Shure PA421B Four-channel Antenna Combiner, 470-865 MHz
Shure PA421B Four-channel Antenna Combiner, 470-865 MHz is backordered and will ship as soon as it is back in stock.
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Shure PA421B Four-channel Antenna Combiner, 470-865 MHz
Product Overview
The Shure PA421B antenna combiner is a four-channel PSM antenna combiner built for commercial AV installations that run several Shure personal monitoring systems from a single transmit antenna. It merges the RF outputs of up to four PSM transmitters across the 470-865 MHz range, reducing intermodulation distortion and multipath dropouts. For integrators planning in-ear monitor RF distribution in fixed-install environments, this 470-865 MHz wireless monitor combiner simplifies antenna infrastructure and improves signal reliability. It directly replaces the legacy PA421A.
Product Description
The PA421B is an active broadband antenna combiner that streamlines simultaneous operation of many PSM systems at one venue. Instead of mounting a separate transmit antenna for every transmitter, the integrator routes up to four P3T, P9T, or P10T transmitters into the combiner and feeds a single shared antenna. This four-channel PSM antenna combiner consolidates RF in the rack and frees panel space in crowded equipment rooms. By combining outputs into one antenna feed, it lowers the antenna-to-antenna interference common to dense wireless deployments. The PA421B is compatible with Shure PSM 300, PSM 900, and PSM 1000 systems, making it a practical fit for venues standardizing on Shure monitoring. It is engineered for rack-mount integration alongside other commercial-grade wireless infrastructure. For higher channel counts, integrators can step up to the eight-channel Shure PA821B, or specify the higher-band PA421BX for 865-960 MHz operation.
Key Features
- Four-to-One RF Combining — Merges the outputs of up to four PSM transmitters into a single antenna feed to simplify wireless monitoring infrastructure.
- Wideband 470-865 MHz Coverage — Supports broadband operation across the 470-865 MHz range for flexible frequency coordination in commercial deployments.
- Reduced Interference — Lowers intermodulation distortion and multipath dropouts compared with running multiple independent transmit antennas.
- Active Broadband Design — The active circuit helps offset combining losses so transmit signal strength is maintained across all four channels.
- Broad Shure Compatibility — Works with P3T, P9T, and P10T transmitters across PSM 300, PSM 900, and PSM 1000 systems.
- Rack-Ready Integration — Designed for installation in commercial AV equipment racks alongside other wireless components.
- Direct PA421A Replacement — Serves as a drop-in upgrade for installations built around the discontinued PA421A.
Typical Applications
- House of worship
- Auditorium
- Broadcast studio
- Multi-purpose room
Technical Specifications
| Model | PA421B |
| Type | Active broadband PSM antenna combiner |
| Configuration | Four-to-one (up to four transmitters into one antenna) |
| RF Frequency Range | 470-865 MHz |
| Compatible Transmitters | P3T, P9T, P10T |
| Compatible Systems | PSM 300, PSM 900, PSM 1000 |
| Replaces | PA421A |
Frequently Asked Questions
Which Shure systems work with the PA421B?
It is compatible with PSM 300, PSM 900, and PSM 1000 systems using P3T, P9T, or P10T transmitters operating in the 470-865 MHz range.
How many transmitters can the PA421B combine?
Up to four PSM transmitters are combined into one antenna feed, reducing the number of transmit antennas required in the install.
How do I scale beyond four channels?
For larger systems, the eight-channel PA821B handles up to eight transmitters on a single antenna, allowing you to standardize combiner hardware as channel counts grow.
What if my transmitters operate above 865 MHz?
Specify the PA421BX, which covers the 865-960 MHz band for regions and deployments using higher frequencies.
How does it integrate into an AV rack?
The PA421B is built for rack-mount installation and connects between your PSM transmitters and a shared transmit antenna using standard coaxial antenna cabling.
Is support available for integration?
The PA421B is covered by Shure's standard manufacturer warranty, and Creation Networks can assist with specification and integration into commercial AV systems.
At Creartion Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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