Info

2.2 Initial Planning and Site Selection, 38

2.2.1 Requirements and Requirements Analyses, 38

2.2.2 Route Layout and Site Selection, 40

2.3 Path Profiles, 43

2.3.1 Determiniation of Median Value for £"-Factor, 46

2.4 Reflection Point, 48

2.5 Site Survey, 51

2.5.1 Introduction, 51

2.5.2 Information Listing, 51

2.5.3 Notes on Site Visit, 53

2.6 Path Analysis, 54

2.6.1 Objective and Scope, 54

2.6.2 Unfaded Signal Level at the Receiver, 55

2.6.3 Receiver Thermal Noise Threshold, 58

2.6.4 Calculation of IF Bandwidth and Peak Frequency Deviation, 61

2.6.5 Pre-emphasis/De-emphasis, 64

2.6.6 Calculation of Median Carrier-to-Noise Ratio (Unfaded), 67

2.6.7 Calculation of Antenna Gain, 69

2.7 Fading, Estimation of Fade Margin, and Mitigation of Fading Effects, 70

2.7.1 Discussion of LOS Microwave Fading, 70

2.7.2 Calculating Fade Margin, 71

2.7.3 Notes on Path Fading Range Estimates, 81

2.7.4 Diversity as a Means to Mitigate Fading, 82

2.8 Analysis of Noise on a FM Radiolink, 87

2.8.1 Introduction, 87

2.8.2 Sources of Noise in a Radiolink, 89

2.8.3 FM Improvement Threshold, 90

2.8.4 Noise in a Derived Voice Channel, 91

2.8.6 Antenna Feeder Distortion, 103

2.8.7 Total Noise in the Voice Channel, 107

2.8.8 Signal-to-Noise Ratio for TV Video, 107

2.9 Path Analysis Worksheet and Example, 108 2.9.1 Introduction, 108

2.9.2 Sample Worksheet, 108

2.10 Frequency Assignment, Compatibility, and Frequency Plan, 113

2.10.1 Introduction, 113

2.10.2 Frequency Planning—Channel Arrangement, 113

2.10.3 Some Typical ITU-R Channel Arrangements, 119

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