Radio Deejay started in 1982. The logo is a faceless head wearing some early headphones. in the head theres a circular rectangle with the word "Radio" in small above and "Deejay" inside.
In 1994 the head got removed and replaced with two swooshes (one red and the other yellow). the word "Network" is also added bellow the circular rectangle.
In 2007 the wordmark rest the same but the words are separate, the wordmark is surrounded in a circle.