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ABSRACT
Broadcast radio transmission system is transmission system in the distribution of information using radio waves. Radio waves are electromagnetic waves that propagate in free space at the speed of the speed of light (300.000 km/det) . There are two types of modulation used in Lembaga Penyiaran publik Radio Republik Indonesia (LPP RRI) in Pekanbaru, namely the Frequency Modulation (FM) and amplitude modulation (AM). In FM modulation using a type of radio wave Very High Frequency (VHF) is between 88-108 MHz. In using this type of wave modulation AM Medium Frequency (MF) is between 500-1700 KHz. In the process the transmitted radio signal is only the sound (audio). At the base station signal produced by the microphone sound that serves as a transducer, which converts the energy of sound (audio) into electrical energy (sound signal) with a maximum frequency of 20 KHz (AF = audio frequency).
Keywords: Modulation, Radio, Frequency, audio, Transmission.
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