a system intended for the simultaneous reception of several tv channels retransmitted by satellites . this system comprises a multi - frequency microwave frequency head , installed in an external unit , whose inputs are connected to the satellite antennas . wide band demodulation is made possible by a microwave frequency source controlled by a synthesizer . digital signals transmitted by a link cable ensure programming of the synthesizer and therefore of the selected tv channels . a remodulation in amplitude modulation is performed for supplying signals in the 40 - 860 mhz band , carried by an existing link cable for terrestrial antennas . the system finds particular application to the simultaneous reception of several tv channels .