By Topic

Radio and Electronic Engineer

Issue 5 • Date May 1973

Filter Results

Displaying Results 1 - 9 of 9
  • Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multiple channel u.h.f. reception on naval ships

    Page(s): 299 - 311
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (2187 KB)  

    The environmental conditions which are present on a naval ship pose a number of problems in designing an efficient u.h.f. receiving system not normally encountered in a typical ground station. These conditions and the methods which are adopted to ensure reliable and efficient communication are described in the paper. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Receiver innovations for single-sideband broadcasting

    Page(s): 312 - 316
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (664 KB)  

    Recent developments in integrated circuit technology and proposals by the European Broadcasting Union for single-sideband broadcasting have renewed interest in the re-design of broadcast receiver structures for the long and medium wave bands. This paper outlines the requirements for an s.s.b. receiver and reviews some of the many designs for such receivers which have been published recently View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Diversity reception for v.h.f. mobile radio

    Page(s): 317 - 324
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1114 KB)  

    Multipart fading on y.h.f. mobile radio links is investigated, and aerial diversity reception considered for improved reception at the mobile terminal. A 3-channel adaptive array has been built using a conventional v.h.f.-a.m. receiver modified to measure signal amplitudes and relative phases. Experimental results show the effects of typical multipath environments, and the improvement obtained with an adaptive array. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Sensitivity of narrowband cascaded bandpass filters

    Page(s): 325 - 328
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (436 KB)  

    The sensitivity of the magnitude transfer function of narrowband cascaded filters is evaluated in terms of pole sensitivities. It is shown that Q sensitivity is often negligible in determining performance and that the worst-case sensitivity of the magnitude transfer function exhibits maxima at particular frequencies and that Q-factor and ¿0 sensitivity are the dominant factors determining the sensitivity of the magnitude transfer function. The worst-case sensitivity of the cascade-realization is compared with that of the corresponding ladder realization View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A method of analysis and design of linear high-order systems

    Page(s): 329 - 335
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    A stability criterion is defined for high-order linear systems using root-locus method. The general character of the system can be predicted by the trajectories plotted from this criterion. The sub-characteristic equations defined in the criterion afford a simple means for the design of systems with multiple adjustable parameters. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Transient analysis on a small computer

    Page(s): 336 - 340
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (508 KB)  

    A transient analysis program is described which is now operational on a small computer with 16k words of store. This program, entitled SOTRAP, is able to perform low-cost time response simulation of networks which contain bipolar transistors and diodes. Details are given of the program's convenient input-data format, analysis technique and built-in device models. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Impulsive noise reduction in radio receivers

    Page(s): 341 - 347
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (964 KB)  

    The spectrum of impulsive noise is quite different from that of an a.m. or s.s.b. radio signal, but receivers designed to discriminate against the former have only been moderately successful. A mathematical analysis of a noise blanking receiver demonstrates the critical nature of system parameters. Signals in adjacent channels can give rise to excess noise in the wanted channel. Trapezoidal blanking functions are shown to have significant advantages, and the necessity for some means of delaying the signal before blanking is demonstrated. A noise blanking receiver incorporating an ultrasonic glass delay line is described. View full abstract»

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

    Save to Project icon | PDF file iconPDF (215 KB)  
    Freely Available from IEEE