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SWM-1955-02.Pdf VOL. XII FEBRUARY, 1955 WORLD WIDE COMMUNICATION Ll THE SHORT WAVE MAGAZINE February, 1955 H. WHITAKER G3SJ IO YORKSHIRE STREET, BURNLEY Phone 4924 Manufacturers of precision Quartz Crystals in a wide variety of bases covering the complete range 50 Kc. to 18 Mc. in fundamental frequencies. All are made to extremely fine tolerances, and frequency adjustment can be given up to .005%. Plated electrodes of gold, silver or aluminium with wired in spot welded contacts are available. Quotations can be given for any type of cut or mode of oscillation including a complete range for filter circuits with zero temperature co -efficient over a sensibly wide temperature range. Our new works is equipped with up to the minute production technique methods, X-ray orientation ensuring accuracy of all cuts. Artificial aging by etching and plating by evaporation under vacuum ensure long term stability of the final calibration. Early delivery can be given of most types. Our regrind service is still available and in some cases we are prepared to quote for lowering the frequency of your existing crystals. Special Offer: 200 kc. DT cut, zero temperature co -efficient over the range - 30° centigrade to + 55° centigrade. Frequency adjustment .005% or better. Mode : Face shear. Silver plated electrodes, wire mounted. Basing Z" pin spaced. Other bases to order, £I each. BROOKES rix.fi'aeS mean DEPENDABLE frequency control Illustrated above The World's Finest Commercial is a Type OB Crysta: ALL Brookes Crystals are made to exacting unit with a frequency standards and close tolerances. They are range of 50-110 kc/s. available with a variety of bases and in a 2 METRE CONVERTER Frequency Tolerance wide range of frequencies. There is a Brookes us have rush of ± .005% of nominal Crystal to suit your purpose-let sets a new standard of performance which will bring a at 20°C. your enquiry now. enthusiasm to both new and experienced V.H.F. operators alike. Send S.A.E. for illustrated leaflet to : Brookes Crystals Ltd Labgear (Cambridge) Ltd. OD Suppliers to Ministry of Supply, Home Office, BBC, etc. BROOKES 181 /183 TRAFALGAR RD., LONDON, S.E.10 WILLOW PLACE, CAMBRIDGE Tel. GREenwich 1828. Grams: Xtals Green London. Volume X11 THE SHORT WAVE MAGAZINE 641 i . 0 1Lec.c..s,con EIECT/2ICAt TESTIMG 111A151R1111MEIrTS A dependably accurate instrument for testing and fault location is indispensable to the amateur who builds or services his own set. Stocks are now available of these two famous "Avo " Instruments. If you have any difficulty in obtaining one locally, please send us the name and address of your nearest Radio Dealer. THE UNIVERSAL AVOMINOR A small but highly accurate instrument for measuring A.C. and D.C. voltage, D.C. current, and also resistance. It provides 22 ranges of readings on a 3 -inch scale, the required range being selected by plugging the leads supplied into appropriately marked sockets. An accurate moving -coil movement is employed, and the total resistance of the meter is 200.000 ohms. The instrument is self-contained for resistance measurements up to 20,000 ohms and, by using an external source of voltage, the resistance ranges can be extended up to 10 megohms. The ohms D.C. VOLTAGE A.C. VOLTAGE compensator for incorrect voltage works on all 0-75 millivolts 0-5 volts ranges. The instrument is suitable for use as an 0-5 volts 0-25 output meter when the A.C. voltage ranges are 0-25 0-loo ., being used. 0-100 0-250 ,. 0-250 0-500 ,. 0-500 Size : 4ains. s 3bins. x I fins. Complete with .leads, inter - RESISTANCE Nett weight: 18 ozs. changeable prods and croco- D.C. CURRENT 0-20,000 ohms dile clips. and instnu lion 0-2.5 milliamps 0-100,000 Price £10 : 10:0 book. 0-5 0-500,000 0-25 0-2 megohms 0-100 .. 0-5 0-500 0-10 ,. THE D.C. AVOMINOR CURRENT A conveniently compact 2k -inch 0- 3 milliamps moving coil precision meter for 0- 6 making D.C. measurements of 0- 30 0-120 milliamps, volts and ohms. The VOLTAGE total resistance of the meter is 0- 6 volts. 100,000 ohms, and full scale de- 0- 12 flection of 300 y. or 600 v. is 0- 60 0-120 obtained for a current consump- 0-300 tion of 3mA. or 6mA. respectively 0-600 RESISTANCE Size : 4¡ins. x 3}ins. x bins. 0- 10,000 ohms Neu weight : 12 ozs. 0- 60,000 0-600,000 Complete as above. 0-3 megohms Price : £5 : 5 :0 Complete descriptive Booklet available on application to the Sole Proprietors and Manufacturers: THE AUTOMATIC COIL WINDER & ELECTRICALÉQUIPMENT CO. LTD. WINDER MOUSE DOUGLAS STREET - LONDON s /e i''K/ VIc te.. 7r0e-9 i 642 THE SHORT WAVE MAGAZINE February. 1955 A GUIDE TO THE LARGEST AND MOST VARIED STOCK AT RADIO -----------WEBB'S - - - --- EVERYTHING FOR THE / SMALL COMPONENTS IN GREAT HOME CONSTRUCTOR VARIETY BY from Resistors, Condensers and BULGIN - ERIE - WELWYN - T.C.C. similar " Odds and Ends," / COLVERN - WODEN - WEARITE to complete Test Gear and / DUBJTJRR - BELLING & LEE Communication Receivers. / EDDYSTONE - _- up to the G.E.C. / \ and all that is Best in. B.R.T_400D' at £185. / British Manufacture Have a look at Webb's Extended "easy" payments arranged side window for on any apparatus totalling EIS or " Clearance Sale " more. Bargains. MAIN LONDON DEALERS FOR EDDYSTONE always The complete range 14 SOHO ST., OXFORD ST., LONDON, W.L. stock. available from Phone : GERrord 2089. Shop:Hours : 9 o.m.---5.30 p.m.' Sots. .9 a.m.--f p.m.. <11.1009) ó e. crown A wide range of capacities and types for both trans- 1 formers and chokes. Absolute al'C AUDIO AIDS reliability owing to vacuum impregnation and special compound filling. Suitable for Headphones with indivi- exacting industrial and clima- volume tic conditions. Neat and clean dual control. appearance in equipment. Ideal for use with church and cinema deaf aid installations or for individuals with impaired hearing. They provide the essential clarity of reception when listening to Radio and T.V. Woden shrouded trans- Send for Brochure formers have been developed to give a competitive pro- ' S' of all types duct combined with a first- If desired, class engineering ¡ob. Finest available. quality materials used advice is given on , throughout ; vacuum drying and vacuumlpressure im- selection of type most pregnation, rigidly tested. suited to individual needs. A popular, highly competitive line. S. G. Brown provide Headphones and asso- ciated equipment for all known purposes. M ODEN TRANSFORMER CO., LTD. MOXLEY ROAD BILSTON . STAFFS SHAKESPEARE STREET, WATFORD, HERTS Tel : BILSTON 41959 Telephone : Watford 7241 SMJW 2098 141 Volume X11 T H E SHORT WAVE MAGAZINE 643 Could you use an R.A.F. receiver at home? Can ydu receive Morse at 20 words a minute? Can -and the upper age limit does not apply. In either you operate a radio receiver and carry out minor case the work involved is a programme of 16 one - servicing? Would you like to use an R.A.F. set at hourly periods each month, for which the R.A.F. home? Then you're just the man the R.A.F. Voluntary loans you a receiver. Both service members and Radio Service is looking for. civilians receive an allowance to cover the cost of This Service is designed to enable you to keep your upkeep of the set, and in addition. R.A.F.V.R. hand in, and to provide the R.A.F. signals organisation members receive an annual bounty. The initial period with a reserve in time of war. And except for an of service is five years with the prospect of future evening meeting once every three or four months, all re -engagement. this part-time service is done at home. If you're a 20-word -a -minute -man and keen to keep It works like this. If you are between 18 and 45 and your hand in during your spare time, write for details have no other reserve or auxiliary training obligation, of the R.A.F. Voluntary Radio Service to: you are enlisted in the R.A.F.V.R. if for some reason you are unable to join as a service member but are still keen to give a hand, you can join as a civilian member Air Officer Commanding -in -Chief, VOLUNTEERS. WHO MUST BE BRITISH H.Q. Home Command (P.15 (c) ), SUBJECTS, ARE REQUIRED IN ALL AREAS OF ENGLAND, SCOTLAND AND WALES. BUT Royal Air Force, White Waltham, EXCLUDING ISLE OF MAN. Nr. Maidenhead, Berks. 644 THE SHORT WAVE MAGAZINE February, 1955 LYONS RADIO LIMITED P.C.A 3, Goldhawk Rd., Shepherds Bush, London, W.12 Dept. MS. Telephone : SHEPHERDS BUSH 1729 METAL MINE DETECTOR UNITS, No. 3. We have once again been able to secure another small supply of these units which give warning of the presence of metal objects in water, timber, underground, etc. There are probably many applications for which this equipment can be used in addition to its original one. gatnobile Electricity, Water and Gas Cós., Timber Merchants and Post Office departments are amongst chose we have so far supplied. The equipment is complete (less batteries, which if desired we can supply as an extra) in strong wood transit case. The principal items are : an A.F. amplifier employing 3-ARPI2 (VR23) valves Mobile mounted with battery space in metal case I I x 11 x 44ins., search coils, control box pole front and rear sections, high resistance headphones and carrying satchel.
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