2
GENERAL
The Shure UA830 is a low-noise, in-line antenna amplifier. The UA830
is intended for remote-mounting antennas to a Shure Model UR4 or ULX
receiver or Model UA845, or UA844 distribution amplifier in a large in-
stallation, 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 co-
axial cable.
FEATURES
• Compatible with the Shure Model UR4 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
IMPORTANT: DO NOT USE INFORMATION
This device must not be used with antennas or other
devices that have a DC short circuit at their feed point without using an
external (BNC) DC Block. A suitable BNC DC Block is the JFW Industries Model
50DB-002.
Techniques will vary from setup to setup according to different situa-
tions. 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 UR4, as in the example in Figure 1, Shure rec-
ommends 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 drop-
ping out. As a general recommendation, positioning should be tested
and adjusted for each individual setup.
IN A DIVERSITY SYSTEM
FIGURE 1
45
antenna A in
12.7V out
150mA
receiver outputs
200
Ω
lift
GND
line
mic
antenna B in
12.7V out
150mA
network
activity
networking
ethernet
RJ-45
45
