RADIO SYSTEM IN CLOSED ENVIRONMENT BETWEEN MOBILE TELEPHONE SYSTEM TERMINALS

摘要

The invention concerns a radio system in closed environment. An individual portable module (1) is connected to a mobile telephone system terminal (T1) and comprises a microwave frequency transponder for receiving a HF signal transmitted by the terminal (T1) and retransmitting a SHF signal in the confined environment. A portable relay (2) is provided to ensure re-amplification of the SHF signal in the closed environment. A terminal station (3) provided with a transponder is placed at the open end (OL) of the closed environment to provide HF link with a cellular telephone system fixed terminal. The invention is applicable to telephone link for staff operating in closed environment.