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Shure UA845 UHF Antenna Distribution System

$180.00

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Shure UA845 UHF Antenna Distribution System

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Description

The Shure UA845 is a UHF antenna distribution amplifier system designed to integrate with the Shure U4S, U4D, or UC4 wireless microphone receivers. The UA845 receives incoming RF signal using dual antennas, then distributes the signal via 4 BNC type connections. The UA845 also compensates for insertion loss by amplifying the signal on output. Each UA845 allows up to four receivers to use the same antennas. CASCADE connectors allows connections to a fifth receiver or a second UA845. There are also power connectors for powering Shure UHF and UC Wireless systems directly from the UA845. Read more

Features

  • Active Antenna Splitter - Five-way active antenna and power distribution for VHF and UHF frequency ranges.
  • Wide Frequency Range - Supports VHF, UHF, 1.2 GHz, 1.5 GHz, and 1.8 GHz bands.
  • Multi-Receiver Support - Connect up to four receivers to a single pair of antennas; cascade ports support a fifth receiver or an additional UA845UWB.
  • Internal RF Amplification - Built-in amplification compensates for signal loss caused by splitting the antenna signal.
  • CASCADE Ports - Dual BNC-type 50Ω CASCADE outputs for connecting additional receivers or another distribution unit.
  • Power Distribution - Provides power to multiple Shure UHF and UHF-R receivers via Power OUTPUT ports (excludes ULX and ULX-D).
  • Broad Compatibility - Compatible with Shure Axient Digital, UHF-R, ULX-D™, QLX-D, SLX, and BLX4R receivers.

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The Shure UA845 is a UHF antenna distribution amplifier system designed to integrate with the Shure U4S, U4D, or UC4 wireless microphone receivers. The UA845 receives incoming RF signal using dual antennas, then distributes the signal via 4 BNC type connections. The UA845 also compensates for insertion loss by amplifying the signal on output. Each UA845 allows up to four receivers to use the same antennas. CASCADE connectors allows connections to a fifth receiver or a second UA845. There are also power connectors for powering Shure UHF and UC Wireless systems directly from the UA845. Read more

Features

  • Active Antenna Splitter - Five-way active antenna and power distribution for VHF and UHF frequency ranges.
  • Wide Frequency Range - Supports VHF, UHF, 1.2 GHz, 1.5 GHz, and 1.8 GHz bands.
  • Multi-Receiver Support - Connect up to four receivers to a single pair of antennas; cascade ports support a fifth receiver or an additional UA845UWB.
  • Internal RF Amplification - Built-in amplification compensates for signal loss caused by splitting the antenna signal.
  • CASCADE Ports - Dual BNC-type 50Ω CASCADE outputs for connecting additional receivers or another distribution unit.
  • Power Distribution - Provides power to multiple Shure UHF and UHF-R receivers via Power OUTPUT ports (excludes ULX and ULX-D).
  • Broad Compatibility - Compatible with Shure Axient Digital, UHF-R, ULX-D™, QLX-D, SLX, and BLX4R receivers.

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About the Shure UA845 UHF Antenna Distribution System

The Shure UA845 is a professional active antenna distribution system designed to support large, multi-channel UHF wireless microphone systems by efficiently distributing clean RF signals from a central set of antennas to multiple wireless receivers. Its primary function is to eliminate the need for each receiver to have its own dedicated pair of long, cumbersome antenna cables and separate antennas, which can lead to signal degradation, phase issues, and a cluttered rack. The system takes the signal from two primary diversity antennas and uses internal, low-noise amplifiers to boost and split that signal, providing multiple sets of buffered, amplified outputs to feed banks of receivers. This centralized approach ensures all receivers receive a strong, consistent RF signal, maximizing system reliability and performance.

Engineered for critical touring and installed applications, the UA845 is housed in a single rack-unit metal chassis and is designed for high RF stability. It features front-panel gain controls for each antenna input, allowing technicians to optimize signal levels to prevent overloading or under-driving the connected receivers. The unit requires external DC power and includes status LEDs for power and signal presence. By using a single pair of well-positioned, high-quality antennas (like the Shure PA805 or UA874) with the UA845, sound engineers can achieve cleaner RF coordination, reduce cabling weight and complexity, and improve the overall noise floor and range of their wireless systems.

The Shure UA845 is an essential component for any professional audio company running eight or more channels of wireless microphones in a single location. It is standard in major concert tours, broadcast television, and large fixed installations where wireless reliability is paramount. By optimizing antenna signal distribution, it helps prevent intermodulation interference and dropouts, ensuring that every wireless channel performs at its best, even in the most challenging RF environments.

Key Features

  • Active Antenna Splitter - Five-way active antenna and power distribution for VHF and UHF frequency ranges.
  • Wide Frequency Range - Supports VHF, UHF, 1.2 GHz, 1.5 GHz, and 1.8 GHz bands.
  • Multi-Receiver Support - Connect up to four receivers to a single pair of antennas; cascade ports support a fifth receiver or an additional UA845UWB.
  • Internal RF Amplification - Built-in amplification compensates for signal loss caused by splitting the antenna signal.
  • CASCADE Ports - Dual BNC-type 50Ω CASCADE outputs for connecting additional receivers or another distribution unit.
  • Power Distribution - Provides power to multiple Shure UHF and UHF-R receivers via Power OUTPUT ports (excludes ULX and ULX-D).
  • Broad Compatibility - Compatible with Shure Axient Digital, UHF-R, ULX-D™, QLX-D, SLX, and BLX4R receivers.

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Shure UA845 UHF Antenna Distribution System Specs

General
Device Type
Active UHF Antenna Distribution System
Configuration
1x4 (One pair of antenna inputs, four pairs of amplified outputs)
RF Performance
Frequency Range
470 - 952 MHz (covers standard UHF bands)
Gain
Adjustable per antenna input (typically 0 to 20 dB)
Noise Figure
<5 dB typical
Impedance
50 ohms
Connectors
Antenna Inputs
2 x BNC (female)
Antenna Outputs
8 x BNC (female) (4 pairs for diversity receivers)
Power
DC input jack
Controls & Indicators
Controls
Individual gain controls for each antenna input
Indicators
Power LED, Signal Level LEDs per channel
Physical
Form Factor
1U Rack-mountable
Dimensions (W x H x D)
19" x 1.75" x 7.6"
Power Requirement
12-18 V DC

Key Features

  • Active Antenna Splitter - Five-way active antenna and power distribution for VHF and UHF frequency ranges.
  • Wide Frequency Range - Supports VHF, UHF, 1.2 GHz, 1.5 GHz, and 1.8 GHz bands.
  • Multi-Receiver Support - Connect up to four receivers to a single pair of antennas; cascade ports support a fifth receiver or an additional UA845UWB.
  • Internal RF Amplification - Built-in amplification compensates for signal loss caused by splitting the antenna signal.
  • CASCADE Ports - Dual BNC-type 50Ω CASCADE outputs for connecting additional receivers or another distribution unit.
  • Power Distribution - Provides power to multiple Shure UHF and UHF-R receivers via Power OUTPUT ports (excludes ULX and ULX-D).
  • Broad Compatibility - Compatible with Shure Axient Digital, UHF-R, ULX-D™, QLX-D, SLX, and BLX4R receivers.

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Click here to sell your item

FAQs about Shure UA845 UHF Antenna Distribution System

What does the Shure UA845 antenna distribution system do?

The UA845 splits incoming RF signals from a single pair of antennas across multiple wireless receivers, eliminating antenna clutter in equipment racks. It also provides DC power distribution to clean up power cabling for connected receivers.

How many wireless receivers can a single UA845 support?

A single unit directly feeds RF and power to up to four or five wireless receivers, depending on the specific model revision (such as the UA845UWB). It also features cascade output ports, allowing you to link an additional antenna distribution system to expand your channel count.

Does the UA845 provide DC bias power for active directional antennas?

Yes. The front- and rear-panel antenna input BNC connectors supply 12 V DC bias power, enabling direct operation of active directional antennas (like the UA874) and inline RF amplifiers (like the UA834) without external power injectors.

What frequency range does the UA845 support?

Standard vintage models were tuned to specific UHF frequency blocks (such as 470–530 MHz or 500–900 MHz), while modern versions like the UA845UWB (Ultra-Wideband) cover an expansive range from 470 MHz up to 960 MHz. Always confirm your unit's bandwidth matches the frequency bands of your wireless receivers.

Does the unit distribute DC power to connected receivers?

Yes, it includes internal power distribution that outputs DC power to connected Shure wireless receivers using daisy-chain power cables. This eliminates the need for individual external power wall-warts for each receiver in your rack.

What type of cables and connectors are required?

The system uses standard 50-ohm BNC connectors on all RF inputs, outputs, and cascade ports. You should always use low-loss 50-ohm coaxial cables (like RG-58 for short patch runs or RG-8X for longer runs) rather than 75-ohm video cables.

Is rack-mounting hardware included with the UA845?

Yes. The UA845 is built into a standard 1U half-rack or full-width metal chassis and includes front-panel rack ears, BNC bulkhead pass-through connectors, and mounting hardware for immediate rack installation.

Can the UA845 be used with other brands of wireless receivers?

Yes, its RF distribution works with any UHF wireless microphone receiver operating within the antenna distributor's specified frequency band using 50-ohm BNC inputs. However, the DC power distribution cables are tailored specifically for compatible Shure receiver power sockets.

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