SUBSCRIBER'S DEVICE OF SHIP'S LOUDSPEAKER COMMUNICATION Russian patent published in 1995 - IPC

FIELD: communication equipment. SUBSTANCE: subscriber's device of ship's loudspeaker communication has case housing differential systems with first inputs to link to subscriber's lines through commutation cells, with second inputs to connect to water-proof microphones through corresponding microphone amplifiers and with third inputs to link to water-proof loudspeakers through corresponding line amplifiers as well as light-emitting diodes, resistors and storage battery. Each communication cell is manufactured in the form of prismatic recession in case, it incorporates two hermetically sealed reed relays with permanent magnet connected and positioned in opposition and potted with cold hardening compound. One pair of unlike contacts of hermetically sealed reed relays is coupled to first input of proper differential system and through one pair of light-emitting diode and resistor connected in series - to plus of storage battery. First make contact of one of hermetically sealed reed relays is connected to minus of storage battery and second make contact of another hermetically sealed reed relay is linked to plus of storage battery through pair of light-emitting diode and resistor connected in series. Permanent magnet is built-in microphone case. EFFECT: enhanced reliability of ship's communication. 3 dwg