November 2012
Intermediate to advanced
1034 pages
53h 38m
English
Content preview from Broadcast Engineer's Reference Book
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Brian Flowers MIEEE,MRTS,MNYASSenior Engineer (retired)European Broadcasting Union
6.8 Intercity Links and Switching Centres
6.8.1 Historical Development
6.8.1.1 Early Intercity Links
The first intercity links for television signals were coaxial cables, which were installed by the GPO (General Post Office) from London to Birmingham, then on to Manchester, and from London to Cardiff, between 1950 and 1952. A special 1-inch diameter coaxial cable was used for the London to Birmingham circuit, whereas standard 3/8-inch telephony coaxial cables were used for the other two circuits. Repeaters were installed every 12 miles for the 1-inch coaxial cable, and every 4 miles for the 3/8-inch coaxial cables, to equalise and amplify the signals. ...
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