GYM instructors and clerics could struggle to get their message across when the federal government sells the rights to broadcast frequencies used by analogue television, and wireless microphones.
In April the government will auction a spectrum in the 700 megahertz bandwidth freed by the switch to digital television.
Telecommunications companies Optus, Telstra and Vodafone have registered their interest in bidding for frequencies which will allow them to expand their wireless broadband services for fourth-generation mobile phones.
But shadow communications minister Malcolm Turnbull says the Broadcasting Legislation Amendment (Digital Dividend) Bill needs to be amended so popular wireless microphone technology does not become obsolete.
He says there are 120,000 to 150,000 wireless microphone units in Australia that could be affected.
The takeover of the bandwidth is not scheduled until 2015, but there have been calls for buyers to be able to use it beforehand.
"You can imagine the consequences are going to be shocking. This has the potential of interfering with tens of thousands of businesses."
He called on the government to introduce an education campaign for users and sellers of the technology so they could plan for 2015.
The Australian Communications and Media Authority website says planning is at an early stage and updates will be provided as they become available.
Speaking on the bill in parliament on Monday, Mr Turnbull was also critical of the government's auction reserve price of $1.36 per megahertz per head of the population, double what was achieved in a recent similar sale in the United Kingdom.
Mr Turnbull said the government should lower the reserve and stop subsidising the NBN.
"They are subsidising the form of broadband that has the smaller contribution to productivity and gouging the medium of broadband that has the maximum benefit," he said.
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