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By Bill Gunston

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4 Comparison of steady-state noise, reverberation noise and signal amplitude. Ambient noise possesses different characteristics at different frequencies and varies with natural conditions such as rainstorms. Rain hitting the surface of the sea can cause a 10-fold increase in the noise level at the low frequency (approx. 10 kHz) end of the spectrum. Low frequency noise is also increased, particularly in shallow water, by storms or heavy surf. Biological sounds produced by some forms of aquatic life are also detectable, but only by the more sensitive types of equipment.

This system trigger pulse or that from the trigger pulse generator circuit when the chart is switched off, has three functions: ᭹ ᭹ ᭹ to initiate the pulse timing circuit to operate the blanking pulse generator to synchronize the digital and processing circuits. The transmit timing circuit sets the pulse length to trigger the 24 kHz oscillator (transmission frequency). Pulse length is increased, when the deep range is changed, by a range switch (not shown). Power contained in the transmitted signal is produced by the power amplifier stage, the output of which is coupled to the magnetostrictive transducer with the neon indicating transmission.

Digital circuits The digital display section contains the necessary logic to drive the integral three-digit depth display, the alarm circuit, and the remote indicators. Pulse repetition frequency (PRF) of the clock oscillator is pre-set so that the time taken for the three-digit counter to count from 000 to 999 is exactly the same as that taken by the paper stylus to travel from zero to the maximum reading for the range in use. The counter output is therefore directly related to depth. When the chart recorder is switched off, the digital processing section and the transmitter are triggered from the processor trigger pulse generator circuit.

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