Relaisstation für ein Funkrufsystem

摘要

A repeater for installation as a measure for silent zones, which automatically compensates for a variation in a light loss caused by a difference in length among optical cables interconnecting a master device (3) and a plurality of slave devices (4) which are allocated and installed in an underground shopping center or the like. The master device and the slaves devices each have current detectors (35-1 to 35-n; 44) for detecting current values of O/E transducers which transduce received light to electric signals. Based on the detected current values, gain control signals are applied to variable gain amplifiers (36-1 to 36-n) to change their amplification factors so that the levels of output RF signals for transmission to a radio base station and a portable station have a prescribed value, thereby compensating for the variation in the light loss of the optical cables (5). This repeater greatly facilitates its installation and additional installation of slave devices.