Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 2, 26 January 1968
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Volume 4, Issue 2
26 January 1968
Versatile and accurate method of group-delay measurement
- Author(s): R.K.P. Galpin
- Source: Electronics Letters, Volume 4, Issue 2, p. 23 –24
- DOI: 10.1049/el:19680019
- Type: Article
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Instruments at present available for measuring group delay are either highly complex (and hence expensive) or offer a limited range of operation and reduced accuracy. This limitation is due to the use of a fixed modulating frequency, which, it is argued here, is an unnecessary restriction. A simple (and hence inexpensive) arrangement is proposed and described, which is capable of measuring group delay over a wide frequency range (100Hz–2MHz) with high accuracy (up to 1 μs) using a modulating frequency which is adjustable from 10 Hz to 1 kHz.
Stable broadband variable noise source for microwave radiometry
- Author(s): D.L. Hollway and P.I. Somlo
- Source: Electronics Letters, Volume 4, Issue 2, p. 24 –25
- DOI: 10.1049/el:19680020
- Type: Article
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A stable broadband microwave reference noise source has been designed using, as radiating elements, carbon-filament indicator lamps mounted in a waveguide. When used as a reference in an accurate radiometer, in place of a gas tube and attenuator, this source has a number of advantages. It is electronically controllable, insensitive to ambient temperature changes and the output may be set to match exactly any hot-load absolute standard of noise.
Active filters using a predistortion technique
- Author(s): B. Wise
- Source: Electronics Letters, Volume 4, Issue 2, p. 25 –26
- DOI: 10.1049/el:19680021
- Type: Article
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A method is described of converting passive predistorted ladder networks to active equivalents.
A.C. voltage regulation by means of chopper circuits
- Author(s): A. Emanuel-Eigeles and J. Appelbaum
- Source: Electronics Letters, Volume 4, Issue 2, p. 26 –28
- DOI: 10.1049/el:19680022
- Type: Article
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An a.c. voltage-regulation method is described, based on the principle of both forced ignition and extinction of thyristors acting as switches. This method was found more efficient than the conventional one, assuring a higher power factor for inductive loads.
Simple voltage-to-frequency convertor with increased frequency range
- Author(s): S. Tesic
- Source: Electronics Letters, Volume 4, Issue 2, p. 28 –29
- DOI: 10.1049/el:19680023
- Type: Article
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Conventional free-running multivibrators are frequently used as voltage-to-frequency convertors, although the fmax/fmin ratio of this circuit is rather small. A free-running multivibrator with complementary transistors has advantages concerning this ratio as well as regards some other convertor parameters.
Resonantly h.f.-sustained plasma around an antenna
- Author(s): A.M. Messiaen ; P.E. Vandenplas ; G. Peter
- Source: Electronics Letters, Volume 4, Issue 2, p. 29 –31
- DOI: 10.1049/el:19680024
- Type: Article
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When sufficient h.f. power is fed to a plasma-coated antenna, the plasma becomes resonantly sustained. The superposition of the resonance patterns at frequencies ω, 2ω and 3ω is investigated, and it explains most of the observed facts.
Frequency-modulated single-mode laser
- Author(s): J. Kupka
- Source: Electronics Letters, Volume 4, Issue 2, p. 31 –32
- DOI: 10.1049/el:19680025
- Type: Article
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Three frequency-modulated single-mode lasers employing long multicavity resonators are presented. The f.m. is achieved by simultaneous changes of the length of the additional cavities in such a way that resonance conditions are preserved, and the resonator Q factor remains constant. The linear electro-optic Pockels effect in KDP crystals is used to change the optical length of the additional cavities.
Simple repeater for frequency-modulated signals using transferred-electron oscillators
- Author(s): S.V. Judd
- Source: Electronics Letters, Volume 4, Issue 2, page: 33 –33
- DOI: 10.1049/el:19680026
- Type: Article
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This letter presents preliminary results obtained from an injection-locked Gunn oscillator operating as an amplifier for frequency-modulated signals.
New results for time averages as statistical averages
- Author(s): H.E. Hanrahan
- Source: Electronics Letters, Volume 4, Issue 2, p. 34 –35
- DOI: 10.1049/el:19680027
- Type: Article
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New results are presented for time averages as statistical averages. Expressions contain cumulative distribution functions rather than probability-density functions. Cases considered are f{x(t)} and g{x(t), y(t)}, where x(t) and y(t) are time sequences. Results are given for mean value, meansquare value and correlation coefficient. Sources of error are discussed.
Silicon ‘punch-through’ diode
- Author(s): E.B. Kuchis and G.T. Wright
- Source: Electronics Letters, Volume 4, Issue 2, p. 35 –37
- DOI: 10.1049/el:19680028
- Type: Article
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The large-signal a.c. characteristics of trap-controlled space-charge-limited current in silicon are described. At high frequencies, trapping is stationary and current occurs only when the applied signal voltage exceeds a threshold. Characteristics may be symmetrical or rectifying. Device capacitance is small and constant. Extremely sharp ‘turn-on’ and ‘turn-off’ of current is predicted with response times of the order of 5 ps. Device construction is simple and applications in microwave systems are envisaged.
Tunable active allpass sections
- Author(s): A.G.J. Holt and J.P. Gray
- Source: Electronics Letters, Volume 4, Issue 2, p. 37 –38
- DOI: 10.1049/el:19680029
- Type: Article
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Two second-order allpass circuits are described, realising a pair of complex poles (and matching zeros) by analogue simulation. The group-delay response can be made to be essentially dependent on only two network parameters whose values can be selected to ‘tune’ to a particular characteristic.
Calculation of the harmonic components of the voltage in hybrid circuits utilising tunnel diodes and transistors
- Author(s): A.Y. Spasov
- Source: Electronics Letters, Volume 4, Issue 2, p. 38 –39
- DOI: 10.1049/el:19680030
- Type: Article
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This letter deals with the harmonic composition of the oscillating circuit voltage in hybrid circuits utilising tunnel diodes and transistors. It is shown that the nonlinearity of the p–n junction capacitance of tunnel diodes and transistors increases the higher-voltage harmonics. When the p–n junction is well defined, the value of the second harmonic, which only occurs because of the nonlinearity of the p–n junction capacitance, may be 12–15% of the first harmonic's amplitude. Comparison between theoretical and experimental results is given.
Aperture coupling in cylindrical dielectric-rod antennas
- Author(s): J.R. James
- Source: Electronics Letters, Volume 4, Issue 2, p. 39 –41
- DOI: 10.1049/el:19680031
- Type: Article
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Computed and measured data show that mutual coupling between the launcher and rod-end apertures of a uniform cylindrical dielectric-rod antenna is responsible for certain second-order effects in the radiation pattern. The synthesis of a smooth tapered dielectric antenna by a stepped profile and complications arising from interstep coupling are also discussed.
Erratum: Pulsed frequency-response calculations for a digital control system
- Author(s): R. Edwards
- Source: Electronics Letters, Volume 4, Issue 2, page: 41 –41
- DOI: 10.1049/el:19680032
- Type: Article
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Erratum: Negative-impulse breakdown in compressed air
- Author(s): G.R. Govinda Raju and C.S. Lakshmi Narasimha
- Source: Electronics Letters, Volume 4, Issue 2, page: 41 –41
- DOI: 10.1049/el:19680033
- Type: Article
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Erratum: Window functions for nonrecursive digital filters
- Author(s): C. Rossi
- Source: Electronics Letters, Volume 4, Issue 2, page: 41 –41
- DOI: 10.1049/el:19680034
- Type: Article
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