76 



THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1951 



noise and crosstalk might be picked up. In Havana the last repeater is located 

 in a large vault on the beach. At Key West the last repeater is located close 

 to Sand Key Light where the water begins to deepen. 



70 



65 



60 



55 



I 50 

 O 



UJ 



O 45 



Z 



•7 40 



35 



30 



25 



20 



2.4 



S 2.0 



O 



UJ 



^p,.2 



Ouj 



o 

 z 



Ui 



0.6 



0.4 



20 30 40 50 60 70 80 90 100 110 120 

 FREQUENCY IN KILOCYCLES PER SECOND 



Fig, 7 — Gain characteristic of repeater. 



O.I 



0.2 



0.4 0.6 1.0 2 4 6 8 10 20 40 60 



FREQUENCY IN KILOCYCLES PER SECOND 



200 



Fig. 8 — Attenuation frequency characteristics — Key West-Havana Cables. 



At manholes near the shore at both ends the cables are spliced directly to 

 underground cables running in ducts to the terminal equipment at the offices, 

 a distance of three miles at Havana and one mile at Key West. The under- 



