Installation Instructions

Model UA870 UHF Active Directional Antenna User Guide

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 be- fore using a wireless system during a speech or perfor- mance. Experiment with antenna placement to find the opti- mum location for the UA870.

MODEL UA870 UHF ACTIVE DIRECTIONAL ANTENNA

The Shure UA870 is an active UHF wireless directional anten- na. It features a log periodic dipole array. When compared to an om- nidirectional 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, sus- pended from the ceiling, or mounted to a wall using the integrated swivel adapter bracket. The UA870 is weather resistant for use out- doors. For best diversity performance, use two UA870 antennas.

1.Determine the length of cable required to connect the UA870 Antenna to the U4 or ULX Receiver or UA845 or UA844 Anten- na Distribution System.

IMPORTANT:

Always use low-loss 50 ohm cable, such as RG-8X or equiva- lent. 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 posi- tion. 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 in- side.

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 cover- age area. See Figure 1.

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):

0.81W (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

2003, Shure Incorporated		Printed in U.S.A.
27C8629 (CA)		Printed in U.S.A.
27C8629 (CA)

UA870 specifications

The Shure UA870 is an advanced antenna designed specifically for wireless microphone systems, serving as an essential accessory for both professional and amateur audio engineers. Its sleek and innovative design ensures that it not only performs exceptionally well but also integrates seamlessly into a variety of settings, from live concerts to broadcasting studios.

One of the standout features of the UA870 is its wideband operation. With a frequency range of 470 to 952 MHz, it allows for flexibility in various wireless systems, accommodating multiple channels without compromising audio quality. This broad frequency range is particularly beneficial for large events where multiple performers or speakers may be using different frequencies simultaneously.

The UA870 utilizes a unique design that includes two high-gain elements, offering excellent signal reception in challenging environments. This dual-element configuration enhances its directionality, effectively rejecting unwanted signals and reducing interference from other wireless devices. This means that users can expect a much clearer and more reliable transmission, a vital factor in settings where audio fidelity is critical.

Another essential technology incorporated in the UA870 is its passive construction, which means it does not require a power supply to operate. This aspect not only simplifies the setup process but also enhances reliability since there are fewer potential points of failure. The passive nature of the antenna contributes to its robustness, making it a long-lasting addition to any audio setup.

The UA870 also features a compact and lightweight design, making it easy to mount and transport. Its versatility allows it to be installed in a variety of configurations, including wall or ceiling mounts and on stands. This adaptability is crucial for sound engineers who need to quickly modify setups based on venue requirements or production needs.

Finally, the Shure UA870 antenna is built with durability in mind. Its rugged construction ensures it can withstand the rigors of both indoor and outdoor use, providing peace of mind for audio professionals who demand reliability. Overall, the Shure UA870 combines innovative technology with practicality, making it a top choice for those seeking optimal wireless audio performance.