Patent ID: 6175324
Filing Date: 2001-01-16
Classification: G01S

Abstract:
A police radar detector comprising:an antenna for receiving incoming electromagnetic signals;a first local oscillator generating a first local oscillator signal which is swept through a first range of frequencies to sweep the X, K and K.sub.a radar bands and a second range of frequencies to sweep the K.sub.u radar band;a first mixer coupled to said antenna and said first local oscillator for mixing said incoming electromagnetic signals with said first local oscillator signal to generate first intermediate frequency signals;a second local oscillator for generating a second local oscillator signal;a second mixer coupled to said first mixer for mixing said first intermediate frequency signals with said second local oscillator signal to generate second intermediate frequency signals at a second intermediate frequency;detector circuitry coupled to said second mixer for detecting received electromagnetic signals within the X, K.sub.u, K and K.sub.a radar bands; andsignal conditioning and control circuitry for selectively enabling said second local oscillator when said X, K and K.sub.a radar bands are swept and disabling said second local oscillator and bypassing said second mixer when said K.sub.u radar band is swept.