×

Method of and system for classifying emergency locating transmitters and emergency positions indicating radio beacons

  • US 4,394,777 A
  • Filed: 12/12/1979
  • Issued: 07/19/1983
  • Est. Priority Date: 12/12/1979
  • Status: Expired due to Term
First Claim
Patent Images

1. A distress location transmitter, comprising:

  • oscillator means for generating a carrier signal to be supplied to an antenna during a distress call;

    means for modulating said carrier signal with a distress characteristic waveform; and

    means for periodically disabling said modulating means at a predetermined rate corresponding to one of a plurality of classes of user for said distress location transmitter in providing a period of unmodulated carrier to identify said user class associated with said distress call.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×