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Active Directional Antenna
General Description
The Shure UA874 uses a log periodic dipole array to offer enhanced re-
ception when directed toward the desired coverage area. An integrated
amplifier and four gain settings compensate for varying degrees of coaxial
cable signal loss. The UA874 can be mounted on a microphone stand,
suspended from the ceiling, or mounted to a wall using the integrated
swivel adapter bracket.
Features
• Low-noise signal amplifier compensates for insertion loss in coaxial
cable
• Compatible with Shure wireless receivers and antenna distribution
systems that provide 10–15 V DC bias
• Integrated threaded adapter mounts easily to microphone stands
• Four-position gain selector switch
• Shure quality, ruggedness, and reliability
Interface
① Gain Switch
Adjust the four-position gain switch to compensate for the calculated
cable loss, based on the length and type of cable.
Caution: There may be a small RF dropout when changing the gain
setting.
② Gain Mode LED
Indicates the current gain switch setting.
③ RF Overload LED
Indicates a strong RF signal that is overloading the antenna amplifier,
which results in distortion or poor performance. Increase the distance
between the antenna and transmitter, or lower the antenna gain
setting.
NOTE: RF Overload LED does not operate for passive gain settings
(−6 dB or 0 dB).
④ BNC Connector
Connect to a reciever or antenna combiner with RF inputs that supply
10–15 V DC bias.
Installation
• Connect the antenna to the receiver or distribution system using
Shure antenna cables (or any 50 ohm, low-loss coaxial cable, such as
RG-8U).
• The antenna only operates with receivers or distribution systems that
provide 10–15 V DC bias.
• Lower the gain setting for short cable runs, or increase gain for longer
runs. Note that the quality of the cable, not just the length, contributes
to signal loss. A lighter-grade 50 foot cable may require more gain than
a 100 foot, low-loss cable. Contact the cable manufacturer for cable
loss specifications.
• Direct the antenna toward the intended coverage area.
• Do not use this antenna for transmitting (such as with PSM
transmitters)
Cable Maintenance
To maintain top performance for UA825, UA850 or UA8100 antenna
cables:
• Avoid sharp bends or kinks in the cables.
• Do not deform cables with makeshift clamps, such as bending a nail
over the cable.
• Do not use in permanent outdoor installations.
• Do not expose to extreme moisture.
Antenna Cables from Shure
Shure offers the following pre-terminated antenna cables:
Length Type Model No.
6 foot RG58 UA806
10 foot RG58 PA725
25 foot RG8X UA825
50 foot RG213 UA850
100 foot RG213 UA8100