Shure UA834 Manuel utilisateur
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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.
Publications User Guides UA834 (English)
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Table of Contents
General Description
Indicators and Settings
Installation
Antenna Placement
Setting Gain
Specifications
Certifications
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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.
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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
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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.
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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.
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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
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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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