SOME free-to-air digital TV channels will soon be changing frequencies and will affect the Northern NSW Coast.

These moves are part of the national retune program and will free up broadcasting spectrum for new services such as mobile broadband.

For the Northern NSW Coast, the retune will occur on July 9.

Main suburbs affected include Coolangatta, Murwillumbah, Tweed Heads, Byron Bay, Nimbin, Ballina, Lismore, Casino, Yamba, Grafton, Coffs Harbour, Dorrigo, Nambucca Heads, South West Rocks, Kempsey and parts of Port Macquarie.

The best way for residents to find their retune day is by entering their address online into the 'Get retune info' box.

After the channels have changed, viewers will need to retune their digital TV, set-top box or digital TV recorder to find the channels that have moved. Retuning should not be done before July 9.

Retuning using the remote: For most systems press the 'menu' button. Look for settings such as 'channels' or 'auto-tuning' and follow the prompts to retune. A video and 3-step guide to retuning is available on the website.

The retune is scheduled to avoid evenings and weekends. There may be some temporary disruption to all TV services on retune day. Service outages on the days before and after the retune may also be necessary.

As free-to-air TV channels move to a new location on the broadcast spectrum, it is unlikely to change TV reception or coverage.