(19)

(11)

EP 0 909 488 A2

(12)

(43) Date of publication: 21.04.1999 Bulletin 1999/16 (21) Application number: 97954801.0 (22) Date of filing: 30.12.1997

(51) International Patent Classification (IPC):  H04B 10/ 08( . ) (86) International application number: PCT/US1997/024052 (87) International publication number: WO 1998/032255 (23.07.1998 Gazette 1998/29)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI NL (30) Priority: 02.01.1997 GB 19970000008 (71) Applicant: EG & G INSTRUMENTS, INC. Oak Ridge, Tennessee 37831-0895 (US)	(72) Inventor: BARLOW, Arthur, J. Alton, Hampshire GU34 5AH (GB) (74) Representative: Jones, Graham H., et al  Graham Jones & Company 77 Beaconsfield Road Blackheath London SE3 7LG London SE3 7LG (GB)