Narrow band synchronized radio communication and alarm system

摘要: A narrow band relatively ultra stable radio apparatus for communicating alarm or data signals from a transmitter device to receiver device, which may be carried by individuals, battery operated fixed other devices, such as smoke detectors burglary sensors, the like, wherein transmitting and receiving are both phase locked 60 Hertz power line signal either direct connection via voltage induced into said devices nearby lines thereby provide means precisely synchronize carrier and/or digital clock stream with achieve very high transmission reliability is disclosed. The capable of an identification code message output simple on-off indicating presence alarm, control attached receiver. novel timing oscillator synchronized household AC frequency wireless real time synchronization also