Shure PA421B User manual

PA421B PA821B
Antenna Combiner
PA421B PA821B Antenna Combiner user guide.
Version: 1.2 (2022-F)

Shure Incorporated
2/15
Table of Contents
PA421B PA821B Antenna Combiner 3
General Description 3
Features 3
Model Variations 3
Included Components 3
Front Panels 4
Rear Panels 4
Installation 5
Rack Mount Instructions 5
LED Indicators 5
PA421B and PA421BX 6
PA821B and PA821BX 6
Using Multiple Transmitters with a Single Antenna 6
Using Multiple Antenna Combiners with a Single Anten
na 8
Specifications 9
RF Frequency Range 11
Accessories 11
Furnished Accessories 11
Optional Accessories 12
Wireless Accessory Wizard 12
IMPORTANT SAFETY INSTRUCTIONS 12
Information to the user 13
LICENSING INFORMATION 14
Certifications 14

Shure Incorporated
3/15
•
•
•
•
•
PA421B PA821B 
Antenna Combiner
General Description
Shure antenna combiners actively combine RF outputs from multiple wireless IEM transmitters to a single antenna, improving
RF performance and conserving rack space.
Features
Reduction of intermodulation artifacts for cleaner RF environment
Wideband operation (470-865 MHz or 865-960 MHz)
Daisy-chain up to 2 combiners with the expansion port.
Provide DC power to compatible IEM transmitters.
LED indications of signal presence, signal overload and current draw
Model Variations
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
PA421B 470-865 MHz 4 4
PA421BX 865-960 MHz 4 4
PA821B 470-865 MHz 8 0
PA821BX 865-960 MHz 8 0
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.
Included Components

Shure Incorporated
4/15
*(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.
Front Panels
① Main Out Antenna Con
nector
Use the antenna supplied with the transmitter, or any other Shure passive antenna that
matches the RF operating range.
②LED 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.
③Fan Vents For system cooling.
④Expansion 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.
⑤Power 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com
biner to cool. If condition persists, send the unit to Shure Service and Repair.
⑥Power Switch
Rear Panels

Shure Incorporated
5/15
•
•
•
•
•
①Power Input Connects unit to AC power.
②Exhaust Air Vents For system cooling.
③DC Power Outputs Available on the PA421B and PA421BX models for powering compatible transmitters
④RF Inputs PA421B: Connect up to 4 IEM transmitter outputs
PA821B: Connect up to 8 IEM transmitter outputs
Installation
Rack Mount Instructions
If installed in a closed or multi-unit rack assembly, the operating ambient temperature of the rack environment may be
greater than room ambient. Keep the rack environment temperature at or below the maximum ambient temperature (Tma)
specified by the manufacturer of the installed equipment.
Provide the proper amount of air flow inside the rack as required for safe operation of the equipment.
Do not create a hazardous condition by mounting the equipment in the rack with an uneven mechanical load.
When connecting the equipment to the supply circuit, consider the effect that overloading of the circuits might have on
over-current protection and supply wiring. Consider all equipment nameplate ratings when addressing this concern.
Maintain reliable earthing of rack-mounted equipment. Give particular attention to indirect supply connections to the
branch circuit (e.g., power strips).

Shure Incorporated
6/15
•
•
•
•
•
•
•
•
•
LED Indicators
PA421B and PA421BX
The top 4 RF LED indicators display input signal presence.
Green = active
Red = RF input signal overload
Off = inactive
The bottom 4 LEDs indicate current draw for each DC output.
Green = Device is powered on.
Red = Current overload.
Off = inactive
PA421B and PA421BX
PA821B and PA821BX
The PA821B and PA821BX antenna combiners allow up to 8 transmitters to share a single antenna. RF LED indicators display
input signal presence.
Green = active
Red = RF input signal overload
Off = inactive
PA821B and PA821BX
Note: A minimum of RF signal is required to activate the channel. See Specifications page for more information.

Shure Incorporated
7/15
Using Multiple Transmitters with a Single Antenna
PA421B

Shure Incorporated
8/15
PA821B
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.

Shure Incorporated
9/15
Using Multiple Antenna Combiners with a Single Antenna
Specifications
Dimensions
43x401x365mm(1.7x15.8x14.4in.),HxWxD
Weight
PA421B, PA421BX 4.3kg(9.5lbs)
PA821B, PA821BX 4.8kg(10.5lbs)
Operating Temperature Range
-18°C (0°F) to 63°C (145°F)
Power Requirements
100to240VAC,5060Hz
Current Drain
PA421B, PA421BX (referenced at 100 V AC) 1.09 A (109 VA)
PA821B, PA821BX (referenced at 100 V AC) 1.59 A (159 VA)

Shure Incorporated
10/15
Power Consumption
PA421B, PA421BX 98 W max.
PA821B, PA821BX 143 W max.
RF Input
Connector Type
BNC
Configuration
Active
Impedance
50Ω
RF Gain
0dB(±2dB)
RF Input Normal Operating Range
upto+20dBmmax.,protectedupto+24dBm
LED Indicator Minimum Detection Threshold to Activate Channel
2.5dBm
LED Indicator Overload Threshold
>24dBm
Main Output
Connector Type
BNC
Impedance
50Ω
Expansion Port
Connector Type
BNC
Configuration
Passive
Impedance
50Ω

Shure Incorporated
11/15
•
•
•
•
•
Insertion Loss
<4dB
DC Outputs (PA421B, PA421BX)
Output Voltage
15 V DC
Output Current
per output
660mAmax.
Output Power
per output
9.9 W
LED Indicator Minimum Detection Threshold
85mA
LED Overcurrent Indicator
>660mA
RF Frequency Range
Band Frequency Range
PA421B 470-865MHz
PA421BX 865-960MHz
PA821B 470-865MHz
PA821BX 865-960MHz
Accessories
Furnished Accessories
(4) 22 in. BNC cables*
(8) 22 in. BNC cables**
(1) 11 in. BNC jumper cable
IEC power cord***
(4) 2 ft. DC output power jumper cables*
*PA421B and PA421BX only
**PA821B and PA821BX only

Shure Incorporated
12/15
•
•
•
•
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
***IEC power cord comes standard. Some regions come with multiple cords.
Optional Accessories
Passive Directional Antenna
Passive Omnidirectional Antenna
Helical Antenna
BNC-terminated Coaxial Cables
Antenna Cables from Shure
Shure offers antenna cables ranging from 6 to 100 feet.
Wireless Accessory Wizard
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 https://www.shure.com/en-US/support/tools/wireless-accessory-wizard to access the Wireless Accessory Wizard.
IMPORTANT SAFETY INSTRUCTIONS
READ these instructions.
KEEP these instructions.
HEED all warnings.
FOLLOW all instructions.
DO NOT use this apparatus near water.
CLEAN ONLY with dry cloth.
DO NOT block any ventilation openings. Allow sufficient distances for adequate ventilation and install in accordance
withthemanufacturer’sinstructions.
DONOTinstallnearanyheatsourcessuchasopenflames,radiators,heatregisters,stoves,orotherapparatus(in
cluding amplifiers) that produce heat. Do not place any open flame sources on the product.
DO NOT defeat the safety purpose of the polarized or grounding type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug has two blades and a third grounding prong. The wider blade or the third
prongareprovidedforyoursafety.Iftheprovidedplugdoesnotfitintoyouroutlet,consultanelectricianforreplace
ment of the obsolete outlet.
PROTECT the power cord from being walked on or pinched, particularly at plugs, convenience receptacles, and the
point where they exit from the apparatus.
ONLY USE attachments/accessories specified by the manufacturer.
USE only with a cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a
cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
UNPLUG this apparatus during lightning storms or when unused for long periods of time.

Shure Incorporated
13/15
14.
15.
16.
17.
18.
19.
20.
21.
REFER all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way, such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus,
the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
DO NOT expose the apparatus to dripping and splashing. DO NOT put objects filled with liquids, such as vases, on the
apparatus.
The MAINS plug or an appliance coupler shall remain readily operable.
The airborne noise of the Apparatus does not exceed 70dB (A).
ApparatuswithCLASSIconstructionshallbeconnectedtoaMAINSsocketoutletwithaprotectiveearthingconnec
tion.
To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
Do not attempt to modify this product. Doing so could result in personal injury and/or product failure.
Operate this product within its specified operating temperature range.
This symbol indicates that dangerous voltage constituting a risk of electric shock is present within this unit.
Thissymbolindicatesthatthereareimportantoperatingandmaintenanceinstructionsintheliteratureaccom
panying this unit.
Waste Electrical and Electronic Equipment (WEEE) Directive
In the European Union and the United Kingdom, this label indicates that this product should not be disposed of with household
waste. It should be deposited at an appropriate facility to enable recovery and recycling.
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.
WARNING: Voltagesinthisequipmentarehazardoustolife.Nouserserviceablepartsinside.Referallservicingtoqualifiedservicepersonnel.Thesafetycer
tifications do not apply when the operating voltage is changed from the factory setting.
Note: Use only with the included power supply or a Shure-approved equivalent.
Information to the user
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC
Rules. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance
with the manufacturer's instruction manual, may cause interference with radio and television reception.
Notice: The FCC regulations provide that changes or modifications not expressly approved by Shure Incorporated could void
your authority to operate this equipment.

Shure Incorporated
14/15
•
•
•
•
1.
2.
Theselimitsaredesignedtoprovidereasonableprotectionagainstharmfulinterferenceinaresidentialinstallation.Thisequip
ment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a
particularinstallation.Ifthisequipmentdoescauseharmfulinterferencetoradioortelevisionreception,whichcanbedeter
minedbyturningtheequipmentoffandon,theuserisencouragedtotrytocorrecttheinterferencebyoneormoreofthefol
lowing measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause undesired operation.
The equipment is intended to be used in professional audio applications.
For information regarding responsible party and other matters relating to FCC compliance, please contact Shure Incorporated,
5800 W. Touhy Avenue, Niles, Illinois 60714-4608 U.S.A. shure.com/contact
Registration, Evaluation, Authorization of Chemicals (REACH) Directive
REACH (Registration, Evaluation, Authorization of Chemicals) is the European Union (EU) and the United Kingdom (UK)
chemical substances regulatory framework. Information on substances of very high concern contained in Shure products in a
concentration above 0.1% weight over weight (w/w) is available upon request.
Please consider the environment, electric products and packaging are part of regional recycling schemes and do not belong to
regular household waste.
LICENSING INFORMATION
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de
pends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.
Certifications
Conforms to electrical safety requirements based on IEC/EN 62368-1.
Certified under FCC Part 74.
Certified by ISED 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 Class B digital apparatus complies with Canadian ICES-003. Cet appareil numérique de la classe B est conforme à la
norme NMB-003 du Canada.
Notice: The Industry Canada regulations provide that changes or modifications not expressly approved by Shure Inc. could
void your authority to operate this equipment.

Shure Incorporated
15/15
1.
2.
1.
2.
This product meets the applicable Innovation, Science and Economic Development Canada technical specifications. Certified
by ISED in Canada under RSS-247 and RSS-GEN.
Thisdevicecontainslicenceexempttransmitter(s)/receiver(s)thatcomplywithInnovation,ScienceandEconomicDevelop
mentCanada’slicenceexemptRSS(s).Operationissubjecttothefollowingtwoconditions:
This device may not cause interference.
This device must accept any interference, including interference that may cause undesired operation of the device.
L’émetteur/récepteurexemptdelicencecontenudansleprésentappareilestconformeauxCNRd’Innovation,Scienceset
DéveloppementéconomiqueCanadaapplicablesauxappareilsradioexemptsdelicence.L’exploitationestautoriséeauxdeux
conditions suivantes :
L’appareilnedoitpasproduiredebrouillage;
L’appareildoitacceptertoutbrouillageradioélectriquesubi,mêmesilebrouillageestsusceptibled’encompromettrele
fonctionnement.
CE Notice: Hereby, Shure Incorporated declares that this product with CE Marking has been determined to be in compliance
with European Union requirements. The full text of the EU declaration of conformity is available at the following site: https://
www.shure.com/en-EU/support/declarations-of-conformity.
Authorized European importer:
Shure Europe GmbH
Department: Global Compliance
Jakob-Dieffenbacher-Str. 12
75031 Eppingen, Germany
Phone: [phone]
Fax: [phone]
Email: [email protected]
UKCA Notice: Hereby,ShureIncorporateddeclaresthatthisproductwithUKCAMarkinghasbeendeterminedtobeincompli
ance with UKCA requirements. The full text of the UK declaration of conformity is available at the following site: https://
www.shure.com/en-GB/support/declarations-of-conformity.
UK Importer / UK Rep.
Shure UK Limited
Unit 2, The IO Centre, Lea Road,
Waltham Abbey, Essex, EN9 1 AS,
UK