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Changing Frequencies

Why does the ÃÛÑ¿´«Ã½ World Service change frequencies throughout the day? Engineer Andy Clarke explains how shortwave broadcasting works over long distances.

Also on the programme, why some people can roll their tongues and others can’t.

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31 minutes

ÃÛÑ¿´«Ã½ World Service Archive

This programme was restored as part of the World Service archive project