Excerpt from Characteristics of Point-to-Point Tropospheric Propagation and Siting Considerations
In planning and installing tropospheric communication systems the engineer is faced with exacting problems in selecting sites, choosing frequencies, and in determining what terminal equipment is needed to accomplish the communication requirement specified. It is important to realize the distinction between equip ment performance and system performance. The latter includes equipment performance, but it also includes the propagation characteristics of the path. Transmission loss for nearly all tropospheric paths is a variable. Good theoretical prediction theories for transmission loss are of fundamental importance....