Discussion
Consider the following statements about the underwater locator beacon:
1. It transmits an acoustic pulse at 37.5 kilohertz.
2. It is activated by immersion in water.
3. It transmits on 406 megahertz for satellite detection.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
The first two are correct: the beacon emits an acoustic pulse at 37.5 kHz and is activated by immersion in water, a simple contact switch with no logic to fail.
The third confuses it with an emergency locator transmitter. 406 MHz is a radio frequency for satellite detection, and radio does not propagate through sea water at all - which is the very reason the underwater beacon is acoustic rather than radio.
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