FCC Finalizes Rules for Wireless Microphones in Designated Frequency Bands

FCC Finalizes Rules for Wireless Microphones

The Federal Communications Commission (FCC) has released final rules regarding the operation of wireless microphones in designated frequency bands, including the television broadcast bands, the 600 MHz guard band, and several additional bands ranging from 6875–6900 MHz to 7100–7125 MHz. This document sets forth technical standards for low-power auxiliary station (LPAS) devices, facilitating the operation of an innovative wireless microphone system known as the Wireless Multichannel Audio System (WMAS).

Key Components of the Rules

• Permitted Frequency Bands: Wireless microphones are authorized to operate in specified television bands and the 600 MHz duplex gap.
• Power Limits: The maximum effective isotropic radiated power (EIRP) for WMAS systems in television bands is set at 100 mW.
• Technical Specifications:
  • Bandwidth: A maximum of 6 MHz in TV bands.
  • Emission Masks: Compliance with ETSI EN 300 422-1 (2021) emission limits.
  • Spectral Efficiency: Systems must support at least three audio channels per MHz.

The FCC is also modernizing its LPAS standards to ensure alignment with the latest European Telecommunications Standards Institute (ETSI) guidelines, further enhancing device compliance. These updates mark the end of the transition period following the Incentive Auction, focusing on improved spectral efficiency and promoting more intensive spectrum use for wireless microphones.

Effective Date

These regulations will take effect on November 18, 2024. The relevant ETSI materials can be inspected at the FCC and the National Archives and Records Administration (NARA).

Additionally, the rules impose operational limitations for auxiliary broadcasting services, including emission limits and output power requirements, ensuring that operations occur outside the protected contours of co-channel television stations.

Reference

For more details, you can access the document here - https://www.govinfo.gov/content/pkg/FR-2024-10-18/pdf/2024-23959.pdf.