Description
The Shure PA421B Antenna Combiner is a professional-grade RF management solution designed to streamline wireless in-ear monitoring systems. Engineered for use with Shure PSM personal monitor systems, it efficiently combines up to four transmitters into a single antenna, reducing rack clutter while optimizing RF performance.
Ideal for live sound, broadcast, and installed AV environments, the PA421B minimizes intermodulation distortion to maintain a clean and stable RF signal. Its wideband operation across 470–865 MHz ensures compatibility with a wide range of wireless setups. Integrated DC power distribution eliminates the need for separate power supplies, while LED indicators provide real-time monitoring of signal presence, overload conditions, and current draw.
With its improved thermal design and quiet operation, the PA421B is built for reliability in demanding environments, making it an essential component for scalable and professional wireless monitoring systems.
| Specification | Details |
|---|---|
| Product Type | Four-Channel Antenna Combiner |
| Frequency Range | 470 to 865 MHz |
| RF Input Connectors | BNC |
| RF Output Connector | BNC |
| Impedance | 50 Ohms |
| RF Gain | 0 dB (±2 dB) |
| RF Configuration | Active |
| Expansion Port | BNC, passive configuration |
| Expansion Port Insertion Loss | Less than 4 dB |
| RF Expansion Port Operating Range | Up to 33 dBm (2 W) |
| DC Output Voltage | 15 V DC |
| DC Output Current (Per Output) | Up to 660 mA |
| DC Output Power (Per Output) | 9.9 W |
| LED Indicators | Signal presence, overload, and current draw |
| LED Detection Threshold | 2.5 dBm (RF), 85 mA (DC) |
| LED Overload Threshold | Greater than 24 dBm (RF) |
| Power Requirements | 100 to 240 V AC, 50 to 60 Hz |
| Power Consumption | Maximum 98 W |
| Current Drain | 1.09 A at 100 V AC |
| Operating Temperature Range | -18°C to 63°C |
| System Compatibility | Shure PSM Personal Monitor Systems |
| Key Features | Combines up to four transmitters, reduces intermodulation, rack space optimization, DC power distribution, daisy-chain capability |
Payment & Security
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Return Policy (Short Summary)
We offer a 30-day return window for most unopened, factory-sealed items.
Returns must be authorized before shipping back and must include all original packaging and accessories. Opened or used items are not returnable unless defective.
Some products—such as custom orders, special-order items, audio gear, software, and LED video walls—are non-returnable. Non-defective returns may be subject to a 20–30% restocking fee, and customers are responsible for return shipping costs.
For damaged or incorrect items, please contact us immediately.
From Scope to Sign-Off
A structured delivery process designed to reduce risk and keep projects moving.
Plan
Discovery, site review, requirements gathering, and project alignment. We define scope, constraints, and success criteria before any design work begins.
- Discovery calls & stakeholder interviews
- On-site survey & infrastructure review
- Requirements & use-case documentation
- Project scope, timeline & milestone alignment
Engineer
System design, schematics, signal flow, BOM development, and documentation. Every project leaves this phase with a complete engineering package.
- AV system design & signal flow diagrams
- Equipment selection & BOM development
- Rack layout & control system design
- As-built documentation package
Deploy
Procurement, logistics, installation, programming, commissioning, and training. We own the delivery from first shipment to final handoff.
- Authorized procurement & logistics coordination
- Physical installation & cable management
- Control system programming & configuration
- Commissioning, testing & end-user training
Support
Monitoring, maintenance, lifecycle planning, and long-term service agreements. We stay engaged long after project close.
- 24/7 remote system monitoring
- Preventive & reactive maintenance
- Technology lifecycle & refresh planning
- Long-term service level agreements
A decade of delivery — trusted by 275+ clients across industries
