Online ISSN
1350-911X
Print ISSN
0013-5194
Electronics Letters
Volume 7, Issue 22, 4 November 1971
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Volume 7, Issue 22
4 November 1971
Surface-acoustic-wave reflectors
- Author(s): P.V.H. Sabine
- Source: Electronics Letters, Volume 7, Issue 22, p. 653 –654
- DOI: 10.1049/el:19710446
- Type: Article
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p.
653
–654
(2)
The technique of reflecting surface acoustic waves by periodic mass loading of the substrate surface is described. Experimental results are presented for a particular microsonic coupler using this interaction.
Space-diversity reception for v.h.f. mobile radio
- Author(s): P.A. Ratliff ; J.D. Parsons ; E.D.R. Shearman
- Source: Electronics Letters, Volume 7, Issue 22, p. 655 –656
- DOI: 10.1049/el:19710447
- Type: Article
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p.
655
–656
(2)
Work on aerial diversity reception to combat multipath fading is described. A 3-channel adaptive array has been built around a conventional v.h.f.–a.m. receiver, and been modified to measure signal amplitudes and relative phases. Experimental results show the effects of typical multipath environments, and the improvement obtained with an adaptive array.
Low-noise room-temperature wideband parametric amplifiers
- Author(s): J.C. Vokes ; J.R. Dawsey ; H.A. Deadman
- Source: Electronics Letters, Volume 7, Issue 22, p. 657 –658
- DOI: 10.1049/el:19710448
- Type: Article
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p.
657
–658
(2)
Two room-temperature parametric amplifiers are described which have gains of 26 dB. One has an excess noise temperature of between 74 and 85 K across the band 3.7–4.2 GHz, and the other has an excess noise temperature of between 85 and 99 K across the band 7.25–7.75 GHz.
Simple design for UP/DOWN Gray-code counters
- Author(s): J.C. Majithia
- Source: Electronics Letters, Volume 7, Issue 22, p. 658 –659
- DOI: 10.1049/el:19710449
- Type: Article
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p.
658
–659
(2)
A simple design for a presettable UP/DOWN Gray-code counter is described. The design is such that the logic requirements for the UP mode are identical to those for the DOWN mode, a single AND/OR gate being the only addition to the entire counter. Furthermore, since the logic between any two consecutive stages remains unaltered, the counter can be readily extended for larger numbers of bits. A typical application of the UP/DOWN feature is in Gray-code addition/subtraction.
Influence of a transmission line on the noise spectra of cavity-stabilised oscillators
- Author(s): K. Schünemann and B. Schiek
- Source: Electronics Letters, Volume 7, Issue 22, p. 659 –661
- DOI: 10.1049/el:19710450
- Type: Article
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p.
659
–661
(3)
The influence of a transmission line between oscillator and stabilising cavity on the a.m. and f.m. noise spectra of microwave oscillators is investigated both theoretically and experimentally. The line length strongly affects the f.m. noise, whereas the a.m. noise remains unchanged.
Dual-gate gallium-arsenide microwave field-effect transistor
- Author(s): J.A. Turner ; A.J. Waller ; E. Kelly ; D. Parker
- Source: Electronics Letters, Volume 7, Issue 22, p. 661 –662
- DOI: 10.1049/el:19710451
- Type: Article
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p.
661
–662
(2)
Dual-gate gallium-arsenide field-effect transistors have been fabricated which give power gains greater than those which can be obtained from single-gate devices of similar gate length. Unconditionally stable gains in excess of 12 dB at 5 GHz have been measured for these devices.
Estimating frequency-response function using periodic signals and the f.f.t.
- Author(s): S.T. Nichols and L.P. Dennis
- Source: Electronics Letters, Volume 7, Issue 22, p. 662 –663
- DOI: 10.1049/el:19710452
- Type: Article
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662
–663
(2)
A technique for estimating a frequency-response function using a periodic pseudorandom binary sequence which is compatible with the fast-Fourier-transform algorithm is presented. A method of synchronising the p.r.b.s. and the sampling for the f.f.t. using a single clock source and two binary counters is described. A simple check on the synchronisations and the identification of an 8th-order lowpass Butterworth filter is provided.
Decoding of b.c.h. codes
- Author(s): George I. Davida
- Source: Electronics Letters, Volume 7, Issue 22, page: 664 –664
- DOI: 10.1049/el:19710453
- Type: Article
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p.
664
(1)
A new algorithm is given for the decoding of double-error-correcting binary b.c.h. codes. It can be rather simply implemented and is particularly suitable for parallel implementation.
Nonbinary negacyclic code which exceeds Berlekamp's (p–1)/2 bound
- Author(s): R.G. Kelsch and D.H. Green
- Source: Electronics Letters, Volume 7, Issue 22, p. 664 –665
- DOI: 10.1049/el:19710454
- Type: Article
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p.
664
–665
(2)
An unsolved problem in coding theory is the determination of p-nary codes in the Lee metric which will correct more than (p–1)/2 errors. This letter describes a ternary double-error-correcting code which exceeds this bound and which leads to a conjecture for doubling this bound in the general p-nary case, p being a prime.
Efficiency of a stepped reflector when fed from an off-axis source
- Author(s): G. Poulton
- Source: Electronics Letters, Volume 7, Issue 22, p. 666 –667
- DOI: 10.1049/el:19710455
- Type: Article
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p.
666
–667
(2)
A correlation technique has been used to find the efficiency of a stepped reflector, given the focal-region field and the aperture field of the feed. The scanning properties of the antenna predicted by this theory agree well with existing experimental data.
Noise measure of metal-semiconductor–metal Schottky-barrier microwave diodes
- Author(s): H.A. Haus ; H. Statz ; R.A. Pucel
- Source: Electronics Letters, Volume 7, Issue 22, p. 667 –669
- DOI: 10.1049/el:19710456
- Type: Article
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p.
667
–669
(3)
We calculate the impedance and noise measure of metal–semiconductor–metal (m.s.m.) microwave diodes. Assuming that the noise is caused by space-charge-smoothed shot noise accompanying the d.c. bias current, one comes to the conclusion that noise measures less than unity are possible. If shot noise is the main contributing noise source, then m.s.m. diodes should become extremely low-noise microwave oscillators and amplifiers.
Radiation patterns of paraboloid with log-periodic dipole feed
- Author(s): P.A. McInnes ; E.W. Munro ; A.J.T. Whitaker
- Source: Electronics Letters, Volume 7, Issue 22, p. 669 –671
- DOI: 10.1049/el:19710457
- Type: Article
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p.
669
–671
(3)
The effect of axial displacement of phase centre on the secondary performance of a parabolic reflector is described, with particular reference to a log-periodic dipole-array feed. Computed and experimental results are presented.
Gain of narrow-flare-angle scalar feed with arbitrary length
- Author(s): H.K. Au
- Source: Electronics Letters, Volume 7, Issue 22, p. 671 –672
- DOI: 10.1049/el:19710458
- Type: Article
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p.
671
–672
(2)
An expression for the radiation pattern of a narrow-flare-angle scalar feed is derived. The theoretical variation of the gain of the horn with respect to its length and flare semiangle is also shown.
Realisation of impedances Kpn
- Author(s): A.G.J. Holt
- Source: Electronics Letters, Volume 7, Issue 22, p. 672 –674
- DOI: 10.1049/el:19710459
- Type: Article
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p.
672
–674
(3)
This letter describes a single-loop feedback circuit presenting a driving-point impedance of the form Kpn over a frequency range ω < ω0, where ω0 is chosen in the design. The stability of the circuit is discussed in terms of rate of closure of the Bode plots of open-loop voltage gain and the reciprocal of the feedback factor.
Narrow-bandwidth Rayleigh-wave filters
- Author(s): P. Hartemann
- Source: Electronics Letters, Volume 7, Issue 22, p. 674 –675
- DOI: 10.1049/el:19710460
- Type: Article
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p.
674
–675
(2)
In order to obtain a 50 kHz bandwidth at 102 MHz with an interdigital delay-time filter, the transducers are made of a succession of elementary combs separated by an integer multiple of the acoustical wavelength. The frequency response of such a filter having two identical transducers consists of a sequence of transmission peaks, each having a bandwidth of about 50 kHz. When the two transducers are not identical, it is possible to obtain a frequency response with a small number of peaks. Such a filter is obtained when the spacing between adjacent elementary combs of each transducer is a different integer multiple of the acoustical wavelength. The design of several filters is described and some measured characteristics are presented.
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