Shure UA870 User Manual

MODEL UA870

UHF ACTIVE DIRECTIONAL ANTENNA

FIGURE 1

ABBILDUNG 1

FIGURA 1

NOTE: For additional technical assistance, call the Shure Customer Service

Department for your region.

SPECIFICATIONS

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.

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.

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.

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