Repeater design for the Newfoundland¿Nova Scotia link

The Newfoundland-Nova Scotia link required the provision of 16 submerged repeaters each transmitting 60 circuits in the bands 20¿260kc/s from Nova Scotia to Newfoundland and 312¿552kc/s in the opposite direction. The paper deals with the design and production of these repeaters. Each repeater has a gain of 60 dB at 552 kc/s and the amplifier consists of two forward amplifying paths with a common feedback network. Reliability is of paramount importance, and production was carried out in an air-conditioned building with meticulous attention to cleanliness and to very rigid manufacturing and testing specifications. The electrical unit is contained in a rigid pressure housing 9ft long and 10in in diameter with the sea cables connected to an armour clamp and a cable gland at each end. A submerged equalizer was provided near the middle of the sea crossing.