bodypack

A bodypack, also known as a beltpack or wireless bodypack transmitter, is a portable audio transmitter worn on the body and used in wireless audio systems. It is designed to capture sound from a microphone or instrument and send it to a receiving unit for amplification, recording, or broadcast. Bodypacks are common in film and television production, live theatre, and corporate events, where performers or presenters require mobility.

Most bodypacks include a belt clip, a battery compartment, an RF transmitter, and an input connector for a microphone or other audio source. Inputs are typically 3.5 mm TRS, TA4F, or XLR-compatible, depending on the system. Power is usually provided by disposable AA batteries or a rechargeable lithium-ion cell, offering several hours of operation. Some models include features such as an inline mute switch, input level control, a limiter, and RF power control.

Operation involves pairing the bodypack with a compatible wireless receiver, which is connected to a mixer, camera, or recording device. The signal path is microphone or instrument to bodypack, transmitted over radio frequency, then decoded by the receiver. Systems are available in various frequency bands and may allow multiple channels to operate simultaneously without interference. Regulatory requirements for use, including licensing or coordination, vary by country and band.

Applications include usage with lavalier or headset microphones for performers, presenters, or reporters, as well as wireless instrument wireless packs. Maintenance focuses on battery health, connector integrity, and periodic frequency checks to prevent interference.