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METHOD OF REPEATING RF-BORNE SIGNAL ACROSS AN EARTH BARRIER

  • US 3,715,664 A
  • Filed: 02/12/1971
  • Issued: 02/06/1973
  • Est. Priority Date: 02/12/1971
  • Status: Expired due to Term
First Claim
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1. A method of relaying modulated rf in hilly, mountainous or scarred terrain comprising the steps of intercepting the rf in the atmosphere at a first site backed by a rise in the terrain, detecting the modulation of the intercepted rf, generating LF electrical current and modulating the LF electrical current corresponding to the detected modulation on the intercepted rf, converting the LF electrical current at the first site to earthpenetrating energy of corresponding waveform, sensing the earth-penetrating LF energy at a second site separated from the first site by the rise in terrain where the rise in terrain between the two sites blocks transfer of rf between the two sites, detecting at the second site the modulation on the sensed earthpenetrating LF energy, generating rf of the same frequency at the second site and modulating the rf in accordance with the modulation detected at the second site and radiating the modulated rf from the second site at higher intensity than the rf intercepted at the first site.

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