Question

what is the difference between the radio program broadcast in past years from we listen now days

Answer 1

The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio.[1]Radio development began as "wireless telegraphy".[1] Later radio history increasingly involves matters of broadcasting.

Answer 2

In previous days after the invention of radio wave it was amplitude modulation,but now frequency modulation is used as fm has some more advantages over am e.g-in fm the amplitude remains the same and the modulation is done in frequency so noise can be eliminated in fm.                         Thanks