L3 Comminications SERIES 5000 Operation And Maintenance Manual - page 233
D-30
APPENDIX D General Setup, Configuration and Troubleshooting
Series 5000 Sonar System Operations and Maintenance Manual
P/N 11210060, Rev. 13.0
D.6.1 Tow Cable Considerations
For lightweight tow cables, we recommend that you use tow cables with the
following characteristics:
Type:
Polyurethane jacketed, coaxial Kevlar
reinforced
Conductors:
Coaxial copper
Diameter (OD):
1.03 cm (0.405 in.)
Breaking strength:
2270 kg (5000 lb)
Working load:
454 kg (1000 lb)
Operational length:
3000 m maximum, depending on cable
Voltage rating:
600 VDC
Termination:
Stainless steel shackle at towfish end
For armored tow cables, we recommend that you use tow cables with the following
characteristics:
Type:
Double layer, counter helical, galvanized
improved plow steel (GIPS)
Stainless steel can be a special order
Conductors:
Coaxial copper
Diameter (OD):
10.2 mm (0.40 in.)
Breaking strength:
4990 kg (11, 000 lb)
Working load:
1247 kg (2750 lb)
Operational length:
3000 m maximum, depending on cable
Voltage rating:
1200 VDC
Termination:
Stainless steel shackle at towfish end
Other important characteristics to consider are that, electrically, the cable must be
50 ohms. The whole cable assembly, deck cable, slip ring, winch, cable and
connectors must be coax all the way from the TPU to the towfish.
NOTE
The whole cable assembly must not exceed an attenuation of greater
than 24 dB of insertion loss at 15 MHz. We suggest a working loss of 24 dB
at 15 MHz.