3
Interface
Active Directional Antenna
General Description
The Shure UA874 uses a log periodic dipole array to offer enhanced
reception 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.
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 receiver or antenna combiner with RF inputs that
supply 10–15 V DC bias.
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
Note:
The antenna
will not operate
without 10-15 V DC bias. This is
required even at -6 dB and 0 dB ("passive") gain settings.
Summary of Contents for ua874V
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