The Australian Communications and Media Authority (ACMA) have confirmed that the frequency band 695 - 820 MHz has been auctioned off and will no longer be available as of 30 September 2014. All radio microphones within the frequency range 695 – 820 MHz require replacement prior to the deadline. If this is not done the microphones using these ranges will run the risk of receiving interference from broadcasts on those frequencies and will breach licensing agreements with the owners of the sold radio spectrum.

Microphones within the range 520 – 694 can continue to be used.

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More information can be found here.