Shure UA870 - Manual

MODEL UA870
UHF ACTIVE DIRECTIONAL ANTENNA
©2008 Shure Incorporated Printed in USA
27C8629 (Rev. 6)
MODEL UA870 UHF ACTIVE DIRECTIONAL ANTENNA
The Shure UA870 is an active UHF wireless directional antenna. It featUR4es 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 amplifi er
that offers user selectable 3 or 10 dB gain. The gain setting is indicated by two
LEDs. Remote 12 Vdc power for the antenna amplifi er is provided by a Shure UR4 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
Determine the length of cable required to connect the UA870 Antenna to the 1.
UR4 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.
Set the gain switch to the appropriate setting. If you are using coaxial cables up 2.
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 preamplifi er box (printed side) by unscrewing the foR UR4 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.
Connect one end of the antenna cable to the UA870. Then mount the antenna so 3.
that it points toward the intended coverage area. See Figure 1.
Connect the other end of the antenna cable to the UR4 or ULX Receiver or
4.
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 dUR4ing a speech or performance. Experiment with antenna placement to
fi nd the optimum location for the UA870.
FIGURE 1
ABBILDUNG 1
FIGURA 1
NOTE: For additional technical assistance, call the Shure Customer Service
Department for your region.
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
UA870USTV ........................................................................... 470-698 MHz
UA870X ................................................................................. 944-952 MHz
Power Source
Remote 12 Vdc from coaxial cable connection to receiver or
antenna distribution system.
Power Consumption
UA870 (A, KK, MB, MC, UB, X): ............................................ 0.81 W (12 Vdc)
UA870 (WB, USTV): ................................................................. .68W (12Vdc)
Antenna Gain
..................................................................................... 7 dB typical (on axis)
Amplifi er Gain
UA870 (A, KK, MB, MC, UB, X): ....................Gain Switch at 3 dB: 3 dB ± 2 dB
...............................................................Gain Switch at 10 dB: 10 dB ± 2 dB
UA870 (WB, USTV) .................................... 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
Amplifi er Gain Indicators
3 dB: ........................................................................................... Green LED
10 dB: ............................................................................................ Red LED