Shure PA421B Four-channel Antenna Combiner, 470-865 MHz

The PA421B is a four-to-one wideband antenna combiner for Shure PSM wireless systems, covering 470 to 865 MHz. It combines the RF outputs of up to four P3T, P9T, or P10T transmitters into a single output feeding one transmit antenna, reducing rack clutter, intermodulation distortion, and multipath dropouts. Four input LEDs indicate signal presence and overload, a temperature-sensitive fan keeps noise and heat low, and an expansion port allows two combiners to be daisy-chained. Compatible with PSM300, PSM 900, and PSM 1000.