Radio and Electronic Engineer
Volume 52, Issue 10, October 1982
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Volume 52, Issue 10
October 1982
‘Big Brothers’ wanted
- Source: Radio and Electronic Engineer, Volume 52, Issue 10, page: 443 –443
- DOI: 10.1049/ree.1982.0066
- Type: Article
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p.
443
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Obituary
- Source: Radio and Electronic Engineer, Volume 52, Issue 10, page: 465 –465
- DOI: 10.1049/ree.1982.0067
- Type: Article
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465
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Automatic noise figure measurements with computer control and correction
- Author(s): D.A. Abbott and H.V. Shurmer
- Source: Radio and Electronic Engineer, Volume 52, Issue 10, p. 468 –474
- DOI: 10.1049/ree.1982.0068
- Type: Article
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p.
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–474
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By using computer control and correction, the noise parameters of an amplifying device can be obtained as an immediate display from system noise measurements without the need of having subsequently to make tedious calculations. The means of achieving this are described in the paper, together with results obtained by applying the facility to microwave amplifiers incorporating GaAs f.e.t.devices mounted in microstrip.
A real-time fading simulator for mobile radio
- Author(s): J.R. Ball
- Source: Radio and Electronic Engineer, Volume 52, Issue 10, p. 475 –478
- DOI: 10.1049/ree.1982.0069
- Type: Article
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p.
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–478
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A test equipment for simulating the Rayleigh-distributed fading encountered in mobile radio is described. The fading is achieved by in-phase and quadrature modulation of the radio signal by two independent Gaussian noise signals. The noise formation and filtering are performed using a microprocessor for which the clock frequency can be varied to control the fade rate. The simulator has been designed to handle amplitude modulated signals and is being used in the development of s.s.b. mobile-radio receivers.
Recent developments in scanning acoustic microscopy
- Author(s): D.A. Sinclair ; I.R. Smith ; H.K. Wickramasinghe
- Source: Radio and Electronic Engineer, Volume 52, Issue 10, p. 479 –493
- DOI: 10.1049/ree.1982.0070
- Type: Article
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The operating principles of the Quate-Lemons scanning acoustic microscope and some recent developments in the detection and interpretation of acoustic images are reviewed. In particular the measurement of elastic constants using the microscope, which may ultimately provide a new high resolution technique for material characterization, is demonstrated.
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