Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 8, 19 April 1968
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Volume 4, Issue 8
19 April 1968
Frequency stability of a monotron oscillator with superconducting cavity
- Author(s): F. Biquard ; P. Grivet ; A. Septier
- Source: Electronics Letters, Volume 4, Issue 8, p. 143 –145
- DOI: 10.1049/el:19680111
- Type: Article
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p.
143
–145
(3)
We present several results concerning a monotron oscillator with a superconducting cavity. After a comparison between results and theory about starting current, beam-loading conductance and conversion power efficiency, we give a record of oscillator frequency over a period of 15 min. We find a frequency stabilityσ(<ϕ̇>t, τ)/2πF = 5 × 10−10 with τ = 1sfor a microwave output power of 35 mW at 2.976GHz
Stability of linear second-order equations with time-varying coefficients
- Author(s): J.A. Walker
- Source: Electronics Letters, Volume 4, Issue 8, page: 145 –145
- DOI: 10.1049/el:19680112
- Type: Article
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p.
145
(1)
Two sets of sufficient conditions are presented for the asymptotic stability of linear second-order equations having two time-varying coefficients. These conditions represent a weakening of those obtained by Starzinski, and this point is illustrated by simple examples.
Amplifying properties of bulk negative-resistance material
- Author(s): L. Lewin
- Source: Electronics Letters, Volume 4, Issue 8, p. 145 –147
- DOI: 10.1049/el:19680113
- Type: Article
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p.
145
–147
(3)
It is shown that a thin block amplifies on transmission but a thick block attenuates. A thick block amplifies by reflection, but this is a surface effect only. Both thin and thick blocks can generate oscillations, but in the latter, the bulk of the material does not contribute.
A.M.- and f.m.-noise characteristics of solid-state microwave oscillators
- Author(s): V.P. Kodali
- Source: Electronics Letters, Volume 4, Issue 8, p. 147 –148
- DOI: 10.1049/el:19680114
- Type: Article
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p.
147
–148
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The a.m.- and f.m.-noise spectra for two different types of X band solid-state signal sources are presented. These measurements were carried out on a specially designed noise-measuring system.
Bistatic scattering matrix for a finite right-circular cylinder
- Author(s): R.A. Ross ; C.C. Freeny ; J.C. Cleary
- Source: Electronics Letters, Volume 4, Issue 8, p. 148 –149
- DOI: 10.1049/el:19680115
- Type: Article
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p.
148
–149
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The bistatic scattering matrix for a finite conducting right-circular cylinder has been derived using the geometrical theory of diffraction. Initial evaluation of the analysis showed a very good agreement between theoretical predictions and monostatic measurements of radar cross-section as a function of polarisation and aspect angle. This letter now establishes the validity of that analysis in bistatic applications and for calculating scattering phase as well as radar cross-section.
Comments on ‘Quarter-wave transformer for a digital phase shifter’
- Author(s): F.E. Gardiol
- Source: Electronics Letters, Volume 4, Issue 8, p. 149 –150
- DOI: 10.1049/el:19680116
- Type: Article
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p.
149
–150
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In a recent publication, Hering describes a method to match a ferrite-loaded waveguide. It will be shown here that this approach leads to erroneous results for most cases of interest.
Low-power method of adjustment of medium-wave directional antennas
- Author(s): J.V. Surutka
- Source: Electronics Letters, Volume 4, Issue 8, p. 150 –152
- DOI: 10.1049/el:19680117
- Type: Article
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p.
150
–152
(3)
A new simple method of measuring the operating impedances and adjusting medium-wave directive arrays is presented. The desired current ratios and phases in radiating towers are set up by using conventional pentode amplifiers and wide-range phase shifters. The operating input impedances can measured by means of an operating impedance bridge, or by a voltmeter method which is described in more detail. Once the operating impedances are known, the dummy loads can be used in final matching of the high-power phasor system.
Subharmonics produced in purely resistive networks with single sinusoidal inputs
- Author(s): A.G.J. Holt and C. Nightingale
- Source: Electronics Letters, Volume 4, Issue 8, p. 152 –153
- DOI: 10.1049/el:19680118
- Type: Article
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152
–153
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It is shown that, if dynamic effects and energy storage are not taken into account, the resulting mathematical model of a nonlinear characteristic can produce subharmonics only at exact input amplitudes. Thus such mathematical models are completely unstable with respect to small variations in that amplitude.
Possible physical explanation of the observed behaviour of the hybrid TEM-dual surface wave in a coaxial cable having an electrically loaded inner conductor
- Author(s): H.M. Barlow
- Source: Electronics Letters, Volume 4, Issue 8, p. 153 –155
- DOI: 10.1049/el:19680119
- Type: Article
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p.
153
–155
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Numerical calculations for power distribution over the cross-section of a coaxial cable have been made for the particular case investigated experimentally, giving minimum attenuation at 3 GHz. The results reveal illuminating information about the behaviour of the hybrid and quasi-TEM waves in these circumstances.
Towards reducing errors in radar measurement of Faraday rotation
- Author(s): R.H.T. Bates and A.R. Jamieson
- Source: Electronics Letters, Volume 4, Issue 8, p. 155 –156
- DOI: 10.1049/el:19680120
- Type: Article
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p.
155
–156
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A method, accurate to second order in small quantities, is described for estimating the Faraday rotation occurring along a radar propagation path, from radar scattering-matrix measurements. The estimation procedure contains a built-in check on its accuracy.
Calculation of the bandshape factor of a piezoelectric thin-film transducer
- Author(s): J. Trotel ; E. Dieulesaint ; B. Autin
- Source: Electronics Letters, Volume 4, Issue 8, p. 156 –157
- DOI: 10.1049/el:19680121
- Type: Article
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p.
156
–157
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This analysis examines the mechanical bandwidth of a particular transducer structure and gives a way to deduce the electrical bandwidth of the whole system from the electrical components of the circuit and the mechanical bandwidth. An example is given for a cadmium-sulphide transducer on sapphire with a gold intermediate electrode.
Generalised Cheby̅shev lowpass filters
- Author(s): R.A. Wood and N.B. Jones
- Source: Electronics Letters, Volume 4, Issue 8, p. 158 –159
- DOI: 10.1049/el:19680122
- Type: Article
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p.
158
–159
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An expression is presented from which the pole positions of any shifted Cheby̅shev lowpass filter can be evaluated. The standard Cheby̅shev filters are shown to be special cases.
Algebraic relations between system response and system parameters for linear time-invariant systems
- Author(s): E.V. Bohn and B. Sarkar
- Source: Electronics Letters, Volume 4, Issue 8, p. 159 –161
- DOI: 10.1049/el:19680123
- Type: Article
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p.
159
–161
(3)
By means of a rational-fraction approximation to the delay function, and through use of a generalised technique for evaluating convolution integrals, it is possible to approximately evaluate the inverse Laplace transform. The time-domain response is approximated by a ratio of polynomials in t, with coefficients which are algebraic functions of the system parameters.
Characteristics of an electrometric amplifier using a varactor diode
- Author(s): J. Bajon
- Source: Electronics Letters, Volume 4, Issue 8, p. 161 –163
- DOI: 10.1049/el:19680124
- Type: Article
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p.
161
–163
(3)
An analysis method of an electrometric amplifier using two pumped low-reverse-current silicon diodes is described. First, a mathematical model representing the i(v) characteristic near the zero, where the surface effects are the most important, is proposed. Then, from this general model, both input resistance and amplifier-sensitivity coefficients are calculated.
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