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Transmitter detector for use in a moving vehicle

  • US 4,841,302 A
  • Filed: 01/30/1987
  • Issued: 06/20/1989
  • Est. Priority Date: 01/30/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting the proximity of a radio transmitter of known frequency and power to a moving vehicle, comprising:

  • a radio frequency scanner having a selected channel set to said known frequency so that it provides a channel active signal during the time that a signal is received on said known frequency;

    timing means responsive to said channel active signal for generating a timing delay signal having a duration representative of the maximum time for said moving vehicle to pass said transmitter based on an estimated speed of said vehicle and the range of said transmitter; and

    alert means responsive to said channel active signal and said timing delay signal for generating an operator alert during said channel active signal and during said timing delay signal.

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