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# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 25 of 35
• ### Dispersion of h.f. pulses by ionospheric reflection

Publication Year: 1969, Page(s):1789 - 1793
Cited by:  Papers (4)
| | PDF (499 KB)

An approximate expression is presented which gives the duration of an electromagnetic pulse formed by the spectral content in an h.f. bandwidth received after reflection in the ionosphere. The variation of the pulse duration with the bandwidth and a coefficient of the propagation path is shown. Methods of estimating the propagation-path coefficient are discussed. The geomagnetic field is omitted f... View full abstract»

• ### Study of the satellite/earth-station/domestic-receiver chain in a satellite system for television distribution

Publication Year: 1969, Page(s):1797 - 1806
| | PDF (1060 KB)

This study is a detailed evaluation of a satellite link, consisting of the downpath, the receiving earth station and the domestic television receiver, such as might be envisaged within the framework of an operational international system for distributing television programmes by satellite. Moreover, as an illustration, the paper discusses the application of the methods described to a satellite sys... View full abstract»

• ### Review of progress in mercantile-marine radiocommunication. Part 1: Systems and facilities

Publication Year: 1969, Page(s):1807 - 1811
| | PDF (876 KB)

The review covers the significant developments during recent years in the mercantile-marine radiocommunication services. It deals with the overall improvements in system design and in the facilities available both in respect of safety-radio services and those used for commercial communication. The development of safety-radio services is outlined with special reference to the most recent convention... View full abstract»

• ### Review of progress in mercantile-marine radiocommunication. Part 2: Technique and design

Publication Year: 1969, Page(s):1812 - 1820
| | PDF (1388 KB)

The review covers the significant developments during recent years in the mercantile-marine radio-communication services. It covers, in some detail, the changes in design techniques and the improved standards of performance realised by modern equipments. The great advances made in equipment design, e.g. the high standards of frequency stability in modern transmitters and receivers used for s.s.b. ... View full abstract»

• ### Queueing model for message-switching networks with constant-length messages

Publication Year: 1969, Page(s):1821 - 1826
Cited by:  Papers (2)
| | PDF (736 KB)

Expressions are given for the first and second moments of the queue-length distribution of the single-server queue with constant service time and general arrival distribution. A general relationship between the moments of the queue-length and message-delay distributions holds in the particular case of a first-come-first-served queue discipline. The results for a single queue enable mean message de... View full abstract»

• ### Transient-response considerations in limiter-discriminator detection of binary frequency-shift keying

Publication Year: 1969, Page(s):1827 - 1829
| | PDF (414 KB)

The correct detection of binary frequency-shift-keying (f.s.k.) signals is fundamental to the attainment of optimum error performance in both coded and noncoded systems employing f.s.k. signalling. When limiter-discriminator (f.m.) detection is employed, the parameters of the detector to be determined are the bandwidth of the i.f. filter Bif, and the type and bandwidth Blp of the post-detection lo... View full abstract»

• ### SUSANߞa program for the digital computation of transients in networks with distributed elements

Publication Year: 1969, Page(s):1831 - 1832
| | PDF (247 KB)

The specifications of the SUSAN program for transient computation are outlined, and a brief description is given of the mathematical techniques which form its basis. Technical details of the program together with the minimum machine requirements for its implementation are also given. View full abstract»

• ### Generalised exact nonuniform transmission lines and their characteristic functions

Publication Year: 1969, Page(s):1833 - 1837
Cited by:  Papers (1)
| | PDF (493 KB)

A new category of nonuniform transmission lines, called exact nonuniform transmission linesÂ¿, may be obtained, if the linear second-order differential equation representing the variation of voltage (or current) along any of the lines of the new category, satisfies the condition of exactness for a linear second-order differential equation. The paper introduces two generalised subclasses of such e... View full abstract»

• ### Realisation of gyrators using operational amplifiers, and their use in RC-active-network synthesis

Publication Year: 1969, Page(s):1838 - 1850
Cited by:  Papers (75)
| | PDF (1380 KB)

The realisation of negative-impedance convertors (n.i.c.s) and invertors (n.i.i.s) using the bridge-type circuit is briefly surveyed. An equivalence relating the nullor to infinite-gain controlled sources is first proved, and is then used for the derivation of nullator-norator equivalent circuits for n.i.c.s and n.i.i.s. Some properties of networks containing singular elements, which are used in t... View full abstract»

• ### Analogue electronic multiplier

Publication Year: 1969, Page(s):1851 - 1854
Cited by:  Papers (1)
| | PDF (389 KB)

The paper describes a new type of analogue electronic multiplier. The linearity and stability are such as to permit the determination of the product of two quantities to within 0.1%. The circuit of the multiplier is quite simple, and may be widely employed. View full abstract»

• ### Distortion phenomena in a switching transistor mixer

Publication Year: 1969, Page(s):1855 - 1859
| | PDF (511 KB)

It is shown that the nonlinear distortion generated in a switching transistor mixer may be accurately predicted by a suitable modification of an analysis which has hitherto been restricted to diode-modulator and mixer circuitry. Of particular practical importance are the 3rd-order intermodulation- and cross-modulation-distortion products produced by interaction between the local oscillator and the... View full abstract»

• ### Some aspects of the p-n junction second-breakdown mode

Publication Year: 1969, Page(s):1860 - 1862
| | PDF (368 KB)

An analysis is presented of the p-n junction second-breakdown mode. Using the relationships between the potential and the temperature within a current constriction, explicit equations are derived for the second-breakdown terminal voltage, for both low- and high-power devices. An assessment of the constriction size is given, and some generality incorporated into the analysis by the introduction of ... View full abstract»

• ### Thermal noise in field-effect devices

Publication Year: 1969, Page(s):1863 - 1868
Cited by:  Papers (5)
| | PDF (534 KB)

Thermal-noise calculations for both junction-gate and m.o.s. field-effect transistors are performed using a straightforward circuit-analysis technique based on the equivalent circuit. Expressions are obtained for Â¿d2, Â¿g2 and the correlation coefficient of ig and id at moderately high frequencies. A comparison with van der Ziel's results for the bulk f.e.t. shows that the expression for the gate... View full abstract»

• ### Overhead-line oscillations and the effect of aerodynamic dampers

Publication Year: 1969, Page(s):1869 - 1874
Cited by:  Papers (7)
| | PDF (775 KB)

The paper is an attempt to further the understanding of aerodynamic effects in the large-scale vertical oscillations of overhead lines, usually known as gallopingÂ¿. The energy per cycle dissipated by the aerodynamic drag is calculated, and then, assuming the lift coefficient of the cable to be less than some measured maximum value, the maximum possible amplitude of oscillation for a given windsp... View full abstract»

Publication Year: 1969, Page(s):1875 - 1884
Cited by:  Papers (6)
| | PDF (1090 KB)

Up to the present, radio-interference fields in close proximity to multiconductor lines have been calculated, in the first instance, on the assumption that the system is lossless. The loss has been calculated subsequently, on the assumption that the theoretical mode distributions hold good. In view of the errors known to occur when this earlier method is used, the present paper describes a theory ... View full abstract»

• ### External thermal resistance of three buried cables in trefoil-touching formation. Restricted application of superposition

Publication Year: 1969, Page(s):1885 - 1890
Cited by:  Papers (2)
| | PDF (668 KB)

An approximate formula, with error bounds, is derived for the thermal resistance between three touching circular cylinders and a plane. The formula is based on a restricted application of the principle of superposition. The distance between the cylinder configuration and the plane is assumed to be much greater than the cylinder radius, which is the case for the evaluation of the external thermal r... View full abstract»

• ### Optimum design and performance calculations of highly magnetically saturated d.c. machines for large-scale production

Publication Year: 1969, Page(s):1891 - 1899
| | PDF (1054 KB)

The paper describes a computer program to predict the performance of a highly magnetically saturated, uncompensated, direct-current machine. The program is used in conjunction with other programs to design cost-optimised machines. A review of analysis and synthesis techniques used in the optimisation process is included. The performance calculations determine the main- and leakage-flux distributio... View full abstract»

• ### Application of test results to the calculation of short-circuit levels in large industrial systems with concentrated induction-motor loads

Publication Year: 1969, Page(s):1900 - 1906
Cited by:  Papers (4)
| | PDF (885 KB)

The paper reviews the problems associated with determining the duty of circuit breakers in industrial power systems, and considers particularly the contribution made by induction motors. Original test results are presented and compared with calculated induction-motor fault contributions. A simple empirical method for calculation is proposed, and results of a survey of constants for 415V and 3.3kV ... View full abstract»

• ### Simple formulas for voltage-regulator gains for best alternator stability

Publication Year: 1969, Page(s):1907 - 1914
| | PDF (897 KB)

Simple formulas are derived for the calculation of the optimum loop gain and damping gain of a certain class of voltage regulators, for good alternator steady-state stability. A generalised Mitrovic method leads to a simple set of curves which apply to all alternators and to all regulators of a given class. A transformation of the parameters of these curves then leads to the required formulas. The... View full abstract»

• ### Discussion on 'Copper drag on commutators', 'Flashover on d.c. machines' and 'Commutation phenomena in electrical machines. Part 2: Further experiments in flashover'

Publication Year: 1969, Page(s):1914 - 1919
| PDF (1287 KB)
• ### Erratum: Flashover on d.c. machines

Publication Year: 1969
| PDF (182 KB)
• ### Erratum: Copper drag on commutators

Publication Year: 1969
| PDF (182 KB)
• ### Comprehensive consideration of transient frequency deviations in power-system transient-stability studies

Publication Year: 1969, Page(s):1920 - 1928
| | PDF (1047 KB)

Recent studies which have considered separately the influence of transient frequency deviations on the various components of power systems subjected to transient disturbances are integrated, with the resulting development of a comprehensive computer program which takes full account of frequency dependence of all systems components and allows a more complete assessment of system performance than ha... View full abstract»

• ### Design of multivariable control systems using the inverse Nyquist array

Publication Year: 1969, Page(s):1929 - 1936
Cited by:  Papers (50)
| | PDF (994 KB)

The inverse Nyquist array is a set of diagrams corresponding to the elements of the inverse of the open-loop transfer function of a control system. A number of theorems are proved which show how this array can be used to investigate the stability of multivariable control systems. The application of the array to the design of such systems is illustrated. View full abstract»

• ### Stability regions of linear continuous or discrete-data control systems

Publication Year: 1969, Page(s):1937 - 1939
Cited by:  Papers (1)
| | PDF (332 KB)

This paper describes the application of Beckers real-and-imaginary-curves method to the determination of stability bounds of linear continuous or sampled-data control systems. Examples are given of the application of the method to the determination of stability regions of systems containing two variable parameters. View full abstract»

## Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

Full Aims & Scope