Phase shift keying communication system

Claim 1

A SIGNAL TRANSMITTING DEVICE FOR THE TRANSMISSION OF PHASE SHIFT KEYED SIGNALS OF A GIVEN FREQUENCY WITH PORTIONS OF THREE DIFFERENT PHASES INCLUDING MEANS PROVIDING A SIGNAL OF A GIVEN FREQUENCY; A MODULATOR STAGE INCLUDING A TRANSFORMER HAVING A PRIMARY AND A SECONDARY WINDING, A THREE-POSITION SWITCH INCLUDING A MOVABLE POLE AND A SET OF THREE INDIVIDUAL CONTACTS, AN INDUCTOR AND CAPACITOR EACH HAVING ONE TERMINAL THEREOF CONNECTED TO AN END OF SAID SECONDARY WINDING AND THE OPPOSITE TERMINAL THEREOF CONNECTED TO A PAIR OF SAID CONTACTS RESPECTIVELY, A RESISTOR CONDUCTIVELY CONNECTED BETWEEN THE OPPOSITE END OF SAID SECONDARY WINDING AND SAID MOVABLE POLE OF SAID THREE-POSITION SWITCH; A MODULATOR KEYING STAGE FOR CONTROLLING THE MOVEMENT OF SAID MOVABLE POLE; AND MEANS CONNECTED TO SAID MOVABLE POLE AND A POINT INTERMEDIATE THE ENDS OF SAID SECONDARY WINDING FOR PROPAGATING THE SIGNAL APPEARING BETWEEN SAID MOVABLE POLE AND SAID POINT.