Wireless-World-1967
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DOMESTIC TECHNIQUES OCTOBERThree Shillings 1967 Wireless World OCTOBER, 1917 or your circuit, with built-in ripp,11 assembled units courtesy of South London Electrical Equipment Co. Ltd. We've got the biggest little chassis in town SAVE TIME & MONEY with precision -built Keyswitch optional Keyswitch printed -circuit board withits I plug-in chassis. They're the ideal way to put a hand- mounting -hole grid backed by interconnecting cop- ful of circuitry together, and not necessarily a small per strips, you have an infinite variety of circuit and handful either. Even relays and small motors can be layout possibilities. And all this for as little as 15/- a mounted in these versatile units. Here's your choice time, from Keyswitch Relays Ltd, 120 Cricklewood of mounting space: Lane, London NW2; telephone 01-452 3344; telex Keyswitch P304S - 51i n3 262754. Keyswitch P304 (illustrated) - 71in3 Keyswitch 2P304 (with 44 -way connectors) - 15in3 milkilTMITVITCH1RELAYS Whether you use your own mounting board, or the WW -001 FOR FURTHER DETAILS -79 Editor -in -chief: Wireless World W. T. COCKING, F.I.E.E. Editor: H. W. BARNARD ELECTRONICS, TELEVISION, RADIO, AUDIO Technical Editor: T. E. IVALL OCTOBER 1 9 6 7 Editorial: B. S. CRANK 463 What is the Electronics Industry? F. MILLS 464Domestic Receiver Techniques G. B. SHORTER, B.sc. 472Stereo Signal Simulator by D. E. O'N. Waddington 476 Drawing Office: Colour TV Standards Converter H. J. COOKE 482 Semi -stabilized D.C. Supply by G. W. Short 483German Colour Television Starts Proauction: 488 Wireless World Digital Computer -3 D. R. BRAY 496 New Measurement Techniques Advertisements: 500 Colour TV Circuit Round -up by T. D. Towers G. BENTON ROWELL (Manager) J. R. EYTON-JONES SHORT ITEMS 470R.S.G.B. Show Iliffe Technical Publications Ltd., 471 BBC -2 Reception Managing Director: Kenneth Tett EditorialDirector :George H. 471 Stroboscopic Hologram Interferometry for Transducers Mansell 475 Temperature Compensation Method for Oscillators Dorset House, Stamford Street, London, S.E.1 495 Manchester Electronics Show 498 Bistable Resistors Subscribers arerequestedto 505Component Specifications notify a change of address four weeks in advance and to return wrapper bearingpreviousad- REGULAR FEATURES dress 463 Editorial Comment 499 World of Amateur Radio © llifle Technical Publications 478 World of Wireless 506 Letters to the Editor Ltd., 1967. Permission in writing 480 Personalities from the Editor must firstbe 509 News from Industry obtainedbeforeletterpressor 482 Books Received illustrations are reproduced from 510New Products this journal. Brief extracts or 487 October Meetings comments are allowed provided acknowledgement to the journal 494Books Received 516Conferences and Exhibitions is given. 495 Literature Received 516 H.F. Predictions VOLUME 73 No. 10 PUBLISHED MONTHLY (3rd Monday of preceding month). Telephone: 01-928 3333 (70 lines). PRICE: 3s. Telegrams/Telex: Wiworid Iliffepres 25137 London. Cables: ''Ethaworld, London, S.E.1." Annual Subscriptions: Home; £2 6s Od. Overseas; £2 15s Od. Canada and U.S.A.; $8.00. Second -Class mail privileges authorised at New York N.Y. BRANCH OFFICES: BIRMINGHAM: 401, FIFTY-SEVENTH YEAR Lynton House, Walsall Road, 22b. Telephone: Birchfields 4838. BRISTOL: 11 Marsh Street, 1. Telephone: Bristol 21491/2. COVENTRY: 8-10, Corporation Street. Telephone: Coventry OF PUBLICATION 25210. GLASGOW: 123, Hope Street, C.2. Telephone: Central 1265-6. MANCHESTER: 260, Deansgate, 3. Telephone: Blackfriars 4412. NEW YORK OFFICE U.S.A.: 300 East 42nd Street, New York 10017. Telephone: 867-3900 OCTOBER,1967 SO WIRELESS WORLD 0.K! -soyou're not a patient... only when you have been seriously ill yourself do you realise theRadio Telephones, Mobile importance of immediate communication. It may only bring simpleAir-to-Ground,Long Distance & re-assurance-it can mean the difference between life and death. Hospital Communications. G.E.C. have a communications system for every need, not the least ofClosed Circuit Television. which is G.E.C. Nurse Call, a simple bed -side system easily operated byRemote Control & Supervisory Systems. children or the chronic sick. Particularly if you are connected with hospital administration, youCommunications should know more about Nurse Call. Ask G.E.C. about it today. G.E.C. systems are adaptable to industrial or commercial use whereDivision instant communications are essential. Could you use such a system ? G.E.C. Communications-increasing efficiency, he/ping the community. Electronics Information Centre, G.E.C. (Electronics) Limited, Communications Division, Spon Street, Coventry Telephone : Coventry 24155. A subsidiary of the General Electric Company Limited, of England WW -108 FOR FURTHER DETAILS. Wireless World ELECTRONICS, TELEVISION, RADIO, AUDIO What is the Electronics Industry? THIS, strangely enough, is the question posed by the Economic Development Com- mittee for the Electronics Industry, in its recently issued survey of the industry's statistics.This is no new question.Indeed, on more than one occasion during the past fifteen or twenty years we have sought to define "electronics."At one time the generally accepted definition was " radio -like techniques and devices, especially valves, applied to non -communication purposes," but electronics, the child of the radio family, has now grown to maturity and the offspring's name has, by common usage, become the family name. However, to get back to the E.D.C's question, the definition of an industry is essen- tially arbitrary. Among the criteria which can be used as the basis of a definition are " the physical nature of the product; the technology used in production; or the need which the product meets."Sometimes these criteria coincide and the defining of the industry is not difficult.However, where, as in electronics, "a technology is advancing rapidly and spreading its influence widely" giving a clear definition of the industry concerned is particularly difficult.The E.D.C. survey points out, that because some car ignition systems use semiconductors no one would suggest that this makes a car an electronic product.Similarly the electronic distributor, probably made by a motor accessory manufacturer, is unlikely to be regarded as an electronic product. Although, so far as the Government is concerned, any definition is arbitrary, and would appear from the report to be made primarily for the purpose of statistics, "it will tend to change as technology and industrial structure change." The present "mini- mum list headings " (M.L.H.) of the Government's " standard industrial classification " defining the electronics industry are (a) valves, (b) consumer goods, (c) capital goods, and (d) components.* The E.D.C. also includes telegraph and telephone apparatus in the industry. According tcthe latest survey " no precise definition of the electronics industry has ever been accepted by the E.D.C." and it is now proposing a major regrouping. First there would be one M.L.H. for the components sector of the industry with three sub -divisions: active and passive components and microcircuits.It is stated that "the microcircuit sector is included in case by the time of the next census or the one after a substantial number of establishments making these circuits exist independently as off -shoots of both active and passive component (or other) firms."Secondly, there would be one M.L.H. for each of the main product sectors-capital goods, telephone equipment, and consumer goods.Lastly an M.L.H. for " the rather small but mixed sector of firms making audio products and components." It may well be that integrated circuits (l.s.i. devices particularly, which combine active and passive component manufacture, assembly and testing) will provide a unifying influence on the whole industry.It is blatantly clear that the number of i.c. manu- facturers is going to be small but their influence could be very extensive. One other aspect of the past industrial structure hasbeen a proliferation of trade associations, each one speaking for a particular sectionwithout an effective co-ordina- ting body bringing together the various sectors of theindustry. rectifiers; (b) radio and television receivers and sound * (a) valves, c.r.ts. semiconductors and electronicgramophones, gramophone records and tape recordings; reproducing and recording equipment including communication receivers, radar and electronic VOL 73 NO 10 (c)capital goods-radio and television transmitters, navigational aids, electronic computers, industrial electronicequipment, electronic medical equipment, high -frequency heating apparatus, electronic testingand measuring equipment, X-ray apparatus, etc.; OCTOBER and (d) components, including resistors, capacitors,inducers, circuit breakers for electronic equipment, 1967 sound reproduction components, printed circuits, etc. 463 WIRELESS WORLD, OCTOBER 1967 Domestic Receiver Techniques Developments incircuitry and construction seen at recent trade shows in London SOUND RECEIVERS AFTER looking round the trade shows at domestic coaxial cable (32 in).This set's brother (Pye 1372, radio receivers the feeling that one has seen it all Ekco PT304, Ferranti 5501) isa v.h.f., medium- and before becomes very strong. The development of long -wave version that does not include the r.f. amplifier. sound radio in Britain has to a large extent been over- The sets retail at 16gn and £20 9s, respectively. shadowed by that of colour television, manufacturers Incorporating one of the features suggested in the having concentrated