Shure PSM1000 PA821B Antenna Distributor
Shure PA821B Antenna Combiners are complementary accessories for Shure PSM Personal Stereo Monitor systems. When multiple systems are required for monitoring environments, the PA821B combiners quietly and efficiently reduce rack clutter and optimize RF management for up to eight PSM transmitters when racked in a central location.
PA821B replaces PA821A
Contact Shure Service Department for more detail and availability. Requires modification of unit by qualified service technician.
Features:
Combines up to eight PSM transmitters to a single antenna set
Improves RF networking
Reduces rack clutter 
Wideband operation (470–865 MHz or 865–960 MHz)
8 Input LED Signals (green when active; off when inactive)
Quieter fan for significant reductions in ambient unit noise
Temperature-sensitive fan power for significant reductions in ambient unit heat
LED indications of signal presence and signal overload
Passive (non-powered) antenna combining*
Shure PA821B Antenna Combiners are complementary accessories for Shure PSM Personal Stereo Monitor systems. When multiple systems are required for monitoring environments, the PA821B combiners quietly and efficiently reduce rack clutter and optimize RF management for up to eight PSM transmitters when racked in a central location.
PA821B replaces PA821A
Contact Shure Service Department for more detail and availability. Requires modification of unit by qualified service technician.
Features:
Combines up to eight PSM transmitters to a single antenna set
Improves RF networking
Reduces rack clutter 
Wideband operation (470–865 MHz or 865–960 MHz)
8 Input LED Signals (green when active; off when inactive)
Quieter fan for significant reductions in ambient unit noise
Temperature-sensitive fan power for significant reductions in ambient unit heat
LED indications of signal presence and signal overload
Passive (non-powered) antenna combining*