Signal selector circuit for passive detection apparatus

Claim 1

IN RADIO FREQUENCY DETECTION APPARATUS, IN COMBINATION, A FIRST RECEIVER OF RADIO FREQUENCY SIGNALS, A SECOND RECEIVER OF RADIO FREQUENCY SIGNALS, THE FIRST RECEIVER HAVING A BROAD BANDWIDTH RELATIVE TO THE BANDWIDTH OF THE SECOND RECEIVER, THE SECOND RECEIVER BEING TUNABLE OVER THE BROAD BANDWIDTH OF THE FIRST RECEIVER, A PLURALITY OF DIRECTIONAL ANTENNAS OPERATIVELY CONNECTED TO THE FIRST RECEIVER FOR SUPPLYING A PLURALITY OF PULSED RADIO FREQUENCY SIGNALS SIMULTANEOUSLY TO THE FIRST RECEIVER, EACH OF SAID PLURALITY OF PULSED RADIO FREQUENCY SIGNALS LYING WITHIN SAID BROAD BANDWIDTH, AN OMNIDIRECTIONAL ANTENNA OPERATIVELY CONNECTED TO THE SECOND RECEIVER FOR SUPPLYING SAID PLURALITY OF PULSED RADIO FREQUENCY SIGNALS TO THE SECOND RECEIVER, SAID SECOND RECEIVER BEING TUNED TO AND PASSING TO THE OUTPUT THEREOF ONLY ONE OF THE PLURALITY OF PULSED RADIO FREQUENCY SIGNALS APPLIED TO THE SECOND RECEIVER, AND GATE GENERATOR MEANS OPERATIVELY CONNECTED TO THE SECOND RECEIVER FOR GENERATING A GATE SIGNAL WHILE A PULSE IS OCCURRING IN THE PULSED RADIO FREQUENCY SIGNAL PASSED TO THE OUTPUT OF THE SECOND RECEIVER, SAID GATE GENERATOR MEANS BEING OPERATIVELY CONNECTED TO THE FIRST RECEIVER, THE GATE SIGNAL FROM THE GATE GENERATOR MEANS CONTROLLING THE PASSAGE OF SIGNALS FROM SAID PLURALITY OF DIRECTIONAL ANTENNAS TO THE OUTPUT OF THE FIRST RECEIVER SELECTIVELY IN ACCORDANCE WITH THE TIME COINCIDENCE AND LACK OF TIME COINCIDENT OF PULSES IN ANY ONE OF SAID PLURALITY OF RADIO FREQUENCY SIGNALS WITH THE GATE SIGNAL.