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Radio and Electronic Engineer

Issue 1 • Date January 1969

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Displaying Results 1 - 14 of 14
  • The changing years

    Publication Year: 1969, Page(s):3 - 4
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (124 KB)

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  • Correction: The Sixth Clerk Maxwell Memorial Lecture: Spatial communications

    Publication Year: 1969
    IEEE is not the copyright holder of this material | PDF file iconPDF (123 KB)
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  • The use of a radio frequency transformer to increase the sensitivity of a radio frequency admittance bridge

    Publication Year: 1969
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (613 KB)

    This paper describes a technique by which the sensitivity of a radio-frequency admittance bridge was increased by using an r.f. transformer, in order to measure small changes of admittance. The bridge measured the admittance of the primary circuit with the unknown admittance connected across the secondary, the nominal value of the secondary to primary turns ratio being ¿2. Using this method, meas... View full abstract»

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  • A theoretical appraisal of the quenched multiple domain mode in GaAs microwave diodes

    Publication Year: 1969, Page(s):11 - 15
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (379 KB)

    Quenched multiple domain (q.m.d.) mode oscillations in bulk GaAs have been analysed to obtain the relationships between efficiency, fundamental-frequency power output, fundamental-frequency negative resistance, and d.c. bias voltage. It is found that this highly efficient mode does not have the limitations of transit-time devices and consequently has a frequency-independent power × impedance prod... View full abstract»

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  • Letters to the Editor: Experiences in tropospheric scatter propagation experiments

    Publication Year: 1969
    IEEE is not the copyright holder of this material | PDF file iconPDF (241 KB)
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  • The design, construction and performance of thick film cermet trimming potentiometers

    Publication Year: 1969, Page(s):17 - 21
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (519 KB)

    The cermet trimming potentiometer is a miniature light-weight control having an extremely rugged construction. The nature of the resistive element provides an inherent freedom from catastrophic failure and offers a wide range of possible ohmic values. The design and its influence on some of the more fundamental properties of this control is discussed. The effects of both electrical and environment... View full abstract»

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  • Zero quiescent current monostable multivibrator

    Publication Year: 1969, Page(s):22 - 24
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (259 KB)

    A simple monostable multivibrator circuit using a complementary pair of transistors is described. In comparison with the conventional configuration, this circuit has such features that it would need no standing power and a smaller number of components. The commonemitter current amplification factor, hfe, of the transistors may be made as the overriding factor for the pulse width control and thus, ... View full abstract»

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  • Active and passive components for attachment to thick film circuits

    Publication Year: 1969, Page(s):25 - 29
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1732 KB)

    This paper discusses the development of suitable passive components (resistors and capacitors) for use with thick film circuits. The techniques of attachment of these components to the circuits are described. Experience with the attachment of certain types of semiconductors to thick film circuits is also described. View full abstract»

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  • Control: past, present and future

    Publication Year: 1969, Page(s):30 - 32
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (399 KB)

    Automatic control developed historically as a necessary consequence of replacing human or animal power by wind and water power and later by steam power. Its beginnings were empirical, but an important contribution to the theory was made by Clerk Maxwell, and later the development of feedback amplifiers led to intensive theoretical work in the U.S.A. By 1945 a well-developed and highly successful t... View full abstract»

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  • The impact of pulse code modulation on the telecommunication network

    Publication Year: 1969, Page(s):33 - 46
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1763 KB)

    The basic processes of transmission and switching are cheaper for multiplex digital signals than for their voice-frequency equivalents, and introduce little or no impairment of the message. Conversion between analogue and digital signals introduces much of the cost and almost all of the impairment in a p.c.m. communication system. The long-term plan for a telephone administration should therefore ... View full abstract»

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  • A communication network for real-time computer systems

    Publication Year: 1969, Page(s):47 - 51
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (822 KB)

    Digital communication between computers and their users has until now been provided by exploiting the telephone network to carry digital data because of the wide coverage of the telephone network and the high capital cost of establishing any new, generally-available telecommunication service. In the long run it is expected that a specialized digital communication network will be required, designed... View full abstract»

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  • Points from a discussion on communication systems

    Publication Year: 1969, Page(s):51 - 52
    IEEE is not the copyright holder of this material | PDF file iconPDF (289 KB)
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  • Thick films in automotive equipment

    Publication Year: 1969, Page(s):53 - 56
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (727 KB)

    The problems facing the manufacture of microelectronic equipment for motor vehicles are outlined. These arise from the physical and electrical environments, the power levels to be controlled which result in high currents, a need for very low saturation voltages, low thermal resistances and efficient heat sinks. These items are then considered with reference to a hybrid integrated circuit alternato... View full abstract»

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  • A fast binary to logarithmic analogue converter

    Publication Year: 1969, Page(s):57 - 64
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (965 KB)

    The paper describes a circuit configuration which produces an output proportional to the logarithm of binary numbers presented at its input. The circuit is designed to process the first six significant digits only and can deal with binary numbers up to 220¿1. The maximum output settling time, to within ¿% of the final output level, is about 2 ¿s. The resolution of the circuit is limited by the ... View full abstract»

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