Radio network operating on same wavelength - has interference signalling device replacing synchronising oscillation source when interference becomes excessive

摘要

The system has a several transmitters of which at least one is synchronised by a reference oscillation. The source of reference oscillations has a reserve source of oscillations and an interference signalling device, which, when a limit is reached, connects the reserve oscillation source instead of the source of reference oscillations. The interference signalling device has in addition to an internal interference limit signalling device a unit similar to that of the transmitter to be synchronised, by which the transmitter is synchronised.