Transmission station using excitation signal - has synchronised time generator and quasi-random time generator actuated when synchronising signal fails

摘要

The transmission station has two time generators (2, 3) of which one is adjustable so as to coccupy a slot in the time generators are actuated automatically when synchronisation spectrum of several such stations. The other is a quasi-random time sequence generator. The adjustable time generators of all such stations are synchronised by a central station. The quasi-random time generators are actuated automatically when synchronisation fails. The adjustable time generator consists of a controllable counter whilst the other generator is free-running.