Shure UA870 User Manual (English)

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MODEL UA870 UHF ACTIVE DIRECTIONAL ANTENNA

The Shure UA870 is an active UHF wireless directional

antenna designed for use with the Shure UHF Wireless Sys-

tem. 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 de-

sired coverage area and greater rejection of RF signals out-

side 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 Receiver or a Shure UA840 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 re-

sistant 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 Receiver or UA840 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.) 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, se-

lect the 10 dB position. To access the gain switch, re-

move the cover of the preamplifier box (printed side) by

unscrewing the four screws at each corner. Gain set-

tings 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 in-

tended coverage area. See Figure 1.

4. Connect the other end of the antenna cable to the U4

Receiver or UA840 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 place-

ment 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.

Model UA870 UHF Active Directional Antenna

User Guide

Shure Brothers Incorporated

222 Hartrey Avenue

Evanston IL 60202-3696 U.S.A.

E1997, Shure Brothers Incorporated

Printed in U.S.A.

27A8629 (QJ)

www.audiovias.com

Product Information

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Specifications8 pages

Manual1 page

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Shure UA870 Specifications

RF Frequency Range

UA870A frequency range	782-810 MHz
UA870KK frequency range	838-862 MHz
UA870MB frequency range	800-830 MHz
UA870MC frequency range	774-782 MHz
UA870UB frequency range	692-716 MHz
UA870WB frequency range	470-900 MHz
UA870USTV frequency range	470-698 MHz
UA870X frequency range	944-952 MHz

Power

power source	Remote 12 Vdc from coaxial cable
power consumption for models A, KK, MB, MC, UB, X	0.81 W (12 Vdc)
power consumption for models WB, USTV	0.68 W (12 Vdc)

Amplifier Gain

amplifier gain for models A, KK, MB, MC, UB, X at 3 dB	3 dB ± 2 dB
amplifier gain for models A, KK, MB, MC, UB, X at 10 dB	10 dB ± 2 dB
amplifier gain for models WB, USTV at 3 dB	–2 dB, +1.5 dB
amplifier gain for models WB, USTV at 10 dB	–1 dB, +3.0 dB

Reception Pattern

reception pattern type	Directional; Cardioid
3dB beam width	100 degrees

Antenna Gain

antenna gain	7 dB typical (on axis)
third order intercept point at output	More than 30 dBm
amplifier gain indicators for 3 dB	Green LED
amplifier gain indicators for 10 dB	Red LED

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