By Topic

Radio and Electronic Engineer

Issue 5 • Date November 1970

Filter Results

Displaying Results 1 - 8 of 8
  • Profile of a profession

    Save to Project icon | PDF file iconPDF (132 KB)  
    Freely Available from IEEE
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Designing for automatic testing: The concept and general approach

    Page(s): 225 - 232
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1043 KB)  

    This paper deals with conceptual aspects of design which influence, and are influenced by, decisions to use automatic testing techniques in the factory and/or in the field. The early phasing of the influencing process is emphasized, and the importance of `design-for-autotest¿ as a design parameter is discussed in relation to other parameters, and the case is made for its co-ordination into the varied aspects of the design requirements. These imply rationalizing design techniques, signal characteristics, equipment constructional forms and factory test organizations. Optimization of design must place a minimum brake on innovation. The applicability of automatic testing to the various stages of factory assembly, and the need to differentiate between the basic testing task and fault analysis by sub-routine, are established. Optimization of the differing requirements of factory and field call for design compromise. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A laser machining system for making integrated circuit masks

    Page(s): 233 - 240
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1339 KB)  

    An automatically controlled laser machining system for cutting integrated circuit masks in thin films deposited as fused silica substrates is described. A high-pressure helium-neon pulsed laser is used for cutting precision edges and a continuously operated carbon-dioxide laser is used for fast machining of larger areas in the mask. Details of the machining speeds and edge precisions obtained with each laser are given. The requirements for machining masks with the aid of both lasers are discussed. Results obtained in cutting test masks are presented and it is shown that considerable saving in machining times can be effected using the system of two lasers. The need for a vector generator, to control the movements of the work tables, as a peripheral to a computer is explained. Details of an experimental high-level mask-making computer language used with the above system are given. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The planning and commissioning of a communications satellite earth station and its integration with existing telecommunications systems

    Page(s): 241 - 254
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1811 KB)  

    The growth of the INTELSAT system of satellite communications is recalled and the considerations for on-site planning are discussed in the context of the construction of the earth station at Bahrain, Arabian Gulf in 1969. The relationship of other wideband systems in the Gulf is described, along with the resultant growth of traffic in an area where the demand had been suppressed due to the limitations of narrow-band high-frequency outlets. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A simple data recording system with computer analysis

    Page(s): 255 - 258
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (421 KB)  

    This system uses a new technique of f.m. recording to record accurately a small number of slowly varying parameters, and speech, on one track of a cheap commercial tape recorder. The record can readily be played back into a computer through a simple interface unit. The paper also describes transducers for converting pressure and temperature into frequency. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Plastic film capacitors

    Page(s): 259 - 264
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1363 KB)  

    A review of the various materials used in plastic film capacitors shows the advantages of polystyrene, polyethylene terephthalate and polycarbonate. The technique of construction of foil and film and of metallized types is described and the limitation of various electrical parameters pointed out. Life and reliability factors are explained as well as the mechanism of failure for both a.c. and d.c. operation. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Monte-carlo simulation of an active sonar

    Page(s): 265 - 271
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (819 KB)  

    This paper describes the analysis of a non-linear sonar processing system by simple Monte-Carlo methods. The target detection capability with isotropic background noise and spatially coherent reverberation is found with attention being paid to the effects of frequency filters in the input channels from the transducers. The resolution and detection of multiple and diffuse targets is assessed under noise free conditions and with the assumption of target scintillation due to forward scattering or medium inhomogeneity. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.