Shure UA830 manual General, Application, Features

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.

antenna B in		receiver outputs
		200Ω
12.7V out	line	lift
150mA	mic	GND

networking	antenna A in
network
activity
ethernet	12.7V	out
RJ-45	150mA

45

45

IN A DIVERSITY SYSTEM

FIGURE 1

2