Monitoring circuit for transmitter power amplifiers

Claim 1

A MONITORING CIRCUIT FOR TRAVELING WAVE TUBE POWER AMPLIFIERS COMPRISING: AN INPUT FOR TRIGGER PULSES; A MONITOR SIGNAL LIGHT AND A SEMICONDUCTOR SWITCH IN CIRCUIT WITH A VOLTAGE SUPPLY, SAID SWITCH HAVING A CONTROL ELECTRODE THEREFOR; A PULSE FORMER CIRCUIT, A SHORT PULSE REJECT CIRCUIT, A TEN-PULSE INTEGRATOR CIRCUIT, AND A DELAY CIRCUIT COUPLED IN SERIES FROM SAID INPUT TO SAID CONTROL ELECTRODE OF SAID SEMICONDUCTOR SWITCH TO PRODUCE A CONTROL SIGNAL TO CONTROL SAID SEMICONDUCTOR SWITCH TO ENERGIZE SAID MONITOR SIGNAL LIGHT; TRAVELING WAVE TUBES, HAVING THE CATHODES, GRIDS, AND COLLECTORS COUPLED IN COMMON AND EACH HAVING THE COLLECTOR OUTPUT WITH A CURRENT SENSING MEANS ASSOCIATED THEREWITH TO SENSE THE AMOUNT OF CURRENT FLOW IN EACH COLLECTOR, SAID COMMONLY COUPLED GRIDS COUPLED TO RECEIVE SAID SIGNAL PULSES FROM SAID INPUT; INHIBIT CIRCUIT MEANS COUPLED TO SAID CURRENT SENSING MEANS AS AN INPUT THERETO AND TO SAID TEN-PULSE INTEGRATION CIRCUIT AS AN OUTPUT THEREFROM TO PRODUCE AN INHIBIT SIGNAL WHEN SAID CURRENT SENSING MEANS SENSES PROPER AND EQUAL CURRENT FLOW IN EACH COLLECTOR OUTPUT APPLIED TO SAID TEN-PULSE INTEGRATOR TO INHIBIT SAID CONTROL SIGNAL FROM ENERGIZING SAID MONITOR LIGHT AND TO PRODUCE NO INHIBIT SIGNAL WHEN SAID CURRENT SENSING MEANS SENSES IMPROPER LOW AND UNEQUAL CURRENT FLOW IN THE COLLECTOR OUTPUTS WHEREBY OPERATION OF SAID TRAVELING WAVE TUBES IS MONITORED.