Frequency-type telemeter transmitter

Claim 1

IN A FREQUENCY-TYPE OF TELEMETER TRANSMITTER PARTICULARLY ADAPTED FOR THE PROVISION OF A RELATIVELY LOW FREQUENCY OUTPUT SIGNAL WHICH VARIES IN RESPONSE TO A RELATIVELY SMALL DIRECT CURRENT INPUT SIGNAL, A DIRECT CURRENT AMPLIFIER PROVIDING AN AMPLIFIED OUTPUT SIGNAL WHICH VARIES AS A FUNCTION OF THE CURRENT FLOWING IN ITS INPUT CIRCUIT, A COMMON BASE TRANSISTOR NETWORK HAVING THE EMITTERBASE CIRCUIT THEREOF CONNECTED TO THE OUTPUT OF SAID AMPLIFIER, AND THE COLLECTOR-BASE CIRCUIT THEREOF CONNECTED TO A FREQUENCY GENERATING CIRCUIT, SAID FREQUENCY GENERATING CIRCUIT PROVIDING AN OUTPUT FREQUENCY WHICH VARIES IN ACCORDANCE WITH THE SIGNAL CURRENT FLOWING IN SAID COLLECT-BASE CIRCUIT, SAID SIGNAL CURRENT VARYING IN MAGNITUDE IN RESPONSE TO VARIATIONS IN MAGNITUDE OF SAID AMPLIFIED OUTPUT SIGNAL, MEANS COUPLED TO SAID COLLECTOR-BASE CIRCUIT OF SAID COMMON BASE TRANSISTOR STAGE FOR DEVELOPING A FEEDBACK SIGNAL PROPORTIONAL TO SAID SIGNAL CURRENT, MEANS CONNECTED TO SAID INPUT CIRCUIT FOR OBTAINING A CURRENT FLOW THEREIN WHICH IS EQUAL TO THE DIFFERENCE BETWEEN SAID INPUT AND FEEDBACK SIGNALS, AND MEANS TO CONNECT THE OUTPUT OF SAID FREQUENCY GENERATING CIRCUIT TO A COMMUNICATION CHANNEL.