The Shure Model UA845UWB Antenna Distribution System allows up to four receivers to use the same set of antennas. There are also power connectors for distributing power to each receiver. RF signal amplification compensates for insertion loss from splitting the antenna input to multiple outputs. Cascade connectors allow connections to a fifth receiver or a second UA845UWB. A button on the front panel switches between one of five frequency bands from 174 to 1805 MHz.
The Shure Model UA845UWB ensures maximum sensitivity and signal processing capability, providing the widest radio range possible for the largest number of wireless receivers.
*Not included with Model UA845UWB/LC variant
**Model UA845UWB/LC substitutes (2) 22 in. BNC cables.
Front Panel
Rear Panel
① Mounts for front-mounted antenna
② RF Power Overload Indicators
Displays RF overload with 2 red LEDs for antenna A and B.
③ Frequency Band Selector
④ Power Switch
⑤ AC Power Input Connector.
⑥ AC Power Output Connector.
Each amplifier has a power output connector for daisy-chaining up to five Shure Diversity Single or Dual Receivers to a single power source.
⑦ Antenna In Ports, Channel A and B.
BNC connectors for antennas.
⑧ RF Cascade Connectors Channel A and B.
BNC connectors for adding a fifth receiver, or an additional UA845UWB, permitting more wireless receivers to be connected.
⑨ RF Output Connectors, Channel A and B.
BNC connectors for up to four wireless receivers.
⑩ 15 V DC Connectors
Four connectors for DC power.
The UA845UWB comes equipped for front-mounted antennas. Front-mounting improves RF performance of the system by moving the antennas to the front of the rack. When a unit is located in a rack, antennas should be either front- or remote-mounted.
Note: For the best results, point the antennas up and away from each other at 45° angles from vertical. This ensures the best possible reception and greatly reduces the possibility of signal dropout. Always perform a walk-through test of the system in the performing area before using a wireless system.
Remote-mounted antennas have the advantage of being free from the unit and closer to the transmitters. They can be placed anywhere within the recommended cable length, creating a much wider radio reception range and further reducing the possibility of signal dropout. Please ask your Shure dealer for information on in-line RF amplifiers.
When remote mounting antennas, follow these guidelines:
Note: No more than five Shure receivers should be powered through a daisy-chain from a single UA845UWB.
Single UA845UWB Setup
Warning: When adding additional UA845UWBs to a system, each UA845UWB should be connected to a separate power supply. No more than five receivers can be powered from a single UA845UWB. Daisy-chaining multiple UA845UWB's through the power output ports will overload a single power supply, possibly causing damage to the equipment.
Multiple UA845UWB Setup
When the Overload Antenna Indicator displays a red LED, it indicates that a strong RF signal is overloading the antenna amplifier. To correct an overload condition, increase the distance between the antenna and transmitter, or lower the antenna gain setting.
Warning: Overloading the antenna amplifier results in reduced channel count and poor system performance.
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Note: Be sure to select antennas and accessories that are compatible with the operating frequency range of your wireless system. Contact Shure or your local retailer for help with selecting the right wireless accessories.
Use 50 ohm low-loss coaxial cable, such as RG-8U. Shure offers pre-terminated antenna cables ranging from 6 to 100 feet.
NOTE: When ordering cables from Shure, select the low-loss "Z" models (available for longer cables) when using frequency bands above 1000 MHz.
The DC bias voltage can be disabled on UA845UWB units built after August 10, 2018.
Note: The build date is printed on the bottom of the unit.
To disable the DC bias voltage:
To enable the DC bias voltage:
| Band 1 | 174 to 216 MHz |
| Band 2 | 470 to 960 MHz |
| Band 3 | 1240 to 1260 MHz |
| Band 4 | 1492 to 1525 MHz |
| Band 5 | 1785 to 1805 MHz |
0 dB, typical
| Receiver Antenna Input, Output Ports1 to 4 | -2 dB to +2 dB |
| Receiver Antenna Input, Cascade Output | -1 dB to +1 dB |
>25 dB, typical
24 dBm, typical
100 to 240 V AC, 50/60 Hz
15 V DC, 4 Connectors
Combined total from all DC outputs
2.5 A, maximum
50 Ω
-18°C (0°F) to 63°C (145°F)
44.5 x 482.6 x 295.3 mm H x W x D (1.75 x 19 x 11.6in.)
3.32 kg (7.3 lbs)
BNC
Typical without powered antenna attached or receivers connected to the DC outputs
14.1 W per unit
The CE Declaration of Conformity can be obtained from Shure Incorporated or any of its European representatives. For contact information please visit www.shure.com
The CE Declaration of Conformity can be obtained from: www.shure.com/europe/compliance
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
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 relevant European directives and is eligible for CE marking.
Licensing: A ministerial license to operate this equipment may be required in certain areas. Consult your national authority for possible requirements. Changes or modifications not expressly approved by Shure Incorporated could void your authority to operate the equipment. Licensing of Shure wireless microphone equipment is the user’s responsibility, and licensability depends on the user’s classification and application, and on the selected frequency. Shure strongly urges the user to contact the appropriate telecommunications authority concerning proper licensing, and before choosing and ordering frequencies.
NOTE: This Radio equipment is intended for use in musical professional entertainment and similar applications. This Radio apparatus may be capable of operating on some frequencies not authorized in your region. Please contact your national authority to obtain information on authorized frequencies and RF power levels for wireless microphone products.
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