Single sideband transceiver having common transmit and receive apparatus

Claim 1

A SINGLE SIDEBAND RADIO APPARATUS INCLUDING A TRANSMITTER AND RECEIVER WITH CIRCUIT ELEMENTS FUNCTIONALLY COMMON TO EACH, AND WHEREIN SAID APPARATUS IS OPERABLE IN EITHER THE UPPER OR THE LOWER SAIDBAND OF A FREQUENCY CHANNEL SELECTED FROM A PLURALITY OF AVAILABLE CHANNELS, COMPRISING IN COMBINATION: A COMMON CARRIER OSCILLATOR OPERABLE AT PREDETERMINED CARRIER FREQUENCY; A SOURCE OF MODULATING SIGNAL TO BE TRANSMITTED; TRANSMITTER MODULATOR MEANS ELECTRICALLY INTERCONNECTED WITH SAID CARRIER OSCILLATOR AND SAID SOURCE AND EFFECTIVE TO PRODUCE SIDEBAND SIGNAL COMPONENTS THEREOF; FIRST COMMON CIRCUIT MEANS EFFECTIVE TO PRODUCE ONE OF SAID SIDEBANDS SUBSTANTIALLY FREE OF THE OTHER SIDEBAND; A COMMON SELECTABLE CHANNEL OSCILLATOR HAVING A FREQUENCY EQUAL TO THE DIFFERENCE IN FREQUENCY BETWEEN THE COMMON CARRIER OSCILLATOR AND THE FREQUENCIES OF SAID AVAILABLE CHANNELS, RESPECTIVELY, SAID OSCILLATOR BEING SELECTIVELY OPERABLE AT ANY ONE OF A PLURALITY OF SAID FREQUENCIES; SECOND COMMON CIRCUIT MEANS OPERABLE TO PRODUCE SIGNAL HAVING SUBSTANTIALLY TWICE THE FREQUENCY OF SAID COMMON CARRIER OSCILLATOR AND DIFFERING THEREFROM BY A PREDETERMINED AMOUNT IN THE OPPOSITE SENSE TO THE DIFFERENCE BETWEEN SAID ONE SIDEBAND AND THE CARRIER; COMMON SIGNAL MIXING MEANS TO MIX SIGNALS FROM SAID LAST MEANS AND SAID SELECTABLE CHANNEL OSCILLATOR, THEREBY PRODUCING OSCILLATIONS OF FREQUENCY SUBSTANTIALLY EQUAL TO THE SUM OF THE SELECTABLE CHANNEL OSCILLATOR FREQUENCY AND TWICE THE CARRIER FREQUENCY; FIRST TRANSMITTER MEANS OPERABLE TO MIX SIGNAL FROM SAID FIRST CIRCUIT MEANS AND, SELECTIVELY, OSCILLATIONS FROM SAID SELECTABLE CHANNEL OSCILLATOR OR SAID SECOND CIRCUIT MEANS, THEREBY SELECTIVELY PROVIDING SIGNALS IN EITHER THE UPPER OR THE LOWER SIDEBAND OF THE SELECTED CHANNEL; MEANS FOR ELECTRICALLY INTERCONNECTING SAID FIRST TRANSMITTER MEANS, SAID FIRST CIRCUIT MEANS, SAID CHANNEL OSCILLATOR MEANS, AND SAID CIRCUIT MEANS;