PURPOSE: To easily attain a calling even during the underwater work apt to restrict an action by attaining a calling and a talking only by operating one push-button switch at the time of the underwater work such as scuba diving.
CONSTITUTION: When a push-button switch 9 of a calling transmission controller 8 continues to be pushed since a diver calls, feeding is executed respectively to a calling signal generating circuit 5, an AF amplifier 2, a modulating circuit 3 and a carrier generating circuit 6, and from an ultrasonic echo sounder transmitter 4, the modulated calling signal is discharged. On the other hand, when the push-button switch 9 is released after it is pushed once, the sending of the calling signal is stopped, a feeding to respective circuits to except the above- mentioned calling signal generating circuit 5 is started and the voice is sent. Thereafter, when the push-button switch 9 is depressed one more time, the power supplying to the AF amplifying circuit 2, the modulating circuit 3 and the carrier generating circuit 6 is stopped and the voice sending is stopped.
UCHIDA SHIRO
SUZUKI KENICHIRO
AMIKURA HIROKAZU
