Radio Relay Services

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    Abstract

    RADIO relay is much more common abroad, where it is regarded as a public service, than in Great Britain. In a pamphlet written by G. S. Lucas and E. S. Hall of the Research Department of the British Thomson-Houston Co., Ltd., a description is given of the radio relay equipment built and designed for the Midland Relay Services, Ltd. It is suitable for 300 subscribers but could easily be adapted to suit 1,000 or more subscribers. It has four radio receivers with their aerial equipment, and a short-wave receiver. The aerial equipment depends upon the locality and conditions of reception. For the installation carried out at Rugby, two vertical aerials about 25 feet in length are used for local reception. For long-distance work a horizontal aerial 100 feet long and 50 feet high is used. For use on short-wave reception a special V doublet aerial has been installed. Two of the receivers are suitable for B.B.C. transmission and two for long-distance Continental programmes. The advantages offered to the public by this service are the replacement of aerials by simple overhead wires. The installation of only a simple speaker unit in the house is required; no power supply or battery is necessary. The main control station is under constant supervision and the receivers are adjusted for the best working conditions. The radio relay station is capable of relaying two or three independent programmes to all subscribers. All the vital points of the system are duplicated and the organization can deal quickly and effectively with faults and complaints as they arise.

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