Proposed operating frequencies are around 2.4 GHz in digital modes.

Since 2000, several digital modes implemented by computer programs have replaced voice and Morse code communications in popularity.

I'm having my people here switch into digital mode.

One of these modes is JT65 which is a digital mode.

And if the analog transmission fails, the signal cannot be transferred back into digital mode.

Few mobile stations are equipped to communicate with Morse code or digital modes.

And if the phone supports more than one mode, it will try the digital mode(s) first, then switch to analog.

So, once it has been set up to run PSK31, a computer can be used to explore a variety of digital modes.

The Philips machine - still under development - will work in either the analog or digital mode.

Amateur radio operators were instrumental in developing and implementing these digital modes.