Silent link establishment

Telecommunications – Transmitter and receiver at separate stations

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Details

455 62, 455509, 455515, H04B 726

Patent

active

057549443

ABSTRACT:
A method of synchronizing the frequency and time of commencement of high frequency (HF) radio communication between an initiating station and a receiving station in which transmissions from the receiving station are not required. The initiating station determines an optimal frequency from among predetermined HF frequencies for communicating with the receiving station and a time when communication between the initiating and receiving stations is to start. The initiating station transmits an initiation message on each of the predetermined frequencies, where the initiation message provides the optimal frequency and the time until the start of communication. The receiving station scans all of the predetermined frequencies to attempt to receive the initiation message, and upon receipt continuously monitors the optimal frequency and commences a time count-down to the start of communication. Substantive messages are automatically or selectively exchanged between the receiving and initiating stations on the optimal frequency after conclusion of the time count-down.

REFERENCES:
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patent: 4679225 (1987-07-01), Higashiyama
patent: 4792984 (1988-12-01), Matsuo
patent: 4811420 (1989-03-01), Avis et al.
patent: 4980924 (1990-12-01), Reed et al.
patent: 5054111 (1991-10-01), Goodwin
patent: 5206855 (1993-04-01), Schwendeman et al.
patent: 5267244 (1993-11-01), Messerschmitt et al.

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