Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 4, Issue 12, 14 June 1968
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Volume 4, Issue 12
14 June 1968
Active RC networks using a parallel T
- Author(s): N. Fujii
- Source: Electronics Letters, Volume 4, Issue 12, p. 239 –240
- DOI: 10.1049/el:19680183
- Type: Article
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p.
239
–240
(2)
A method of independent control over the positions of the poles and zeros of an active RC network is described, Secondorder transfer functions can be realised by using these circuits. The adjustments of their characteristics after the construction are very easy. A simple experiment shows good agreement with the theory.
Microwave Gunn oscillator tuned electronically over 1 GHz
- Author(s): B.K. Lee and M.S. Hodgart
- Source: Electronics Letters, Volume 4, Issue 12, p. 240 –242
- DOI: 10.1049/el:19680184
- Type: Article
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p.
240
–242
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A J band Gunn oscillator, tuned by a varactor, has been constructed. It can be mechanically tuned over 3 GHz, and an electronic tuning range of 1 GHz has been achieved with an average power output of 15 mW and less than 1 dB variation.
z transfer functions of sampled-data control systems with a discontinuous error signal
- Author(s): R. Prajoux ; Y. Sevely ; P. Thierry
- Source: Electronics Letters, Volume 4, Issue 12, p. 242 –243
- DOI: 10.1049/el:19680185
- Type: Article
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p.
242
–243
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Sampled-data control systems, of which the open-loop transfer function is such that the corresponding impulse response is discontinuous at the origin, cannot be studied with the usual z formula. The z transfer function of such systems is established when it can be assumed that there is no instantaneous transmission, or when the sampler is not a usual Dirac sampler.
Coupling between mutually orthogonal slot antennas covered by an overdense plasma sheath
- Author(s): P.F. Sforza
- Source: Electronics Letters, Volume 4, Issue 12, p. 243 –244
- DOI: 10.1049/el:19680186
- Type: Article
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p.
243
–244
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Measurements of the isolation between mutually orthogonal slot antennas on the surface of a metal cone covered by an overdense plasma sheath are presented. The measurements show that the isolation is essentially the same for small and large input powers and independent of the antenna used as the transmitter. The results also show that the coupling between antennas is greater in the presence of the plasma sheath.
Influence of environment on the convergence of a learning game-playing machine
- Author(s): D.J. Quarmby
- Source: Electronics Letters, Volume 4, Issue 12, p. 244 –245
- DOI: 10.1049/el:19680187
- Type: Article
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p.
244
–245
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A ‘perceptron-like’ adaptive controller playing the game of ‘nim’ has been studied. The machine learns with no example (teacher) to guide it. Performance is related to the machine's environment (opponent), and a symmetrical arrangement of two learning machines in competition is shown to lead to rapid learning.
Improved near-field discrimination by the use of multiplicative signal processing in c.t.f.m. radar or sonar
- Author(s): D.G. Tucker and M.J. Withers
- Source: Electronics Letters, Volume 4, Issue 12, p. 245 –246
- DOI: 10.1049/el:19680188
- Type: Article
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p.
245
–246
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It is shown that the improved near-field lateral discrimination, already shown to be obtainable in a pulse radar or sonar by the use of multiplicative signal processing, can be obtained in a c.t.f.m. (continuous-transmission frequency-modulated) system.
Dual-mode optical-frequency discriminator
- Author(s): J.W. Mink and J.R. Christian
- Source: Electronics Letters, Volume 4, Issue 12, p. 246 –247
- DOI: 10.1049/el:19680189
- Type: Article
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p.
246
–247
(2)
A dual-mode optical-frequency discriminator is described. Its operation is based on the fact that beam modes in a wave-beam resonator (focused Fabry-Perot) are degenerative modes. This degeneracy is removed by placing a birefringent crystal in the resonator to shift the resonant frequencies of two perpendicularly polarised modes. The desired discriminator response is obtained by detecting each mode separately and then taking the difference of each detector response. Measurements on a dual-mode discriminator are also described.
Resonance-radiation-trapping effects in a pulsed-ion laser
- Author(s): S.A. Husain
- Source: Electronics Letters, Volume 4, Issue 12, p. 248 –249
- DOI: 10.1049/el:19680190
- Type: Article
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p.
248
–249
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In an ionised argon laser, the population inversion largely depends on the shorter lifetime of the 4s2P levels. At extremely high density of Ar+ ground state, the lifetime of the 4s2P levels can be longer. This can destroy the population inversion and produces extremely large absorption of laser lines. This phenomenon has been investigated in a small-bore tube.
Effect of the field dependence of the diffusion constant on small-signal behaviour of bulk negative-mobility devices
- Author(s): Y. Nishimura
- Source: Electronics Letters, Volume 4, Issue 12, p. 249 –250
- DOI: 10.1049/el:19680191
- Type: Article
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p.
249
–250
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Modification of the small-signal behaviour of bulk-semiconductor devices, due to the effective drift velocity resulting from the field dependence of the diffusion constant, is discussed. It is effectively less important at lower doping levels and at higher frequencies.
Generalised resultant
- Author(s): H.H. Rosenbrock
- Source: Electronics Letters, Volume 4, Issue 12, p. 250 –251
- DOI: 10.1049/el:19680192
- Type: Article
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250
–251
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The resultant of two polynomials is generalised and used to compute the least order corresponding to a given transfer-function matrix.
Online digital filtering
- Author(s): A. Buttle ; A.G. Constantinides ; J.E. Brignell
- Source: Electronics Letters, Volume 4, Issue 12, p. 252 –253
- DOI: 10.1049/el:19680193
- Type: Article
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p.
252
–253
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The advantages of the recursive digital filter as a real-time signal processor are stated, and, as an example, a fourth-order Cheby̅shev lowpass filter has been synthetised and programmed into an online computer. Typical responses are shown for pulse, step and low-frequency mixed sinusoidal signals.
Delayed versions of m sequences
- Author(s): J.L. Douce
- Source: Electronics Letters, Volume 4, Issue 12, page: 254 –254
- DOI: 10.1049/el:19680194
- Type: Article
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p.
254
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This letter evaluates the delay introduced by performing a specified linear operation on the contents of a shift register connected to generate a maximum-length sequence. Examples for the binary and 5-level cases are included.
Scattering parameters of the 180° hybrid ring
- Author(s): G. Luzzatto
- Source: Electronics Letters, Volume 4, Issue 12, p. 254 –255
- DOI: 10.1049/el:19680195
- Type: Article
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p.
254
–255
(2)
It is shown that a particular relation between the scattering parameters of the symmetric hybrid junctions holds even for the ‘rat-race’ hybrid, which is not included in this class of hybrid junctions.
Elimination of quadratic drift errors in system identification by pseudorandom binary signals
- Author(s): H.A. Barker
- Source: Electronics Letters, Volume 4, Issue 12, p. 255 –256
- DOI: 10.1049/el:19680196
- Type: Article
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p.
255
–256
(2)
Use of the reference phase of a pseudorandom binary signal in a linearly weighted crosscorrelation is shown to result in the elimination of errors due to both linear and quadratic disturbances in the estimation of a system weighting function.
Evaluation of topological formulas using digital computers
- Author(s): F. Rode and S.P. Chan
- Source: Electronics Letters, Volume 4, Issue 12, p. 256 –258
- DOI: 10.1049/el:19680197
- Type: Article
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p.
256
–258
(3)
Recently Chan and Chan modified the formulas of Mayeda and Seshu for digital computation using nine sets of trees for obtaining all the necessary factors in the expressions. In addition, a tree-finding algorithm is developed for computing all trees of a network without duplication.
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