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1887

Journal of the British Institution of Radio Engineers

Volume 21, Issue 3, March 1961

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Volume 21, Issue 3

March 1961

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A dielectric drum storage system
  • Author(s): S. Morleigh
  • Source: Journal of the British Institution of Radio Engineers, Volume 21, Issue 3, p. 211 –220
  • DOI:  10.1049/jbire.1961.0027
  • Type: Article
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  • p. 211 –220 (10)
    An examination is made of a new storage system proposed for use with digital computers and data processing equipment. This system, which utilizes a metal drum coated with a thin layer of a dielectric material, would employ two distinct methods of storage and could be used to fulfil a wide range of functions connected with computing and associated devices. The first of the proposed methods of storage would be in the form of charge patterns on a dielectric surface, and could probably be used to store data for periods ranging from milliseconds up to a few hours, while the second method, which is intended for long term storage, would be by means of internal polarization of the dielectric.
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Resistive pick-off devices utilizing oxide film tracks
A special-purpose analogue computer and its use in reactor engineering
The synthesis of high-purity oscillations suitable for single-sideband receivers
  • Author(s): P.S. Carnt  and  E. Ribchester
  • Source: Journal of the British Institution of Radio Engineers, Volume 21, Issue 3, p. 237 –240
  • DOI:  10.1049/jbire.1961.0030
  • Type: Article
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  • p. 237 –240 (4)
    An oscillator is controlled by a phase locked loop, its output frequency being mixed with a selected part of a 100 kc/s spectrum to form an i.f. in the 900–1000 kc/s region. This i.f. feeds one side of a phase detector, the other side being fed by an interpolating signal. The latter may be derived either by another similar stage operating at a lower frequency, or by any other suitable method, the required purity in this signal being only of the order of 40 dB. The a.p.c. loop will lock when the i.f. and the interpolating frequency are the same. In the locked condition an additional filter is switched into the loop by means of a quadrature phase detector, and this filter reduces the amplitude of spurious frequencies and noise in the output. The paper discusses factors affecting the resultant purity.
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Thin polymeric films for use as dielectrics
Discussion on “Thin polymeric films for use as dielectrics”
Problems in the design of numerical control equipment for machine tools
An equipment for automatically processing time multiplexed telemetry data
The relative magnitudes of modulation products in rectifier modulators and some effects of feedback
  • Author(s): D.P. Howson
  • Source: Journal of the British Institution of Radio Engineers, Volume 21, Issue 3, p. 275 –281
  • DOI:  10.1049/jbire.1961.0035
  • Type: Article
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  • p. 275 –281 (7)
    The various modulation products occurring in series, shunt and ring modulators are evaluated for square-wave switching of the rectifiers. It is assumed throughout that the modulator terminations are resistive, but not necessarily the same, at the frequencies of the modulation products; their value at other frequencies is, of course, immaterial. The case when the square-wave function has unequal mark/space ratio is discussed for each of the modulators when the terminations are constant resistances. Graphs are given of the ratios of the most important products for three common classes of termination. Finally, two feedback modulator circuits for use with rectifier modulators are examined, and it is shown that a knowledge of the relative magnitudes of the modulation products in these circuits enables effective designs to be made.
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Parametric diodes—design and fabrication
  • Author(s): D.B. Day
  • Source: Journal of the British Institution of Radio Engineers, Volume 21, Issue 3, p. 283 –286
  • DOI:  10.1049/jbire.1961.0036
  • Type: Article
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  • p. 283 –286 (4)
    Solid state diffusion into silicon can be used to produce a rectifying junction. The capacitance of a diode made this way varies with the bias applied to it. The device is designed to be a variable capacitance having a low loss. The unbiased capacitance of a diode depends on the starting material and the diffusion parameters but to reduce the value to one that is useful (a few pF) the area has to be limited. A small area of the junction is isolated by ultrasonic cutting, leaving a plinth or “mesa”. Contact to the mesa is made in an encapsulation suitable for use in a wave-guide. Amongst other uses, the diodes are suitable for low-noise (para metric) amplifiers, frequency multipliers and high-frequency switches.
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