Shure PA421B Specification Sheet

Product Speciﬁcations

PA421B Antenna Combiner

PA421A Antenna Combiner (front and rear views)

Overview

Shure PA421B Antenna Combiners are complementary accessories for Shure PSM® Personal Stereo Monitor systems. When multiple systems are required for monitoring applications, the PA421B combiners quietly and efficiently optimize RF management for up to four PSM® transmitter, while also reducing rack clutter. (Directly replaces PA421A.)

Features

• Combines up to four PSM

- 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

• Provides DC power to compatible IEM transmitters

• LED indications of signal presence, signal overload and current draw

• 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

PA421B Four-channel Antenna Combiner, 470-865 MHz PA421BX Four-channel Antenna Combiner, 865-960 MHz

transmitters to a single antenna set

Specifications

RF Frequency Range PA421B: 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 1.09 A (referenced at 100 V AC) (109 VA) Power Consumption 98 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)

DC Outputs

Output Voltage 15 V DC Output Current (Per Output) 660 mA max Output Power (Per Output) 9.9 W LED Indicator Min. Detection Threshold 85 mA LED Indicator Overload Threshold >660 dBm

PA421BX: 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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