kHz
Change frequency to 77.5 kHz
...
Then, if you want to really play:
https://github.com/hcab14/kiwiclient
allows you to capture and save the raw IQ data.
If necessary read:
https://www.dspguide.com/
Now, stop talking and start coding :-)
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[email protected] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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