The PA421BX Antenna Combiner from Shure combines up to four PSM transmitters to a single antenna set. It can be used when multiple wireless systems are required for monitoring in sound reinforcement applications.

The PA421BX reduces rack clutter, optimizes RF management, and provides DC power to compatible IEM transmitters. LED indicators for signal presence and signal overload provide four input LED signals (green when active, off inactive). Also, a very quiet, temperature-sensitive fan keeps the unit cool.

Optimizes RF Management    Combines Up to Four PSM Transmitters    LED Indicators for Signal Presence    Daisy-Chain Up to 2 Combiners    Provides DC Power to IEM Transmitters    Reduces Rack Clutter

Combines up to four PSM transmitters to a single antenna set

• Improved intermodulation artifacts for cleaner RF environment
• Reduces rack clutter

Wideband operation 865 to 960 MHz

Daisy-chain up to 2 combiners with the expansion port

Provides DC power to compatible IEM transmitters

LED indications of signal presence, signal overload and current draw

Fan design significantly improves cooling and reduces ambient noise

Provides +15V bias on RF inputs to power antennas

Related Questions and Answers

Q: 1. Can this accomodate different sets like 2x BLX4R and 2x SLXD4 with varying frequencies ?

A: Yes, the Shure UA844+SWB UHF Wideband Antenna Distribution System can accommodate various receivers operating within the 470 to 960 MHz frequency range.

Q: 2. Is compatible with the SLX-D too?

A: Yes, the Shure UA844+SWB/LC Wideband Antenna Distribution System is compatible for use with Shure SLX-D receivers.

Q: 3. Can I split the RF output of this to 2 receivers using a BNC-TEE, or do I need an RF splitter?

A: You would be able to accomplish this using the UA221. https://www.bhphotovideo.com/c/product/1335931-REG/shure_ua221_rsma_reverse_sma_passive_antenna.html

Q: 4. The unit says this is good for 470-698 MHz. The headline says 470-900. Please, what is correct?

A: The Shure UA874WB Wideband Active Directional Antenna (470 to 900 MHz), BH # SHUA874WB, is designed for UHF signal reception extending from 470 to 900 MHz.This is also documented in the user guide. Please note the "WB" (Wide Band) designation on page 3/4: https://www.bhphotovideo.com/lit_files/1096710.pdf

Q: 5. Can I use IFBT4's with this unit? They transmit at 250mW. Wondering if this can attenuate or handle that kind of power.

A: The Lectrosonics M2C accepts a maximum input of 100 mW per port, so no, they would not be recommended for use together.

Q: 6. This is not only for BLX units, but for other models as well such as the QLX-D right?

A: The UA844+SWB/LC will support Support QLX-D, ULX, ULX-D, SLX, and BLX (BLX4R only) receivers.

Q: 7. how many microphones can connect too this ?

A: This antenna can receive signal from any number of active transmitters within range (based on the antenna's position and gain settings) that are transmitting between 470698 MHz. To clarify, this item's purpose in your wireless setup is to act as an extension of your receivers which, when properly placed and configured according to your application, can improve your transmitter(s) signal reception. However, it should be noted that your receivers are the devices that are actually connecting (or syncing) with your transmitters to interpret the captured signal of each active wireless microphone or bodypack. Thus, any limitations in number of transmitters you are able to use simultaneously would be based on the capabilities and coordination of your receivers rather than the number or type of antennas you are using.

Q: 8. Does this product come with BNC antenna cables or just the antennas?

A: Yes. see below: In the Box Shure UA844+SWB UHF Wideband Antenna Distribution System (470 to 960 MHz) PS45 Power Supply 4 x Locking DC Power Cables (for ULX4D, ULXP4) 4 x Non-Locking DC Power Cables (for QLXD4, SLX4, and BLX4R) 10 x 22" BNC Cables 2 x 6' BNC Cables 2 x Bulkhead Adapters Rackmount Hardware Kit Limited 2-Year Warranty 2 x Shure UA874 Active Directional Antenna 2-Year Limited Warranty

Q: 9. Description says this can handle up to five wireless receivers, but the picture of the back of the unit looks like there are only enough BNC connections for four receivers. Can someone clarify?

A: Michael F. That is correct bro. You can use up to 5 different wireless units. There are two outputs in the back A & B. Each output has 2 sets of out puts for FOUR(4) units, but if you notice next to each output bank youll find 1 cascade on each side equality to two total on the back. If you use those, now you have the capacity to use 5 units. Notice that if you do use the cascade you wont be able to connect multiple units if that was your intention. If youre only using one unit, you will be able to use 5 units using the cascade, if your intention is to use multiple units then 4 max is what you can use per unit. I hope this helps brotha. I use 2 of them for our church and I use 4 wireless units per unit as I have them linked together through cascade.

Q: 10. Are these made for permanent outdoor use?

A: No, the Shure UA874 Active Directional Antenna is not designed or rated to be installed outdoors. Shure recommends an antenna such as the Winegard Elite 7550 Amplified Outdoor/Attic HDTV Antenna (BH #WIWE7550A) as an alternative for use in permanent outdoor situations: https://bit.ly/3HWHJOA