(a) Assume that the range of a mobile phone is limited by its transmitter power. If a portable phone (Class III) can communicate over a distance of 5 km, what would be the maximum range for a permanently installed car phone (Class I) under the same circumstances. Assume free-space attenuation.
(b) Repeat part (a), but assume that attenuation is proportional to the cube of distance. This is more typical of a mobile environment.
(c) Examine the assumption made above. What other factors could limit communication range?