Transceiver selective call system utilizing tuned reed filters

Claim 1

IN A TWO-WAY SELECTIVE CALLING SYSTEM FOR USE BETWEEN A PAIR OF RADIO TRANSCEIVERS, THE COMBINATION AT EACH TRANSCEIVER COMPRISING: TRANSMITTER MEANS; RECEIVER MEANS; FIRST SWITCH MEANS OPERABLE IN RESPONSE TO A SUITABLE SIGNAL TO CONNECT SAID RECEIVER MEANS TO LOUDSPEAKER OUTPUT MEANS; BAND PASS FREQUENCY RESPONSIVE MEANS TUNED TO A SELECTED CALL FREQUENCY AND HAVING AN INPUT WINDING AND AN OUTPUT WINDING; MEANS CONNECTING SAID BAND PASS FREQUENCY RESPONSIVE MEANS INPUT WINDING TO BE ENERGIZED BY SAID RADIO RECEIVER MEANS; CIRCUIT MEANS INCLUDING FURTHER SWITCH MEANS CONNECTED BETWEEN SAID OUTPUT WINDING AND SAID FIRST SWITCH MEANS TO OPERATE SAID FIRST SWITCH MEANS UPON THE OCCURRENCE OF A SIGNAL ON SAID OUTPUT WINDING; AND MEANS INCLUDING AMPLIFIER MEANS AND SAID FURTHER SWITCH MEANS FOR REGENERATIVELY CONNECTING SAID OUTPUT WINDING TO SAID INPUT WINDING SO THAT SAID BAND PASS FREQUENCY RESPONSIVE MEANS OSCILLATES AND PROVIDES AN ELECTRICAL OUTPUT AT SAID SELECTED CALL FREQUENCY, SAID MEANS FURTHER CONNECTING SAID ELECTRICAL OUTPUT TO MODULATE SAID TRANSMITTER MEANS.