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CA/CR40/42/50/52 Installation manual Chapter 11

11.11 Basic transducer and cable information

(CA models)

For optimum performance of the Echosounder, the Simrad combi transducers

C38/200 and C50/200 are recommended. These transducers also include a water

temperature sensor. A variety of alternative medium-range transducers is

available for vessels mainly operating in shallow waters and/or where the size of

the transducer is critical.

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 transducer.

In the event where the standard cable is not long enough, up to an additional 10

meters (32 feet) may be connected without affecting the performance of the

system. The cable must be of the same type as the standard cable.

) The CA40/42/50/52 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 CA40/42/50/52 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.

The 1kW output signal from the echosounder is automatically reduced due to the

difference of impedance in the transmitter, which is 75 ohms, and the transducer,

which is 185 to 425 ohms. See section 7.8 Echosounder setup (in the Operator’s

manual) for correct setting for the transducer selected.

The CA40/42/50/52’s transmitter is designed to match Simrad 1kW 75 ohms

high performance transducers described in section 11.11.1 Transducers.

! 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.

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Airmar 300WX Installationshandbuch Seite 23