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Online ISSN 1350-911X Print ISSN 0013-5194

Electronics Letters

Volume 6, Issue 15, 23 July 1970

Volumes & issues:

Volume 6, Issue 15

23 July 1970

Online system identification using matrix pseudoinverse
Minimising cochannel interference in television reception
  • Author(s): H. Page
  • Source: Electronics Letters, Volume 6, Issue 15, p. 454 –455
  • DOI:  10.1049/el:19700319
  • Type: Article
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  • p. 454 –455 (2)
    A method is proposed for minimising cochannel interference in television reception, by introducing a random change in phase of the vision carrier at the beginning either of each field, or each line, of the television picture. Unlike the present system, in which the carrier frequency offsets are related to the picture line frequency, the benefits to be expected from the method described would apply independent of the number of interfering stations. No practical tests on the proposal have yet been made.
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Microwave conductivity of thick-film conductors
New explanation of the polarity effect in current collection
Focusing of radio waves reflected from the ionosphere at low angles of elevation
Indirect calculation of network-function sensitivities with variations of some network parameters
  • Author(s): J. Čajka  and  J. Valsa
  • Source: Electronics Letters, Volume 6, Issue 15, p. 458 –460
  • DOI:  10.1049/el:19700323
  • Type: Article
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  • p. 458 –460 (3)
    In the letter an indirect method for calculation of the sensitivity (first order or higher order) of an arbitrary network function to variations of the parameter of some network elements is presented. The variable parameter can be the admittance of a 1-port, the transconductance of a voltage-controlled current source or the amplification of an ideal voltage or current amplifier. The procedure is suitable for computer calculations.
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Prime-focus one- and two-hybridmode feeds
Efficient calculation of gradient in state estimation
  • Author(s): R.F. Brown  and  G.C. Goodwin
  • Source: Electronics Letters, Volume 6, Issue 15, p. 461 –462
  • DOI:  10.1049/el:19700325
  • Type: Article
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  • p. 461 –462 (2)
    Nearly all the computational time required in digital calculation of the gradient of an error index with respect to initial state is taken up by integration of differential equations. By direct application of the variational calculus, it is shown that the gradient may be calculated by integration of the state equations and costate equations, namely 2n equations. Previously, it has been thought necessary to integrate the n state equations and n2 state-sensitivity equations, namely n2+n equations.
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Dielectric Green's function for parameters of microstrip
  • Author(s): J.A. Weiss  and  T.G. Bryant
  • Source: Electronics Letters, Volume 6, Issue 15, p. 462 –463
  • DOI:  10.1049/el:19700326
  • Type: Article
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  • p. 462 –463 (2)
    The program generates a data file of the dielectric Green's function in format suitable as input to the program which has been previously deposited in the IEE Program Library for computation of the parameters of microstrip. With the two programs, tables of microstrip parameters can be generated for any value of substrate permittivity. This program also provides the option of including the effect of an upper ground plane. The calculation embodies the quasistatic approximation.
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Display of current/voltage relationships in power-transistor circuits operating at v.h.f.
  • Author(s): H.W. Rouhof  and  H.W. Loeb
  • Source: Electronics Letters, Volume 6, Issue 15, p. 464 –466
  • DOI:  10.1049/el:19700327
  • Type: Article
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  • p. 464 –466 (3)
    A method for the simultaneous measurement of voltage and current in v.h.f. microstrip circuits, and its application to the display of instantaneous I/V relationships in transistor power amplifiers, is described. The current waveform is obtained by integration of the voltage induced in a stripline coupling loop. Frequency response data are given, together with I/V characteristics for a 175 MHz transmitter output stage under various matching conditions.
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Accurate calculation of small-signal growth rates in avalanche diodes
Design of multiple-input phase-locked oscillator in mutually synchronised system
  • Author(s): H. Inose ; T. Saito ; T. Shibuya
  • Source: Electronics Letters, Volume 6, Issue 15, p. 468 –469
  • DOI:  10.1049/el:19700329
  • Type: Article
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  • p. 468 –469 (2)
    The multiple-input phase-locked oscillator used as the clock source of each office in mutually synchronised systems should be designed to obtain a compromise between several conflicting requirements. The stability of the system is needed, although the phase difference between offices should be small, and fast responses to large changes in system parameters are needed, although jitter reduction is required. The letter gives the optimum design parameter to provide a compromise between these requirements. Two schemes for a stabilised variable-frequency oscillator are proposed, together with the results of an experiment which obtained an overall stability of 0.5×10−7.
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Diffraction by wide-flare-angle corrugated conical horns
Analysis of parallel dry-reed operation
Process identification with visual interaction between operator and computer
Rational approximation to transfer-function matrix of distributed system
Mesa profiles and edge breakdown of silicon avalanche diodes
Noise measurements of silicon planar microwave transistors in the frequency range 4–8 GHz
Investigation of deep-depletion régime of m.o.s. structures using ramp-response method
Existence of positive periodic solutions of certain ordinary differential equations
Exact computation of group delay and its sensitivities using adjoint-network concept
Quantitative model for epitaxial-transistor collector characteristics
Topological and sensitivity formulas for a general nonreciprocal 2-port network
Effect of state-variable feedback on numerators of transfer functions
Erratum: Computation of mixing coefficients for field-effect transistors with non-square-law transfer characteristics

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