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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 4, Issue 11, 31 May 1968

Volumes & issues:

Volume 4, Issue 11

31 May 1968

‘Wisdom’—self-synchronising delta-modulation orthogonal-channel modulator
Optimum noncommensurate stepped transmission-line transformers
Low-voltage light-amplitude modulation
Synchronising and damping torques in a synchronous machine with 2-axis excitation control
Effect of operating conditions on reverse gate current of junction f.e.t.s
Efficiency of the transistor transit-time oscillator
Absorption spectra in axially magnetised y.i.g. rods
Method of minimising the effect of disturbances on the estimate of the impulse response of a linear system
  • Author(s): C.J. Macleod
  • Source: Electronics Letters, Volume 4, Issue 11, p. 220 –222
  • DOI:  10.1049/el:19680167
  • Type: Article
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  • p. 220 –222 (3)
    A method is proposed whereby the errors in the estimate of the impulse response, obtained from pseudorandom-binary-signal correlation experiments, due to low-frequency drift at the output of the system may be reduced. In particular, errors due to a constant, a linear, a quadratic and a cubic term in the power-series representation of the noise are eliminated. Moreover, the bias on the estimate of the impulse response, due to the nonzero value of the autocorrelation of the binary sequence for nonzero delays, is eliminated.
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Comment: Time-discrete networks
  • Author(s): V. Dvořák
  • Source: Electronics Letters, Volume 4, Issue 11, p. 222 –223
  • DOI:  10.1049/el:19680168
  • Type: Article
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  • p. 222 –223 (2)
    The letter is concerned with time-discrete networks characterised by difference relations. It is shown that a time-discrete network can be defined as an interconnection of lossless transmission lines and multiple parallel transmission lines, resistors and voltage- and current-sequence sources. An approximation of LC components by means of lossless transmission lines is equivalent to the choice of a ‘trapezoidal’ rule of a numerical integration.
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Effects of large parasitic loops on alford-loop counterpoise radiation patterns
Determination of the linear output signal of a process containing single-valued nonlinearities
Flicker noise in Gunn diodes
Relatively prime polynomial matrices
Propagation characteristics of the TM01 surface-wave mode in dielectric-lined coaxial cables
  • Author(s): J.E. Lewis  and  M.M.Z. Kharadly
  • Source: Electronics Letters, Volume 4, Issue 11, p. 228 –230
  • DOI:  10.1049/el:19680173
  • Type: Article
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  • p. 228 –230 (3)
    Accurate calculations of the propagation coefficients of the TM01 surface-wave mode in coaxial cables with dielectric linings on the inner, outer or both conductors were carried out using a perturbation method, and were checked by solving the exact characteristic equations. The calculations show that the perturbation method yields very accurate results, and that the attenuation coefficients cannot be reduced below that of the quasi-TEM mode in the unlined cable.
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Effect of Johnson noise on l.s.a. oscillators
  • Author(s): G.S. Hobson
  • Source: Electronics Letters, Volume 4, Issue 11, p. 230 –232
  • DOI:  10.1049/el:19680174
  • Type: Article
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  • p. 230 –232 (3)
    The r.m.s. electron-density fluctuations (Johnson noise) within the GaAs of l.s.a. oscillators are shown to be about 10% of the mean density. The effect of these fluctuations is determined by an analytic calculation of l.s.a.-oscillator efficiency (similar to that of Bott and Hilsum, 1967). The specification of the velocity/field characteristic of conduction electrons in GaAs in an analytical form, which separates the importance of peak/valley ratio and negative differential mobility, permits an indication of the optimum form of the characteristic for the l.s.a. mode. The calculated efficiencies are somewhat smaller than those of previous calculations.
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Autocorrelation function of a 4-level msequence
  • Author(s): P.A.N. Briggs  and  K.R. Godfrey
  • Source: Electronics Letters, Volume 4, Issue 11, p. 232 –233
  • DOI:  10.1049/el:19680175
  • Type: Article
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  • p. 232 –233 (2)
    In a recent communication, Balza, Fromageot and Maniere described how to generate 4-level maximum-length sequences, and listed several of the properties of these sequences. Some of the expressions for the autocorrelation function are incorrect, and it is the purpose of this letter to give the correct formulas, and to show how to reduce the off-peak autocorrelation by choosing different analogue levels to correspond with the levels of the sequence.
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Calculation of the parameters of the microwave Gunn generator
Automatic identification of nonlinear static plant by degressive feedback and digital computer
Erratum: Generalised Cheby̅shev lowpass filters
Erratum: Raised trigonometric and hyperbolic power lines
Erratum: Lyapunov functionals for a class of wave equations
Erratum: Radiation from ring sources of electric or magnetic dipoles with different orientations in free space
Acknowledgment: Subharmonics produced in purely resistive networks with single sinusoidal inputs

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