Cable 



The underwater cable consists of three twisted 

 pairs, one pair covered with a shield, and the group of 

 three pairs covered with an overall shield. The two shields 

 are tied to each other at only one end of the cable. The 

 cables were procured in lengths of 50, 500, and 1000 feet. 

 Two types of cable, nonbuoyant and buoyant, were available. 

 Their electrical characteristics are identical. The non- 

 buoyant cable has a neoprene jacket with an OD of 0. 440 

 inch. The cable connectors used are Marsh and Marine's 

 XSL-6-CCR and XSL-6-CCP, one at either end, connected 

 as shown in figure 7. A separate return lead was used for 

 the calibration circuit to minimize common-mode voltages 

 when long cables are used. The buoyant cable is similar 

 but with a thinner neoprene jacket and an added flotation 

 jacket of foamed polyethylene for a slight positive buoyancy 

 in seawater. 



OVERALL SHIELD 



SIGNAL 



PAIR #1 AND SHIELD 



COMMON 



CCR 



PAIR #2 



CCP 



Figure 7. Diagram of hookup of cable conductors and shields to Marsh and 

 Marine connectors XSL-6-CCR and XSL-6-CCP. 



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