Selection technique of the optimal frequency for data transmission through the ionosphere

A technique was described by which the reception conditions for a radio-electric channel, preselected according to an operational sequence, may be assured to be satisfactory. Criteria are given by which a test sequence may be transmitted and analyzed following its reception. The relationship of the stations and their operating mode in centralized networks was then given, based on information received from an ionosonde; a discussion of decentralized networks with a reduced number of stations was also given.