Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 5, Issue 18, 4 September 1969
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Volume 5, Issue 18
4 September 1969
Transient frequency response of transmittance-peaked i.f. filters with application to null-zone detection
- Author(s): N.J. Sullivan and A.G. Heaton
- Source: Electronics Letters, Volume 5, Issue 18, p. 423 –425
- DOI: 10.1049/el:19690322
- Type: Article
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p.
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–425
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A binary f.s.k. system, where the i.f. filter has transmittance peaks at two frequencies separated by a large distance in comparison to the bit rate, is considered. Experimental confirmation of the system transient response when the filters are third-order Butterworth is presented. A brief discussion of the error probability of such a system, and a possible application of the nature of the transient response to allow null-zone detection, is given.
Comparison of tem with waveguide-below-cutoff resonators
- Author(s): M.K. McPhun
- Source: Electronics Letters, Volume 5, Issue 18, p. 425 –426
- DOI: 10.1049/el:19690323
- Type: Article
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p.
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–426
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An alternative way of looking at waveguide-below-cutoff resonators for tuning active devices is considered. By treating the circuit as a TEM transmission-line resonator, a simple design technique is possible. Tuning is shown to be accomplished by varying the characteristic impedance of the TEM line. A simple way of obtaining a large increase in the mechanical tuning range is suggested.
Delay analysis of a magnetoelastic delay line by field pulsing
- Author(s): B. Désormière and F. Furst
- Source: Electronics Letters, Volume 5, Issue 18, p. 426 –427
- DOI: 10.1049/el:19690324
- Type: Article
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Direct measurements of the spin and elastic contributions to the magnetoelastic delay are reported. These experiments use the fact that spin waves are frequency-shifted by a field step. Comparison with theory is shown to be satisfactory.
Fast decimal-binary conversion
- Author(s): H.H. Guild
- Source: Electronics Letters, Volume 5, Issue 18, p. 427 –428
- DOI: 10.1049/el:19690325
- Type: Article
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A fast combinational iterative array is described which may be used, with simple additional gating, to convert data in 8421 or 2421 binary-decimal code into binary code. The array cells, which have a simple interconnection pattern, are currently available as medium-scale integration devices.
Improved method of measurement of transient load angle
- Author(s): J.L.T. Exon
- Source: Electronics Letters, Volume 5, Issue 18, p. 428 –429
- DOI: 10.1049/el:19690326
- Type: Article
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A new method of measuring transient load angle of a synchronous machine system is described which self-compensates for the variation of base frequency of the system. The measurement system was designed for use with an ultraviolet recorder.
Effect of boundary conditions on the propagation of surface magnetostatic waves in a transversely magnetised thin y.i.g. slab
- Author(s): P. Young
- Source: Electronics Letters, Volume 5, Issue 18, p. 429 –431
- DOI: 10.1049/el:19690327
- Type: Article
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The letter deals with the theory of propagation of surface magnetostatic waves in a transversely magnetised thin y.i.g. slab. The effect of boundary conditions on the propagation characteristics of these waves are emphasised. Particular attention is paid to the lowest-order (n=0) mode.
Iterative array for the reprocessing of hand-printed characters
- Author(s): J. Chalmers and A. Stein
- Source: Electronics Letters, Volume 5, Issue 18, p. 431 –433
- DOI: 10.1049/el:19690328
- Type: Article
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An iterative array for processing hand-printed alphanumeric characters and graphical constructs is described. The organisation of the array, the structure of the component cells and the results of simulation experiments are discussed.
Improved method of measuring the load angle of synchronous machines
- Author(s): H.Q. Jänsch and I.R. Smith
- Source: Electronics Letters, Volume 5, Issue 18, p. 433 –435
- DOI: 10.1049/el:19690329
- Type: Article
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A method is presented for measuring the load angle of a synchronous machine, which has a time delay much shorter than methods previously described. In addition, a signal suitable for control and recording purposes is available with a minimum of further delay.
Improved technique for voltage measurement in the scanning-electron microscope
- Author(s): J.P. Fleming and E.W. Ward
- Source: Electronics Letters, Volume 5, Issue 18, p. 435 –436
- DOI: 10.1049/el:19690330
- Type: Article
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Some preliminary results from experiments designed to lead to quantitative voltage measurement in the scanning-electron microscope are presented. The experimental technique is based on the use of a control loop which stabilises the operating conditions of the secondary-electron collector of the scanning-electron microscope by appropriately defining the voltage at the output lead of the specimen. This technique has already been described, and a version of it has been used for quantitative voltage measurement with a low-energy electron beam. The results described here show improvement in linearity and extension of useful dynamic range of the standard secondary-electron collector system provided in the ‘Stereo-scan’ electron microscope.
Combined pulse-modulation scheme for feedback systems
- Author(s): M.A. Pai and M.S. Varadarajan
- Source: Electronics Letters, Volume 5, Issue 18, p. 436 –438
- DOI: 10.1049/el:19690331
- Type: Article
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A new form of combined pulse modulator using integral pulse-frequency modulation and pulse-width modulation is proposed in the letter. Using this modulator in a feedback system, a nonlinear discrete equivalent system is established, and a method for computation of state trajectories is indicated. It is also shown that systems having pulse-frequency modulation only or pulse-width modulation only reduce to special cases.
Method of measuring time delay
- Author(s): G.G. Gouriet
- Source: Electronics Letters, Volume 5, Issue 18, p. 438 –439
- DOI: 10.1049/el:19690332
- Type: Article
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The propagation time of a linear system, defined as the group delay at zero frequency, is given by the time centroid of its response to unit impulse. Based on this, a method of measurement is described which is independent of the shape of either the input or output time functions.
Notched stripline resonator
- Author(s): T.K. Ishii and P.K. Moldovan
- Source: Electronics Letters, Volume 5, Issue 18, p. 439 –440
- DOI: 10.1049/el:19690333
- Type: Article
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A new type of stripline resonator is introduced. This is a compact microstrip resonator separated by a pair of notches from the feeder line. The width of the resonator is equal to, or smaller than, the feeder line. The resonator is suitable for d.c. biasing for various applications.
Influence of clipping during signal detection by crosscorrelation method
- Author(s): S. Braun
- Source: Electronics Letters, Volume 5, Issue 18, p. 440 –441
- DOI: 10.1049/el:19690334
- Type: Article
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The crosscorrelation of a harmonic signal buried in severe noise with another of the same frequency decreases by a constant factor when clipping occurs. Calculation of this factor for a Gaussian noise shows that signal detection may be enhanced by a factor of 2.3 by overdriving the measuring channel.
Iterative procedure for determining the best control-weighting matrix
- Author(s): M.A. Hassan
- Source: Electronics Letters, Volume 5, Issue 18, p. 441 –442
- DOI: 10.1049/el:19690335
- Type: Article
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For the linear-plant quadratic-cost optimal-regulator problems a sequential digital-computer procedure is given to choose the best value of the control-weighting matrix elements without violating the imposed amplitude constraints on the control signals.
Erratum: Enumeration of all cutsets of a graph
- Author(s): K.S. Rao ; V.V.B. Rao ; P. Sankaran ; V.G.K. Murti
- Source: Electronics Letters, Volume 5, Issue 18, page: 442 –442
- DOI: 10.1049/el:19690336
- Type: Article
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