1-2
JLN-900Acoustic Correlation Dual Speed Log
System Description
The system measures one-axis relative speed as well as two-axis bottom track speed in a
combined transducer.
In the JLN-900 the speed log device for STW (Speed Through the Water) is separated from
the speed log device for SOG (Speed Over the Ground).
The data obtained from the JLN-900 are:
a) Longitudinal bottom track speed (= SOG longitudinal)
b) Transverse bottom track speed (= SOG transverse)
c) Longitudinal water track speed (= STW)
d) Docking log (if an optional Rate-of-Turn Gyro is connected to the system)
e) Depth information (= DPT)
Sig.Distributor
Sig.Distributor is mounted on the bridge and receives the NMEA message from the
Sig.Processor. The Sig.Distributor has various options to perform message conversion and
calculations and has also a variety of inputs for taking data from other units. Outputs available
are serial (NMEA), relay contacts, opto-couplers and analogue output. The Sig.Distributor
can also take data from a connected turn-rate gyro. If the docking log option in the
Sig.Distributor is enabled, the data from the log and the gyro are combined to create also
docking log information that can be used by the docking log display .
MainDisplay
NWW-82 Main Display are versatile instruments used primarily as a display to indicate speed,
distance and depth. It can also be used to remotely control such equipment, which is not easily
accessible or has no user interface, for example a Sig.Processor, Sig.Distributor.
Transducer
The combined transducer is mounted in a sea valve arrangement suitable both for single and
double bottom design. The transducer incorporates as standard a 30 metres cable for
connection to the Sig.Processor. Both speeds and depth are measured with this single,
combined transducer that is equipped with separate crystals for bottom track measurement (5
off) as well as for water track measurement (2 off).
To Next Page
Loading...