Question

Why frequency of outgoing and incoming signals different in moblies?

Answer 1

Radio frequency communications operate the same when travelling through a coaxial cable as they do through open-air.

They are just shielded from outside interference (called ingress) and leakage (called egress).

As such, signals of differing frequencies can co-exist, with each travelling in different directions.

Answer 2

Explanation:

Incoming and outgoing signals from the handset have different frequencies to avoid interference between units in adjacent or closely spaced cells. The same frequencies may be reused in cells that are sufficiently geographically separated from each other to prevent interference there between.