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This dictionary presents definitions of both the well-established terms and many new ones that have come into use with the advances that have taken place in the fields of radio and television. In many cases extended definitions are given in order to describe briefly elementary principles and circuits, while newer and more complex devices and systems are described in even greater detail where necessary to make clear the underlying principles or modes of operation. S ubjects extensively covered include: radiotelephones and radiotelegraphy; monochrome and color television; facsimile transmission; radio direction finding; receivers and transmitters; transistors; semiconductor and thermionic devices; audio and high fidelity reproduction; aerials, transmission lines, and waveguides; microwave techniques and tubes; communication satellites; propagation; television cameras; measuring instruments; and general electrical and radio terms. Also included are basic terms in the fields of radar, radio navigation, radio astronomy, studio equipment, and lasers. To supplement the definitions, a list of technical abbreviations is appended together with several useful tables. (JY)

This is the fifth in a series on shortened versions of the Avionics Fundamentals and Aviation Electronics Technician R (Radar) Courses. The first four studies indicated that the initial revisions of the courses led to substantial savings in training time, but that the graduates from the revised courses were slightly inferior to graduates from the original courses on several criteria. It was decided that shortened versions of both courses should be implemented on an operational basis, but that these courses should incorporate certain changes that had been suggested by experience with the first revisions. These changes led to courses that were not quite as short as those produced in the first revision. It was found that students in the 8.5 week version of the Aviation Electronics Technician R (Radar) course did just as well as students in the original 10.8 week version of the course. Students in the 16 week version of the Avionics Fundamentals course were found to be slightly inferior to students in the original 19 week version. (authors/ly)

THREE PRECEDING REPORTS PRESENTED THE EFFECTS OF SHORTENING TRAINING TIME IN AVIONICS FUNDAMENTALS AND AVIATION ELECTRONICS TECHNICIAN (RADAR) TRAINING UPON THE FINAL COMPREHENSIVE EXAMINATION IN THESE COURSES AND UPON PERFORMANCE IN A SUBSEQUENT EQUIPMENT COURSE. THIS REPORT COMPARES THE ON THE JOB PERFORMANCE OF GRADUATES FROM FOUR GROUPS MATCHED ON THE BASIS OF GRADES MADE IN A SHORT COURSE TAKEN PRIOR TO TRAINING IN AVIATION ELECTRONICS. EACH GROUP RECEIVED DIFFERENT LENGTHS OF TRAINING. IN GENERAL, FLEET PERFORMANCE WAS AFFECTED BY THE LENGTH OF TRAINING--THE LONGER THE TRAINING, THE BETTER THE PERFORMANCE. SHORTENING THE FUNDAMENTAL ELECTRONICS COURSE APPEARED TO AFFECT ON THE JOB PERFORMANCE MORE THAN SHORTENING THE EQUIPMENT COURSE. HOWEVER, THE FUNDAMENTALS COURSE WAS FIVE WEEKS SHORTER WHILE THE EQUIPMENT COURSE WAS THREE WEEKS SHORTER. WHILE THE GROUPS DIFFERED ON THE FINAL EXAMINATION ACCORDING TO THE LENGTH OF THE COURSE, THE DIFFERENCE IN SCORES WAS UNDEFINED IN TERMS OF ON THE JOB PERFORMANCE. THIS DOCUMENT, AD-661-858, IS AVAILABLE FROM THE CLEARINGHOUSE FOR FEDERAL SCIENTIFIC AND TECHNICAL INFORMATION, SPRINGFIELD, VA. 22151. MICROFICHE $0.65. HARDCOPY $3.00. 27 PAGES. (AJ)