[Jonah Vark]

If the internet is shut down, would short wave radio be good way to communicate necessary information?

Just curious.

[mylife]

Yes. And people use digital signals on shortwave all the time.

http://wn.com/RTTY_Demo

This is not internet. This is via radio.

[dragnet2]

If the internet is shut down, would short wave radio be good way to communicate necessary information?

Absolutely.