(19)

(11)

EP 0 313 623 A1

(12)

(43) Date of publication: 03.05.1989 Bulletin 1989/18 (21) Application number: 88904246.0 (22) Date of filing: 13.05.1988

(51) International Patent Classification (IPC):  H01Q 15/ 02( . ) H01Q 19/ 06( . ) H01Q 25/ 00( . ) H01Q 3/ 14( . ) H01Q 21/ 00( . ) (86) International application number: PCT/GB1988/000374 (87) International publication number: WO 1988/009066 (17.11.1988 Gazette 1988/25)

(84) Designated Contracting States: AT BE CH DE FR IT LI LU NL SE (30) Priority: 13.05.1987 GB 19870011271 (71) Applicant: BRITISH BROADCASTING CORPORATION London W1A 1AA (GB)	(72) Inventors: SMITH, Martin, Stevens Chelmsford Essex CM1 4XQ (GB) MADDOCKS, Mark, Charles, Dobell Reigate Surrey (GB) SHELSWELL, Peter Horley Surrey (GB) (74) Representative: Pears, David Ashley, et al  REDDIE & GROSE 16 Theobalds Road London WC1X 8PL London WC1X 8PL (GB)