Unit installation

FS70 Trawl Sonar System
38 974-24007001/4.1
4.2.14 Connection to Cable Winch/Slip-Rings
The connection between the FS TTM Interface unit and the cable
winch/slip-rings should be made with a 12AWG or heavier,
shielded pair cable. The connection to the control unit is made using
the 3-pin MS connector supplied in the TTM module accessory kit.
To minimize noise interference on the cable, the shield of the cable
should be attached to the connector.
NOTES:
1. The shield of the cable between the FS TTM module and the
slip-rings should be connected at the TTM module, but NOT
at the slip-rings.
2. Based on experience from previous installations, good
results were achieved using a section of your 3rd wire cable
for this connection.
4.2.15 Assembling of the Trawl Unit
Assembling the trawl unit for the first time should be conducted in
the wheel house where the surface unit electronics have been
mounted. This will facilitate testing the trawl unit using the test
cable.
4.2.16 FS 70 Configuration
The FS 70 trawl configurations all consist of an FS 70, 120 kHz or
330 kHz vertical sonar head with a 200 kHz echo sounder, an FS 70
sensor module is integrated in the trawl sonar head. The FS 70
polyurethane housing includes mounting and assembling hardware
and a strain relief. The trawl unit also contains a catch receiver unit
and the echo sounder transducer. Assembly of the unit involves
correctly locating the sonar head, attaching the strain relief to the
trawl cable, proper routing and connection of the cable to the sonar
head and bolting the polyurethane housing together. This section
describes the connection and location of the sonar head, echo
sounder transducer and catch receive transducer. Final assembly is
illustrated in the “Drawings” section.