wireless system
A wireless system is a radio transmission system for wireless microphones and musical instruments, especially guitars. Such a system consists of a transmitter and receiver unit. The transmitter units can be integrated into the radio microphones, or in the case of guitar wireless systems, they can be pocket transmitters attached to the belt or guitar strap. There is a wired connection between the transmitter and the instrument sensor.
The transmitter can transmit the voice or radio signal on various frequencies in the UHF range or in the ISM band. Some are free of charge and registration, others are subject to a fee or are allocated. To avoid interference noise during transmission, transmission on the 25 kHz wide transmission channels is in frequency modulation. Transmission can be analog and digital and also encrypted.
Every single wireless microphone and every wireless guitar needs its own transmission channel for transmission. In order to exclude disturbed or impaired transmissions, wireless systems can choose between a few and several thousand transmission channels, depending on the equipment. Another technique used in wireless systems to improve transmission quality is diversity techniques, which improve the signal-to-noise ratio and reduce signal drop outs.
Receiving units are relatively sensitive at about 30 dBµV and have low distortion. Some are equipped with antenna diversity.