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Radio and Electronic Engineer

Issue 3 • Date March 1977

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Displaying Results 1 - 9 of 9
  • Forty years' retrospect

    Publication Year: 1977
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    Freely Available from IEEE
  • Micro-APP: a building block for low-cost high-speed associative parallel processing

    Publication Year: 1977 , Page(s): 91 - 99
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (946 KB)  

    A design technique, which allows the data-storage and the word-control functions of a byte-organized variable record-length Associative Parallel Processor (APP), to be integrated on a single l.s.i. chip is discussed, and a new l.s.i. device, called the Micro-APP, is proposed. Two implementations of the Micro-APP (16 words × 16 bits and 32 words × 12 bits) are described and their characteristics ... View full abstract»

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  • Letter: Spatial filtering of microwave images suggested by human visual processes

    Publication Year: 1977
    Cited by:  Papers (1)
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  • The use of phase-control height diversity for 11 GHz digital radio systems

    Publication Year: 1977 , Page(s): 101 - 104
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (418 KB)  

    It has been proposed that the existing sites and structures of the Post Office line-of-sight radio networks should be utilized to facilitate the introduction of a t.d.m. overlay network in the frequency band 10.7¿11.7 GHz. Those sections that suffer the greatest variations in propagation characteristics owing to their length may need a diversity system. This paper shows that at 11 GHz and at the ... View full abstract»

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  • A new sub-bottom profiling sonar using a non-linear sound source

    Publication Year: 1977 , Page(s): 105 - 111
    Cited by:  Papers (1)
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (878 KB)  

    This paper describes a sub-bottom profiling sonar based on a non-linear sound source. The primary frequencies are centred around 38 kHz giving a difference frequency in the range of 1¿7 kHz with beamwidth from 10°¿5°. Using the relative broad bandwidth of the system the transmitted signal can be phase-modulated and the received signal compressed by correlation technique. The design considerati... View full abstract»

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  • A digital instrument with histogram output

    Publication Year: 1977 , Page(s): 112 - 116
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (697 KB)  

    The paper discusses the basic design philosophy and principle of operation of a digital instrument which automatically measures a physical variable periodically, and produces a corresponding histogram output of the measured values. An illustrative example is given of how the instrument may be employed in quality control techniques applied to the production of ferrite components. Other possible app... View full abstract»

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  • A phase-locked-loop phase-shifter for band-limited signals

    Publication Year: 1977 , Page(s): 117 - 120
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (516 KB)  

    The need for a voltage-controllable phase-shifter frequently arises in radio astronomy interferometry work. This paper describes a particular implementation of such a phase shifter in which a phase-locked loop of special design is used as the principal phase-shifting element. Relative phase-shifting of a band-limited signal is accomplished by mixing the signal with a phase-shifted local oscillator... View full abstract»

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  • Letter to the Editor: A pioneer of airborne radio

    Publication Year: 1977
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  • Superselectivity in the azimuth and frequency dimensions

    Publication Year: 1977 , Page(s): 121 - 130
    Save to Project icon | Click to expandAbstract | PDF file iconPDF (1385 KB)  

    The possibility of extrapolation from a limited segment of a well-behaved waveform or wavefield is briefly discussed, in terms of elementary information theory, in order to establish its basic limitations and possible applications. Next, the paper briefly outlines the superdirective null forming technique for generating wideband superdirective antennas of moderate total directivity. It then develo... View full abstract»

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