SHURE MODEL UA830
UHF ACTIVE REMOTE ANTENNA KIT
The Shure UA830 is a low-noise, in-line antenna amplifier.
The UA830 is intended for remote-mounting antennas to a
Shure Model U4 receiver or Model UA840 distribution ampli-
fier 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 wireless micro-
phone receiver and the Shure Model UA840 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
INSTALLATION
1.
Thread the Shure Model UA830 unit on the supplied
stand (Figure 1), or on a
5
/
8
in.-27 thread microphone
stand.
1.
2.
TO ANTENNA
ATTACHING THE BASE AND ANTENNA
FIGURE 1
2.
Connect the antenna to the TO ANTENNA port on the
Model UA830 unit (Figure 1).
3.
Using 50
Ω
low-loss coaxial cable (purchased separate-
ly, Shure UA825 or UA850 recommended), connect the
TO RECEIVER port of the UA830 to the Shure Model U4
wireless receiver or UA840 Antenna Distribution Sys-
tem (Figure 2).
4.
If a second UA830 Line Amplifier is needed for extreme-
ly long cable runs (over 15 m [50 ft]), repeat steps 1 to
3. See
Adjusting for Different Cable Lengths.
U4 WIRELESS
RECEIVER
3.
TO RECEIVER
ANTENNA IN
W
ALL MOUNTED
MIC-ST
AND MOUNTED
CONNECTING THE RECEIVER
FIGURE 2
APPLICATION (FIGURE 3)
Techniques will vary from setup to setup according to different
situations. Usually, the antennas should be as far apart as pos-
sible, creating the widest RF field and ensuring signal reception.
In a diversity system such as the Shure Model U4, as in the ex-
ample in Figure 3, Shure recommends that the two antennas be
positioned at 45
°
angles pointing away from each other (Figure
3). 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.
45
_
SHURE MODEL U4 (OR MODEL UA840)
IN A DIVERSITY SYSTEM
FIGURE 3
4
5
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