(19)
(11) EP 0 314 930 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
09.05.1990 Bulletin 1990/19

(43) Date of publication A2:
10.05.1989 Bulletin 1989/19

(21) Application number: 88116533.6

(22) Date of filing: 06.10.1988
(51) International Patent Classification (IPC)4: H01Q 3/00
(84) Designated Contracting States:
DE FR GB SE

(30) Priority: 02.11.1987 IT 2247987

(71) Applicant: BRIONVEGA S.p.A.
I-20132 Milano (IT)

(72) Inventors:
  • Pini, Raffaello
    Brugherio (MI) (IT)
  • Banfi, Francesco
    Vimercate (MI) (IT)

(74) Representative: Forattini, Amelia et al
c/o Internazionale Brevetti Ingg. ZINI, MARANESI & C. S.r.l. Piazza Castello 1
20121 Milano
20121 Milano (IT)


(56) References cited: : 
   
       


    (54) Method and apparatus for transmitting control signals to actuators in television satellite receivers


    (57) The apparatus comprises: at least one receiving antenna (16) having one or more actuators (15); a coaxial transmission cable (13); at least one internal unit (9); first circuit means (1) for transmitting control signals to one end of the cable; second circuit means (17) for receiving and decoding the signals received at the other end of the cable and adapted to operate the actuators. The information for operating the actuators being obtained by modulating the direct tension, powering the external unit, with adapted pulses. The direct power tension normally overlaps the radiofrequency signal in the coaxial transmission cable and the modulation depth is such that it has no effect on the external unit powering. This allows, for transmitting the control signal, to use the same single coaxial cable for transmitting the radiofrequency signals.







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