>I always thought it requires a CRT screen, Probably you were right, in the past, because it has become much easier to do this with LCD screens as their resolu

>I always thought it requires a CRT screen, Probably you were right, in the past, because it has become much easier to do this with LCD screens as their resolution has increased into a range which demands fine control of higher-frequency digital data -- high enough (a function of the Nyquist frequency, I guess) to reproduce an analog radio signal with sufficient control to carry a recognizable audio signal