Automatic Changeover Unit

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MXACU Product Information


The MXACU Automatic Changeover Unit (ACU) is designed to allow connection of two identical MX800 base stations, activating only one of them at a time in active/standby configurations. It automatically monitors and tests for fault conditions and switches operation to the healthiest base station should a fault be detected.



Rack size 2RU Case
Physical Size 89mm high, 360mm deep, 483mm wide
Supply Voltage 13.8V DC 20%
Power Consumption Base A Selected <80mA
Base B Selected <350mA
Operating Temperature -10 to +60 C
LED Indicators Active, Fault, Power, Status
Coax Relay Insertion Loss < 0.2dB @ 500Mhz
Coax Relay VSWR < 1.03 @ 500Mhz
Coax Relay Isolation 65dB @ 500Mhz
Coax Relay power rating 500W @ 500Mhz
Typical Changeover time Approximately 3 seconds
Weight < 4 Kg



  • T39 - RX RF Passive Splitter, N-Type input & 2x BNC outputs. Connects 2 receivers to one antenna.
  • T40 - Internal Ethernet interface for remote diagnostics
  • T42 - TX Antenna changeover RF Relay (for one TX antenna)
  • T44 - Simplex mode operation with ACU Simplex RF Relay.
    Simplex T06 option not reqd in MX800 unless compatability is reqd.
    This option not reqd if using T06 options (however some loss in functionality may result).
  • DTMF Remote control operation
  • PSTN Modem


MXACUNET - Remote Diagnostic & Control Software

MXACUNET is an application in which you can diagnose and control single or multiple MXACU, by working in conjunction with T40 Option board.

MXACUNET features:

  • Real Time MXACU Diagnostic through Ethernet port.
  • Real Time MXACU Remote Control through Ethernet port.
  • Alarm Logging.
  • Coming Soon SMTP server - email client on fault conditions.

The protocol used to communicate through the Ethernet is UDP/IP to minimize communication overhead.

There are two main parts of MXACUNET:

· Main Window , where user/operator can create list of MXACUs, set access level and start/stop Remote Control and Diagnostics communications.

· Remote Control and Diagnostics window, which displays diagnostic result from each MXACU and the radios connected to it. In addition, it has some buttons for MXACU Remote Control features.

MXACUNET- Remote diagnostic & control software.
(T40 option required)

System Requirements

    Supported Operating Systems:
    Windows Server 2003;Windows Server 2008; Windows Vista; Windows XP
    Processor: 400 MHz Pentium processor or equivalent (Minimum); 1GHz Pentiumprocessor or equivalent (Recommended)
    RAM:96 MB (Minimum); 256 MB (Recommended)
    Hard Disk: Up to 500 MB of available space may be required
    CD or DVD Drive: Not required

    Display: 800 x 600, 256 colors (Minimum); 1024 x 768 high color, 32-bit (Recommended)

    MACU: Firmware ≥ V1.2.0


  • Not all items and features initially available.
  • Due to ongoing development we reserve the right to alter specifications without notice.


Reliable Radio Communications. When You Need It Most.                        2013 Spectra Engineering Pty Ltd