Transmitter having an oscillator controlled by selectively switched capacitors

Claim 1

IN A TRANSMITTER OF THE TYPE WHICH INCLUDES ONLY ONE NORMALLY FUNCTIONING OSCILLATOR HAVING A TUNED CIRCUIT RESONANT AT A PREDETERMINED FREQUENCY, AN OSCILLATOR KEYING CIRCUIT FOR SHIFTING THE FREQUENCY OF OSCILLATION TO A FREQUENCY WHICH IS EITHER HIGHER LOWER THAN THE SAID PREDETERMINED OSCILLATOR FREQUENCY, THE SAID KEYING CIRCUIT COMPRISING FIRST AND SECOND SWITCHING CIRCUITS, FIRST AND SECOND CAPACITORS DIRECTLY CONNECTING THE RESPECTIVE FIRST AND SECOND SWITCHING CIRCUITS TO THE SAID TUNED OSCILLATOR CIRCUIT, THE FIRST SWITCHING CIRCUIT WHEN CLOSED INCLUDING THE SAID FIRST CAPACITOR IN THE TUNED OSCILLATOR CIRCUIT AND THE SECOND SWITCHING CIRCUIT BEING NORMALLY OPEN TO EFFECTIVELY REMOVE THE SAID SECOND CAPACITOR FROM THE TUNED OSCILLATOR CIRCUIT, AND CONTROL MEANS FOR INDIVIDUALLY CLOSING AND, OPENING THE FIRST SWITCHING CIRCUIT AND CLOSING AND OPENING THE SECOND SWITCHING CIRCUIT.