The block diagram explaining the device and operation of the sonic depth finder, is shown on fig. 1. The clock G1 generator operates interaction of knots of the device and provides its work in an automatic mode. Generated by it short (0, 1 c) rectangular impulses of positive polarity repeat each 10 pages. The front these impulses establish the digi
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tal PC1 counter in a zero condition and close the A2 receiver, doing it tolerant to signals on transmitter operating time. Recession the clock impulse starts the A1 transmitter, and the radiator sensor of BQ1 radiates in the bottom direction short (40 microsec) an ultrasonic probing impulse. The electronic key of S1 at the same time opens, and fluctuations of exemplary frequency of 7500 Hz from the G2 generator arrive on the digital PC1 counter. Upon termination of operation of the transmitter the A2 receiver opens and gains normal sensitivity. Ekhosignal reflected from a bottom, is accepted by the BQ1 sensor and after strengthening in the receiver closes S1 key. Measurement is finished, and indicators of the PC1 counter highlight the measured depth. The next clock impulse transfers again the PC1 counter to a zero condition, and process repeats. the Schematic diagram of the sonic depth finder with a limit of measurement of depth to 59, 9 m is represented by p on fig. 2. Its transmitter represents the duple generator on transistors VT8, VT9 with the T1 transformer adjusted on working frequency. Necessary for generator self-excitation positive feedback is created by R19C9 and R20C11 chains. ` The generator forms impulses duration of 40 microsec with radio-frequency filling. Operation of the transmitter the modulator consisting of the one-vibrator on transistors VT11, VT12, forming modulating impulse duration of 40 microsec,...
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In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
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