UNDERWATER ELECTROMAGNETIC COMMUNICATION SYSTEM Russian patent published in 2003 - IPC

FIELD: underwater communication means using electromagnetic waves. SUBSTANCE: surface station has transmitter incorporating microphone, power amplifier, matching device made in the form of double-winding transformer, double-electrode surface antenna, low-frequency filter, crystal oscillator, and keyer, as well as receiver incorporating double-electrode surface antenna, matching device, filter, audiohowler, amplifier, and headphones; underwater station has transmitter incorporating crystal oscillator, keyer, power amplifier, and underwater antenna, as well as receiver incorporating double-electrode antenna, matching device, selector switch, capacitor, audiohowler, narrowband filter, and headphones. EFFECT: enhanced reliability and noise immunity of communication means. 1 cl, 3 dwg