MODEL UA870 UHF ACTIVE DIRECTIONAL ANTENNA

The Shure UA870 is an active UHF wireless directional antenna.
It features a log periodic dipole array. When compared to an omnidirectional
1/2-wave antenna, the cardioid pattern provided by the
UA870 offers enhanced reception of the desired coverage area and
greater rejection of RF signals outside the coverage area.
To compensate for coaxial cable signal loss, the UA870 has an
on-board amplifier that offers user selectable 3 or 10 dB gain. The
gain setting is indicated by two LEDs. Remote 12 Vdc power for the
antenna amplifier is provided by a Shure U4 or ULX Receiver or a
Shure UA845 or UA844 Antenna Distribution System through the
connecting coaxial cable.
The UA870 can be mounted on a microphone stand, suspended
from the ceiling, or mounted to a wall using the integrated
swivel adapter bracket. The UA870 is weather resistant for use outdoors.
For best diversity performance, use two UA870 antennas.



INSTALLATION INSTRUCTIONS

1. Determine the length of cable required to connect the UA870
Antenna to the U4 or ULX Receiver or UA845 or UA844 Antenna
Distribution System.
IMPORTANT:
Always use low-loss 50 ohm cable, such as RG-8X or equivalent.
Shure UA825 7.6 m (25 ft.) or UA850 15.2 m (50 ft.) or
UA8100 30.4 m (100 ft) cables are recommended.

2. Set the gain switch to the appropriate setting. If you are using
coaxial cables up to 7.6 m (25 ft.) long, select the 3 dB position.
If using cables 7.6 m (25 ft.) or longer, select the 10 dB
position. To access the gain switch, remove the cover of the
preamplifier box (printed side) by unscrewing the four screws
at each corner. Gain settings are marked on the pc board inside.
NOTE: The UA870 gain control is factory preset at the 10 dB
position.

3. Connect one end of the antenna cable to the UA870. Then
mount the antenna so that it points toward the intended coverage
area. See Figure 1.

4. Connect the other end of the antenna cable to the U4 or ULX
Receiver or UA845 or UA844 Antenna Distribution System.
The gain LED on the UA870 illuminates to verify that power
is being provided to the antenna.
IMPORTANT:
Always perform a “walk around” test to verify coverage before
using a wireless system during a speech or performance.
Experiment with antenna placement to find the optimum
location for the UA870.
FIGURE 1
NOTE: For additional technical assistance, call the Shure
Customer Service Department at 1-800-434-3350. In Europe,
phone 49-7131-72140.




SPECIFICATIONS

RF Frequency Range
UA870A 782-810 MHz . . . . . . . . . . . . . . . . . . . . . . .
UA870KK 838-862 MHz . . . . . . . . . . . . . . . . . . . . .
UA870MB 800-830 MHz . . . . . . . . . . . . . . . . . . . . .
UA870MC 774-782 MHz . . . . . . . . . . . . . . . . . . . . .
UA870UB 692-716 MHz . . . . . . . . . . . . . . . . . . . . .
UA870WB 470-900 MHz . . . . . . . . . . . . . . . . . . . . .

Power Source
Remote 12 Vdc from coaxial cable connection to receiver or
antenna distribution system.

Power Consumption
UA870 (A, KK, MB, MC, UB):
0.81 W (12 Vdc)
UA870WB: .68W (12Vdc)

Antenna Gain
7 dB typical (on axis)

Amplifier Gain
UA870 (A, KK, MB, MC, UB):
Gain Switch at 3 dB: 3 dB ± 2 dB
Gain Switch at 10 dB: 10 dB ± 2 dB
UA870WB: Gain Switch at 3 dB (?2, 1.5 dB)
Gain Switch at 10 dB (?1 dB, 3.0 dB)

Third Order Intercept Point (3OIP) at output
More than 30 dBm

Reception Pattern
Directional; Cardioid
3dB Beam Width: 100 degrees

Amplifier Gain Indicators
3 dB: Green LED
10 dB: Red LED

Connector
Female, BNC-type

Dimensions
UA870 (A, KK, MB, MC, UB):
8.90 in. (226 mm) H X 9.21 in. (234 mm) W X 1.60 in.
(40.7 mm) D
UA870WB: 12.45 in. (316.2 mm) H X 14.15 in.
(359.4 mm) W X 1.40 in. (35.5 mm) D

Stand Adapter
Positive-action, break resistant, adjustable from 0 to 90 degrees,
with standard 5/8 in. -27 thread

Net Weight (without cable)
UA870 (A, KK, MB, MC, UB):
8 oz. (227 grams)
UA870WB: 11.2 oz (317 grams)




CERTIFICATION
The Shure Model UA870 UHF Active Directional Antenna meet
the essential requirements of the European R&TTE Directive
99/5/EC and is eligible to carry the CE marking. Meets Requirements
of EMC Standard EN 301 489 Parts 1 and 9.




IMPORTANT!
THIS RADIO EQUIPMENT IS INTENDED FOR USE IN MUSICAL PROFESSIONAL ENTERTAINMENT AND SIMILAR APPLICATIONS.
NOTE: 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 FOR WIRELESS
MICROPHONE PRODUCTS IN YOUR REGION