Every wireless link lives or dies by three things: the band it runs on, the standard it follows, and the physics working against it. Pick the wrong band for the job and no amount of hardware saves you. Understand how they fit together and you can design links that hold in the field.
We walk through the RF bands in practice, Sub-1GHz telemetry through E-Band multi-gigabit backhaul, and show where each one earns its place. Then the technologies that ride on them: how cellular evolved from a single city tower to global 5G, how Wi-Fi grew from 11 Mbps to 46 Gbps, and why Wi-Fi and cellular solve fundamentally different problems under load. We close on the numbers that tell you whether a link is actually healthy, and the link physics engineers budget for every time.
Signal strength does not determine performance. Signal quality does. This chapter shows you how to tell the difference.
