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A guide to the upcoming changes to wireless microphones

Important changes are happening to wireless microphones, of which the legal ramifications will take effect from 1 January 2015.  From the 1st of January 2015, a part of the UHF spectrum currently used for wireless microphones will be reserved for mobile voice and data applications.

The fact is changes are already taking place.  You may have noticed your wireless systems are suffering from interference not previously encountered.  This is because the TV stations are changing their broadcast frequencies (the restack).

Many community groups and small businesses use wireless audio transmitters—such as wireless microphones, public announcement systems, in-ear monitoring systems and musical pick-ups—for a range of purposes, including:

  • School assemblies and university lectures
  • Religious services
  • Theatre and live music performances
  • Auctions
  • Sporting events and gym classes
  • Museum and tourist activities
  • Ceremonies and conferences

What is Changing?

Australia is in transition from Analogue to Digital TV transmission.  Digital TV transmission is much more spectrally efficient than analogue, thus once transition is complete a significant portion of the spectrum currently allocated to TV broadcast (694-820MHz) will become “surplus to requirements”.  This surplus spectrum, referred to as the DIGITAL DIVIDEND, will be reallocated to Telecommunications service providers to enable next generation 4G mobile data services.  As a result, wireless audio devices must also vacate this part of the spectrum to free it up for the new services.

Additionally the TV services will be restacked into a block structure in the remaining 520-694MHz broadcast spectrum.  The allocation of these blocks will vary from location to location, making it imperative that operators of wireless audio devices research the new block allocations in order to coordinate operations

How will this affect me?

From the 1st of January 2015 the authorised frequency range for wireless audio devices will be reduced to 520-694MHz.  Older devices that operate above 694MHz in what is colloquially known as “the 700MHz band” must be restricted to operate below 694MHz ONLY.  Devices that are not capable of operating below 694MHz may no longer be used after the 1st January 2015.

What do I need to do?

Lemac sales consultants can help you navigate your way through the mysterious world of wireless mics and find the best solution for your needs.  All wireless products that Lemac sell are Digital Dividend ready! 

We can help you...

  • Do an audit of your current systems.  
  • What frequency range do they operate on now?  Are they capable of operating in the range 520-694MHz?
  • If they are in the new legal frequency range - do they experience interference problems? As the re-stack happens to your area in the coming months you may start to experience this.
  • Plan to transition out non-compliant products before January 2015.
  • Research TV block allocation and confirm products operating below 694MHz are compatible with the block allocation in locations of interest.  Lemac can assist in your choice of the best frequency range for your location and usage.  There is a new band exclusively for the use of wireless microphones in the 1790-1800 MHz range.

Contact Our Sales Team

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Lemac's Audio Specialists

If you'd prefer, you can contact one of our Audio Specialists directly via email.

Ross Boyer
Sydney Audio Specialist   

Ric Creaser
Melbourne Audio Specialist

Stuart Pointon
Brisbane Broadcast Specialist

What should I do with my old wireless equipment?

Ask Lemac about trade in deals.  Yes you can trade in any brand of redundant wireless system.

Planet Ark’s Recycling near you website can identify your nearest electronic waste disposal service.

For further information and useful links:

ACMA Wireless Mics page

Subscribe to the ACMA free monthly e-bulletin, visit the wireless microphones hub on the ACMA website or send us your questions to freqplan@acma.gov.au.


02 9438 4488


03 9429 8588


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