Setting gain of downlink and uplink path of mobile repeater for train, involves setting attenuation in uplink path based on parameter generated in automatic level control in downlink

摘要

The gain in the uplink path (7) is simultaneously adjusted, and matched to the level in the downlink path, in response to an automatic level control (18,19,20) in the downlink path (6), . A control parameter generated in the automatic level control is used to generate a control signal (ST) to set the attenuation in the uplink path. The attenuation in the uplink path is be controlled using a digital-to-analog converter. An independent claim is included for an apparatus for setting the gain of a repeater.