Circuit supporting mechanical shock isolator for radio receiver

A selective call receiver for receiving transmitted messages, comprising:

• a housing;
• a circuit supporting substrate within the housing and mechanically coupled thereto;
• electronic circuitry, at least a portion of which being mechanically coupled to the circuit supporting substrate, including at least one of:
• receiving means for receiving a message comprising an address;
• decoding means coupled to the receiving means for decoding the received message, and for determining if the received address matches a predetermined address;
• and
• alert means coupled to the decoding means for generating an alert if the received address matches the predetermined address;
• and
• mechanically shock isolation means within the housing and mechanically coupled to the circuit supporting substrate for substantially increasing the natural frequency of vibration of the circuit supporting substrate, the mechanical shock isolation means including an electrically conductive layer being electrically coupled to the electronic circuitry,
• wherein the electronic circuitry includes control means capable of being electrically coupled to the electrically conductive layer of the mechanical shock isolation means to form an electrical loop circuit for sensing electrical integrity of the electrical loop circuit to determine when the mechanical shock isolation means is misplaced or missing in the housing.