Radio communications equipment with sectionalized chassis and heat sinks

Claim 1

COMMUNICATIONS APPARATUS FOR INSTALLATION IN A VEHICLE HAVING AN ELECTRICAL SYSTEM TO PROVIDE A TWO-WAY COMMUNICATIONS INCLUDING IN COMBINATION, A RADIO OPERATING UNIT INCLUDING RECEIVER, POWER SUPPLY AND TRANSMITTER UNITS CHASSIS SECTIONS, SAID RECEIVER BEING COMPLETELY TRANSISTORIZED FOR OPERATION DIRECTLY FROM THE ELECTRICAL SYSTEM OF THE VEHICLE, SAID TRANSMITTER INCLUDING HIGH POWER AMPLIFYING ELEMENTS, SAID POWER SUPPLY PROVIDING THE OPERATING VOLTAGES FOR SAID TRANSMITTER AND HAVING POWER TRANSISTOR SWITCHING DEVICES, FIRST, SECOND AND THRID HEAT SINKS, AND HOUSING MEANS FOR ENCLOSING SAID RADIO UNIT AND HAVING AN OPEN FRAME AT ITS REARWARD END, SAID FIRST HEAT SINK BEING AFFIXED TO SAID REARWARD END OF SAID TRANSMITTER CHASSIS UNIT AND HAVING A RECESSED CAVITY TO HOUSE SAID HIGH POWER AMPLIFYING ELEMENTS, SAID FIRST HEAT SINK EXTENDING THROUGH SAID OPEN FRAME OF SAID HOUSING MEANS, SAID SECOND AND THRID HEAT SINKS BEING AFFIXED TO OPPOSING SIDES OF THE RADIO UNIT AND HAVING MEANS FOR MECHANICALLY SECURING SAID CHASSIS SECTIONS IN ASSEMBLED RELATION, SAID SECOND AND THIRD HEAT SINKS EACH HAVING A RECESSED CAVITY FOR CONTAINING SAID POWER TRANSISTOR SWITCHING DEVICES OF SAID POWER SUPPLY MOUNTED THEREIN, COVER MEANS SECURED TO SAID SECOND AND THIRD HEAT SINKS FOR ENCLOSING SAID TRANSISTOR SWITHCING DEVICES THEREON, AND INSULATING MEANS FOR ISOLATING SAID POWER TRANSISTORS FORM GROUND POTENTIAL WHEREBY THE RADIO UNIT IS OPERABLE FROM AN ELECTRICAL SYSTEM OF EITHER ELECTRICAL POLARITY.