Contents

Table of Contents
PA421B PA821B Antenna Combiner
IMPORTANT SAFETY INSTRUCTIONS
General Description
- Features
- Model Variations
- Included Components
Front Panels
- Rear Panels
Installation
- Rack Mount Instructions
LED Indicators
- PA421B and PA421BX
- PA821B and PA821BX
Using Multiple Transmitters with a Single Antenna
Using Multiple Antenna Combiners with a Single Antenna
Using Multiple Antenna Combiners with a Single Antenna
Specifications
- Dimensions
- Weight
- Operating Temperature Range
- Power Requirements
- Current Drain
- Power Consumption
- RF Input
- Connector Type
- Configuration
- Impedance
- RF Gain
- RF Input Normal Operating Range
- LED Indicator Minimum Detection Threshold to Activate Channel
- LED Indicator Overload Threshold
- Main Output
- Connector Type
- Impedance
- Expansion Port
- Connector Type
- Configuration
- Impedance
- Insertion Loss
- DC Outputs (PA421B, PA421BX)
- Output Voltage
- Output Current
- Output Power
- LED Indicator Minimum Detection Threshold
- LED Overcurrent Indicator
RF Frequency Range
Accessories
- Furnished Accessories
- Optional Accessories
  - Antenna Cables from Shure
Wireless Accessory Wizard
Information to the user
- LICENSING INFORMATION
Certifications
- CE Notice:
- UKCA Notice:

Shure PA421B User Guide

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Shure PA421B Antenna Specification

The Shure PA421B Antenna Combiner is designed to optimize the performance of wireless microphone systems by streamlining RF signal management. This device operates within a frequency range of 470 to 865 MHz, making it compatible with a wide range of wireless equipment. It effectively combines up to four wireless system antenna outputs into a single antenna, reducing the number of antennas required and minimizing signal dropout risk. The PA421B is engineered with advanced filtering technology to enhance signal clarity and reduce interference from external sources. It supports RF distribution for up to four receivers, ensuring efficient and reliable operation in complex RF environments. The unit features front-panel LED indicators for active channel status and power, offering easy monitoring and diagnostics. The robust metal chassis design ensures durability and longevity, while the compact form factor allows for convenient rack-mounting, suitable for professional audio setups. The antenna combiner is powered through an internal power supply, featuring a detachable IEC power cord for flexibility and ease of installation. The Shure PA421B is equipped with BNC connectors for seamless integration with existing audio equipment, ensuring compatibility and quick setup. This makes it an ideal solution for live performances, broadcast environments, and large-scale events where reliable wireless audio transmission is critical.

Shure PA421B Antenna F.A.Q.

How do I properly set up the Shure PA421B Antenna?

To set up the Shure PA421B Antenna, ensure it is connected between your wireless receiver and antennas. Use the supplied RF cables to connect the RF outputs of the PA421B to the RF inputs of your receiver. Power the unit using the included AC adapter and position the antennas in a V-shape for optimal reception.

What should I do if the Shure PA421B Antenna is not powering on?

First, check that the power supply is connected securely to the PA421B and the power outlet. Verify that the outlet is working by testing it with another device. If the problem persists, inspect the power adapter for damage and replace if necessary.

How can I troubleshoot signal dropouts with the PA421B Antenna?

Ensure line-of-sight between the antennas and transmitters. Check cable connections for any loose or damaged cables. Adjust the antennas to be at least one wavelength apart and positioned optimally. Additionally, scan for and avoid frequency interference from other devices.

What maintenance is required for the Shure PA421B Antenna?

Regularly check and tighten all cable connections. Clean the antennas and connectors with a dry, soft cloth to remove dust. Inspect for any physical damage and replace components as necessary. Store in a dry, cool place when not in use.

How can I extend the range of my Shure PA421B Antenna?

To extend the range, ensure the antennas are placed as high as possible and clear from obstructions. Consider using directional antennas for focused coverage or adding an antenna distribution system to cover larger areas.

Can I use the Shure PA421B Antenna with multiple receivers?

Yes, the PA421B can be used with multiple receivers by connecting them through an antenna distribution system. This setup allows sharing of antennas among several receivers, maintaining signal integrity.

What is the maximum number of antennas I can connect to the PA421B?

The Shure PA421B is designed to work with two antennas. Ensure each antenna is connected to the respective input to maintain optimal performance.

What should I do if I experience interference with the PA421B Antenna?

Perform a frequency scan to identify and avoid channels with interference. Re-position the antennas to reduce interference and ensure they are not near large metal objects or electronic devices that could cause signal disruption.

How do I update the firmware of the Shure PA421B Antenna?

The PA421B does not require firmware updates as it is a passive antenna splitter. Ensure all connected devices have updated firmware for optimal performance.

Can the PA421B Antenna be used outdoors?

The Shure PA421B is designed for indoor use. If outdoor use is necessary, protect the unit from moisture and extreme temperatures and ensure it is well-ventilated to prevent overheating.