Shure PA421B Four-channel Antenna Combiner, 470-865 MHz

Optimize RF performance and reduce rack clutter in multi-system monitoring and surveillance setups with the Shure PA421B four-channel antenna combiner. Designed for professional audio and security environments, this Shure RF combiner consolidates up to four PSM transmitters onto a single antenna set, improving intermodulation behavior and maintaining reliable RF monitoring for live sound, broadcast, and surveillance systems. The PA421B operates across a wide 470–865 MHz band to support diverse frequency plans, supplies +15V bias on RF inputs to power active antennas, and offers LED indicators for quick visual confirmation of signal presence and overload. For larger deployments, the expansion port allows daisy-chaining of up to two combiners, simplifying rack layouts and reducing antenna cable runs. The unit’s improved fan and thermal design lower ambient noise while enhancing long-term reliability in demanding security and monitoring installations. Whether you’re equipping a theater, broadcast facility, or security operations center, the Shure PA421B delivers cleaner RF, simplified antenna management, and scalable deployment options—add it to your rack to streamline RF management and improve monitoring performance.

• Streamlines RF management for multi-system monitoring by combining up to four PSM transmitters into a single antenna set
• Wideband 470–865 MHz operation ensures compatibility across regions and reduces intermodulation for cleaner RF environments
• Scalable design lets you daisy-chain up to two combiners so you can expand systems without adding extra antennas or clutter
• Provides +15V bias on RF inputs to power active antennas and includes LED indicators for signal presence and overload
• Rack-friendly chassis with improved fan design reduces rack clutter and improves thermal efficiency and ambient noise for live, broadcast, and security setups