Shure PA821B Specification Sheet

Product Speciﬁcations

PA821B Antenna Combiner

PA821B Antenna Combiner (front and rear views)

Overview

Shure PA821B Antenna Combiners are complementary accessories for Shure PSM® Personal Stereo Monitor systems. When multiple systems are required for monitoring applications, the PA821B combiners quietly and efficiently optimize RF management for up to eight PSM transmitters when racked in a central location, while also reducing rack clutter. (Directly replaces PA821A).

Features

• Combines up to eight PSM® transmitters to a single antenna set

- Improved intermodulation artifacts for cleaner RF environment

- Reduces rack clutter

• Wideband operation (470-865 MHz or 865-960 MHz)

• Daisy-chain up to 2 combiners with the expansion port

• LED indications of signal presence, signal overload

• Improved fan design significantly improves thermal efficiency and ambient noise

• Optional modification to enable combining of microphone receiver antennas (contact Shure Service Department for more details)

- Provides +15V bias on RF inputs to power antennas

- Requires modification of unit by qualified service technician

Available Models

PA821B Eight-port PSM Antenna Combiner, 470-865 MHz PA821BX Eight-port PSM Antenna Combiner, 865-960 MHz

Specifications

RF Frequency Range PA821B: 470-865 MHz

Impedance 50 Ω Operating Temperature Range −18 °C (0 °F) to 63 °C (145 °F) Power Requirements 100 to 240 V AC, 50-60 Hz Current Drain 1.59 A (referenced at 100 V AC) (159 VA) Power Consumption 143 W max.

RF Input

Connector Type BNC Conﬁguration Active Impedance 50 Ω RF Gain 0 dB (±2 dB) LED Indicator Min. Detection Threshold 2.5 dBm LED Indicator Overload Threshold >24 dBm

Main Output

Connectory Type BNC Impedance 50 Ω

Expansion Port

Connector Type BNC Conﬁguration Passive Impedance 50 Ω Insertion Loss <4 dB RF Expansion Port Normal Operating Range 33 dBm (2 W)

PA821BX: 865-960 MHz

Included Accessories

IEC Power Cord Four (4) 2 ft. DC power output cables Four (4) 22 in. coaxial cables, BNC terminated One (1) 11 in. coaxial cable, BNC terminated

Optional Accessories

Passive omnidirectional antenna Passive directional antenna Helical antenna BNC-terminated coaxial cables (RG-8X/U; various lengths)

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