Circuit technique in frequency-modulated microwave links
- 1 September 1952
- journal article
- Published by Institution of Engineering and Technology (IET) in Proceedings of the IEE - Part III: Radio and Communication Engineering
- Vol. 99 (61) , 256-274
- https://doi.org/10.1049/pi-3.1952.0065
Abstract
The paper describes the circuit problems in wide-band microwave communication links and is illustrated by reference to the development of links operating at frequencies around 4 000 Mc/s for 180-channel telephony and for television.Modulating and demodulating circuits with very linear characteristics, and i.f. amplifiers with uniform time-delay are described, together with the necessary techniques required to assess their performances.The optimum design for a broad-band low-noise i.f. amplifier is shown to consist of cascaded earthed-grid triodes.Automatic-frequency-control systems, the special video problems of television, and high-level intermediate-frequency/microwave mixers are described.Keywords
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