High reliability H.F. communications to span the oceans

Long distance communications over the oceans can only be accomplished with H.F. radio or Satellites. Satellite system costs are extremely high and no significant cost reductions are being projected over the next 10-20 years. H.F. Communications systems however can be very economical but usually exhibit poor reliability and often less than desirable quality. This paper describes an automatic H.F. radio system giving greatly improved communications reliability. This improved reliability is achieved through the use of real time information of signal and interference levels on each channel allocated to a particular H.F. radio network. Automatic Selective Calling is also incorporated this eliminating manual calling and monitoring requirements.