User`s guide

Radio Signal Propagation
C-1
Appendix C
This section explains and simplifies many of the terms
relating to antennas and RF (Radio Frequency) used when
dealing with an RF installation system.
The following diagram depicts a typical radio system:
Figure C-1: A Typical Radio System
A radio system transmits information to the transmitter. The
information is transmitted through an antenna that converts
the RF signal into an electromagnetic wave. The
transmission medium for electromagnetic wave propagation
is free space.