Receiver amplifier for track vehicle - is inductively coupled via antennae with track line amplifying and processing signals for HF band of data transmission system

摘要

The vehicle is inductively coupled by two antennas with a line laid along the track. The received signals are amplified and processed for the HF receiving part of a data transmission system. Two similar amplifiers near the antennas consist of an isolator, an amplifier, a trigger and a threshold switch. When the input signal level is sufficient, a rectangular signal is switched through to the output. A third amplifier consists of a phase shifter, summator amplifer, trigger and a threshold switch. the phase shifter alters the phase of the signals from both antennas by 90 deg.