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3

4-TO-1 COMBINING FOR PSM TRANSMITTERS

Using the supplied BNC-BNC cables, connect the Antenna Output 

1. 

of each transmitter to the Antenna Inputs of the PA421SWB (See 

Figure 2).
Attach an antenna to the MAIN Out of PA421SWB. For wideband 

2. 

applications, use PA805SWB directional antenna (Figure 2).
Connect the PA421SWB to a power outlet using one of the supplied 

3. 

power cables. The PA421SWB contains a universal power supply to 

operate anywhere in the world.
If you have a Shure PSM system that has the same power input 

4. 

connectors as the PA421SWB power outputs, such as the PSM400, 

connect the PSM system to the PA421SWB via the supplied power 

cables (see figure 2). This replaces the need for an external power 

supply.

NOTE: The PA421SWB supplied power is 15 V and up to 660 mA.

®

PA80 5WB

Figure 2

NOTE: When the PA421SWB is powered on, the input signal 

indicators (1-4) on the front panel will illuminate if an active 

transmitter is connected to the corresponding input (1-4) on the 

back panel (Figure 2).

SPECIFICATIONS

RF Carrier Frequency Range

470-952 MHz

System Gain

+0/-5 dB

Input AC Line Voltage

100-240 Vac, 50/60 Hz

Maximum Input Line Power

120 W

Maximum Current Drain

0.42-1.0 Amperes

(Amperes = 100 VA/Input AC Line Voltage)

Maximum RF Input Power

24 dBm (250 mW) per channel

Input Signal Indicator  

Threshold

+4 dBm (2.5 mW), +2 dBm (1.6 mW) typical

Impedance

50 Ω nominal

Operating Temperature Range

0

°

 F (-18

°

 C) to +135

°

 F (+57

°

  C)

NOTE: 

Electrical safety approval is based on a maximum ambient 

temperature of 30°C.

Overall Dimensions

43.4 mm high x 398.8 mm wide x331.5 mm 

deep (1 11/16 in. H x 15 11/16 in. W x  

13 1/2 in. D)

Net Weight

4.53 Kg

(10 lbs unpackaged, without power and  

RF cables)

Input/Output Connector Type

BNC-type 4 input, 1 output ACTIVE

Power Outputs (4)

15 VDC, 660 mA each

FURNISHED ACCESSORIES

(4) 2 ft. Coaxial Cable (RG58C/U)

UA802

(4) 2 ft. Output Power Cable

95B8420

120 VAC Power Line Cord

95A8389

230 VAC Power Line Cord

95A8247

240 VAC Power Line Cord (U.K.)

95A8713

OPTIONAL ACCESSORIES

Wideband Unidirectional Antenna 
(470-952 MHz)

PA805SWB

10 ft. Coaxial Cable (RG-8X/U)

PA725

25 ft. Coaxial Cable (RG-8X/U)

UA825

50 ft. Coaxial Cable (RG-8X/U)

UA850

Wide Band Omnidirectional Antenna 

(470-1100 MHz)

UA860SWB

Helical Antenna

HA-8089 (480-900 MHz)

HA-8241(944-952 MHz)

AC Power

PSM Transmitters

50Ω BNC

CERTIFICATIONS

PA421SWB:  Certified  to  FCC  Part  74  (FCC  ID  No.  DD4PA421SWB). 

Certified  in  Canada  by  IC  to  RSS-123  AND  RSS-102  (Certification  No. 

IC:  616A-PA421SWB).  UL  LISTED  to  UL60065,  7th  Edition  and  cUL 

LISTED  to  CAN/CSA  E60065-00.  Meets  the  Essential  Requirements  of 

the European R&TTE Directive 99/5/EC, eligible to bear CE mark. Meets 

EMC requirements of EN 301 489 Parts 1 and 9 and is GS-Certified to EN 

EN60065, 7th Edition. Conforms to Australian EMC requirements, eleigible 

to bear C-Tick mark (N108). 

N108

LICENSING

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.
THIS RADIO EQUIPMENT IS INTENDED FOR USE IN PROFESSIONAL 

ENTERTAINMENT AND SIMILAR APPLICATIONS.

NOTE

  

THIS EQUIPMENT MAY BE CAPABLE OF OPERATING ON SOME 

FREQUENCIES NOT AUTHORIZED IN YOUR REGION. PLEASE 

CONTACT YOUR NATIONAL AUTHORITY TO OBTAIN INFORMATION 

ON AUTHORIZED FREQUENCIES FOR WIRELESS MICROPHONE 

PRODUCTS IN YOUR REGION.

Licensing: Note that a ministerial license to operate this equipment may 

be required in certain areas. Consult your national authority for possible 

requirements.

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