Shure UA845UWB Antenna Distribution System

General Description

The Shure UA845UWB antenna distribution system allows up to four receivers to use a single set of antennas. It also provides power connections for the receivers. The system compensates for insertion loss when splitting RF signals to multiple outputs by amplifying the signal, providing a strong signal to the receivers. Cascade connectors allow for a fifth receiver or a second UA845UWB to be connected. Front panel buttons allow switching between five different frequency bands (174-1805 MHz).

System Features

The Shure UA845UWB model offers the widest frequency band coverage, ensuring maximum sensitivity and signal processing capability for receivers operating in various frequency bands.

• Selectable Frequency Bands: The UA845UWB supports five selectable frequency bands, providing an option to prevent intermodulation distortion.
• RF Power Overload LED: A red LED on the front panel indicates an RF power overload condition.
• Expandability: The UA845UWB is designed for large wireless systems. Each unit can connect two identical antennas to up to four receivers. The CASCADE port allows for a fifth receiver or a second UA845UWB to be connected.
• Compatibility: The UA845UWB is compatible with all Shure wireless receivers operating within compatible frequency bands.
• Cascade Port: The 50 ohm, BNC antenna cascade port allows connection of additional UA845UWB units or a fifth wireless receiver. This enables the use of a large wireless system with a single pair of antennas.
• Power Output and Output Connectors: Multiple receivers can be daisy-chained and powered from a single source via the power output connectors.
• Low Noise and Intermodulation Distortion: The UA845UWB minimizes distortion, ensuring a clean signal.
• Insertion Loss Compensation: When signals are split to multiple output ports, signal strength is reduced. The UA845UWB amplifies the signal to compensate for this loss, delivering a strong signal to the receivers.
• Front-Mount Antennas: The UA845UWB includes hardware for front-mounting antennas if needed.

System Components

• UA845UWB Antenna/Power Distribution System
• (4) Locking DC Power Cables (for ULXD4)
• (4) Non-Locking DC Power Cables (for QLXD4, SLX4, BLX4R)
• (10) 22-inch BNC Cables
• (2) 6-foot BNC Cables
• (2) Front-Mount Antenna Bulkhead Adapters
• (1) AC Daisy-Chain Cable
• (1) AC Power Cable
• Rack-Mount Hardware

Note: UA845UWB/LC models do not include these items. UA845UWB/LC models include (2) 22-inch BNC cables instead.

Front and Rear Panels

Front Panel:

• ① Front-Mount Antenna Mount: For mounting antennas on the front panel.
• ② RF Power Overload Indicator: Two red LEDs indicate RF overload for Antenna A and B.
• ③ Frequency Band Selector: Button to select the operating frequency band.
• ④ Power Switch: Turns the unit on or off.

Rear Panel:

• ⑤ AC Power Input Connector: Connect the AC power adapter here.
• ⑥ AC Power Output Connector: Provides power output for daisy-chaining up to five Shure diversity single or dual receivers.
• ⑦ Antenna Input Ports (Channels A & B): BNC connectors for antenna input.
• ⑧ RF Cascade Connectors (Channels A & B): BNC connectors for connecting a fifth receiver or an additional UA845UWB.
• ⑨ RF Output Connectors (Channels A & B): BNC connectors for connecting up to four wireless receivers.
• ⑩ 15 V DC Connectors: Four connectors for DC power output.

Rack Mounting Instructions

• Ensure adequate airflow in the rack, especially in closed or multi-device racks, to keep ambient temperatures below the manufacturer's specified maximum (Tma).
• Avoid unevenly loading the rack to prevent hazardous conditions.
• Consider the impact of power supply circuits, including overcurrent protection and wiring, when connecting equipment to the supply circuit.
• Maintain proper grounding for rack-mounted equipment. Exercise caution when bypassing supply connections with power strips.

System Installation

Front-Mount Antenna Installation

The UA845UWB can be equipped with front-mounted antennas. This improves RF performance by allowing antennas to be positioned at the front of the rack. For rack-mounted systems, antennas must be mounted externally or on the front panel.

1. Insert the bulkhead adapter into the bracket holes and secure it with the provided hardware.
2. Connect the antenna cables to the receiver antenna inputs and the adapter.
3. Install the antennas onto the bulkhead adapter protruding from the front panel.

For optimal performance, position antennas 45° apart, angled upwards. This maximizes reception and minimizes dropouts. Always perform on-site testing of the system in your area before using wireless systems.

External Antenna Installation

External antennas can be placed closer to the transmitter, offering better reception. They can be installed anywhere within the recommended cable length range, providing a wider reception range and reducing the likelihood of dropouts. For information on inline RF amplifiers, contact Shure.

• When using long cables, use Shure low-loss cables suitable for the operating frequency. Use Shure inline RF amplifiers if necessary.
• Position antennas at least 3 m (10 ft) away from the transmitter.

Connecting Receivers

Single Antenna Distribution Setup

1. Connect the UA845UWB's RF Output ports (Channels 1-4, A & B) to the antenna input ports of each receiver using Shure low-loss 50Ω coaxial cables. Use the CASCADE ports to connect a fifth receiver.
2. Connect the UA845UWB to a power outlet using the provided power cable.
3. Daisy-chain receivers using the power output cables. Connect the UA845UWB power output connector to the power input connector of one receiver, and repeat for the remaining receivers. Connect the unit's power input to the AC power source.

Note: A single UA845UWB can power a maximum of five Shure receivers via daisy-chaining.

Multiple Antenna Distribution Setup

Connect the UA845UWB's RF Output ports (Channels A & B) to the antenna input ports of a receiver or a second UA845UWB using the CASCADE ports.

Connect additional units in the same manner if necessary.

To daisy-chain receivers for power, connect the UA845UWB power output connector to the power input connector of one receiver, and repeat for the remaining receivers. Connect the unit's power input to the AC power source.

Warning: To add more UA845UWB units to the system, each UA845UWB must be connected to a separate power supply. While one UA845UWB can power up to five receivers, daisy-chaining multiple UA845UWB units through the power output ports can overload the power supply and damage the equipment.

Frequency Band Selection

1. Press and hold the SET button until the green frequency band LED starts blinking.
2. Cycle through the five available frequency band options by clicking the SET button.
3. The blinking LED will stop, and the selected band will illuminate.

RF Power Overload

A red LED on the antenna overload indicator signifies that the antenna amplifier is overloaded by a strong RF signal. To resolve this, increase the distance between the antenna and the transmitter, or reduce the antenna gain setting.

Warning: Overloading the antenna amplifier can reduce the number of channels and degrade system performance.

Accessory Selection Guide

Note: Select antennas and accessories compatible with your wireless system's operating frequency range. Contact Shure or your local dealer for assistance in selecting appropriate wireless accessories.

Antenna Cable Selection

Use low-loss 50 ohm coaxial cables, such as RG-8U. Shure offers pre-terminated antenna cables ranging from 6 to 100 feet.

Note: For frequencies above 1000 MHz, select Shure low-loss "Z" models for longer cables.

DC Bias Voltage Enable or Disable

Devices manufactured after August 10, 2018, allow disabling the DC bias voltage on the UA845UWB.

Note: The manufacturing date is printed on the bottom of the unit.

To Disable DC Bias Voltage:

1. Turn on the unit while pressing the SET button.
2. Release the SET button when all front panel LEDs illuminate.
3. Power cycle the unit.
4. If all green LEDs blink briefly and then the LED corresponding to the selected frequency range remains lit, the DC bias voltage is disabled.

To Enable DC Bias Voltage:

1. Turn on the unit while pressing the SET button.
2. Release the SET button when two red LEDs illuminate.
3. Power cycle the unit.
4. If the frequency band LEDs illuminate and remain lit after a power cycle, the DC bias voltage is enabled.

Specifications

Frequency Band Range

Output Level (Gain)

• 0 dB, typical
• Receiver Antenna Input, Output Ports 1-4: -2 dB to +2 dB
• Receiver Antenna Input, Cascade Output: -1 dB to +1 dB

Output Connector Isolation

• >25 dB, typical

3rd Order Overload Intercept Point (OIP3)

• 24 dBm, typical

Input - Output AC Line Voltage, Switching

• 100 - 240 V AC, 50/60 Hz

DC Output

• 15 V DC, 4 connectors

Output Current

• 2.5 A, maximum

Impedance

• 50 Ω

Operating Temperature Range

• -18°C (0°F) to 63°C (145°F)

Dimensions

• 44.5 x 482.6 x 295.3 mm (H x W x D) (1.75 x 19 x 11.6 in.)

Net Weight

• 3.32 kg (7.3 lbs)

Connector Type

• BNC

Power Consumption (AC)

• Typical when no antennas are connected or receivers are connected to DC output: 14.1 W per unit

Certifications

A "CE Declaration of Conformity" is available from Shure Inc. or its European representative. Contact information can be found at www.shure.com.

The CE Declaration of Conformity can be found at: www.shure.com/europe/compliance

Authorized European Representative:

Shure Europe GmbH
European, Middle Eastern and African Headquarters
Department: EMEA Approval
Jakob-Dieffenbacher-Str. 12
75031 Eppingen, Germany
Phone: +49-7262-92 49 0
Fax: +49-7262-92 49 11 4
Email: info@shure.de

This product meets the essential requirements of all applicable European directives and is eligible for CE marking.

Important Product Information

Licensing Information

License: In certain regions, government licensing may be required to operate this equipment. Inquire with the relevant authority for applicable requirements. Any changes or modifications not expressly approved by Shure Incorporated could void the user's authority to operate the equipment. Licensing for Shure wireless microphone equipment is the responsibility of the user, and licensing eligibility depends on the user's classification and application, and on the frequency selected. Shure strongly urges the user to contact the appropriate licensing authority to determine which licenses are required prior to choosing and ordering frequencies.

Note: This radio equipment is intended for professional entertainment and similar applications. This wireless device may operate on some frequencies not yet authorized in your region. Please contact the appropriate authority for information on authorized frequencies and RF output levels for wireless microphone products.