Shure UA834 Manual de usuario

5/24/17, 11)13 AMShure Publications

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UA834

In-Line Antenna Amplifier

General Description

The UA834 provides more flexibility in wireless

installations by increasing the allowable length of cable

runs between a receiver and antenna. Antennas may be

placed closer to the stage, or installed on ceilings and

walls that maintain a better line of sight with the

transmitter.

Features

Low-noise signal amplifier compensates for insertion

loss in coaxial cable

Compatible with Shure Wireless Systems. Also may

be used with Shure UA845 and UA844 Antenna

Distribution Systems

Integrated threaded adapter mounts easily to

microphone stands or the supplied surface-mount

bracket

Two-position gain selector switch

LED indicator for RF signal overload

Shure quality, ruggedness, and reliability

NOTE: Antenna amplifiers are intended to compensate for signal

loss in cables, not for increasing the range of the antenna.

Attempting to “boost” the signal beyond nominal levels only

results in overloading the circuit and reducing performance.

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General Description

Indicators and Settings

Installation

Antenna Placement

Setting Gain

Specifications

Certifications

5/24/17, 11)13 AMShure Publications

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Indicators and Settings

ɠ DC

POWER/RF

OVERLOAD

Green: Indicates it is receiving power from

the antenna input on the receiver or

combiner.

Red: Signal from the antenna (at the TO

ANTENNA input) is too strong. Remove the

inline amplifier or move it further down the

cable run.

ɡ GAIN Set the gain switch to +6 dB for shorter cable

runs, and +12 dB for longer runs.

RF Overload

RF overload can occur at the input to the inline amplifier

or at the input to the receiver. An overload at either point

degrades the signal.

When there is an RF overload indicator on the inline

amplifier, the amplifier might not be necessary, or it

should be placed further down the cable run at a

midpoint between the antenna and receiver. The gain

switch only affects output gain, and cannot compensate

for input overload at the amplifier.

If there is an RF overload signal on the receiver, reduce

the gain on the inline amplifier, or move it further up the

cable run so there is more cable between the receiver and

the amplifier. Note that the overload level for the

amplifier might be greater than that for the receiver input,

so it cannot be used to indicate whether the signal will

overload the receiver at that point in the cable run.

5/24/17, 11)13 AMShure Publications

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Installation

Connect between the antenna and receiver (or antenna

distribution system), as shown. The DC POWER LED

illuminates green when the receiver is powered on.

Use Shure low-loss coaxial antenna cable (or any 50

ohm, low-loss cable.

The quality of the cable, not just the length,

contributes to signal loss. A lighter grade 50 foot

cable may require more gain than a 100 foot, low-loss

cable.

Active antennas, such as the UA874, have a built-in

amplifier, and may not require additional

amplification.

Caution: Use only Shure antenna accessories to ensure

the best operation. Do not use splitters, combiners, or

antennas that provide a DC ground. If necessary, use a

BNC DC block device (compatible with the receiver RF

band).

Attach the antenna to the connector labeled TO ANTENNA

5/24/17, 11)13 AMShure Publications

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Use the supplied surface-mount bracket on walls or ceilings, or

mount on a standard microphone stand.

Use a maximum of two in-line antenna amplifiers for extremely

long cable runs or for two runs of lighter-grade cable, as shown

Cable Maintenance

To maintain top performance for antenna cables:

Avoid sharp bends or kinks in the cables.

Do not deform cables with makeshift clamps, such as

bending a nail over the cable.

Do not use in permanent outdoor installations.

Do not expose to extreme moisture.

5/24/17, 11)13 AMShure Publications

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Selecting Antenna Cables

Use 50 ohm low-loss coaxial cable, such as RG-8U. Shure

offers pre-terminated antenna cables ranging from 6 to

100 feet.

NOTE: When ordering cables from Shure, select the low-loss "Z"

models (available for longer cables) when using frequency bands

above 1000 MHz.

Antenna Placement

Use the following guidelines when mounting antennas:

Antennas and receivers must be from the same band.

Mount antennas at least one wavelength (two feet)

apart.

Position antennas so there is nothing obstructing a

line of sight to the transmitter (including the

audience).

Keep antennas away from metal objects.

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. If necessary, mark "trouble

spots" and ask presenters or performers to avoid those

areas.

Find More Information Online

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For more information, visit http://www.shure.com

Setting Gain

The gain setting should only be used to compensate for

the calculated cable signal loss. Additional signal gain

does not mean better RF performance. Too much gain

actually reduces reception range and the number of

available channels. This is because Shure receivers are

optimized to deliver the best performance when the sum

of signal gain and cable loss equals 0 dB. Additional gain

just amplifies everything in the RF range—including

interference and ambient RF noise. It cannot selectively

increase the signal from the transmitter.

Use the lowest gain setting necessary to achieve

good reception of the transmitter RF signal, as

indicated on the receiver’s RF LED or meter.

Only increase the gain setting to compensate for the

calculated cable loss.

The resulting signal level at the receiver (cable loss

plus amplification) should be within ±5 dB of the

original signal level at the antenna.

Calculating Gain Settings

To calculate the required gain setting, obtain the cable

manufacturer's specification for signal loss. The rated loss

usually varies with RF frequency in addition to cable

length.

Multiply the per 100 feet rating of the cable by cable

length to determine signal loss, and add gain as

necessary to compensate. For example: a 50 ft. cable with

rated loss of -12dB per 100 ft. would calculate as

(-12dB/100)*50 = -6dB and require +6dB of gain for a

sum total of 0 dB loss.

5/24/17, 11)13 AMShure Publications

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Specifications

Frequency Range

UA834V 174–216 MHz

UA834WB470–902 MHz

UA834XA 902–960 MHz

UA834Z161240–1260 MHz

UA834Z171492–1525 MHz

UA834Z181785–1805 MHz

Connector Type

BNC, Female

Impedance

50 Ω

Power Requirements

10 to 15 V DC bias from coaxial connection, 0.60–0.72 W

Signal Gain

±2 dB, Switchable

+6 dB +12 dB

Absolute Maximum RF Input

+5 dBm

RF Overload LED Threshold

±2 dB

-5 dBm

Input Third-Order Intercept Point (IIP3)

>10 dBm

Housing

5/24/17, 11)13 AMShure Publications

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Cast Aluminum, black painted finish

Dimensions

67 x 32 x 112 mm (H x W x D) Dimensions with Stand: 108

x 32 x 112 mm

Net Weight

Without Mounting Stand0.28 kg (9.8 oz.)

With Mounting Stand 0.42 kg (14.8 oz.)

Certifications

This product meets the Essential Requirements of all

relevant European directives and is eligible for CE

marking.

The CE Declaration of Conformity can be obtained from:

www.shure.com/europe/compliance

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Jakob-Dieffenbacher-Str. 12

75031 Eppingen, Germany

Phone: 49-7262-92 49 0

Fax: 49-7262-92 49 11 4

Email: [email protected]

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