Birmingham BT EXCHANGE BUNKER Lydon Green

Known to BT as Lyndon Green TRS (telephone repeater station) or Birmingham/G, this building is one of the handful of protected repeater stations constructed during the Cold War period. Its life as a functioning BT building had ceased.

Lyndon Green was known technically as a PR1 (protected repeater station, type 1), comprising a two-level bunker with heavy blast doors. It is semi-sunken, with the main distribution frame and active equipment on the ground floor and power plant and ventilation system in the basement below ground.

It is located in an island site between the Coventry and New Coventry Roads at Sheldon, where the west and eastbound carriageways of the A45 road diverge, some distance south-east of the locality known as Lyndon Green. The postal address is 53 New Coventry Road but there are gates into the repeater station yard from both roads.

Repeater stations were locations where the signals on telephone cables were amplified to counteract the electrical losses that tend to make speech fainter. The majority of repeater stations were located at intermediate places between telephone exchanges. Lyndon Green is on one of the main trunk telephone (and television) cable routes between London and Birmingham, having a number of important circuits passing through it. It was constructed at a time when all repeaters (amplifiers) used thermionic valves (vacuum tubes), which required far more electrical power than the solid-state amplifiers of today. Accordingly the repeater station had a substantial power plant, with its own electricity substation, a large generator (removed some years ago) and storage batteries. The station had equipment stores, a test desk, repair workshop and eating/recreation facilities.


https://www.subbrit.org.uk/sites/lyndon-green-bt-repeater/

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