Mobile passive repeater system for radio communications for buildings has special antennas with high gain in narrow frequency band connecting radio communications system to HF line

摘要

The mobile passive repeater system has 2 special antennas (1,2) with high gain in a narrow frequency band of 66-500 MHz with which the radio communications system is passively directly connected to an external HF line outside and within the building. External transmission and reception stations can be optionally connected directly via an HF socket (4) of a 3-way HF coupler (3) to the low-loss HF line (7,8) in parallel with the external antenna.