AKG PSU4000 Power Supply Unit for UHF Antenna Distributors

AKG PSU4000: The DC Rail Behind an Antenna Distribution Rack

The AKG PSU4000 is a central power supply unit that provides three high-current 12 V DC outputs to feed the power to as many as three PS4000 W antenna distributors. Its entire role is infrastructure, sitting behind the visible parts of a wireless system and supplying the direct current that antenna distribution equipment cannot generate for itself. AKG documents the unit in the accessory sections of both the WMS470 and WMS4500 platform literature, always in the same terms and always in the same relationship to those distributors, which is a strong indication of how narrowly it is intended to be used. Because each distributor it powers passes the radio signal of one antenna pair to as many as five receivers, one supply can stand behind fifteen receiver channels fed from a single antenna position. Nobody buys this part for its own sake, and that is precisely why it belongs on a rack drawing rather than in a wish list.

Three Outputs, and Exactly What Each One Feeds

Each of the three outputs is intended for one PS4000 W antenna distributor, which AKG describes as the component that feeds the radio signal from a pair of antennas to as many as five receivers. Antenna distribution exists because receivers should not each have their own pair of antennas: in a rack of six or ten receivers that would mean twelve or twenty aerials competing for space and mutually interfering, so instead one well-sited antenna pair is split electronically and shared, with the distributor doing the splitting and making up the loss. Those distributors are active electronics and therefore need a supply, and providing it from a single high-current unit rather than three separate adapters is the design intent here. A rack built this way has one power connection to check when an antenna path falls silent, which is a meaningfully faster diagnosis than tracing three anonymous adapters behind a loom of coaxial cable.

Why a Fixed Installation Wants Its DC Centralised

Centralising direct current is a habit of the installed-systems world rather than a preference, and it comes from three practical pressures. Racks in fixed installations are often monitored, fused and backed up as a whole, so a single supply can be metered, protected and put on a battery-backed circuit in a way that a handful of individual adapters cannot; adding another mains block to a crowded rack also consumes the outlets and the physical space that were carefully allocated at design time. Integrators who look after dozens of racks tend to standardise on one supply part number for a third reason, which is that a failure anywhere in an estate is then fixed from one shelf rather than from a drawer of assorted adapters nobody can identify. Council chambers, courtrooms, university lecture theatres, broadcast facilities and large worship campuses are typically wired exactly this way, and antenna distribution is one of the loads that benefits most.

What AKG Publishes About This Part, and What It Does Not

Published information on the PSU4000 is deliberately reported here in full rather than filled out, because the manufacturer says little and inventing the rest would be worse than leaving gaps. Confirmed on two separate AKG platform documents are the three high-current 12 V DC outputs, the intended load of three PS4000 W antenna distributors, and the position of the unit within the analog UHF antenna infrastructure for the WMS470 and WMS4500 systems; not published anywhere reachable are the current rating per output, the mains input range, the rack height, the connector types or the housing. Equally unresolved is what the trailing designation on this specific part number denotes, since AKG does not document it, and although the same trailing designation on the related APS4 antenna power splitter family marks a configuration supplied without a power supply, no manufacturer document extends that convention to a unit that is itself a power supply. Anyone specifying this part should therefore confirm the supplied mains cord configuration with AKG support before ordering, exactly as they would confirm rack space and current draw from the drawing.