Radio signal receiving apparatus with a security circuitry

Abstract From the Canadian patent

A radio signal receiving apparatus such as a pager with a security circuitry includes operator-controlled switches for providing a plurality of different command signals which are used to actuate the receiving apparatus in a different mode of operation, an interface circuitry with an optional feature circuitry coupled to the receiving circuitry of the apparatus for providing various optional functions such as automatic reset single/dual function or battery saving functions to the receiving apparatus, and a security circuitry for preventing the receiving apparatus from receiving the incoming signal once tampering of the optional feature security is detected.