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Shure Incorporated
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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 bottom 4 LEDs indicate current draw for each DC output.
Green
= Device is powered on.
Red
= Current overload.
Off
= inactive
PA421B and PA421BX
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
Note:
A minimum of RF signal is required to activate the channel. See Specifications page for more information.