Shure UA830 User Guide

SHURE MODEL UA830

UHF IN-LINE RF AMPLIFIER

©2005, Shure Incorporated
27D8643 (Rev. 8)

Printed in U.S.A.

GENERAL

The Shure UA830 is a low-noise, in-line antenna amplifier. The
UA830 is intended for remote-mounting antennas to a Shure Model
U4 or ULX receiver or Model UA845, or UA844 distribution amplifier
in a large installation, effectively shortening the distance from the
transmitters. The unit receives power through its output port from the
Shure receiver or distribution amplifier. When an antenna is re­mote-mounted, the UA830 amplifies the received radio signals to
compensate for insertion loss in the coaxial cable. A gain selector
switch adjusts for longer lengths of coaxial cable.

FEATURES

• Compatible with the Shure Model U4 or ULX wireless
microphone receiver and the Shure Model UA845, or UA844
Antenna Distribution System

• Mountable on supplied desk-/wall-mount or on a microphone
stand

• Two-position gain selector switch to adjust for longer coaxial
cable lengths (3 dB position for cables under 7 1/2 m [25 ft],
10 dB position for cables over 7 1/2 m [25 ft])

• Isolates antennas from cable interactions

• Extremely durable under the heaviest use

• Shure quality, ruggedness, and reliability

APPLICATION

Techniques will vary from setup to setup according to different situ­ations. Usually, the antennas should be as far apart as possible, cre­ating the widest RF field and ensuring signal reception. In a diversity
system such as the Shure Model U4, as in the example in Figure 1,
Shure recommends that the two antennas be positioned at 45° an­gles pointing away from each other (Figure 1). This way, the system
is guaranteed the widest possible RF field, minimizing the chance of
the RF signal dropping out. As a general recommendation, position­ing should be tested and adjusted for each individual setup.

SHURE MODEL U4

45

IN A DIVERSITY SYSTEM

FIGURE 1

INSTALLATION

1. Thread the Shure Model UA830 unit on the supplied stand (Fig­ure 2), or on a 5/8 in.-27 thread microphone stand.

2

2. Connect the antenna to the TO ANTENNA port on the Model
UA830 unit (Figure 2).

3. Using 50 W low-loss coaxial cable (purchased separately,
Shure UA825 or UA850 or UA8100 recommended), connect
the TO RECEIVER port of the UA830 to the Shure Model U4 or
ULX wireless receiver or UA845, or UA844 Antenna
Distribution System (see Figure 3 for U4 Receiver example).

4. If a second UA830 Line Amplifier is needed for extremely long
cable runs (over 15 m [50 ft]), (Shure model U4 and UA845
only) repeat steps 1 to 3. See Adjusting for Different Cable
Lengths.

TO ANTENNA

2.

1.

ATTACHING THE BASE AND ANTENNA

FIGURE 2

WALL MOUNTED

3.

TO RECEIVER

ANTENNA IN

U4 WIRELESS
RECEIVER

CONNECTING THE RECEIVER

FIGURE 3

3

MIC-STAND MOUNTED