System for locating modulator malfunction

Claim 1

AN APPARATUS TO INDICATE THE MALFUNCTIONING OF A THYRATRON SWITCH TUBE INCORPORATED IN A MODULATOR, THE GRID ELECTRODE OF SAID SWITCH TUBE RECEIVING DIRECTLY THEREAT ACTUATING POSITIVE PULSES, SAID POSITIVE PULSES BEING SHORT-CIRCUITED TO GROUND UPON SAID MALFUNCTIONING, A TRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS, ONE LEG OF SAID PRIMARY WINDING DIRECTLY CONNECTED TO SAID GRID ELECTRODE OF SAID THYRATRON SWITCH TUBE AND ONE LEG OF SAID SECONDARY WINDING DELIVERING A NEGATIVE PULSE FOR EACH POSITIVE PULSE RECEIVED AT SAID PRIMARY WINDING, AN ELECTRON DISCHARGE DEVICE HAVING CONTROL GRID, CATHODE AND ANODE ELECTRODES, SAID ELECTRON DISCHARGE DEVICE BEING NORMALLY CONDUCTIVE, A DIODE CONNECTED BETWEEN SAID LEG OF SAID SECONDARY WINDING AND SAID CONTROL GRID OF SAID ELECTRON DISCHARGE DEVICE, SAID DIODE BEING ARRANGED TO PASS ONLY NEGATIVE PULSES, A CAPACITOR AND A FIRST FIXED RESISTOR IN PARALLEL COMBINATION CONNECTED BETWEEN SAID CONTROL GRID ELECTRODE OF SAID ELECTRON DISCHARGE DEVICE AND GROUND, SAID COMBINATION BEING SELECTED TO PROVIDE AN AVERAGE BIAS LEVEL AT SAID CONTROL GRID OF SAID ELECTRON DISCHARGE DEVICE SUFFICIENT TO PREVENT CONDUCTION THEREIN UPON THE RECEIPT OF NEGATIVE PULSES BY SAID COMBINATION, AND AN ILLUMINATING CIRCUIT CONSISTING OF A NEON TUBE IN SERIES WITH A SECOND RESISTOR, SAID SERIES COMBINATION BEING CONNECTED BETWEEN A POSITIVE SOURCE OF VOLTAGE AND SAID ANODE ELECTRODE OF SAID ELECTRON DISCHARGE DEVICE, A THIRD RESISTOR IN PARALLEL CIRCUIT WITH SAID SERIES COMBINATION, SAID ILLUMINATING CIRCUIT OPERATING TO ILLUMINATE SAID NEON TUBE UPON THE OCCURRENCE OF CONDUCTION WITHIN SAID ELECTRON DISCHARGE DEVICE.

Claim 2

AN APPARATUS TO INDICATE THE MALFUNCTIONING OF A THYRATRON SWITCH TUBE INCORPORATED IN A MODULATOR, THE GRID ELECTRODE OF SAID SWITCH TUBE RECEIVING DIRECTLY THEREAT ACTUATING POSITIVE PULSES, SAID POSITIVE PULSES BEING SHORT-CIRCUITED TO GROUND UPON SAID MALFUNCTIONING, A TRANSFORMER HAVING PRIMARY AND SECONDARY WINDINGS, ONE LEG OF SAID PRIMARY WINDING DIRECTLY CONNECTED TO SAID GRID ELECTRODE OF SAID THYRATRON SWITCH TUBE AND ONE LEG OF SAID SECONDARY WINDING DELIVERING A NEGATIVE PULSE FOR EACH POSITIVE PULSE RECEIVED AT SAID PRIMARY WINDING, AN ELECTRON DISCHARGE DEVICE HAVING CONTROL GRID, CATHODE AND ANODE ELECTRODES, SAID ELECTRON DISCHARGE DEVICE BEING NORMALLY CONDUCTIVE, A DIODE CONNECTED BETWEEN SAID LEG OF SAID SECONDARY WINDING AND SAID CONTROL GRID OF SAID ELECTRON DISCHARGE DEVICE, SAID DIODE BEING ARRANGED TO PASS ONLY NEGATIVE PULSES, A CAPACITOR AND A FIRST FIXED RESISTOR IN PARALLEL COMBINATION CONNECTED BETWEEN SAID CONTROL GRID ELECTRODE OF SAID ELECTRON DISCHARGE DEVICE AND GROUND, SAID COMBINATION BEING SELECTED TO PROVIDE AN AVERAGE BIAS LEVEL AT SAID CONTROL GRID OF SAID ELECTRON DISCHARGE DEVICE SUFFICIENT TO PREVENT CONDUCTION THEREIN UPON THE RECEIPT OF NEGATIVE PULSES BY SAID COMBINATION, AND AN ILLUMINATING CIRCUIT CONSISTING OF A NEON TUBE IN SERIES WITH A SECOND RESISTOR, SAID SERIES COMBINATION BEING CONNECTED BETWEEN A POSITIVE SOURCE OF VOLTAGE AND SAID ANODE ELECTRODE OF SAID ELECTRON DISCHARGE DEVICE, A THIRD RESISTOR IN PARALLEL CIRCUIT WITH SAID SERIES COMBINATION, SAID ILLUMINATING CIRCUIT OPERATING TO ILLUMINATE SAID NEON TUBE UPON THE OCCURRENCE OF CONDUCTION WITHIN SAID ELECTRON DISCHARGE DEVICE.