Shure PA421b
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Essential Information About the PA421B Antenna Combiner
Essential Information About the PA421B Antenna Combiner
- Optimizes your PSM systems: active wideband antenna combiner with 4 inputs to reduce the number of transmission antennas and simplify rack wiring.
- Designed for scalability: includes a passive 2-input / 1-output combiner allowing you to cascade two combiners and further share the transmission antenna.
- Centralized power supply: 4 outputs of 12V DC to power PSM900 transmitters, with LED indicators for quick visual monitoring.
- Stage versatility: can also be used as a microphone receiver antenna combiner thanks to the 10 internal DIP switches (activation of active antenna power supply) to extend coverage areas on reception.
Manufacturer Information
Shure
https://www.shure.com
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Safety manager:
Algam SAS
Email: contact@algam.net
Address:
A wideband combiner designed for modern rack configurations
The PA421B is intended for installations where RF reliability and rack cleanliness are priorities: tours, TV studios, corporate events, houses of worship, or rental fleets. Its 1U 19-inch rack format facilitates integration into a technical drawer, while its RF bandwidth of 470 to 865 MHz allows it to adapt to many frequency configurations, especially when managing multiple transmitters or optimizing a frequency plan for the same event.
Who is it for and what are its uses?
If you use multiple ear monitoring transmitters (notably PSM systems) and want to reduce the number of transmission antennas, the PA421B offers a clean and efficient solution: fewer transmission points, less clutter, and simpler setup and teardown. It is also suitable for RF technicians who want to structure a coherent rack with distributed power and control indicators, while maintaining room for expansion via cascading.
Beyond ear monitoring, its use as a microphone receiver antenna combiner allows configurations where you need to expand reception coverage, particularly by using active antennas (power supply activatable via DIP switches). This is especially useful when the stage, backstage, or audience areas require more robust reception.
Technical specifications
| Category | ear monitoring accessory | Weight | 4.3 kg |
| Type | antenna combiner | Dimensions (mm) | 43 x 401 x 365 |
| Rack format | 1U 19 inches | Power outputs | 4, 12V DC, for PSM900 transmitters |
| Weight (kg) | 4.30 kg | PSM power supply | 15V DC - 660 mA max. |
| Active combiner | wideband, 4 inputs, for PSM transmitters | RF presence LEDs | 4 |
| Passive combiner | integrated, 2 inputs / 1 output, for cascading two antenna combiners | 12 V power indicator LEDs | 4 |
| RF bandwidth | 470 to 865 MHz | DIP switches | 10, internal, for powering active antennas |
| Max. permissible power | 24 dBm - 250 mW | BNC cables | 4 x 60 cm, 1 x 30 cm |
| Max. permissible power of the passive combiner | 33 dBm - 2 W | Power cables | 4, 12 V |
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Questions frequently asked
Is the Shure PA421B compatible with PSM900 transmitters?
Four 12 V DC power outputs are provided for PSM900 transmitters. The reported PSM power supply is 15 V DC at a maximum of 660 mA.
How many IEM transmitters can be connected to the combiner?
The active section has 4 inputs intended for PSM transmitters. Four 60 cm BNC cables and four power cables are included for rack wiring.
Can two PA421B combiners be cascaded?
An integrated passive combiner with 2 inputs and 1 output allows cascading two units. Its maximum allowable power is 33 dBm, or 2 W. This setup increases the number of channels while limiting the number of transmit antennas.
What frequency range does this antenna combiner cover?
The RF bandwidth spans from 470 to 865 MHz, with a maximum power rating of 24 dBm or 250 mW.
Can the PA421B power active antennas for wireless microphones?
Ten internal DIP switches enable powering active antennas when used with microphone receivers. The 1U 19-inch format facilitates integration in an RF rack.
