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Powering the Combiners
1. Turn power off before connecting components.
2. Use the supplied power cable to connect the combiner from the power input to an AC source.
3. Turn on the power switch. The power LED will illuminate.
4. Power the unit off when not in use.
Warning! Opening the unit can result in permanent damage and may result in an undesirable change in performance. There are no user-
serviceable parts inside.
LED Indicators
PA421B and PA421BX
The top 4 RF LED indicators display input signal presence.
• Green = active
• Red = RF input signal overload
• Off = inactive
The PA421B and PA421BX combiners supply 15 V at up to 660 mA to
each DC output. These may be used to power compatible Shure IEM
transmitters.
The bottom 4 LEDs indicate current draw for each DC output.
• Green = Device is powered on.
• Red = Current overload
• Off = inactive
1
1
DC OUTPUT
PA421B and PA421BX
Note: A minimum of RF signal is required to activate the channel. See Specifications page for more information.
2
3
4
2
3
4
PA821B and PA821BX
The PA821B and PA821BX antenna combiners allow up to 8
transmitters to share a single antenna. RF LED indicators display input
signal presence.
• Green = active
• Red = RF input signal overload
• Off = inactive
PA821B and PA821BX
5
1
2
3
4
5
6
7
8
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