FOR RADIO ENGINEERS
RADIO ENGINEERING-VOLUME 1. By E. Sandeman, Ph.D., B.Sc., M.1E.E. Chapman and Hall. HIS is rather different from the usual academic type of text book in that it deals more with the practical application of radio principles to the equipment used in radio broadcasting, and gives a wealth of information on the adjustment and maintenance of such specialised equipment, more particularly that in use at transmitting stations. The author is a prominent engineer on the staff of the British Broadcasting Corporation and he has. developed the book from _ instructions which have been written over the past years for maintenance engineers at BBC transmitting stations. Although an attempt has been made to make it a suitable book for beginners, by logical ex~ planations and the use of a minimum amount of advanced mathematics, this does not detract from its usefulness as a practical reference book for experienced operating and maintenance engineers. The text opens with’ an elementary chapter on "How Broadcasting is Done’ and then proceeds to discuss electrical units and the theory and application of direct and alternating currents as applied to radio practice, After a brief chapter on thermionic valves there follows a comprehensive treatment of amplifiers and oscillators, principally applying to transmitters, together with radio
frequency drive equipment and modulators of various types. The information contained in these sections should be of great value to the operating engineer. A considerable portion of the’ subsequent chapter dealing with transmitter types relates to the design. and adjustment of the "Doherty" high efficiency transmitter amplifier, an improvement on which, known as the "Fortescue System," has been developed by the BBC for economy in high-power transmitters. The book concludes with a very useful section on feeders, aerial coupling circuits, and aerials, and also deals with the basic mechanical design consideration involved in triatic suspension of high frequency. curtain arrays. ; Altogether this book is well worthy of inclusion in the library of technical personnel. required to operate and maintain radio transmitting equipment. It is
well indexed.
W.L.
H.
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New Zealand Listener, Volume 19, Issue 479, 27 August 1948, Page 20
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337FOR RADIO ENGINEERS New Zealand Listener, Volume 19, Issue 479, 27 August 1948, Page 20
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