Chapter 4: Introduction - Non-Ideal Conditions

Chapter 4 will explore the issues that make the theory of Chapters 1 and 2 more difficult: Fresnel-Zones, Obstructions, Rain Fade and more.

The previous chapters have been theory-heavy, focusing on idealized conditions. This is great for understanding the principles of how WISP equipment works, but is incomplete in the face of reality. As Carl von Clausewitz famously wrote, “no plan survives contact with the enemy.” This is just as true in radio design as it is in warfare.

This chapter will discuss the importance of the fade margin from your link budget, and how it relates to atmospheric events such as rain. It will also discuss the importance of line-of-sight, obstructions, and the often-mentioned Fresnel Zone concept.

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