Local wireless audio signal RF transmitter and receiver

摘要

A local wireless system for transmitting a modulated RF carrier audio signal from a base unit to a receiver unit is provided. The base unit has a pair of audio input connections of which are coupled to an audio source amplification device for receiving left and right audio signals. The receiver unit has a pair of electroacoustic transducers (speakers) for reproducing demodulated left and right audio signals modulated upon the RF carrier audio signal. The base unit encloses a transmitting circuit having a first antenna and first, second and third circuits which modulate the left and right audio signals onto an RF carrier audio signal in the 900 MHz range. A receiver unit encloses a receiver circuit and is coupled to the pair of speakers. The receiver circuit performs a single downconversion of the modulated RF carrier audio signal from the 900 MHz range to a useable 10.7 MHz left and right signal.