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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Radio 1 is a radio broadcaster of the NPO, mainly broadcasting news and sport. In 2005, the following broadcastings transmit by the means of Radio 1: NOS, NPS, AVRO, KRO, NCRV, BNN, TROS, EO, RVU, VARA, VPRO, IKON, MAX, and LLiNK. Radio is the transmission of signals by modulation of electromagnetic waves with frequencies below those of visible light. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of space. Information is carried by systematically changing (modulating) some property of the radiated waves, such as amplitude, frequency, phase, or pulse width. When radio waves pass an electrical conductor, the oscillating fields induce an alternating current in the conductor. This can be detected and transformed into sound or other signals that carry information.