Societa Italiana Telecomunicazioni Siemens S.p.a.

Gte Telecomunicazioni S.p.a.

Telespazio S.p.a. Per Le Comunicazioni Spaziali

Roberto Cafissi

Enzo Cavalieri D'Oro

Sebastiano Tirro

A station for the transmission and reception of electromagnetic waves (e.g. from a communication satellite in stationary earth orbit), operating in a multichannel band with two conjugate polarizations, includes a regenerative distortion compensator in a receiving waveguide branch and a predistorter in a transmitting waveguide branch, both controlled by a processor responsive to output signals from a subsequent i-f stage in which a distortion monitor measures cross-talk between the two polarizations on the basis of two central beacons extracted from the incoming message band. The distortion monitor is preceded within the i-f stage by a phase and amplitude stabilizer and is followed by a demodulating stage in which the message signals are distributed to different transmission paths corresponding to the several channels, each transmission path including an individual cancellation-type distortion corrector controlled either by coherent detectors responding to respective channel beacons or by correlators fed with message signals from the two polarizations.

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Monza, Italy

Roberto Cafissi