Pederson were able to increase the frequency of Duddell 's oscillator to the radio range , and in 1902 patented the Poulsen arc radio transmitter , the first transmitter which could generate continuous waves .
However , Danish physicists Valdemar Poulsen and P.O.
Pederson were able to increase the frequency of Duddell 's oscillator to the radio range , and in 1902 patented the Valdemar Poulsen arc radio transmitter , the first transmitter which could generate continuous waves .
However , Danish physicists Valdemar Poulsen and P.O.