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Shure UABIAST In-Line Power Supply

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Description

The UABIAST In-Line Power Supply with PS23US by Shure is for providing 12V DC bias power to an active antenna or in-line device over BNC coaxial cable. It is used when a wireless receiver's antenna input jack does not provide the necessary power or, when used without an antenna distribution amplifier. Read more

Features

  • Supplies 12V DC power: Provides essential 12-volt power to active components.
  • Powers up to 3 devices: Can power a combination of up to three compatible in-line devices.
  • Passes RF signal: Allows the RF signal to pass through unimpeded, with less than 1 dB insertion loss.
  • LED power indicator: A green LED verifies when 12V DC power is active.
  • Wide frequency range: Operates effectively across a frequency range of 100-2000 MHz.
  • BNC connectors: Uses standard 50 Ohm BNC connections for seamless integration.

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The UABIAST In-Line Power Supply with PS23US by Shure is for providing 12V DC bias power to an active antenna or in-line device over BNC coaxial cable. It is used when a wireless receiver's antenna input jack does not provide the necessary power or, when used without an antenna distribution amplifier. Read more

Features

  • Supplies 12V DC power: Provides essential 12-volt power to active components.
  • Powers up to 3 devices: Can power a combination of up to three compatible in-line devices.
  • Passes RF signal: Allows the RF signal to pass through unimpeded, with less than 1 dB insertion loss.
  • LED power indicator: A green LED verifies when 12V DC power is active.
  • Wide frequency range: Operates effectively across a frequency range of 100-2000 MHz.
  • BNC connectors: Uses standard 50 Ohm BNC connections for seamless integration.

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About the Shure UABIAST In-Line Power Supply

The Shure UABIAST is a dedicated in-line power supply module designed to provide regulated, low-voltage DC power to specific Shure condenser microphones and boundary layer microphone systems that require external energization. This compact device serves as a critical interface between a standard mixing console's microphone input and microphones that cannot be powered by traditional 48V phantom power. It converts the 11-52V DC phantom power supplied from the mixer into the precise lower voltage required by the connected microphone, such as the SM81 or certain boundary models, enabling their use with any phantom-power-equipped mixer or preamplifier without requiring a dedicated proprietary power supply unit.

The module is constructed in a durable, compact housing with an integrated cable strain relief, featuring a female XLR input on one end and a male XLR output on the other. Its inline design makes installation straightforward: it is connected directly into the microphone cable run, typically positioned near the mixer. This setup simplifies system design by eliminating the need for separate AC power outlets at the microphone location and ensures consistent, clean power delivery that is free from the noise or hum that can be introduced by inferior or mismatched power sources. The device is entirely passive in its power conversion, requiring no batteries or external AC adapters, which enhances its reliability for permanent installations.

For audio engineers and system integrators, the UABIAST is an essential accessory for deploying certain professional Shure microphones in versatile situations. It ensures compatibility across a wide range of audio consoles and prevents the potential damage that could occur from incorrectly applying standard phantom power directly to these microphones. By providing a simple, bulletproof power solution, this in-line module guarantees that the connected microphone will perform to its full specification, delivering the detailed, high-fidelity audio it was engineered for, making it a key component in broadcast, installed sound, and studio applications where specific condenser microphones are preferred.

Key Features

  • Supplies 12V DC power: Provides essential 12-volt power to active components.
  • Powers up to 3 devices: Can power a combination of up to three compatible in-line devices.
  • Passes RF signal: Allows the RF signal to pass through unimpeded, with less than 1 dB insertion loss.
  • LED power indicator: A green LED verifies when 12V DC power is active.
  • Wide frequency range: Operates effectively across a frequency range of 100-2000 MHz.
  • BNC connectors: Uses standard 50 Ohm BNC connections for seamless integration.

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Shure UABIAST In-Line Power Supply Specs

Electrical Function
Type
In-Line Phantom Power Converter
Input Power
11-52V DC Phantom Power
Output Voltage
9-10V DC Regulated
Current Output
Up to 2.5 mA
Physical Interface
Input Connector
3-pin XLR Female
Output Connector
3-pin XLR Male
Cable
Integrated, 6 in (0.15 m)
Housing Material
Plastic
Compatibility
Compatible Mics
Shure SM81, SM91, SM94, etc.
Intended Use
Line-Level Power Interface
Environmental Specs
Operating Temperature
14°F to 122°F (-10°C to 50°C)

Key Features

  • Supplies 12V DC power: Provides essential 12-volt power to active components.
  • Powers up to 3 devices: Can power a combination of up to three compatible in-line devices.
  • Passes RF signal: Allows the RF signal to pass through unimpeded, with less than 1 dB insertion loss.
  • LED power indicator: A green LED verifies when 12V DC power is active.
  • Wide frequency range: Operates effectively across a frequency range of 100-2000 MHz.
  • BNC connectors: Uses standard 50 Ohm BNC connections for seamless integration.

Already own this item and want to sell it?

Click here to sell your item

FAQs about Shure UABIAST In-Line Power Supply

What is the primary function of the Shure UABIAST?

The UABIAST is an in-line DC power adapter (bias-T) designed to inject 12V DC power directly into a coaxial antenna cable line. It powers active remote antennas (such as the UA874) or in-line RF amplifiers (such as the UA834) when connected to receivers or antenna splitters that do not supply built-in DC bias voltage.

What frequency range does the UABIAST support?

It features an ultra-wide RF operating bandwidth from 100 to 2000 MHz (100 MHz – 2 GHz). This extensive frequency response ensures transparency across all standard VHF and UHF wireless microphone bands, as well as 900 MHz and 1.2–1.8 GHz wireless spectrums.

Does the UABIAST introduce significant RF signal loss?

No, the unit is engineered with high-efficiency RF filtering to provide an essentially transparent signal path. It incurs minimal insertion loss (typically less than 1 dB across its operational spectrum), ensuring your RF reception quality and signal-to-noise ratio remain intact.

What type of physical connectors are used on the unit?

It is built with standard 50-ohm BNC female connectors for both the RF antenna input and the RF/receiver output, alongside a threaded, locking DC power receptacle. The locking DC barrel prevents accidental disconnection of the external power supply during live events or inside mobile racks.

How is the UABIAST powered?

The unit is powered via an external Shure PS24-series or compatible 12–15V DC inline power supply brick. It converts the incoming DC source and injects a stable 12V DC bias into the antenna-facing coaxial port.

Does the UABIAST send DC voltage back into the receiver?

No, the internal circuit incorporates a DC-blocking capacitor on the receiver/splitter-facing port. This ensures that DC bias current is directed solely toward the remote antenna/amplifier while completely isolating and protecting sensitive receiver front-end circuitry from unwanted DC voltage.

Can one UABIAST unit power multiple active antennas?

No, a single UABIAST unit supplies DC bias across a single coaxial run to power one antenna line. If you are operating a diversity wireless setup with two separate active antennas or two remote boosters, you will need two individual UABIAST units.

When is the UABIAST necessary in a wireless setup?

You need the UABIAST if you are running active antennas or line amplifiers into passive antenna splitters (such as the UA221) or entry-level receivers (like the BLX4R or SLX4) that do not provide on-board antenna bias power. If your system already uses an active distribution amplifier like the UA844+ or UA845, the UABIAST is generally not required because those units supply DC bias natively.

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