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Aviation History
1947
1947 - 1740.PDF
4I2 FLIGHT OCTOBER 9TH, I947 AVIATION EQUIPMENT AT RADIOLYMPIA Communication Sets, Navigation Aids and Radar for Commercial Users and Private Owners AFTER the S.B.A.C. exhibition at Radlett, the civilaviation enthusiast will probably find Radiolympia a, little disappointing. This is inevitable in an exhibitionwhich has to cover such a wide field even when there is a special section devoted to electronic applications. However,for those who were not lucky enough to visit the S.B.A.C. show, there are quite a few items of interest. The Ministry of Civil Aviation have an exhibitshowing the way in which air traffic is controlled over the South-East Flight Information Region ofthe United Kingdom. Unfortunately, the stand is so arranged that it is extremely difficult formore than a few visitors to see at one time what is going on. The Ministry of Supply have a standdemonstrating some of the wartime developments in Radar which may find application in peacetime.There is a skiatron tube which is used for daylight viewing, and a simulated H2S airborne Radar isdemonstrated. There is no airborne search Radar on show in the exhibition although a set is underdevelopment by one manufacturer, but the Ministry of Supply exhibition will give an ideaof the results which can be obtained from this type of equipment. Dealing first with the communication equip-ment, there are several items of interest both to the private flier and the airline operator. Murphy Radio andthe G.E.C. are showing their single channel V.H.F. lightweight transmitter/receiver, both of which are compact enough to A view of the M.C.A. stand taken from the wings. A plot was kept of aircraft movements in the S.E.F.I.R. as at Uxbridge, but the representation was of an airport control room. The public had difficulty in either understanding the procedure or even viewing properly the exhibit. be stowed away in a light aircraft. The specification of thetwo sets is very similar, the transmitter output being of the order of £ watt and the receiver having a sensitivity of a fewmicrovolts. Tests on these sets have shown that ranges of 20 to 30 miles or more can be obtained in suitable circum-stances. The G.E.C. jnodel is made up into a single unit Rebecca Mk IV as shown on the E.M.I, stand. It is suitable for homing and blind approach with Babs Mk II, Marconi A.D. 97 low-powered HF/MF communications set which was originally designed for the Dove. while the Murphy set consists of two units, making it slightlymore bulky. Murphy Radio also manufacture a M.F. set for light aircraft application the general form of which is similarto the V.H.F. model. The G.E.C. have a H.F. transmitter/receiver which is suit-able for civil transport aircraft; the transmitter, which has six crystal-controlled channels covering band 2-9 Mc/s, hasan output of 25 watts; the receiver covers the range between 2 and 20 Mc/s but is not crystal controlled. Multi-channel Sets Standard Telephones and Cables have on view their twomulti-channel sets, the STR9 with four channels, and the STR12 with 12 channels. The former set is an adaptation ofthe TR1520 which was developed for the Royal Air Force and is fairly conventional in design. The STR12 is a new develop-ment using bandpass circuits, for which no retuning is required when changing channels. All the necessary crystals,which are miniaturized, and associated apparatus are contained in the pilot's control unit and channel selection is reduced tothe turning of a single switch. The appropriate crystals, 24 in all (12 transmitter, 12 receiver) are plugged in and nofurther adjustment is necessary. The power output of the STR9 -transmitter is 4 watts, and of the STR12 2^/itwatts, both adequate for communication over ranges likely to be required.
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