The Swedish Telecommunications Administration is operating a system capable of automatic handling of teleprinter traffic on the HF bands. Radio transmission is based on the CCIR-specified simplex-ARQ. Ships participating in the system can be accessed from the international telex network as ordinary telex subscribers. The system operates normally in a store-and-forward mode. The coast station terminal uses a computer for traffic handling and control of radio receivers and transmitters. Optimum selection of frequency band and directional antennae is based on a stored propagation forecast and a knowledge of approximate positions of participating ships. Equipment operation on board is fully automatic and unattended. Transmission of messages from the ship is initiated through simple pushbutton operation. Traffic delay is such that 80-90% of all traffic from shore to ship is delivered inside 2 hours. The corresponding figure for manual morse is typically 30% within 2 hours. Installation and traffic costs are roughly 30-50% of the costs for satellite equipment. About one third of the Swedish ocean-going merchant fleet is already equipped with Maritex.

Media Info

  • Pagination: p. 1-4
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00174296
  • Record Type: Publication
  • Source Agency: Radio Technical Commission for Marine Services
  • Report/Paper Numbers: Paper 104-77/DO-96
  • Files: TRIS
  • Created Date: Jun 14 1978 12:00AM