Automatic direction finder receiver

Claim 1

AN AUTOMATIC DIRECTION FINDER RECEIVER COMPRISING A ROTATABLE LOOP GONIOMETER, A CAPACITIVE SENSE ANTENNA, CIRCUIT MEANS FOR COMPARING THE PHASES OF THE SIGNALS INTERCEPTED BY SAID LOOP GONIOMETER ANS SAID CAPACITIVE SENSE ANTENNA WHEN SAID CAPACITIVE SENSE ANTENNA IS ELECTRICALLY CONNECTED TO SAID CIRCUIT MEANS TO PROVIDE AN OUTPUT SIGNAL HAVING A CHARACTERISTIC WHICH IS INDICATIVE OF THE RELATIVE POSITION OF SAID GONIOMETER AND THE DIRECTION OF PROPAGATION OF THE RECEIVED SIGNAL, SERVO MEANS CONSTRUCTED AND ARRANGED TO BE RESPONSIVE TO SAID OUTPUT SIGNAL TO ROTATE SAID GONIOMETER TO THE CORRECT NULL POSITION WITH RESPECT TO THE RECEIVED SIGNAL, INDUCTIVE LOOP SENSING ANTENNA MEANS ARRANGED IN SPACE QUADRATURE WITH SAID LOOP GONIMETER, FIRST SWITCHING MEANS CONSTRUCTED TO CONNECT SAID CAPACITIVE SENSE ANTENNA TO SAID CIRCUIT MEANS, NSAID SWITCHING MEANS FURTHER BEING CONSTRUCTED TO RESPOND TO THE NULL POSITION OF SAID GONIOMETER TO DISCONNECT SAID CAPACITIVE SENSE ANTENNA FROM THE AUTOMATIC DIRECTION FINDER RECEIVER AND TO CONNECT SAID INDUCTIVE LOOP SENSE ANTENNA INTO SAID AUTOMATIC DIRECTION FINDER RECEIVER IN LIEU OF SAID CAPACITIVE SENSE ANTENNA.