Simrad CX34 NavStation, Installation Manual

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CX34/44/54 NavStation Installation 1 - 23
1.12 Basic transducer and cable information
The installation should be carefully planned in advance, keeping in mind the
standard cable length of 10 meters (32 feet) which is connected to the trans-
ducer. In the event where the standard cable is not long enough, up to an addi-
tional 10 meters (32 feet) may be connected without a noticeable reduction of
the performance. The cable must be of the same type as the standard cable.
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The unit must be turned off while connecting/disconnecting the transducer
cable.
The use of longer cable runs, while possible, always increases the likelihood of
increased interference and decreased performance. Care must be taken when
increasing the cable lengths to ensure that proper, adequate and consistent
shielding is maintained, that cable of adequate cross section is used, and that
all connections are properly made and protected from the effects of the marine
environment.
If possible, running the transducer cable through a grounded conduit will
greatly decrease the likelihood of interference. Likewise, the transducer cable
should be run as far as possible from other electrical cabling. If it is absolutely
necessary to pass close to other cabling, it is best to keep as much distance as
possible, and to make all crossings as close to a right angle as possible.
Only applicable for CX44/54 models:
The CX44/54’s transmitter is designed to match Simrad 1kW 75 ohms high
performance transducers described in section 1.12.1 Transducers.
However, when using a 600 W single element transducer e.g. B744V, the 1kW
output signal from the echosounder is automatically reduced due to the differ-
ence of impedance in the transmitter, which is 75 ohms, and the transducer,
which is 185 to 425 ohms. See Echosounder setup in the CX44/54 operator
manual, for correct setting of the transducer selected.
! Warning!
Transducers containing speed log sensor e.g. Airmar B744V must never be
connected to the port “ECHO2”. To avoid accidental connection, “ECHO2” is
sealed with a small silicone plug, which of course is removable so e.g. a combi
transducer can be connected.