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JRC Doppler Log Instruction Manual JLN-205Mk2


Year: 2013
Language: english
Author: JRC
Genre: Manual
Publisher: JRC
Edition: 1
Format: PDF
Quality: eBook
Pages count: 92
Description: The JRC Model JLN-205MK2 Doppler Log is an equipment for measuring accurately
the true speed and run of a ship, utilizing the Doppler shift of ultrasonic signals, which
are radiated from a trnsducer into sea water downward obliquely to the bow and stern
sides, then scattered and reflected in the sea water. The transducer is mounted on the
hull bottom.
This equipment measures a relative speed to seawater from the hull bottom within 3m.
Therefore, ship’s speed corresponding to the output of a main engine can be obtained
without containing the speed such as the currents. The ship’s speed error margin
caused by the change in the water line doesn't occur because the transmission and the
reception of the pulse are done, and it excludes the signal in the vicinity of the bottom of
a ship. Moreover, because the dual beem method to launch the ultrasonic wave signal in
two directions (fore and aft) is adopted, the ship’s speed error margin because of the
change in the trim is greatly reduced.
This equipment offers measured information to other equipment such as radar and
ECDIS.

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