Receiver for lecture broadcasting system

Claim 1

AS TRANSISTORIZED RECEIVER COMPRISING AN ANTENNA, SAID ANTENNA COMPRISING A FERRITE ROD, AND R.F. COIL ENCOMPASSING SAID ROD FOR INTERCEPTING R.F. SIGNAL, AND R.F. TUNING CAPACITOR CONNECTED ACROSS AT LEAST A PORTION OF SAID COIL AND TUNING SAID COIL TO A DESIRED R.F. SIGNAL, SAID COIL HAVING NEGLIGIBLE D.C. RESISTANCE, A DETECTOR COMPRISING A TRANSISTOR HAVING A BASE, AN EMITTER AND A COLLECTOR, A D.C. CIRCUIT CONNECTING SAID EMITTER TO A POINT OF SAID COIL, A FURTHER D.C. CIRCUIT CONNECTING SAID BASE TO ANOTHER POINT OF SAID COIL SEPARATED FROM SAID ONE POINT, WHEREBY SAID EMITTER AND BASE ARE AT THE SAME POTENTIAL IN ABSENCE OF SAID R.F. SIGNAL, AND R.F. BYPASS CAPACITOR CONNECTED BETWEEN SAID EMITTER AND SAID COLLECTOR, A SOURCE OF D.C. SUPPLY VOLTAGE IN SERIES WITH EACH OTHER BETWEEN SAID EMITTER AND SAID COLLECTOR, SAID TRANSISTOR BEING DESIGNED TO DRAW ZERO COLLECTOR CURRENT WHILE SAID BASE AND EMITTER ARE AT THE SAME POTENTIAL.