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1999-02-05
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4.7.95
Mobile phones put star secrets at risk
By Bob Ward
MOBILE phones which use satellites to transmit conversations could seriously disrupt
research into the formation of galaxies and the death of stars, a leading astronomer
claimed yesterday.
Up to half of current radio astronomy research will be threatened by interference from
phone conversations relayed from space on the same frequencies that scientists use to
monitor readings from stars, said Dr James Cohen of the Nuffield Radio Astronomy
Laboratories, Cheshire.He fears that telephone conversations will overprint weaker
signals received from space by radio telescopes.
"It's like a professional photographer who, despite being equipped with the latest in
modern cameras, finds that just as he presses the shutter, someone shines a torch into his lens."
Telecommunications companies are preparing to launch their first satellites next year,
allowing communication from remote locations, currently inaccessible with the
ground-based cellular mobile phones.
Mobile phone companies have already been granted permission to operate on the 1600
megahertz frequency which astronomers use to record radio emissions from dying stars
otherwise hidden by clouds of dust and gas.
The International Telecommunications Union will consider next autumn how to accommodate the needs of the astronomers.
"It's still a problem unresolved," a spokesman said.
Satellite-linked mobile phone handsets will cause interference within a 100-mile radius of the seven radio telescopes in Britain.
The orbiting satellites - circling within 10,000km of the Earth's surface - will cause problems for facilities across the world.
It is estimated that there wil be a million users of satellite-linked mobile phones by the end of the century.