Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 1, 9 January 1969
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Volume 1 (1965)
Volume 5, Issue 1
9 January 1969
Sectoral hoghorn: a new form of line feed for spherical reflector aerials
- Author(s): T. Pratt and E.D.R. Shearman
- Source: Electronics Letters, Volume 5, Issue 1, p. 1 –2
- DOI: 10.1049/el:19690001
- Type: Article
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A sectoral hoghorn may be used as a line feed to correct spherical aberration in an offset spherical reflector. The bandwidth of this type of feed is considerably greater than that of other line feeds, and the construction is simple. The results of measurements on a prototype X band hoghorn are reported, and a technique for reducing the area of spherical reflector required for a given scan angle is described.
Effect of resonant load on moding of a CdS acoustoelectric oscillator
- Author(s): A.K. Sharma ; M.G.F. Wilson ; E.A. Ash
- Source: Electronics Letters, Volume 5, Issue 1, p. 2 –4
- DOI: 10.1049/el:19690002
- Type: Article
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The acoustoelectric oscillator is known to oscillate in a number of modes simultaneously when subjected to a pulsed direct voltage. A reactive load in the external circuit is found to restrict the output of the oscillator to a single mode.
Effect of incidental modulation in systems employing pseudorandom codes
- Author(s): N. Lichtenstein and S. Rauch
- Source: Electronics Letters, Volume 5, Issue 1, p. 4 –6
- DOI: 10.1049/el:19690003
- Type: Article
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The effect of incidental modulation on accuracy, signal loss and sensitivity of systems that employ pseudorandom codes is evaluated. It is shown that the performance obtained depends on the manner in which the radio-frequency carrier is modulated and demodulated.
Optimisation of efficiency of shallow reflectors
- Author(s): V.T. Bao
- Source: Electronics Letters, Volume 5, Issue 1, p. 6 –7
- DOI: 10.1049/el:19690004
- Type: Article
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A brief discussion of Potter's method of obtaining the theoretical maximum efficiency for paraboloidal reflector antennas is presented. It is shown that Potter's results are too optimistic, and more realistic results are obtained by matching the total field in the focal plane by an appropriate combination of hybrid modes. The letter presents an analytical method of obtaining the optimum mode combination for shallow reflectors.
Q dependence of IMPATT-diode f.m. noise
- Author(s): W. Harth and G. Ulrich
- Source: Electronics Letters, Volume 5, Issue 1, p. 7 –8
- DOI: 10.1049/el:19690005
- Type: Article
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Measurement of IMPATT-diode-oscillator f.m. noise, for external Q factors ranging between 100 and 10 000, showed that the product of r.m.s. frequency deviation and square root of power output is inversely proportional to the Q factor, in accordance with the Edson formula for f.m. oscillator noise. The excess-noise temperature, varying between 30 and 50dB, rapidly increases with current through the diode. The correlation for f.m. and a.m. noise lies between 0.8 and 1.
Multiring-antenna arrays
- Author(s): E. Borchi and V. Cappellini
- Source: Electronics Letters, Volume 5, Issue 1, p. 9 –10
- DOI: 10.1049/el:19690006
- Type: Article
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Multiring-antenna arrays are considered, particularly for space telemetry and communication. The configuration with two concentric rings is examined. The distant electric field, the radiation resistance, the directive gain and the mutual-coupling impedances are derived. Numerical results are given for arrays with eight monopoles in each ring.
N-path filters in which the switched filters are not lowpass sections
- Author(s): G.P. Edwards
- Source: Electronics Letters, Volume 5, Issue 1, p. 10 –12
- DOI: 10.1049/el:19690007
- Type: Article
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It is shown that the generalised transfer function for switched networks, derived by Acampora, is only valid when the circuits being switched are filters whose transfer functions have negligible magnitude above half the switching frequency.
Variable-bandwidth filters using switching
- Author(s): G.P. Edwards
- Source: Electronics Letters, Volume 5, Issue 1, p. 12 –13
- DOI: 10.1049/el:19690008
- Type: Article
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It is shown that, if a switching technique is used to scale the bandwidth of a lowpass filter, the resultant circuit has some of the characteristics of an N-path filter. The consequence of this is that the signal frequency must be bandlimited to avoid spurious responses at the switching frequency and its harmonics.
Improved method of analysing nonlinear electrical networks
- Author(s): T.B.M. Neill
- Source: Electronics Letters, Volume 5, Issue 1, p. 13 –15
- DOI: 10.1049/el:19690009
- Type: Article
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If the nonlinear differential equations of circuit analysis are formulated as Volterra integral equations, the fast Fourier transform may be used to obtain a solution. The method is faster and more powerful than existing techniques, particularly when the steady-state response to a periodic driving force is required.
Fourier-series drift correction in periodic crosscorrelation schemes
- Author(s): R.F. Brown
- Source: Electronics Letters, Volume 5, Issue 1, page: 15 –15
- DOI: 10.1049/el:19690010
- Type: Article
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It has recently been shown that polynomial-type output drift may be exactly compensated, up to the rth order, by crosscorrelating over r + 2 half periods of a periodic sequence of inverse-repeat form, where binomially distributed weights are associated with each half period. It is pointed out that the a.c. components of a Fourier-series expansion of output drift may be exactly compensated up to the qth harmonic by crosscorrelating over q + 1 periods of a periodic sequence (not necessarily of inverse-repeat form), where uniformly distributed weights are associated with each period. If the sequence is of inverse-repeat form, the d.c. component is also compensated.
Ambipolar/free-diffusion transition
- Author(s): K.G. Emeleus
- Source: Electronics Letters, Volume 5, Issue 1, p. 15 –16
- DOI: 10.1049/el:19690011
- Type: Article
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An example of the transition from ambipolar to free diffusion is described in a low-charge-density Faraday dark space. The difficulty of obtaining reliable probe data under such conditions is noted.
Effet du sens de croissance du champ électrique sur les conditions de claquage par avalanche (Directional effect of electric-field growth on a avalanche-breakdown conditions)
- Author(s): J. Urgell
- Source: Electronics Letters, Volume 5, Issue 1, p. 16 –18
- DOI: 10.1049/el:19690012
- Type: Article
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A mathematical analysis is presented showing how equality or inequality of the avalanche breakdown voltage of two complementary p-n junctions can be determined. For this analysis, the field-dependence laws of α and β are assumed to be known.
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