Balanced phase type frequency discriminators

Claim 1

A FREQUENCY DISCRIMINATOR COMPRISING: MEANS CONSTITUTING A FIRST TRANSMISSION CHANNEL; A FREQUENCY SENSITIVE WAVE ENERGY REFLECTOR TERMINATING ONE END OF THE FIRST TRANSMISSION CHANNEL, THE WAVE ENERGY REFLECTOR RESPONDING TO CHANGES IN THE FREQUENCY OF AN INCIDENT SIGNAL BY CAUSING THE PHASE OF THE SIGNAL REFLECTED FROM IT TO VARY WITH CHANGES IN THE FREQUENCY OF THE INCIDENT SIGNAL; MEANS CONSTITUTING A SECOND TRANSMISSION CHANNEL; A FREQUENCY INSENSITIVE WAVE ENERGY REFLECTOR TERMINATING ONE END OF THE SECOND TRANSMISSION CHANNEL, THE WAVE ENERGY REFLECTOR CAUSING THE PHASE OF THE SIGNAL REFLECTED FROM IT TO BE INDEPENDENT OF CHANGES IN FREQUENCY OF THE INCIDENT SIGNAL; MEANS FOR COUPLING THE INPUT SIGNAL APPLIED TO THE DISCRIMINATOR INTO EACH CHANNEL IN A MANNER CAUSING THE SIGNAL COUPLED INTO EACH CHANNEL TO PROPAGATE TOWARD THE REFLECTIVELY TERMINATED END; A QUADRATURE HYBRID HAVING TWO INPUT ARMS AND TWO OUTPUT ARMS; THE SIGNAL REFLECTED FROM THE REFLECTIVELY TERMINATED END OF THE FIRST TRANSMISSION CHANNEL BEING DIRECTED ALONG A PATH OF FIXED LENGTH INTO ONE INPUT ARM OF THE QUADRATURE HYBRID; THE SIGNAL REFLECTED FROM THE REFLECTIVELY TREMINATED END OF THE SECOND TRANSMISSION CHANNEL BEING DIRECTED ALONG A PATH OF FIXED LENGTH INTO THE OTHER INPUT ARM OF THE QUADRATURE HYBRID; THE PATH LENGTH FOR THE INPUT SIGNAL WHICH IS DIRECTED BY THE COUPLING MEANS TO THE REFLECTIVELY TERMINATED ENDS OF THE TRANSMISSION CHANNELS AND THENCE TO THE INPUT ARMS OF THE QUADRATURE HYBRID BEING EQUAL FOR BOTH TRANSMISSION CHANNELS WHEREBY THE REFLECTED SIGNALS ARRIVE SIMULTANEOUSLY AT THE INPUT ARMS; AND MEANS FOR SEPARATELY DETECTING THE OUTPUTS FROM THE TWO OUTPUT ARMS OF THE QUADRATURE HYBRID.