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In order for operating a complex of phased arrays to be provided, individual arrays, comprising the complex, should be mutually synchronized. Naturally, the delta-function pulse is an ideal sync-signal, but in practice, it can be realized rather approximately. That is why some general requirements to the sync-signals have to be satisfied in the synchronously operating complex of phased arrays with an arbitrary arrangement. These signals should be precisely determined in the time scale as compared with a temporal interval, corresponding to the cut-off frequency in data flow, or to the time jitter conditioned by any internal instability as well as external perturbation.