Development of Sydney, Nova Scotia-St. John's, Newfoundland Canadian National Telegraphs Microwave System

A 650-mile radio-relay system composed of 22 "lineof-sight" paths was constructed to supplement the Canadian National Communications between Sydney, Nova Scotia, and St. John's, Newfoundland. Relay repeater points were chosen by means of all available contoured maps and on-site surveys of the various points, bearing in mind radio transmission characteristics and also accessibility for maintenance. All the radio paths were field-tested to confirm their transmission capabilities. The overwater hop between Cape North and Red Rocks, which is 69 miles long, required careful consideration, and special arrangements were made to ensure that this hop would provide a satisfactory performance. Standard Telephones and Cables Ltd.,were requested to provide this system using their latest equipment. This is 5-watt equipment working on 4000 Mc and able to carry the equivalent of 600 toll quality message circuits or one video program. To handle the present Canadian National requirements, three channels were installed in an eastward direction and two in a westward direction. The system is divided into three sections with back-to-back terminals at Corner Brook and Gander for general communications and television branching circuits. Each section has a separate comprehensive supervisory control facility for providing dual information and controls at both section terminals.