WARNING: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.
Shure antenna combiners actively combine RF outputs from multiple wireless IEM transmitters to a single antenna, improving RF performance and conserving rack space.
Shure antenna combiners for Shure IEM wireless personal monitoring systems are available in four-channel and eight-channel rackmountable configurations.
|Model||Frequency Range||RF Inputs||DC Power Outlets|
The antenna combiners are available in two frequency ranges. The RF inputs allow up to four or eight (model dependent) IEM systems to share a single antenna. The DC power outlets and supplied power cables allow you to distribute power to up to four compatible IEM systems without requiring external power supplies.
*(4) 2 ft. DC power output cables are included with four-channel combiners only.
**The four-channel combiners come with (4) 22 in. BNC cables. The eight-channel combiners come with (8) 22 in. BNC cables.
① Main Out Antenna Connector
|Use the antenna supplied with the transmitter, or any other Shure passive antenna that matches the RF operating range.|
② LED Indicators
|The LED indicators on the PA421B and PA421BX display RF signal and DC current draw. The LED indicators on the PA821B and PA821BX display RF signal only. See the section on LED Indicators for more information.|
③ Fan Vents
|For system cooling.|
④ Expansion Port
|Connect an IEM transmitter or another combiner to share a single antenna. See the Using Multiple Antenna Combiners with a Single Antenna section for connection information.|
⑤ Power LED
Green: Combiner is powered on
Red: Indicates fan fault
Green/red flashing: Maximum temperature has been exceeded
Warning! If maximum temperature has been exceeded, attention is required. Allow the combiner to cool. If condition persists, send the unit to Shure Service and Repair.
⑥ Power Switch
① Power Input
|Connects unit to AC power.|
② Exhaust Air Vents
|For system cooling.|
③ DC Power Outputs
|Available on the PA421B and PA421BX models for powering compatible transmitters|
④ RF Inputs
PA421B: Connect up to 4 IEM transmitter outputs
PA821B: Connect up to 8 IEM transmitter outputs
Warning! Opening the unit can result in permanent damage and may result in an undesirable change in performance. There are no user-serviceable parts inside.
The top 4 RF LED indicators display input signal presence.
The PA421B and PA421BX combiners supply 15 V at up to 660 mA to each DC output. These may be used to power compatible Shure IEM transmitters.
The bottom 4 LEDs indicate current draw for each DC output.
PA421B and PA421BX
The PA821B and PA821BX antenna combiners allow up to 8 transmitters to share a single antenna. RF LED indicators display input signal presence.
PA821B and PA821BX
Note: A minimum of RF signal is required to activate the channel. See Specifications page for more information.
Note: Use external power supplies or an optional power distribution cable to supply power to additional transmitters. The PA821B and PA821BX combiners do not supply DC power.
Four PSM900 transmitters using a single antenna.
Use the passive expansion port to share a single antenna with multiple combiners or transmitters.
43 x 401 x 365 mm (1.7 x 15.8 x 14.4 in.), H x W x D
|PA421B, PA421BX||4.3 kg (9.5 lbs)|
|PA821B, PA821BX||4.8 kg (10.5 lbs)|
-18°C (0°F) to 63°C (145°F)
100 to 240 V AC, 50-60 Hz
|PA421B, PA421BX (referenced at 100 V AC)||1.09 A (109 VA)|
|PA821B, PA821BX (referenced at 100 V AC)||1.59 A (159 VA)|
|PA421B, PA421BX||98 W max.|
|PA821B, PA821BX||143 W max.|
0 dB (±2 dB)
up to +20 dBm max., protected up to +24 dBm
15 V DC
660 mA max.
*PA421B and PA421BX only
**PA821B and PA821BX only
***IEC power cord comes standard. Some regions come with multiple cords.
Shure offers antenna cables ranging from 6 to 100 feet.
The Shure Wireless Accessory Wizard is a resource to help determine the correct RF accessories for your wireless system. You provide basic information about your setup and receive item recommendations and connection diagrams.
Go to http://www.shure.com/wirelessaccessorywizard to access the Wireless Accessory Wizard.
Meets essential requirements of the following European Directives:
Note: Please follow your regional recycling scheme for batteries and electronic waste
Meets requirements of the following standards:
Conforms to electrical safety requirements based on IEC 60065.
Certified under FCC Part 74.
Certified by IC in Canada under RSS-123.
FCC ID: DD4PA421B. IC: 616A-PA421B.
FCC ID: DD4PA421BX. IC: 616A-PA421BX.
FCC ID: DD4PA821B. IC: 616A-PA821B.
FCC ID: DD4PA821BX. IC: 616A-PA821BX.
THIS RADIO EQUIPMENT IS INTENDED FOR USE IN PROFESSIONAL ENTERTAINMENT AND SIMILAR APPLICATIONS.
Federal Communications Commission RF Exposure Notice:
Antennas used for the purpose of radiating signals are limited to a maximum gain of 14 dBi. Each antenna must be positioned to observe minimum separation requirements from all users and bystanders. The following guidelines should be used when considering separation distances.
Antennas must be placed such that, under normal conditions, personnel cannot come within 72 cm (~2.5 ft.) from any antenna. Adhering to this minimum separation will ensure that the employee or bystander cannot exceed RF exposures beyond the maximum permissible limit as defined by 47 CFR 1.1310, i.e., limits for General Population/Uncontrolled Exposure.
This device complies with Industry Canada licence-exempt RSS standard(s). Operation of this device is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1) l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en compromettre le fonctionnement.
Note: EMC conformance testing is based on the use of supplied and recommended cable types. The use of other cable types may degrade EMC performance.
The CE Declaration of Conformity can be obtained from Shure Incorporated or any of its European representatives. For contact information please visit www.shure.com
The CE Declaration of Conformity can be obtained from: www.shure.com/europe/compliance
Authorized European representative:
Shure Europe GmbH
Headquarters Europe, Middle East & Africa
Department: EMEA Approval
75031 Eppingen, Germany
Phone: 49-7262-92 49 0
Fax: 49-7262-92 49 11 4
Licensing: A ministerial license to operate this equipment may be required in certain areas. Consult your national authority for possible requirements. Changes or modifications not expressly approved by Shure Incorporated could void your authority to operate the equipment. Licensing of Shure wireless microphone equipment is the user’s responsibility, and licensability depends on the user’s classification and application, and on the selected frequency. Shure strongly urges the user to contact the appropriate telecommunications authority concerning proper licensing, and before choosing and ordering frequencies.