1. A high frequency (HF) frequency-management system that performs automatic selection of the optimum HF frequency for reliable communications between two or more stations of an HF net and dissemination of the optimum frequency, for the automatic establishment of HF communications path between two or more radio stations of the said net, comprising of a frequency management means that controls the operation of a regular HF radio communications transmitter and receiver at each stations; the said frequency-management means comprising means for transmitting sounding signals synchronously and repeatedly over a finite group of HF frequencies, from a first radio communications station to a second radio communications station; means for link quality evaluation (LQE) at the second station; means for transmitting back sounding signals, synchronously and repeatedly over said finite group of HF frequencies, from said second station back to said first station; means for selecting optimum HF frequencies at the said first station, based on said sounding signals and LQE; means for dissemination of said optimum HF frequencies information, by the said first station to the said second station (and all other stations in the net), for the automatic establishment of an HF communications path between said stations, wherein said first and second stations utlize said regular HF radio communications transmitter and receiver for both the frequency management functions as well as for the usual communication function, in time interleaved mode controlled by the said frequency management means; and means for monitoring the noise and interferences on said finite group of HF frequencies, means for searching for incoming communication or sounding calls; means for performing the timing and control of the HF radios; means for acquiring and maintaining synchronization of the frequency management system and communication net; and each said means performing the scanning of the HF frequencies, the detection and measurement of signals, noise and interferences on each frequency and the timing synchronization as required for the frequency management operation.