400 MHz Transitions

How we can help

You may be aware, or have recently been notified by the Australian Communications and Media Authority (the ACMA), that your 400 MHz band licences need to comply with certain transition requirements, particularly if your licences are due to expire in the coming months. We are here to help and guide you through this process. We can carry out the necessary process to assign a new frequency for your radiocommunications system, and submit all the necessary paperwork to the ACMA.

If you are unsure, you can ask us about whether your system needs to comply with any transition requirements, or check the ACMA's online tool.

In certain situations, you may be unable to meet the transition deadlines, but are eligible to be granted an exception from the ACMA. We can work with you to develop an appropriate proposal for an extension of the deadline for a maximum of 12 months.


The 400 MHz band (frequency ranges 403-430 MHz and 450-520 MHz) comprise some of the most heavily-utilised spectrum in Australia. It is currently used primarily for land mobile, fixed point-to-point and fixed point-to-multipoint services, but also for radiolocation and amateur services, and the level of congestion in the band has been increasing for some time.

A comprehensive review of the band commenced in 2008, culminating in a number of transition requirements for 400 MHz band users from 2010, including:

  • measures to reduce congestion, for example, reduction of channel bandwidths and power
  • a restructure of 450-470 MHz to accommodate a 10 MHz duplex split
  • requirements for non-government users to migrate out of spectrum identified for harmonised government use (and vice versa).