7ENGLISH
MODEL UA845 ANTENNA DISTRIBUTION SYSTEM
The Shure Model UA845 is an amplified, UHF Antenna Distribution System
that expands a wireless microphone system by splitting one pair of antennas
to multiple Shure UR4 or Shure ULX4 wireless receivers. It also amplifies
RF signals to compensate for insertion loss due to splitting signal power to
mulitple output connectors. Each UA845 allows up to four receivers to use
the same antennas. CASCADE connectors allows connections to a fifth re-
ceiver or a second UA845. There are also power connectors for powering
Shure UHF Wireless systems.Each system contains the following items:
•
UA845 Antenna Distribution System
•
Rack-mounting hardware
•
Surface-mounting hardware
•
Front-mounting antenna hardware
•
18-in. Power OUTPUT Cord
•
Power Cord
•
Antenna cables for receiver connections
The Shure Model UA845 ensures maximum sensitivity and signal processing
capability, providing the widest radio range possible for the largest number
of wireless receivers. To get the most from this system, follow these guide-
lines:
•
When using long runs of cable for remote-mounted antennas, use the
UA830 In-Line RF Amplifier and the Shure Model UA825 or UA850 Re-
mote Antenna Extension cables (RG-8/X or equivalent), which have low
loss at UHF operating frequencies
•
Locate multiple transmitters more than 3 m [10 ft] from receiving
antennas
SYSTEM FEATURES
• Expandability.
The UA845 UHF Antenna Distribution System is designed
for large UHF wireless systems. Each unit allows up to four wireless re-
ceivers to use the same two antennas, and the CASCADE ports allow con-
nection to a fifth receiver or a second UA845.
• Compatibility.
The UA845 is compatible with all Shure wireless micro-
phone receivers operating within a compatible frequency range (see
UHF
Carrier Frequency Ranges
in the Specifications section).
• CASCADE Ports.
Two 50
, BNC-type antenna CASCADE ports allow an
additonal UA845 unit or a fifth wireless receiver. A large wireless system
can be run off of a single pair of antennas.
• Power OUTPUT and OUT Connectors.
Up to five (5) UR4 receivers can
be daisy-chained and powered from a single source via the Power OUT-
PUT connectors.
• Low Noise and Intermodulation Distortion.
The UA845 maintains clean
signals with minimal distortion.
• Insertion Loss Compensation.
Whenever a signal is split to multiple out-
put ports, there is a loss in signal strength. The UA845 amplifies signals
to compensate, ensuring a strong signal to the receivers.
• Front-Mounted Antennas.
The UA845 comes with hardware to
front-mount the antennas, if desired.
CONTROLS AND CONNECTORS
FRONT PANEL
BACK PANEL
AC Power INPUT Connector.
AC Power OUTPUT Connector. Each UA845 has a Power
OUTPUT connector for daisy-chaining up to five (5) Shure
Model UR4 UHF Diversity Single or Dual Receivers to a
single power source.
NOTE: This connector does not work for Shure ULX4 Receivers.
ANTENNA IN Ports, Channel A & B. BNC-type connectors
for antennas.
RF CASCADE Connectors (Output connector 5),
Channel A & B. BNC-type connectors for adding a fifth
receiver, or additional UA845's, permitting more wireless
receivers to be connected.
RF OUTPUT Connectors, Channel A & B. BNC-type con-
nectors for up to four wireless receivers.
UA845
UHF ANTENNA DISTRIBUTION SYSTEM
1 2
POWER INDICATOR
POWER ON/OFF
SWITCH
(3 pages)
(7 pages)
(16 pages)
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