Radio wave sound and recording alarm system - uses tape recorder and transmitter and receiver producing alarm signal

摘要

The radiowave sound and recording alarm system is supplied from a system with a known type detection circuit. It uses a tape recorder on which has previously been recorded an alarm message, as well as a transmitting unit which transmits the message to a receiver having the name frequency and impedance as the transmitter. The recorder and multistage transmitter together with a battery supply source are housed in a sealed isophonic container (1). The battery supply circuit is connected to the transmitter and recorder by the detection circuit.