Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 10, Issue 19, 19 September 1974
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Volume 10, Issue 19
19 September 1974
Improvements in coherent f.s.k. performance
- Author(s): M. Tomlinson and A.E. Methiwalla
- Source: Electronics Letters, Volume 10, Issue 19, p. 393 –394
- DOI: 10.1049/el:19740312
- Type: Article
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p.
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–394
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It is shown that, provided that the phases of the mark and space frequencies are constant and satisfy a simple relationship, a filtered t.s.k. signal becomes a 2-phase p.s.k. signal, and may be coherently detected. Using a practical filter, the performance is within 2.2 dB of ideal p.s.k.
Testing lightning-flash counters with step-function voltages
- Author(s): D. MacKerras
- Source: Electronics Letters, Volume 10, Issue 19, p. 394 –395
- DOI: 10.1049/el:19740313
- Type: Article
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p.
394
–395
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The lightning-flash counter sponsored by CIGREÉ is normally tested with sinusoidal alternating voltages at three frequencies: 100, 500 and 2500 Hz. An alternative method of testing with step-function voltages is proposed. It is shown that this method is simpler to carry out, both in the laboratory and in the field, and a design for a suitable signal source is presented. As lightning-flash counters of the CIGREÉ type are intended to respond to the sudden positive-going changes in the elctric field caused by lightning flashes to ground, it is claimed that the step-function-voltage test is more appropriate than the sinusoidal-voltage test, and thet more consistent results may be obtained if the step-function-voltage test is adopted.
High-frequency operation of surface-acoustic-wave muiltielectrode transducers
- Author(s): H. Engan
- Source: Electronics Letters, Volume 10, Issue 19, p. 395 –396
- DOI: 10.1049/el:19740314
- Type: Article
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p.
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–396
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The operation of transducers with more than two electrodes per electrical period is disussed. When two different structures are used for input and output transducers, the frequency responses can be made to overlap at one desired band of frequencies, while reducing other surface-and bulk-wave responses.
Increased-bandwidth resonant slot array with bidirectional radiation pattern
- Author(s): M. Orefice
- Source: Electronics Letters, Volume 10, Issue 19, p. 396 –397
- DOI: 10.1049/el:19740315
- Type: Article
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p.
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–397
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A resonant slot array with a bidirectional radiation pattern and an impedance bandwidth of more that 15% has been realized by measuring the admittance of a couple of longitudinal shunt slots on the opposite walls of the waveguide, and then optimizing the reflection coefficient of the equivalent network of the array in the desired frequency range.
Nonrecursive digital filters with crescent ripple
- Author(s): L.G. Cuthbert
- Source: Electronics Letters, Volume 10, Issue 19, p. 397 –399
- DOI: 10.1049/el:19740316
- Type: Article
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–399
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The letter describes the results obtained on designing nonrecursive digital filters having crescent ripple. It is shown that the geometric mean of the maximum passband ripple and the maximum stopband ripple, when plotted against the normalized transition bandwidth, give a similar curve to that obtained for equiripple designs.
Utilisation factior of a waveguidefred slot array
- Author(s): M. Sinha
- Source: Electronics Letters, Volume 10, Issue 19, p. 399 –400
- DOI: 10.1049/el:19740317
- Type: Article
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The distribution of the amplitude excitation of a waveguide-fed slot array has been found as a sum of two exponentials by numerical methods. The corresponding expression for the utilization factor, the ration of actual again to 4L/ λ, has been derived. The variation in amplitude distribution and the utilization with frequency have been computed for a 2/-element slot array. Only loose coupling of each element with the waveguide is considered.
Low/high-profile TRAPATT structure
- Author(s): H. Goronkin
- Source: Electronics Letters, Volume 10, Issue 19, p. 400 –402
- DOI: 10.1049/el:19740318
- Type: Article
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–402
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The letter investigates methods of reducing the threshold current density for long pulse operation, while maintaining high power and efficiency.
Velocity/field characteristic of GaxIn1−xSb calculated by the Monte Carlo method
- Author(s): K. Salai ; T. Ikoma ; Y. Adachi ; H. Yanai
- Source: Electronics Letters, Volume 10, Issue 19, p. 402 –403
- DOI: 10.1049/el:19740319
- Type: Article
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The velocity/field characteristics of GaxIn1−xSb are calculated by the Monte Carlo method for x= 0.3 to 1.0. The effects of temperature and ionized-impurity scattering are also taken into account. Ga0.5In0.5Sb is shown to be the most suitable, material for low-power dissipation transferred-electron devices.
New definitions for loudness ratings
- Author(s): D.L. Richards and J. Hutter
- Source: Electronics Letters, Volume 10, Issue 19, p. 403 –405
- DOI: 10.1049/el:19740320
- Type: Article
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A method is described for treating frequency-dependent transmission losses of junction and trunks in a telephone connection so that the sum of the loudness ratings of the elements provides a good approximation to the true overall loudness rating. The method is compatible with that described elsewhere for defining sending and receiving loudness rating.
Kron's link-at-a-time formula
- Author(s): R.K. Jarrott
- Source: Electronics Letters, Volume 10, Issue 19, p. 405 –406
- DOI: 10.1049/el:19740321
- Type: Article
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A short proof of Kron's link-at-a-time formula is given and the applicability and computational effectiveness of the formula are noted. The formula leads to 1st-order sensitivity result that are comparable in efficiency to the adjoint-network methods.
Bandwidth results for liquid-core optical fibres
- Author(s): W.S. Davies and G.P. Kidd
- Source: Electronics Letters, Volume 10, Issue 19, p. 406 –408
- DOI: 10.1049/el:19740322
- Type: Article
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–408
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Bandwidths derived from pulse-dispersion measurements have been obtained as a function of length for tetrachloroethylene-filled samples. The results show that collimated launching and/or detection gives considerable improvements over wide-angle beam excitation and detection for lengths below about 300 m, but little above about 800 m. A degree of agreement is obtained with results for some theoretical models.
Erratum: Multilevel single-error-correcting codes
- Author(s): P.G. Farrell and Z. Al-Bandar
- Source: Electronics Letters, Volume 10, Issue 19, page: 408 –408
- DOI: 10.1049/el:19740323
- Type: Article
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Erratum: Buried-channel c.c.d. models based on a 1-dimensional analysis
- Author(s): H. El-Sissi and R.S.C. Cobbold
- Source: Electronics Letters, Volume 10, Issue 19, page: 408 –408
- DOI: 10.1049/el:19740324
- Type: Article
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Erratum: Logicfree data channels
- Author(s): D. Zissos
- Source: Electronics Letters, Volume 10, Issue 19, page: 408 –408
- DOI: 10.1049/el:19740325
- Type: Article
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p.
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