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Emergency vehicle detector

  • US 5,559,508 A
  • Filed: 08/10/1994
  • Issued: 09/24/1996
  • Est. Priority Date: 08/10/1994
  • Status: Expired due to Term
First Claim
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1. In a radar detector having means for detecting the presence of a radio frequency signal within a preselected frequency band and means for generating an alert thereto, wherein in the improvement, the detecting means includes means for distinguishing at least two discrete radio frequency signals each of which is fixed at a different frequency within the preselected frequency band and means for generating a modified alert upon detecting and distinguishing the discrete signals, wherein the discrete signals are fixed so as to differ in frequency by at least 40 MHz.

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