Digital modulation transmission system - uses series of two bilateral repeaters between two stations with received and transmitted signals in opposite halves of frequency band

摘要

The digital modulated transmission system transmits by hertzian beam between two stations using the 'route diversity' principle. Two routes assume distinct paths. The two stations each have switching circuits which, as a function of the quality of signals received on the two routes, deliver to the receiver the signals of one or the other of the two routes. Between the two stations there is a series of two bilateral repeaters which frequency transpose the signals they receive. The transposition is such that the signals received by the two stations are all situated in one half of the total frequency band. The signals transmitted by the two stations are all situated in the other half of the frequency band.