Frequency Modulation Theory

Application to Microwave Links

1st Edition - January 1, 1961
Authors: Jacques Fagot, Philippe Magne
Editors: D. W. Fry, W. Higinbotham
Language: English
eBook ISBN:
9 7 8 - 1 - 4 8 3 2 - 2 1 8 1 - 6

Electronic and Instrumentation, Volume 11: Frequency Modulation Theory: Application to Microwave Links covers the theoretical principles of microwave beam technique. This… Read more

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Electronic and Instrumentation, Volume 11: Frequency Modulation Theory: Application to Microwave Links covers the theoretical principles of microwave beam technique. This five-chapter text particularly discusses the propagation of the waves used, frequency modulation, and noise and sundry distortions liable to arise either in the course of propagation, in the equipment, and in the methods used for the transmission of the information. Chapter 1 examines the transfer of the radio-frequency energy over a given path. This chapter describes the properties of propagation of radio waves, including metric, decimetric and centimetric, through the troposphere. Chapter 2 concerns all the general problems of frequency modulation, while chapter 3 deals with the propagation distortion, which is apparent in a variable-velocity guided transmission channel, and, which appears on an echoing path either in free space, or over a badly matched feeder. Chapter 4 discusses the complete problem of telephony and television transmissions over radio links. This chapter also considers in detail the requisite conditions for meeting the international standards. Chapter 5 deals with all the applied techniques, with an emphasis on radio link equipment. This book will be of great value to students and non-specialized and specialized engineers who wish to become familiar with microwave beam technique.

ForewordIntroduction1. Propagation — Energy Transfer 1.1 Definition of the Transmission Equivalent 1.2 Propagation of the Carrier Wave in Free Space — Calculation of the Transmission Equivalent between Aerials 1.3 Propagation in the Atmosphere and near the Ground 1.4 Atmospheric Absorption 1.5 Atmospheric Refraction 1.6 Fresnel Ellipsoid 1.7 Profile Representation 1.8 Ground Reflections 1.9 Attenuation by a Hill-Crest of the "Knife Edge" Type 1.10 Conclusions regarding the Installation of Radio Links over an Optical Path 1.11 Tropospheric Propagation beyond the Horizon References2. Distortion and Noise in Frequency Modulation 2.1 Principle of Frequency Modulation 2.2 Spectrum of a Sinusoidally Frequency-Modulated Oscillation 2.3 Non-Linear Distortions in Frequency Modulation 2.4 Analysis of Amplitude Distortion 2.5 Analysis of Phase Distortion 2.6 Application of General Network Laws for the Evaluation of Phase Distortion in Amplifiers 2.7 Phase Distortion in an Amplifier Consisting of a Series of Triplets 2.8 Noise in Frequency Modulation 2.9 Method of Direct Calculation of Non-Linear Distortion in Frequency Modulation References3. Propagation Distortion 3.1 Signal Expressed by the Fourier Integral 3.2 Localization of the Information by the Stationary Phase Principle 3.3 Phase Velocity and Group Velocity of a Traveling Wave 3.4 Wave Propagation along a Double Path 3.5 Distortion in Frequency Modulation for the Double Path Case 3.6 Transmission on a Mismatched Feeder 3.7 Frequency Modulation Distortion in a Mismatched Feeder 3.8 Direct Calculation of Frequency Modulation Distortion over a Double Path References4. Transmission of the Overall Information 4.1 General 4.2 Frequency Distribution in Carrier Current Multiplex 4.3 Problem of Levels in Carrier Current Multiplex 4.4 Application of Multiplex Signals to Frequency Modulation Radio Equipment 4.5 Formula Related to Thermal Noise 4.6 Overall Cross-Talk Power in Amplitude Modulation 4.7 Intermodulation Distribution in the Base-Band 4.8 Combination of Intermodulation in the Various Elements of a Microwave Link 4.9 the Multiplex Signal Considered as a Stationary Random Function—Application to the Calculation of the Intermodulation Spectrum 4.10 Intermodulation in Frequency Modulation Equipment 4.11 Propagation Cross-Talk 4.12 Transmission Conditions for Television Signals 4.13 Principal Technical Problems Raised by the Transmission of Television on Microwave Links References5. Equipment 5.1 Design of Radio Link Equipment 5.2 Structure of Microwave Links 5.3 Highly Linear Modulation and Demodulation — General Remarks 5.4 Frequency Modulation of the U.H.F. Band 5.5 Frequency Modulators Operating in the "Intermediate Frequency" Band 5.6 Demodulation 5.7 Amplification Technique — General Remarks 5.8 Noise Figure 5.9 Amplifier Pass-Band and Gain 5.10 Impedance Breaks between Elements of an Amplifier Chain 5.11 Phase Distortion Correction—Group Propagation Time Equalizers 5.12 Frequency Changing—Mixers 5.13 Frequency Stabilization 5.14 Filters for Hyper-Frequencies 5.15 Aerials 5.16 Ferrite Unidirectional Attenuator (Isolator) 5.17 Measurements ReferencesNotationsAbbreviationsIndex