Ich bin kein Funkamateur.
But actually I'm catching the air stuff
with my Realtek RTL2832U
dongle (using the dvb_usb_rtl28xxu
driver).
...
Since my (integrated) sound card supports up to 384 KHz, I just connected the "Microphone IN"
with some antenna I've prepared for it.
Using Audacity I can record/receive smth.,
just like the DCF-77 signal.
;-)
My Raspberry Pi also got his GPIO where I've already tried to (de-)modulate my own information with it. It rumored it supports up to ~500 MHz..
TODOJFYI: In the WWW there are also 'real' SDR streams available, which some nerds receive (via antenna!) & to make them public in the web this way. :-)
(physikalisches rauschen ... via SDR);
The following things were also inspired by the really old (for CRTs, ~1990s?) Tempest for Eliza..
deep-tempest gr-tempest tempest-lcdAnd see my Downloads section.
That's another keyword which is kinda related... indirectly.
Just Google it,
or look at the following link.