Shure UA845US Wideband UHF 500-900 MHz 15W Antenna Distribution System

The UA845US is a 5-way active antenna and power distribution system engineered for professional multi-channel UHF wireless microphone setups. It allows a single pair of diversity antennas to feed up to four (or five) wireless receivers while simultaneously distributing clean DC power to eliminate multiple wall-wart adapters in equipment racks.

The UA845US is tuned to operate across the wideband UHF carrier frequency range of 500 to 900 MHz. This broad passband accommodates a wide array of legacy and modern UHF wireless microphone systems across multiple TV and frequency bands without filtering out necessary spectrum.

A single unit provides four primary pairs of RF output ports (Channels A and B) to feed four diversity receivers. In addition, it features a pair of dedicated Cascade BNC output ports, which can either feed a fifth wireless receiver or link to a second UA845 unit to expand the system for larger receiver counts.

Yes, it incorporates low-noise internal RF amplification that actively compensates for insertion loss incurred when splitting incoming antenna signals. It provides typical active gain of +3 dB (ranging from 0 dB to +3.5 dB) on Output Ports 1–4, and +1 dB (typical) on the Cascade outputs, ensuring receivers receive optimal signal strength.

The rear panel provides four dedicated DC output jacks that deliver clean 12V DC power directly to compatible wireless receivers (such as Shure UC4 or compatible half-rack receivers). It also features an unswitched AC power pass-through output (IEC) for daisy-chaining main AC power to compatible full-chassis receivers (like the UR4 series) from a single wall outlet.

Yes, the Antenna In ports (Channels A and B) provide DC bias voltage on the center pin of the BNC connector. This allows the unit to directly power remote active directional antennas (like the UA870 or UA874) or in-line RF boosters (like the UA834) down the coaxial cable without needing external bias-T injectors like the UABIAST.

Yes, the UA845US includes front-panel BNC bulkhead pass-through holes and supplied jumper cables. This allows standard 1/2-wave whip antennas to be brought to the front of the rack, preventing RF attenuation that occurs when antennas remain trapped inside metal rack enclosures.

The unit is housed in a rugged, full-metal 1U 19-inch rack-mount chassis with an integrated internal power supply operating from 100 to 240V AC. It consumes approximately 15W of AC power on its own (scaling up to roughly 55W maximum when supplying DC power to four connected receivers).