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Detection and measurement of radio frequency feedback for an on‐frequency repeater
International Journal of Communication Systems, 2017SummaryThe radio frequency feedback (RFF) occurs when the insulation is insufficient between the antennas of an on‐frequency repeater, increasing digital transmission errors. In addition, a strong RFF could compromise system stability of the on‐frequency repeater because of the growing power in the closed‐loop.
Zeher, Amar +2 more
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Linearity of radio-frequency transducers
Medical & Biological Engineering & Computing, 1977The paper outlines a method of monitoring changes in joint angle for a 2-dimensional movement of the limbs. The transducer described is acceptably linear over a range of 100°. It provides a useful alternative to goniometry in situations where the attachment of a goniometer across the joint would cause undue interference to the movement being studied ...
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Radio fuzzy graphs and assignment of frequency in radio stations
Computational and Applied Mathematics, 2019zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Rupkumar Mahapatra +3 more
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Heating of radio-frequency cables
Electrical Engineering, 1949IN CONSIDERING the heating of radio-frequency cables due to internal causes, there first must be determined the distribution and intensity of the generation of heat caused by the conductor and dielectric losses. Then the diffusion of the heat throughout the cable and its dissipation at the surface are considered in order to determine the resulting ...
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Frequency Errors in Radio-Frequency Ammeters
Proceedings of the IRE, 1937This paper discusses from a theoretical standpoint the various types of frequency errors in thermal ammeters, describes methods of calibration of current measuring instruments at radio frequencies, and furnishes some data as to the accuracy of certain commonly used instruments at frequencies up to 100 megacycles.
J.D. Wallace, A.H. Moore
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Radio Frequency Pulsewidth Modulation
IEEE Transactions on Communications, 1973The width of a train of square pulses can be varied to produce a modulated carrier at the pulse repetition frequency. When the pulse train is generated by switching (class D) transistors, highefficiency operation is possible. The efficiency of this type of amplifier can be significantly higher than that of conventional pulsewidth modulation amplifiers,
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Sensitive radio-frequency relay
Journal of the A.I.E.E., 1924The present paper has been prepared with a view of describing the theoretical properties, mechanical construction, and possible application of a new electron relay, invented and developed by Samuel Ruben, a physicist of New York. This relay has been developed to control currents as great as 5 amperes by means of extremely small operating currents of ...
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Frequency-Selective Heating at Radio Frequencies
Nature, 1950THE differential heating of the components of a heterogeneous mixture by radio-frequency fields is a well-known fact1,2, and the variation of the effect with frequency is often regarded as an important principle in various applications of radio- and micro-waves, for example, short-wave therapy and radio-heating.
Y. ASAMI, K. HIGASI, Y. OZAWA
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Requirements for Radio Frequency Identification in Healthcare
2009Radio frequency identification (RFID) is a growing technology among different industries. As a technology, it has been used since the Second World War, but just in the last decade, the information technology (IT) community and healthcare have been taking more action on studying and developing the technology.
Antti Lahtela, Marko Hassinen
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Optimized radio-frequency identification system for different warehouse shapes
Knowledge-Based Systems, 2022Biswajit Sarkar +2 more
exaly