Radio transmission method in a hazard signalling system

Method for radio transmission of messages in a system of warning notices with a center (Z) and a set of bidirectional and unidirectional subscribers (BT, UT), wherein the center (Z) and bidirectional subscribers (BT1 to BT5) in each case a transmitter equipment and a receiver equipment, while the unidirectional subscribers (UT1, UT2) only possess an issuer computer and trying the unidirectional subscribers (UT2) located outside the radio range recipient announcement unidirectional subscriber , which usually is the central, transmit messages via a bidirectional subscriber (BT1) to the destination (Z), with the following steps: - the notice (aN, MR) sent by a unidirectional subscriber (UT2) is received by all bidirectional subscribers (BT1, BT2, BT5) within its radio range, - each bidirectional subscriber (BT1, BT5) has received notice, wait a timeout (ZS1, ZS5) individually associated himself before retransmit a confirmation and / or notice to the recipient or to the center (Z), - during the waiting time connects each subscriber (BT1, BT2, BT5) to reception to monitor each radio channel in the sense that if another subscriber with shorter waiting confirms and notice and / or relays it to the plant, and - as soon as a subscriber (BT5) receives a confirmation (BS1) announcement or retransmission, suppresses confirmation (BS5) or While retransmission own announcement.