![]() ![]() And we're all one big happy family, and we're all here together. I, uh, come here, I think, ever since the building, the uh, rather, this dugout was completed." "Ever since it was completed." "Yes, yes." "What time do you come down here?" "Usually about, uh, about an half an hour after the warning has gone." "I like coming down to shelter for I haven't got, got to go to bed so early." "The days in shelter, we've spent a very happy time for Hitler doesn't worry us while we're here." "Can I just say a word to my sister in America? This is Hilda speaking. "You come down here every night?" "Every night, yes. And from this place a broadcast is sent out to America. Here, forty feet down to hoped-for safety, one hundred and twenty persons exist. The table below shows the parent ROC Group for just ⅔ of the 250 CCPs.The air raid shelter tonight, any night. ![]() One of 25 ROC Group HQ issue fallout warnings to the warning districts within their boundary, via the CCP. A small number of warning districts are grouped into a Carrier Control Area (CCA) each with its own police Carrier Control Point (CCP) of which there are 250 countrywide. signalling system for the remote control of public warning devices as an additional feature on the Carrier System WB 400.Ĭountrywide there were 11000 fallout warning points, each with a carrier receiver, spread out amongst roughly 750 fallout warning districts. Planning of the junction network for Stage 1 was substantially completed by the Regions and Directorates concerned. ![]() A radio interference balancing unit was designed for use on lines containing open wire. Extensive field tests were made of the interference from radio stations that may be experienced on the system. Orders were placed for some small items of the equipment, and negotiations were commenced with three transmission equipment contractors on the design for production of the control and exchange equipments. Authority was received for Stage 1 - comprising 2,700 exchanges, 150 control centres and 14,000 subscribers' receivers - to be completely installed by March 1962. ![]() The system was coded Carrier System WB 400. Redesign of the circuits to employ transistors was completed in the year under review. The E-I-C 1959 / 60 Report, shows that progress was now being made. Further attention has also been given to the design of testing equipment. The design of the equipment has been modified to provide for the simplification of the facilities offered, improved performance (particularly with regard to quality of received speech) and the use of dry batteries instead of secondary batteries to operate subscribers' receiving equipment in the event of failure of the mains power supply. The field trial showed a number of ways in which the design of the equipment could be improved and further development work has been undertaken. On completion of the operational trial, the subscribers' receivers were recovered but the exchange equipments at 29 exchanges were kept in operation and have been tested at three-monthly intervals a number of receivers were also put on life test. During this period, operation of the trial was under control of the Home Office who arranged for test messages to be sent out twice daily. The field trial of equipment designed for distributing civil defence messages over working audio junctions and local lines was completed at the end of August 1953, after a successful run of 14 weeks. The E-I-C 1952 / 53 Report, details the results of the "Carrier Wire Broadcasting System for Civil Defence" trial. ![]()
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