Results 211 to 220 of about 148,569 (266)
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Proceedings of the IRE, 1935
A system is described for electronic control of the local oscillator frequency in a superheterodyne receiver for the purpose of centering the signal carrier in the intermediate-frequency band in spite of inaccuracies of manual tuning and oscillator drift.
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A system is described for electronic control of the local oscillator frequency in a superheterodyne receiver for the purpose of centering the signal carrier in the intermediate-frequency band in spite of inaccuracies of manual tuning and oscillator drift.
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Automatic frequency control via digital filtering
IEEE Transactions on Audio and Electroacoustics, 1968This paper presents a unique digital realization of an automatic frequency control (AFC) for tracking signals that are slowly drifting in frequency. The frequency discriminator consists of two stagger-tuned digital filters, whose squared outputs are differenced and averaged.
M. Ferguson, P. Mantey
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High-Frequency Phase Calibrator Featuring Variation Automatic Frequency Control
2018 XIV International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE), 2018Methods of construction of broadband phase calibrators. Evaluation of main characteristics of the suggested devices.
Aleksandr V. Nikonov, Vasiliy A. Nikonov
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Automatic Frequency Control of Magnetrons
IRE Transactions on Military Electronics, 1961A practical AFC system for both X-band and Ku-band magnetron radar transmitters has been developed. This system meets the needs of three radar systems currently in production. Frequency stabilization is accomplished by electronically controlling the magnetron load impedance. Therefore, the magnetron ``pulling figure'' is put to use. The closed loop AFC
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Numerically efficient automatic frequency control method
2009 16th International Conference on Digital Signal Processing, 2009An automatic frequency control (AFC) method intended for compensation of a measurement error of an FSK signal central frequency is proposed. The method is based on a frequency error tolerant symbol and frame timing recovery method [1]. The AFC method provides computational efficiency improvement compared to conventional DC offset estimation method.
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Automatic control of power-system frequency by machine controllers
Proceedings of the Institution of Electrical Engineers, 1968The paper assesses the performance of the frequency-control loops of the machine controllers installed in the power stations participating in the automatic-load-scheduling experiment. It first describes the role of these control loops and explains the mechanism of frequency control, and then examines in detail the stability and performance of the ...
F. Moran, D.R. Williams
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Automatic Frequency Control Systems
1967One of the problems to overcome when designing an E.S.R. spectrometer is to prevent variations in the frequency of the klystron and in the resonant frequency of the spectrometer cavity from occurring. These variations degrade the performance of the spectrometer in one way or another, and various automatic frequency control systems have been devised to ...
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Automatic frequency control of an induction furnace
1999 IEEE Africon. 5th Africon Conference in Africa (Cat. No.99CH36342), 2003Automatic frequency control enables a variable induction heating load to be driven at its resonant frequency, ensuring maximum power transfer to the load throughout the heating cycle. Analysis and experimental results of the resonance locked-loop are presented to illustrate the performance of the system.
I. Khan, J. Tapson, I. De Vries
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Automatic Frequency Control of Microwave Oscillators
Proceedings of the IRE, 1947A method for the automatic frequency control of any type of tunable microwave oscillator is described. In this method a servomechanism is used which includes a wave-guide discriminator circuit, a mercury-contact relay, a 60-cycle amplifier, and a small two-phase induction motor.
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Metrological equipment featuring variation automatic frequency control
2016 13th International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE), 2016Method of automatic frequency control via second derivative of informative parameter. Variant of construction of metrologic equipment featuring higher precision, performance and noise stability.
Aleksandr V. Nikonov, Galina V. Nikonova
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