The game has a control for Select long/short-range radio that can be found and changed in Settings->Controls->Common and under there in the Communication section.

By default the control is not assigned and thus it needs to be assigned. Assigning the control to any free/available key and then testing it in-game reveals that seemingly nothing happens when pressing the assigned key.

Is the key not working currently or is there some specific use-case or prerequisites for when it will "only" work?
As an end-user and looking only from the control's display name (Select long/short-range radio), I would say that I should be able to quickly switch between the active radio (either short or long-range). Is this the case?

But there's also another question regarding this control and the question is that what is it for? It seems that currently the control doesn't work but if it did then how it is intended to be used? As the display name implies you use it to select between short/long-rage radio and then what? Do you then broadcast through the selected radio with Talk over radio (hold) control?