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Shure UA84OA UA Antenna Distribution System

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Shure UA84OA UA Antenna Distribution System

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Description

The Shure Model UA840 is an amplified, UHF Antenna Distribution System designed to expand a wireless microphone system by splitting one pair of antennas to multiple receivers. It also amplifies RF signals to compensate for insertion loss due to splitting signal power to multiple output ports. Each UA840 allows up to four receivers to use the same antennas. A CASCADE port allows connections to a fifth receiver or a second UA840. Read more

Features

  • Expandability. The UA840 UHF Antenna Distribution System is designed for large UHF wireless systems.Each unit allows up to four wireless receivers to use the same two antennas, and the cascade ports allow connection for up to five (5) more UA840’s, for a total of up to 20 UHF wireless receivers.
  • Compatibility. The UA840 is compatible with all wireless microphone receivers operating within a compatible frequency range (see UHF Carrier Frequency Ranges in the specifications section).
  • CASCADE Ports. Two 50 W, BNC-type antenna CASCADE ports allow additional UA840 unit or a fifth wireless receiver. A large wireless system can use a single pair of antennas.
  • Power OUTPUT Port. Up to five (5) receivers can be daisy-chained via the Power OUTPUT ports to a single power source.
  • Low Noise and Intermodulation Distortion. The UA840 maintains clean signals with minimal distortion

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The Shure Model UA840 is an amplified, UHF Antenna Distribution System designed to expand a wireless microphone system by splitting one pair of antennas to multiple receivers. It also amplifies RF signals to compensate for insertion loss due to splitting signal power to multiple output ports. Each UA840 allows up to four receivers to use the same antennas. A CASCADE port allows connections to a fifth receiver or a second UA840. Read more

Features

  • Expandability. The UA840 UHF Antenna Distribution System is designed for large UHF wireless systems.Each unit allows up to four wireless receivers to use the same two antennas, and the cascade ports allow connection for up to five (5) more UA840’s, for a total of up to 20 UHF wireless receivers.
  • Compatibility. The UA840 is compatible with all wireless microphone receivers operating within a compatible frequency range (see UHF Carrier Frequency Ranges in the specifications section).
  • CASCADE Ports. Two 50 W, BNC-type antenna CASCADE ports allow additional UA840 unit or a fifth wireless receiver. A large wireless system can use a single pair of antennas.
  • Power OUTPUT Port. Up to five (5) receivers can be daisy-chained via the Power OUTPUT ports to a single power source.
  • Low Noise and Intermodulation Distortion. The UA840 maintains clean signals with minimal distortion

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About the Shure UA84OA UA Antenna Distribution System

The Shure UA84OA is a professional active antenna distribution system designed to enhance the performance and scalability of UHF wireless microphone and in-ear monitor systems. Its primary function is to take the signal from one or two high-quality remote antennas and distribute it to up to four wireless receivers, allowing all receivers to share the same optimal antenna placement. This eliminates the need for each receiver to have its own separate antenna, reducing cable clutter, minimizing multipath interference, and ensuring that all receivers benefit from the best possible RF signal capture. The system is active, meaning it includes built-in low-noise amplification to compensate for signal loss in the cables and splitter, ensuring a strong, clean signal is delivered to each receiver port.

The unit is typically rack-mountable and features front-panel indicators for power and RF signal strength. It requires an external DC power supply for operation. By using a centralized antenna distribution system like the UA84OA, wireless system operators can achieve greater consistency and reliability across multiple channels, which is critical in large-scale events, broadcast environments, and touring applications where many wireless systems operate simultaneously. It also simplifies setup and teardown, as antenna cables can be permanently routed to a central rack location. Proper use of antenna distribution is a cornerstone of professional RF management, helping to prevent intermodulation and dropout issues.

For audio engineers and wireless coordinators managing complex multi-channel wireless setups, the Shure UA84OA is an essential tool for optimizing system performance. It maximizes the efficiency of antenna placement, improves overall signal integrity, and supports the reliable operation of high-density wireless deployments. By ensuring that all receivers have access to a clean, amplified signal from optimally positioned antennas, this distribution system plays a vital role in maintaining clear, uninterrupted wireless audio transmission in the most demanding professional scenarios.

Key Features

  • Expandability. The UA840 UHF Antenna Distribution System is designed for large UHF wireless systems.Each unit allows up to four wireless receivers to use the same two antennas, and the cascade ports allow connection for up to five (5) more UA840’s, for a total of up to 20 UHF wireless receivers.
  • Compatibility. The UA840 is compatible with all wireless microphone receivers operating within a compatible frequency range (see UHF Carrier Frequency Ranges in the specifications section).
  • CASCADE Ports. Two 50 W, BNC-type antenna CASCADE ports allow additional UA840 unit or a fifth wireless receiver. A large wireless system can use a single pair of antennas.
  • Power OUTPUT Port. Up to five (5) receivers can be daisy-chained via the Power OUTPUT ports to a single power source.
  • Low Noise and Intermodulation Distortion. The UA840 maintains clean signals with minimal distortion

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Shure UA84OA UA Antenna Distribution System Specs

System Function
Type
Active Antenna Distribution System
Function
Distributes antenna signal to multiple receivers
Capacity and Ports
Antenna Inputs
2 (for diversity antennas)
Receiver Outputs
4 (per antenna input)
Configuration
1x4 or 2x4 diversity distribution
Electrical Characteristics
Power Requirement
External DC Power Supply
Amplification
Active, Low-noise
Physical and Indicators
Mounting
Rackmount (typically 1U)
Indicators
Power, RF Signal
Application and Use
Compatibility
Shure & other UHF wireless systems
Primary Use
Large-scale wireless system optimization

Key Features

  • Expandability. The UA840 UHF Antenna Distribution System is designed for large UHF wireless systems.Each unit allows up to four wireless receivers to use the same two antennas, and the cascade ports allow connection for up to five (5) more UA840’s, for a total of up to 20 UHF wireless receivers.
  • Compatibility. The UA840 is compatible with all wireless microphone receivers operating within a compatible frequency range (see UHF Carrier Frequency Ranges in the specifications section).
  • CASCADE Ports. Two 50 W, BNC-type antenna CASCADE ports allow additional UA840 unit or a fifth wireless receiver. A large wireless system can use a single pair of antennas.
  • Power OUTPUT Port. Up to five (5) receivers can be daisy-chained via the Power OUTPUT ports to a single power source.
  • Low Noise and Intermodulation Distortion. The UA840 maintains clean signals with minimal distortion

Already own this item and want to sell it?

Click here to sell your item

FAQs about Shure UA84OA UA Antenna Distribution System

What is the Shure UA840A UA?

The Shure UA840A UA is a 4-way active UHF antenna and power distribution system designed for wireless microphone receivers. It allows up to four diversity receivers to share a single pair of antennas while also distributing DC power to eliminate multiple wall-wart power supplies.

What frequency band does the "UA" version cover?

The "UA" designation covers the 782 MHz to 806 MHz frequency band (former US TV channels 66–69). Please note that in the United States and several other countries, operating wireless audio equipment in the 700 MHz band is restricted or prohibited under current spectrum regulations.

How many receivers can a single UA840A support?

A single unit distributes RF signals to four diversity receivers via eight BNC output ports (four for Antenna A and four for Antenna B). It also provides four 12 Vdc output jacks to power all four connected receivers directly from the distribution unit.

Can multiple UA840A units be cascaded?

Yes, it includes two dedicated cascade ports (one for Channel A and one for Channel B). This allows you to link a second antenna distribution unit to expand the system to support up to eight receivers from a single antenna pair without needing external splitters.

Are the antenna inputs active or passive?

The unit features active, low-noise RF amplifier circuitry that compensates for internal signal division loss. This ensures that each connected receiver gets unity gain (0 dB net loss) compared to connecting an antenna directly.

Does the UA840A supply bias power for remote antennas?

Yes, the two main BNC antenna inputs provide switchable 12 Vdc bias power (up to 100 mA each). This allows direct connection to active directional antennas (like the UA870) or in-line RF boosters (like the UA830) through the coaxial cables.

How is the distribution unit itself powered?

The UA840A connects directly to AC mains power (120 Vac or 230 Vac, depending on regional model) via an integrated internal power supply and standard IEC cable. It eliminates the clutter of separate external DC power bricks in your rack.

Can the antennas be mounted to the front of the unit?

Yes, the front panel of the chassis includes pre-punched D-holes for mounting bulkhead BNC connectors. Using short BNC jumper cables, you can route the antenna inputs to the front rack ears for convenient front-facing antenna placement.

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