Title :
A radio communications system for the English Channel Tunnel
Author :
Morgan, Michael A. ; Sohner, Harold K.
Author_Institution :
Andrew Commun. Syst., Richardson, TX, USA
Abstract :
The authors describe the 2-way, 42-channel VHF radio communications system supporting the construction activities of the English Channel Tunnel. The system was designed to use radiating coaxial cable and bidirectional repeater line amplifiers as the principal signal distribution scheme. Attention is given to signal distribution, channelization, frequency reuse methods, signaling schemes, and the audio interconnection used in a system utilizing 42 channels of radio communication to support tunneling operations. Link performance calculations are presented including intermodulation and thermal noise considerations. For the designed maximum of 23 cascaded amplifiers the system carrier-to-intermodulation ratio was 24.8 dB. Actual measurements in the Service Tunnel agree with predictions
Keywords :
intermodulation; mobile radio systems; 2-way system; 42 channels; English Channel Tunnel; VHF; audio interconnection; bidirectional repeater line amplifiers; carrier-to-intermodulation ratio; frequency reuse; intermodulation; link performance calculations; mobile radio; radiating coaxial cable; radio communications system; signal distribution scheme; signaling schemes; thermal noise considerations; Coaxial cables; Frequency; Land mobile radio; Mobile communication; Project management; RF signals; Radio communication; Rails; Signal design; Tunneling;
Conference_Titel :
Vehicular Technology Conference, 1989, IEEE 39th
Conference_Location :
San Francisco, CA
DOI :
10.1109/VETEC.1989.40103
